A significant debogofication of locore.s. I havn't found any actualy
bugs, but it is a lot easier to navigate this twisted code now.
This commit is contained in:
Poul-Henning Kamp
parent
1844587c79
commit
1a0e8e31c6
@ -34,15 +34,13 @@
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* SUCH DAMAGE.
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*
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* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
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* $Id: locore.s,v 1.63 1996/03/02 19:37:38 peter Exp $
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*/
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/*
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* locore.s: FreeBSD machine support for the Intel 386
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* $Id: locore.s,v 1.64 1996/03/27 17:16:29 bde Exp $
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*
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* originally from: locore.s, by William F. Jolitz
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*
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* Substantially rewritten by David Greenman, Rod Grimes,
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* Bruce Evans, Wolfgang Solfrank, and many others.
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* Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
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* and many others.
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*/
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#include "apm.h"
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@ -112,7 +110,7 @@ tmpstk:
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.globl _boothowto,_bootdev
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.globl _cpu,_cold,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo
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.globl _cpu,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo
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.globl _cpu_high, _cpu_feature
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_cpu: .long 0 /* are we 386, 386sx, or 486 */
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@ -121,11 +119,12 @@ _cpu_high: .long 0 /* highest arg to CPUID */
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_cpu_feature: .long 0 /* features */
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_cpu_vendor: .space 20 /* CPU origin code */
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_bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */
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_cold: .long 1 /* cold till we are not */
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_atdevbase: .long 0 /* location of start of iomem in virtual */
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_atdevphys: .long 0 /* location of device mapping ptes (phys) */
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_KERNend: .long 0 /* phys addr end of kernel (just after bss) */
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physfree: .long 0 /* phys addr end of kernel (just after bss) */
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upa: .long 0 /* phys addr end of kernel (just after bss) */
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p0s: .long 0 /* phys addr end of kernel (just after bss) */
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.globl _IdlePTD
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_IdlePTD: .long 0 /* phys addr of kernel PTD */
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@ -135,36 +134,182 @@ _KPTphys: .long 0 /* phys addr of kernel page tables */
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.globl _proc0paddr
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_proc0paddr: .long 0 /* address of proc 0 address space */
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#ifdef BDE_DEBUGGER
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.globl _bdb_exists /* flag to indicate BDE debugger is available */
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_bdb_exists: .long 0
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#endif
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/*
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* System Initialization
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/**********************************************************************
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*
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* Some handy macros
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*
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*/
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.text
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#define R(foo) ((foo)-KERNBASE)
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#define ROUND2PAGE(foo) addl $NBPG-1, foo; andl $~(NBPG-1), foo
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#define ALLOCPAGES(foo) \
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movl R(physfree), %esi ; \
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movl $((foo)*NBPG), %eax ; \
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addl %esi, %eax ; \
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movl %eax, R(physfree) ; \
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movl %esi, %edi ; \
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movl $((foo)*NBPG),%ecx ; \
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xorl %eax,%eax ; \
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cld ; rep ; stosb
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/*
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* btext: beginning of text section.
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* Also the entry point (jumped to directly from the boot blocks).
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* fillkpt
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* eax = (page frame address | control | status) == pte
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* ebx = address of page table
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* ecx = how many pages to map
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*/
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#define fillkpt \
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1: movl %eax,(%ebx) ; \
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addl $NBPG,%eax ; /* increment physical address */ \
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addl $4,%ebx ; /* next pte */ \
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loop 1b ;
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.text
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/**********************************************************************
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*
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* This is where the bootblocks start us, set the ball rolling...
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*
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*/
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NON_GPROF_ENTRY(btext)
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movw $0x1234,0x472 /* warm boot */
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/* Set up a real frame, some day we will be doing returns */
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/* Tell the bios to warmboot next time */
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movw $0x1234,0x472
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/* Set up a real frame, some day we may be doing returns */
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pushl %ebp
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movl %esp, %ebp
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/* Don't trust what the BIOS gives for eflags. */
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/* Don't trust what the BIOS gives for eflags. */
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pushl $PSL_KERNEL
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popfl
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/* Don't trust what the BIOS gives for %fs and %gs. */
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mov %ds, %ax
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mov %ds, %ax /* ... or segment registers */
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mov %ax, %es
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mov %ax, %fs
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mov %ax, %gs
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call recover_bootinfo
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/* get onto a stack we know the size of */
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movl $R(tmpstk),%esp
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mov %ds, %ax
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mov %ax, %ss
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call identify_cpu
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/* clear bss */
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movl $R(_end),%ecx
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movl $R(_edata),%edi
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subl %edi,%ecx
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xorl %eax,%eax
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cld ; rep ; stosb
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#if NAPM > 0
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call _apm_setup /* ... in i386/apm/apm_setup.s */
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#endif /* NAPM */
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call create_pagetables
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/* Now enable paging */
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movl R(_IdlePTD), %eax
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movl %eax,%cr3 /* load ptd addr into mmu */
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movl %cr0,%eax /* get control word */
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orl $CR0_PE|CR0_PG,%eax /* enable paging */
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movl %eax,%cr0 /* and let's page NOW! */
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pushl $begin /* jump to high mem */
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ret
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/* now running relocated at KERNBASE where the system is linked to run */
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begin:
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/* set up bootstrap stack */
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movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */
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xorl %eax,%eax /* mark end of frames */
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movl %eax,%ebp
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movl _proc0paddr,%eax
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movl _IdlePTD, %esi
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movl %esi,PCB_CR3(%eax)
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/*
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* Prepare "first" - physical address of first available page
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* after the kernel+pdir+upages+p0stack+page tables
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*/
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movl physfree, %esi
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pushl %esi /* value of first for init386(first) */
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call _init386 /* wire 386 chip for unix operation */
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popl %esi
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.globl __ucodesel,__udatasel
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pushl $0 /* unused */
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pushl __udatasel /* ss */
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pushl $0 /* esp - filled in by execve() */
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pushl $PSL_USER /* eflags (IOPL 0, int enab) */
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pushl __ucodesel /* cs */
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pushl $0 /* eip - filled in by execve() */
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subl $(12*4),%esp /* space for rest of registers */
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pushl %esp /* call main with frame pointer */
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call _main /* autoconfiguration, mountroot etc */
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addl $(13*4),%esp /* back to a frame we can return with */
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/*
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* now we've run main() and determined what cpu-type we are, we can
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* enable write protection and alignment checking on i486 cpus and
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* above.
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*/
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#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
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cmpl $CPUCLASS_386,_cpu_class
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je 1f
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movl %cr0,%eax /* get control word */
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orl $CR0_WP|CR0_AM,%eax /* enable i486 features */
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movl %eax,%cr0 /* and do it */
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#endif
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/*
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* on return from main(), we are process 1
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* set up address space and stack so that we can 'return' to user mode
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*/
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1:
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movl __ucodesel,%eax
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movl __udatasel,%ecx
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movl %cx,%ds
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movl %cx,%es
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movl %ax,%fs /* double map cs to fs */
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movl %cx,%gs /* and ds to gs */
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iret /* goto user! */
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#define LCALL(x,y) .byte 0x9a ; .long y ; .word x
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/*
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* Signal trampoline, copied to top of user stack
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*/
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NON_GPROF_ENTRY(sigcode)
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call SIGF_HANDLER(%esp)
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lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
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/* copy at 8(%esp)) */
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pushl %eax
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pushl %eax /* junk to fake return address */
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movl $SYS_sigreturn,%eax /* sigreturn() */
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LCALL(0x7,0) /* enter kernel with args on stack */
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hlt /* never gets here */
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.align 2,0x90 /* long word text-align */
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_esigcode:
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.data
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.globl _szsigcode
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_szsigcode:
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.long _esigcode-_sigcode
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/**********************************************************************
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*
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* Recover the bootinfo passed to us from the boot program
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*
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*/
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recover_bootinfo:
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/*
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* This code is called in different ways depending on what loaded
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* and started the kernel. This is used to detect how we get the
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@ -199,7 +344,7 @@ NON_GPROF_ENTRY(btext)
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* address of 0.
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*/
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cmpl $0,4(%ebp)
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je 2f /* olddiskboot: */
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je olddiskboot
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/*
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* We have some form of return address, so this is either the
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@ -208,7 +353,7 @@ NON_GPROF_ENTRY(btext)
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* we are being booted by the new unifrom boot code.
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*/
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cmpl $0,24(%ebp)
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je 1f /* newboot: */
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je newboot
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/*
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* Seems we have been loaded by the old diskless boot code, we
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@ -222,12 +367,13 @@ NON_GPROF_ENTRY(btext)
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* Lets check the bootinfo version, and if we do not understand
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* it we return to the loader with a status of 1 to indicate this error
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*/
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1: /* newboot: */
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newboot:
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movl 28(%ebp),%ebx /* &bootinfo.version */
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movl BI_VERSION(%ebx),%eax
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cmpl $1,%eax /* We only understand version 1 */
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je 1f
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movl $1,%eax /* Return status */
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add $4, %esp /* pop recover_bootinfo's retaddr */
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leave
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ret
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@ -298,18 +444,21 @@ got_common_bi_size:
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* Note that the newer boot code just falls into here to pick
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* up howto and bootdev, cyloffset and esym are no longer used
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*/
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2: /* olddiskboot: */
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olddiskboot:
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movl 8(%ebp),%eax
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movl %eax,_boothowto-KERNBASE
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movl 12(%ebp),%eax
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movl %eax,_bootdev-KERNBASE
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#if NAPM > 0
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/* call APM BIOS driver setup (i386/apm/apm_setup.s) */
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call _apm_setup
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#endif /* NAPM */
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ret
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/* Find out our CPU type. */
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/**********************************************************************
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*
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* Identify the CPU and initialize anything special about it
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*
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*/
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identify_cpu:
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/* Try to toggle alignment check flag; does not exist on 386. */
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pushfl
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@ -391,9 +540,9 @@ got_common_bi_size:
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andb $~CCR0_NC0,%al
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#ifndef CYRIX_CACHE_REALLY_WORKS
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orb $(CCR0_NC1|CCR0_BARB),%al
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#else
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#else /* !CYRIX_CACHE_REALLY_WORKS */
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orb $CCR0_NC1,%al
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#endif
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#endif /* CYRIX_CACHE_REALLY_WORKS */
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movb %al,%ah
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movb $CCR0,%al
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outb %al,$0x22
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@ -458,351 +607,152 @@ got_common_bi_size:
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/* Greater than Pentium...call it a Pentium Pro */
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movl $CPU_686,_cpu-KERNBASE
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3:
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/*
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* Finished with old stack; load new %esp now instead of later so
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* we can trace this code without having to worry about the trace
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* trap clobbering the memory test or the zeroing of the bss+bootstrap
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* page tables.
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*
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* XXX - wdboot clears the bss after testing that this is safe.
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* This is too wasteful - memory below 640K is scarce. The boot
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* program should check:
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* text+data <= &stack_variable - more_space_for_stack
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* text+data+bss+pad+space_for_page_tables <= end_of_memory
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* Oops, the gdt is in the carcass of the boot program so clearing
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* the rest of memory is still not possible.
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*/
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movl $tmpstk-KERNBASE,%esp /* bootstrap stack end location */
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/*
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* Virtual address space of kernel:
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*
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* text | data | bss | [syms] | page dir | proc0 kernel stack | usr stk map | Sysmap
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* pages: 1 UPAGES (2) 1 NKPT (7)
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*/
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/* find end of kernel image */
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movl $_end-KERNBASE,%ecx
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addl $NBPG-1,%ecx /* page align up */
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andl $~(NBPG-1),%ecx
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movl %ecx,%esi /* esi = start of free memory */
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movl %ecx,_KERNend-KERNBASE /* save end of kernel */
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/* clear bss */
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movl $_edata-KERNBASE,%edi
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subl %edi,%ecx /* get amount to clear */
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xorl %eax,%eax /* specify zero fill */
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cld
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rep
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stosb
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#ifdef DDB
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/* include symbols in "kernel image" if they are loaded */
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movl _bootinfo+BI_ESYMTAB-KERNBASE,%edi
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testl %edi,%edi
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je over_symalloc
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addl $NBPG-1,%edi
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andl $~(NBPG-1),%edi
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movl %edi,%esi
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movl %esi,_KERNend-KERNBASE
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movl $KERNBASE,%edi
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addl %edi,_bootinfo+BI_SYMTAB-KERNBASE
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addl %edi,_bootinfo+BI_ESYMTAB-KERNBASE
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over_symalloc:
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#endif
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/*
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* The value in esi is both the end of the kernel bss and a pointer to
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* the kernel page directory, and is used by the rest of locore to build
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* the tables.
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* esi + 1(page dir) + 2(UPAGES) + 1(p0stack) + NKPT(number of kernel
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* page table pages) is then passed on the stack to init386(first) as
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* the value first. esi should ALWAYS be page aligned!!
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*/
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movl %esi,%ecx /* Get current first availiable address */
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/* clear pagetables, page directory, stack, etc... */
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movl %esi,%edi /* base (page directory) */
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movl $((1+UPAGES+1+NKPT)*NBPG),%ecx /* amount to clear */
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xorl %eax,%eax /* specify zero fill */
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cld
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rep
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stosb
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/* physical address of Idle proc/kernel page directory */
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movl %esi,_IdlePTD-KERNBASE
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/*
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* fillkpt
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* eax = (page frame address | control | status) == pte
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* ebx = address of page table
|
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* ecx = how many pages to map
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*/
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#define fillkpt \
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1: movl %eax,(%ebx) ; \
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addl $NBPG,%eax ; /* increment physical address */ \
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addl $4,%ebx ; /* next pte */ \
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loop 1b ;
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/*
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* Map Kernel
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*
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* First step - build page tables
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||||
*/
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||||
#if defined (KGDB) || defined (BDE_DEBUGGER)
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movl _KERNend-KERNBASE,%ecx /* this much memory, */
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shrl $PGSHIFT,%ecx /* for this many PTEs */
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#ifdef BDE_DEBUGGER
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cmpl $0xa0,%ecx /* XXX - cover debugger pages */
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jae 1f
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movl $0xa0,%ecx
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1:
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||||
#endif /* BDE_DEBUGGER */
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movl $PG_V|PG_KW,%eax /* kernel R/W, valid */
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lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
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movl %ebx,_KPTphys-KERNBASE /* save in global */
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fillkpt
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#else /* !KGDB && !BDE_DEBUGGER */
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/* write protect kernel text (doesn't do a thing for 386's - only 486's) */
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movl $_etext-KERNBASE,%ecx /* get size of text */
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addl $NBPG-1,%ecx /* round up to page */
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shrl $PGSHIFT,%ecx /* for this many PTEs */
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movl $PG_V|PG_KR,%eax /* specify read only */
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#if 0
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movl $_etext,%ecx /* get size of text */
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subl $_btext,%ecx
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addl $NBPG-1,%ecx /* round up to page */
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shrl $PGSHIFT,%ecx /* for this many PTEs */
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movl $_btext-KERNBASE,%eax /* get offset to physical memory */
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orl $PG_V|PG_KR,%eax /* specify read only */
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#endif
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lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
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movl %ebx,_KPTphys-KERNBASE /* save in global */
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fillkpt
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/* data and bss are r/w */
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andl $PG_FRAME,%eax /* strip to just addr of bss */
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movl _KERNend-KERNBASE,%ecx /* calculate size */
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subl %eax,%ecx
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shrl $PGSHIFT,%ecx
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orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
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fillkpt
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||||
#endif /* KGDB || BDE_DEBUGGER */
|
||||
|
||||
/* now initialize the page dir, upages, and p0stack PT */
|
||||
|
||||
movl $(1+UPAGES+1),%ecx /* number of PTEs */
|
||||
movl %esi,%eax /* phys address of PTD */
|
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andl $PG_FRAME,%eax /* convert to PFN, should be a NOP */
|
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orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
movl %esi,%ebx /* calculate pte offset to ptd */
|
||||
shrl $PGSHIFT-2,%ebx
|
||||
addl %esi,%ebx /* address of page directory */
|
||||
addl $((1+UPAGES+1)*NBPG),%ebx /* offset to kernel page tables */
|
||||
fillkpt
|
||||
|
||||
/* map I/O memory map */
|
||||
|
||||
movl _KPTphys-KERNBASE,%ebx /* base of kernel page tables */
|
||||
lea (0xa0 * PTESIZE)(%ebx),%ebx /* hardwire ISA hole at KERNBASE + 0xa0000 */
|
||||
movl $0x100-0xa0,%ecx /* for this many pte s, */
|
||||
movl $(0xa0000|PG_V|PG_KW|PG_N),%eax /* valid, kernel read/write, non-cacheable */
|
||||
movl %ebx,_atdevphys-KERNBASE /* save phys addr of ptes */
|
||||
fillkpt
|
||||
|
||||
/* map proc 0's kernel stack into user page table page */
|
||||
|
||||
movl $UPAGES,%ecx /* for this many pte s, */
|
||||
lea (1*NBPG)(%esi),%eax /* physical address in proc 0 */
|
||||
lea (KERNBASE)(%eax),%edx /* change into virtual addr */
|
||||
movl %edx,_proc0paddr-KERNBASE /* save VA for proc 0 init */
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
lea ((1+UPAGES)*NBPG)(%esi),%ebx /* addr of stack page table in proc 0 */
|
||||
addl $(KSTKPTEOFF * PTESIZE),%ebx /* offset to kernel stack PTE */
|
||||
fillkpt
|
||||
|
||||
/*
|
||||
* Initialize kernel page table directory
|
||||
*/
|
||||
/* install a pde for temporary double map of bottom of VA */
|
||||
movl _KPTphys-KERNBASE,%eax
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
movl %eax,(%esi) /* which is where temp maps! */
|
||||
|
||||
/* initialize kernel pde's */
|
||||
movl $(NKPT),%ecx /* for this many PDEs */
|
||||
lea (KPTDI*PDESIZE)(%esi),%ebx /* offset of pde for kernel */
|
||||
fillkpt
|
||||
|
||||
/* install a pde recursively mapping page directory as a page table! */
|
||||
movl %esi,%eax /* phys address of ptd in proc 0 */
|
||||
orl $PG_V|PG_KW,%eax /* pde entry is valid */
|
||||
movl %eax,PTDPTDI*PDESIZE(%esi) /* which is where PTmap maps! */
|
||||
|
||||
/* install a pde to map kernel stack for proc 0 */
|
||||
lea ((1+UPAGES)*NBPG)(%esi),%eax /* physical address of pt in proc 0 */
|
||||
orl $PG_V|PG_KW,%eax /* pde entry is valid */
|
||||
movl %eax,KSTKPTDI*PDESIZE(%esi) /* which is where kernel stack maps! */
|
||||
|
||||
#ifdef BDE_DEBUGGER
|
||||
/* copy and convert stuff from old gdt and idt for debugger */
|
||||
|
||||
cmpl $0x0375c339,0x96104 /* XXX - debugger signature */
|
||||
jne 1f
|
||||
movb $1,_bdb_exists-KERNBASE
|
||||
1:
|
||||
pushal
|
||||
subl $2*6,%esp
|
||||
|
||||
sgdt (%esp)
|
||||
movl 2(%esp),%esi /* base address of current gdt */
|
||||
movl $_gdt-KERNBASE,%edi
|
||||
movl %edi,2(%esp)
|
||||
movl $8*18/4,%ecx
|
||||
cld
|
||||
rep /* copy gdt */
|
||||
movsl
|
||||
movl $_gdt-KERNBASE,-8+2(%edi) /* adjust gdt self-ptr */
|
||||
movb $0x92,-8+5(%edi)
|
||||
|
||||
sidt 6(%esp)
|
||||
movl 6+2(%esp),%esi /* base address of current idt */
|
||||
movl 8+4(%esi),%eax /* convert dbg descriptor to ... */
|
||||
movw 8(%esi),%ax
|
||||
movl %eax,bdb_dbg_ljmp+1-KERNBASE /* ... immediate offset ... */
|
||||
movl 8+2(%esi),%eax
|
||||
movw %ax,bdb_dbg_ljmp+5-KERNBASE /* ... and selector for ljmp */
|
||||
movl 24+4(%esi),%eax /* same for bpt descriptor */
|
||||
movw 24(%esi),%ax
|
||||
movl %eax,bdb_bpt_ljmp+1-KERNBASE
|
||||
movl 24+2(%esi),%eax
|
||||
movw %ax,bdb_bpt_ljmp+5-KERNBASE
|
||||
|
||||
movl $_idt-KERNBASE,%edi
|
||||
movl %edi,6+2(%esp)
|
||||
movl $8*4/4,%ecx
|
||||
cld
|
||||
rep /* copy idt */
|
||||
movsl
|
||||
|
||||
lgdt (%esp)
|
||||
lidt 6(%esp)
|
||||
|
||||
addl $2*6,%esp
|
||||
popal
|
||||
#endif /* BDE_DEBUGGER */
|
||||
|
||||
/* load base of page directory and enable mapping */
|
||||
movl %esi,%eax /* phys address of ptd in proc 0 */
|
||||
movl %eax,%cr3 /* load ptd addr into mmu */
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_PE|CR0_PG,%eax /* enable paging */
|
||||
movl %eax,%cr0 /* and let's page NOW! */
|
||||
|
||||
pushl $begin /* jump to high mem */
|
||||
ret
|
||||
|
||||
begin: /* now running relocated at KERNBASE where the system is linked to run */
|
||||
movl _atdevphys,%edx /* get pte PA */
|
||||
subl _KPTphys,%edx /* remove base of ptes, now have phys offset */
|
||||
shll $PGSHIFT-2,%edx /* corresponding to virt offset */
|
||||
addl $KERNBASE,%edx /* add virtual base */
|
||||
movl %edx,_atdevbase
|
||||
|
||||
/* set up bootstrap stack */
|
||||
movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */
|
||||
xorl %eax,%eax /* mark end of frames */
|
||||
movl %eax,%ebp
|
||||
movl _proc0paddr,%eax
|
||||
movl %esi,PCB_CR3(%eax)
|
||||
|
||||
#ifdef BDE_DEBUGGER
|
||||
/* relocate debugger gdt entries */
|
||||
|
||||
movl $_gdt+8*9,%eax /* adjust slots 9-17 */
|
||||
movl $9,%ecx
|
||||
reloc_gdt:
|
||||
movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */
|
||||
addl $8,%eax /* now KERNBASE>>24 */
|
||||
loop reloc_gdt
|
||||
|
||||
cmpl $0,_bdb_exists
|
||||
je 1f
|
||||
int $3
|
||||
1:
|
||||
#endif /* BDE_DEBUGGER */
|
||||
|
||||
/*
|
||||
* Prepare "first" - physical address of first available page
|
||||
* after the kernel+pdir+upages+p0stack+page tables
|
||||
*/
|
||||
lea ((1+UPAGES+1+NKPT)*NBPG)(%esi),%esi
|
||||
|
||||
pushl %esi /* value of first for init386(first) */
|
||||
call _init386 /* wire 386 chip for unix operation */
|
||||
popl %esi
|
||||
|
||||
.globl __ucodesel,__udatasel
|
||||
|
||||
pushl $0 /* unused */
|
||||
pushl __udatasel /* ss */
|
||||
pushl $0 /* esp - filled in by execve() */
|
||||
pushl $PSL_USER /* eflags (IOPL 0, int enab) */
|
||||
pushl __ucodesel /* cs */
|
||||
pushl $0 /* eip - filled in by execve() */
|
||||
subl $(12*4),%esp /* space for rest of registers */
|
||||
|
||||
pushl %esp /* call main with frame pointer */
|
||||
call _main /* autoconfiguration, mountroot etc */
|
||||
|
||||
addl $(13*4),%esp /* back to a frame we can return with */
|
||||
|
||||
/*
|
||||
* now we've run main() and determined what cpu-type we are, we can
|
||||
* enable write protection and alignment checking on i486 cpus and
|
||||
* above.
|
||||
*/
|
||||
#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
|
||||
cmpl $CPUCLASS_386,_cpu_class
|
||||
je 1f
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_WP|CR0_AM,%eax /* enable i486 features */
|
||||
movl %eax,%cr0 /* and do it */
|
||||
#endif
|
||||
/*
|
||||
* on return from main(), we are process 1
|
||||
* set up address space and stack so that we can 'return' to user mode
|
||||
*/
|
||||
1:
|
||||
movl __ucodesel,%eax
|
||||
movl __udatasel,%ecx
|
||||
|
||||
movl %cx,%ds
|
||||
movl %cx,%es
|
||||
movl %ax,%fs /* double map cs to fs */
|
||||
movl %cx,%gs /* and ds to gs */
|
||||
iret /* goto user! */
|
||||
|
||||
#define LCALL(x,y) .byte 0x9a ; .long y ; .word x
|
||||
|
||||
/*
|
||||
* Signal trampoline, copied to top of user stack
|
||||
/**********************************************************************
|
||||
*
|
||||
* Create the first page directory and it's page tables
|
||||
*
|
||||
*/
|
||||
NON_GPROF_ENTRY(sigcode)
|
||||
call SIGF_HANDLER(%esp)
|
||||
lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
|
||||
/* copy at 8(%esp)) */
|
||||
pushl %eax
|
||||
pushl %eax /* junk to fake return address */
|
||||
movl $SYS_sigreturn,%eax /* sigreturn() */
|
||||
LCALL(0x7,0) /* enter kernel with args on stack */
|
||||
hlt /* never gets here */
|
||||
.align 2,0x90 /* long word text-align */
|
||||
_esigcode:
|
||||
|
||||
.data
|
||||
.globl _szsigcode
|
||||
_szsigcode:
|
||||
.long _esigcode-_sigcode
|
||||
create_pagetables:
|
||||
|
||||
/* find end of kernel image */
|
||||
movl $R(_end),%esi
|
||||
|
||||
/* include symbols in "kernel image" if they are loaded and useful */
|
||||
#ifdef DDB
|
||||
movl R(_bootinfo+BI_ESYMTAB),%edi
|
||||
testl %edi,%edi
|
||||
je 1f
|
||||
movl %edi,%esi
|
||||
movl $KERNBASE,%edi
|
||||
addl %edi,R(_bootinfo+BI_SYMTAB)
|
||||
addl %edi,R(_bootinfo+BI_ESYMTAB)
|
||||
1:
|
||||
#endif
|
||||
|
||||
ROUND2PAGE(%esi)
|
||||
movl %esi,R(_KERNend) /* save end of kernel */
|
||||
movl %esi,R(physfree) /* save end of kernel */
|
||||
|
||||
/* Allocate Kernel Page Tables */
|
||||
ALLOCPAGES(NKPT)
|
||||
movl %esi,R(_KPTphys)
|
||||
|
||||
/* Allocate Page Table Directory */
|
||||
ALLOCPAGES(1)
|
||||
movl %esi,R(_IdlePTD)
|
||||
|
||||
/* Allocate UPAGES */
|
||||
ALLOCPAGES(UPAGES)
|
||||
movl %esi,R(upa);
|
||||
addl $KERNBASE, %esi
|
||||
movl %esi, R(_proc0paddr)
|
||||
|
||||
/* Allocate P0 Stack */
|
||||
ALLOCPAGES(1)
|
||||
movl %esi,R(p0s);
|
||||
|
||||
/* Map read-only from zero to the end of the kernel text section */
|
||||
movl R(_KPTphys), %esi
|
||||
movl $R(_etext),%ecx
|
||||
addl $NBPG-1,%ecx
|
||||
shrl $PGSHIFT,%ecx
|
||||
movl $PG_V|PG_KR,%eax
|
||||
movl %esi, %ebx
|
||||
fillkpt
|
||||
|
||||
/* Map read-write, data, bss and symbols */
|
||||
andl $PG_FRAME,%eax
|
||||
movl R(_KERNend),%ecx
|
||||
subl %eax,%ecx
|
||||
shrl $PGSHIFT,%ecx
|
||||
orl $PG_V|PG_KW,%eax
|
||||
fillkpt
|
||||
|
||||
/* Map PD */
|
||||
movl R(_IdlePTD), %eax
|
||||
movl $1, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* Map Proc 0 kernel stack */
|
||||
movl R(p0s), %eax
|
||||
movl $1, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* ... also in user page table page */
|
||||
movl R(p0s), %eax
|
||||
movl $1, %ecx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl R(_KPTphys), %ebx
|
||||
addl $(KSTKPTEOFF * PTESIZE), %ebx
|
||||
fillkpt
|
||||
|
||||
/* Map UPAGES */
|
||||
movl R(upa), %eax
|
||||
movl $UPAGES, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* ... also in user page table page */
|
||||
movl R(upa), %eax
|
||||
movl $UPAGES, %ecx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl R(p0s), %ebx
|
||||
addl $(KSTKPTEOFF * PTESIZE), %ebx
|
||||
fillkpt
|
||||
|
||||
/* and a pde entry too */
|
||||
movl R(p0s), %eax
|
||||
movl R(_IdlePTD), %esi
|
||||
orl $PG_V|PG_KW,%eax
|
||||
movl %eax,KSTKPTDI*PDESIZE(%esi)
|
||||
|
||||
/* Map ISA hole */
|
||||
#define ISA_HOLE_START 0xa0000
|
||||
#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
|
||||
movl $ISA_HOLE_LENGTH>>PGSHIFT, %ecx
|
||||
movl ISA_HOLE_START, %eax
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW|PG_N, %eax
|
||||
fillkpt
|
||||
movl ISA_HOLE_START, %eax
|
||||
addl $KERNBASE, %eax
|
||||
movl %eax, R(_atdevbase)
|
||||
|
||||
/* install a pde for temporary double map of bottom of VA */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl R(_KPTphys), %eax
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl %eax, (%esi)
|
||||
|
||||
/* install pde's for pt's */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl R(_KPTphys), %eax
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl $(NKPT), %ecx
|
||||
lea (KPTDI*PDESIZE)(%esi), %ebx
|
||||
fillkpt
|
||||
|
||||
/* install a pde recursively mapping page directory as a page table */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl %esi,%eax
|
||||
orl $PG_V|PG_KW,%eax
|
||||
movl %eax,PTDPTDI*PDESIZE(%esi)
|
||||
|
||||
ret
|
||||
|
||||
@ -34,15 +34,13 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
|
||||
* $Id: locore.s,v 1.63 1996/03/02 19:37:38 peter Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
* locore.s: FreeBSD machine support for the Intel 386
|
||||
* $Id: locore.s,v 1.64 1996/03/27 17:16:29 bde Exp $
|
||||
*
|
||||
* originally from: locore.s, by William F. Jolitz
|
||||
*
|
||||
* Substantially rewritten by David Greenman, Rod Grimes,
|
||||
* Bruce Evans, Wolfgang Solfrank, and many others.
|
||||
* Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
|
||||
* and many others.
|
||||
*/
|
||||
|
||||
#include "apm.h"
|
||||
@ -112,7 +110,7 @@ tmpstk:
|
||||
|
||||
.globl _boothowto,_bootdev
|
||||
|
||||
.globl _cpu,_cold,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo
|
||||
.globl _cpu,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo
|
||||
.globl _cpu_high, _cpu_feature
|
||||
|
||||
_cpu: .long 0 /* are we 386, 386sx, or 486 */
|
||||
@ -121,11 +119,12 @@ _cpu_high: .long 0 /* highest arg to CPUID */
|
||||
_cpu_feature: .long 0 /* features */
|
||||
_cpu_vendor: .space 20 /* CPU origin code */
|
||||
_bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */
|
||||
_cold: .long 1 /* cold till we are not */
|
||||
_atdevbase: .long 0 /* location of start of iomem in virtual */
|
||||
_atdevphys: .long 0 /* location of device mapping ptes (phys) */
|
||||
|
||||
_KERNend: .long 0 /* phys addr end of kernel (just after bss) */
|
||||
physfree: .long 0 /* phys addr end of kernel (just after bss) */
|
||||
upa: .long 0 /* phys addr end of kernel (just after bss) */
|
||||
p0s: .long 0 /* phys addr end of kernel (just after bss) */
|
||||
|
||||
.globl _IdlePTD
|
||||
_IdlePTD: .long 0 /* phys addr of kernel PTD */
|
||||
@ -135,36 +134,182 @@ _KPTphys: .long 0 /* phys addr of kernel page tables */
|
||||
.globl _proc0paddr
|
||||
_proc0paddr: .long 0 /* address of proc 0 address space */
|
||||
|
||||
#ifdef BDE_DEBUGGER
|
||||
.globl _bdb_exists /* flag to indicate BDE debugger is available */
|
||||
_bdb_exists: .long 0
|
||||
#endif
|
||||
|
||||
/*
|
||||
* System Initialization
|
||||
/**********************************************************************
|
||||
*
|
||||
* Some handy macros
|
||||
*
|
||||
*/
|
||||
.text
|
||||
|
||||
#define R(foo) ((foo)-KERNBASE)
|
||||
|
||||
#define ROUND2PAGE(foo) addl $NBPG-1, foo; andl $~(NBPG-1), foo
|
||||
|
||||
#define ALLOCPAGES(foo) \
|
||||
movl R(physfree), %esi ; \
|
||||
movl $((foo)*NBPG), %eax ; \
|
||||
addl %esi, %eax ; \
|
||||
movl %eax, R(physfree) ; \
|
||||
movl %esi, %edi ; \
|
||||
movl $((foo)*NBPG),%ecx ; \
|
||||
xorl %eax,%eax ; \
|
||||
cld ; rep ; stosb
|
||||
|
||||
/*
|
||||
* btext: beginning of text section.
|
||||
* Also the entry point (jumped to directly from the boot blocks).
|
||||
* fillkpt
|
||||
* eax = (page frame address | control | status) == pte
|
||||
* ebx = address of page table
|
||||
* ecx = how many pages to map
|
||||
*/
|
||||
#define fillkpt \
|
||||
1: movl %eax,(%ebx) ; \
|
||||
addl $NBPG,%eax ; /* increment physical address */ \
|
||||
addl $4,%ebx ; /* next pte */ \
|
||||
loop 1b ;
|
||||
|
||||
.text
|
||||
/**********************************************************************
|
||||
*
|
||||
* This is where the bootblocks start us, set the ball rolling...
|
||||
*
|
||||
*/
|
||||
NON_GPROF_ENTRY(btext)
|
||||
movw $0x1234,0x472 /* warm boot */
|
||||
|
||||
/* Set up a real frame, some day we will be doing returns */
|
||||
/* Tell the bios to warmboot next time */
|
||||
movw $0x1234,0x472
|
||||
|
||||
/* Set up a real frame, some day we may be doing returns */
|
||||
pushl %ebp
|
||||
movl %esp, %ebp
|
||||
|
||||
/* Don't trust what the BIOS gives for eflags. */
|
||||
/* Don't trust what the BIOS gives for eflags. */
|
||||
pushl $PSL_KERNEL
|
||||
popfl
|
||||
|
||||
/* Don't trust what the BIOS gives for %fs and %gs. */
|
||||
mov %ds, %ax
|
||||
mov %ds, %ax /* ... or segment registers */
|
||||
mov %ax, %es
|
||||
mov %ax, %fs
|
||||
mov %ax, %gs
|
||||
|
||||
call recover_bootinfo
|
||||
|
||||
/* get onto a stack we know the size of */
|
||||
movl $R(tmpstk),%esp
|
||||
mov %ds, %ax
|
||||
mov %ax, %ss
|
||||
|
||||
call identify_cpu
|
||||
|
||||
/* clear bss */
|
||||
movl $R(_end),%ecx
|
||||
movl $R(_edata),%edi
|
||||
subl %edi,%ecx
|
||||
xorl %eax,%eax
|
||||
cld ; rep ; stosb
|
||||
|
||||
#if NAPM > 0
|
||||
call _apm_setup /* ... in i386/apm/apm_setup.s */
|
||||
#endif /* NAPM */
|
||||
|
||||
call create_pagetables
|
||||
|
||||
/* Now enable paging */
|
||||
movl R(_IdlePTD), %eax
|
||||
movl %eax,%cr3 /* load ptd addr into mmu */
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_PE|CR0_PG,%eax /* enable paging */
|
||||
movl %eax,%cr0 /* and let's page NOW! */
|
||||
|
||||
pushl $begin /* jump to high mem */
|
||||
ret
|
||||
|
||||
/* now running relocated at KERNBASE where the system is linked to run */
|
||||
begin:
|
||||
/* set up bootstrap stack */
|
||||
movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */
|
||||
xorl %eax,%eax /* mark end of frames */
|
||||
movl %eax,%ebp
|
||||
movl _proc0paddr,%eax
|
||||
movl _IdlePTD, %esi
|
||||
movl %esi,PCB_CR3(%eax)
|
||||
|
||||
/*
|
||||
* Prepare "first" - physical address of first available page
|
||||
* after the kernel+pdir+upages+p0stack+page tables
|
||||
*/
|
||||
movl physfree, %esi
|
||||
pushl %esi /* value of first for init386(first) */
|
||||
call _init386 /* wire 386 chip for unix operation */
|
||||
popl %esi
|
||||
|
||||
.globl __ucodesel,__udatasel
|
||||
|
||||
pushl $0 /* unused */
|
||||
pushl __udatasel /* ss */
|
||||
pushl $0 /* esp - filled in by execve() */
|
||||
pushl $PSL_USER /* eflags (IOPL 0, int enab) */
|
||||
pushl __ucodesel /* cs */
|
||||
pushl $0 /* eip - filled in by execve() */
|
||||
subl $(12*4),%esp /* space for rest of registers */
|
||||
|
||||
pushl %esp /* call main with frame pointer */
|
||||
call _main /* autoconfiguration, mountroot etc */
|
||||
|
||||
addl $(13*4),%esp /* back to a frame we can return with */
|
||||
|
||||
/*
|
||||
* now we've run main() and determined what cpu-type we are, we can
|
||||
* enable write protection and alignment checking on i486 cpus and
|
||||
* above.
|
||||
*/
|
||||
#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
|
||||
cmpl $CPUCLASS_386,_cpu_class
|
||||
je 1f
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_WP|CR0_AM,%eax /* enable i486 features */
|
||||
movl %eax,%cr0 /* and do it */
|
||||
#endif
|
||||
/*
|
||||
* on return from main(), we are process 1
|
||||
* set up address space and stack so that we can 'return' to user mode
|
||||
*/
|
||||
1:
|
||||
movl __ucodesel,%eax
|
||||
movl __udatasel,%ecx
|
||||
|
||||
movl %cx,%ds
|
||||
movl %cx,%es
|
||||
movl %ax,%fs /* double map cs to fs */
|
||||
movl %cx,%gs /* and ds to gs */
|
||||
iret /* goto user! */
|
||||
|
||||
#define LCALL(x,y) .byte 0x9a ; .long y ; .word x
|
||||
|
||||
/*
|
||||
* Signal trampoline, copied to top of user stack
|
||||
*/
|
||||
NON_GPROF_ENTRY(sigcode)
|
||||
call SIGF_HANDLER(%esp)
|
||||
lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
|
||||
/* copy at 8(%esp)) */
|
||||
pushl %eax
|
||||
pushl %eax /* junk to fake return address */
|
||||
movl $SYS_sigreturn,%eax /* sigreturn() */
|
||||
LCALL(0x7,0) /* enter kernel with args on stack */
|
||||
hlt /* never gets here */
|
||||
.align 2,0x90 /* long word text-align */
|
||||
_esigcode:
|
||||
|
||||
.data
|
||||
.globl _szsigcode
|
||||
_szsigcode:
|
||||
.long _esigcode-_sigcode
|
||||
|
||||
/**********************************************************************
|
||||
*
|
||||
* Recover the bootinfo passed to us from the boot program
|
||||
*
|
||||
*/
|
||||
recover_bootinfo:
|
||||
/*
|
||||
* This code is called in different ways depending on what loaded
|
||||
* and started the kernel. This is used to detect how we get the
|
||||
@ -199,7 +344,7 @@ NON_GPROF_ENTRY(btext)
|
||||
* address of 0.
|
||||
*/
|
||||
cmpl $0,4(%ebp)
|
||||
je 2f /* olddiskboot: */
|
||||
je olddiskboot
|
||||
|
||||
/*
|
||||
* We have some form of return address, so this is either the
|
||||
@ -208,7 +353,7 @@ NON_GPROF_ENTRY(btext)
|
||||
* we are being booted by the new unifrom boot code.
|
||||
*/
|
||||
cmpl $0,24(%ebp)
|
||||
je 1f /* newboot: */
|
||||
je newboot
|
||||
|
||||
/*
|
||||
* Seems we have been loaded by the old diskless boot code, we
|
||||
@ -222,12 +367,13 @@ NON_GPROF_ENTRY(btext)
|
||||
* Lets check the bootinfo version, and if we do not understand
|
||||
* it we return to the loader with a status of 1 to indicate this error
|
||||
*/
|
||||
1: /* newboot: */
|
||||
newboot:
|
||||
movl 28(%ebp),%ebx /* &bootinfo.version */
|
||||
movl BI_VERSION(%ebx),%eax
|
||||
cmpl $1,%eax /* We only understand version 1 */
|
||||
je 1f
|
||||
movl $1,%eax /* Return status */
|
||||
add $4, %esp /* pop recover_bootinfo's retaddr */
|
||||
leave
|
||||
ret
|
||||
|
||||
@ -298,18 +444,21 @@ got_common_bi_size:
|
||||
* Note that the newer boot code just falls into here to pick
|
||||
* up howto and bootdev, cyloffset and esym are no longer used
|
||||
*/
|
||||
2: /* olddiskboot: */
|
||||
olddiskboot:
|
||||
movl 8(%ebp),%eax
|
||||
movl %eax,_boothowto-KERNBASE
|
||||
movl 12(%ebp),%eax
|
||||
movl %eax,_bootdev-KERNBASE
|
||||
|
||||
#if NAPM > 0
|
||||
/* call APM BIOS driver setup (i386/apm/apm_setup.s) */
|
||||
call _apm_setup
|
||||
#endif /* NAPM */
|
||||
ret
|
||||
|
||||
/* Find out our CPU type. */
|
||||
|
||||
/**********************************************************************
|
||||
*
|
||||
* Identify the CPU and initialize anything special about it
|
||||
*
|
||||
*/
|
||||
identify_cpu:
|
||||
|
||||
/* Try to toggle alignment check flag; does not exist on 386. */
|
||||
pushfl
|
||||
@ -391,9 +540,9 @@ got_common_bi_size:
|
||||
andb $~CCR0_NC0,%al
|
||||
#ifndef CYRIX_CACHE_REALLY_WORKS
|
||||
orb $(CCR0_NC1|CCR0_BARB),%al
|
||||
#else
|
||||
#else /* !CYRIX_CACHE_REALLY_WORKS */
|
||||
orb $CCR0_NC1,%al
|
||||
#endif
|
||||
#endif /* CYRIX_CACHE_REALLY_WORKS */
|
||||
movb %al,%ah
|
||||
movb $CCR0,%al
|
||||
outb %al,$0x22
|
||||
@ -458,351 +607,152 @@ got_common_bi_size:
|
||||
/* Greater than Pentium...call it a Pentium Pro */
|
||||
movl $CPU_686,_cpu-KERNBASE
|
||||
3:
|
||||
|
||||
/*
|
||||
* Finished with old stack; load new %esp now instead of later so
|
||||
* we can trace this code without having to worry about the trace
|
||||
* trap clobbering the memory test or the zeroing of the bss+bootstrap
|
||||
* page tables.
|
||||
*
|
||||
* XXX - wdboot clears the bss after testing that this is safe.
|
||||
* This is too wasteful - memory below 640K is scarce. The boot
|
||||
* program should check:
|
||||
* text+data <= &stack_variable - more_space_for_stack
|
||||
* text+data+bss+pad+space_for_page_tables <= end_of_memory
|
||||
* Oops, the gdt is in the carcass of the boot program so clearing
|
||||
* the rest of memory is still not possible.
|
||||
*/
|
||||
movl $tmpstk-KERNBASE,%esp /* bootstrap stack end location */
|
||||
|
||||
/*
|
||||
* Virtual address space of kernel:
|
||||
*
|
||||
* text | data | bss | [syms] | page dir | proc0 kernel stack | usr stk map | Sysmap
|
||||
* pages: 1 UPAGES (2) 1 NKPT (7)
|
||||
*/
|
||||
|
||||
/* find end of kernel image */
|
||||
movl $_end-KERNBASE,%ecx
|
||||
addl $NBPG-1,%ecx /* page align up */
|
||||
andl $~(NBPG-1),%ecx
|
||||
movl %ecx,%esi /* esi = start of free memory */
|
||||
movl %ecx,_KERNend-KERNBASE /* save end of kernel */
|
||||
|
||||
/* clear bss */
|
||||
movl $_edata-KERNBASE,%edi
|
||||
subl %edi,%ecx /* get amount to clear */
|
||||
xorl %eax,%eax /* specify zero fill */
|
||||
cld
|
||||
rep
|
||||
stosb
|
||||
|
||||
#ifdef DDB
|
||||
/* include symbols in "kernel image" if they are loaded */
|
||||
movl _bootinfo+BI_ESYMTAB-KERNBASE,%edi
|
||||
testl %edi,%edi
|
||||
je over_symalloc
|
||||
addl $NBPG-1,%edi
|
||||
andl $~(NBPG-1),%edi
|
||||
movl %edi,%esi
|
||||
movl %esi,_KERNend-KERNBASE
|
||||
movl $KERNBASE,%edi
|
||||
addl %edi,_bootinfo+BI_SYMTAB-KERNBASE
|
||||
addl %edi,_bootinfo+BI_ESYMTAB-KERNBASE
|
||||
over_symalloc:
|
||||
#endif
|
||||
|
||||
/*
|
||||
* The value in esi is both the end of the kernel bss and a pointer to
|
||||
* the kernel page directory, and is used by the rest of locore to build
|
||||
* the tables.
|
||||
* esi + 1(page dir) + 2(UPAGES) + 1(p0stack) + NKPT(number of kernel
|
||||
* page table pages) is then passed on the stack to init386(first) as
|
||||
* the value first. esi should ALWAYS be page aligned!!
|
||||
*/
|
||||
movl %esi,%ecx /* Get current first availiable address */
|
||||
|
||||
/* clear pagetables, page directory, stack, etc... */
|
||||
movl %esi,%edi /* base (page directory) */
|
||||
movl $((1+UPAGES+1+NKPT)*NBPG),%ecx /* amount to clear */
|
||||
xorl %eax,%eax /* specify zero fill */
|
||||
cld
|
||||
rep
|
||||
stosb
|
||||
|
||||
/* physical address of Idle proc/kernel page directory */
|
||||
movl %esi,_IdlePTD-KERNBASE
|
||||
|
||||
/*
|
||||
* fillkpt
|
||||
* eax = (page frame address | control | status) == pte
|
||||
* ebx = address of page table
|
||||
* ecx = how many pages to map
|
||||
*/
|
||||
#define fillkpt \
|
||||
1: movl %eax,(%ebx) ; \
|
||||
addl $NBPG,%eax ; /* increment physical address */ \
|
||||
addl $4,%ebx ; /* next pte */ \
|
||||
loop 1b ;
|
||||
|
||||
/*
|
||||
* Map Kernel
|
||||
*
|
||||
* First step - build page tables
|
||||
*/
|
||||
#if defined (KGDB) || defined (BDE_DEBUGGER)
|
||||
movl _KERNend-KERNBASE,%ecx /* this much memory, */
|
||||
shrl $PGSHIFT,%ecx /* for this many PTEs */
|
||||
#ifdef BDE_DEBUGGER
|
||||
cmpl $0xa0,%ecx /* XXX - cover debugger pages */
|
||||
jae 1f
|
||||
movl $0xa0,%ecx
|
||||
1:
|
||||
#endif /* BDE_DEBUGGER */
|
||||
movl $PG_V|PG_KW,%eax /* kernel R/W, valid */
|
||||
lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
|
||||
movl %ebx,_KPTphys-KERNBASE /* save in global */
|
||||
fillkpt
|
||||
|
||||
#else /* !KGDB && !BDE_DEBUGGER */
|
||||
/* write protect kernel text (doesn't do a thing for 386's - only 486's) */
|
||||
movl $_etext-KERNBASE,%ecx /* get size of text */
|
||||
addl $NBPG-1,%ecx /* round up to page */
|
||||
shrl $PGSHIFT,%ecx /* for this many PTEs */
|
||||
movl $PG_V|PG_KR,%eax /* specify read only */
|
||||
#if 0
|
||||
movl $_etext,%ecx /* get size of text */
|
||||
subl $_btext,%ecx
|
||||
addl $NBPG-1,%ecx /* round up to page */
|
||||
shrl $PGSHIFT,%ecx /* for this many PTEs */
|
||||
movl $_btext-KERNBASE,%eax /* get offset to physical memory */
|
||||
orl $PG_V|PG_KR,%eax /* specify read only */
|
||||
#endif
|
||||
lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
|
||||
movl %ebx,_KPTphys-KERNBASE /* save in global */
|
||||
fillkpt
|
||||
|
||||
/* data and bss are r/w */
|
||||
andl $PG_FRAME,%eax /* strip to just addr of bss */
|
||||
movl _KERNend-KERNBASE,%ecx /* calculate size */
|
||||
subl %eax,%ecx
|
||||
shrl $PGSHIFT,%ecx
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
fillkpt
|
||||
#endif /* KGDB || BDE_DEBUGGER */
|
||||
|
||||
/* now initialize the page dir, upages, and p0stack PT */
|
||||
|
||||
movl $(1+UPAGES+1),%ecx /* number of PTEs */
|
||||
movl %esi,%eax /* phys address of PTD */
|
||||
andl $PG_FRAME,%eax /* convert to PFN, should be a NOP */
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
movl %esi,%ebx /* calculate pte offset to ptd */
|
||||
shrl $PGSHIFT-2,%ebx
|
||||
addl %esi,%ebx /* address of page directory */
|
||||
addl $((1+UPAGES+1)*NBPG),%ebx /* offset to kernel page tables */
|
||||
fillkpt
|
||||
|
||||
/* map I/O memory map */
|
||||
|
||||
movl _KPTphys-KERNBASE,%ebx /* base of kernel page tables */
|
||||
lea (0xa0 * PTESIZE)(%ebx),%ebx /* hardwire ISA hole at KERNBASE + 0xa0000 */
|
||||
movl $0x100-0xa0,%ecx /* for this many pte s, */
|
||||
movl $(0xa0000|PG_V|PG_KW|PG_N),%eax /* valid, kernel read/write, non-cacheable */
|
||||
movl %ebx,_atdevphys-KERNBASE /* save phys addr of ptes */
|
||||
fillkpt
|
||||
|
||||
/* map proc 0's kernel stack into user page table page */
|
||||
|
||||
movl $UPAGES,%ecx /* for this many pte s, */
|
||||
lea (1*NBPG)(%esi),%eax /* physical address in proc 0 */
|
||||
lea (KERNBASE)(%eax),%edx /* change into virtual addr */
|
||||
movl %edx,_proc0paddr-KERNBASE /* save VA for proc 0 init */
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
lea ((1+UPAGES)*NBPG)(%esi),%ebx /* addr of stack page table in proc 0 */
|
||||
addl $(KSTKPTEOFF * PTESIZE),%ebx /* offset to kernel stack PTE */
|
||||
fillkpt
|
||||
|
||||
/*
|
||||
* Initialize kernel page table directory
|
||||
*/
|
||||
/* install a pde for temporary double map of bottom of VA */
|
||||
movl _KPTphys-KERNBASE,%eax
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
movl %eax,(%esi) /* which is where temp maps! */
|
||||
|
||||
/* initialize kernel pde's */
|
||||
movl $(NKPT),%ecx /* for this many PDEs */
|
||||
lea (KPTDI*PDESIZE)(%esi),%ebx /* offset of pde for kernel */
|
||||
fillkpt
|
||||
|
||||
/* install a pde recursively mapping page directory as a page table! */
|
||||
movl %esi,%eax /* phys address of ptd in proc 0 */
|
||||
orl $PG_V|PG_KW,%eax /* pde entry is valid */
|
||||
movl %eax,PTDPTDI*PDESIZE(%esi) /* which is where PTmap maps! */
|
||||
|
||||
/* install a pde to map kernel stack for proc 0 */
|
||||
lea ((1+UPAGES)*NBPG)(%esi),%eax /* physical address of pt in proc 0 */
|
||||
orl $PG_V|PG_KW,%eax /* pde entry is valid */
|
||||
movl %eax,KSTKPTDI*PDESIZE(%esi) /* which is where kernel stack maps! */
|
||||
|
||||
#ifdef BDE_DEBUGGER
|
||||
/* copy and convert stuff from old gdt and idt for debugger */
|
||||
|
||||
cmpl $0x0375c339,0x96104 /* XXX - debugger signature */
|
||||
jne 1f
|
||||
movb $1,_bdb_exists-KERNBASE
|
||||
1:
|
||||
pushal
|
||||
subl $2*6,%esp
|
||||
|
||||
sgdt (%esp)
|
||||
movl 2(%esp),%esi /* base address of current gdt */
|
||||
movl $_gdt-KERNBASE,%edi
|
||||
movl %edi,2(%esp)
|
||||
movl $8*18/4,%ecx
|
||||
cld
|
||||
rep /* copy gdt */
|
||||
movsl
|
||||
movl $_gdt-KERNBASE,-8+2(%edi) /* adjust gdt self-ptr */
|
||||
movb $0x92,-8+5(%edi)
|
||||
|
||||
sidt 6(%esp)
|
||||
movl 6+2(%esp),%esi /* base address of current idt */
|
||||
movl 8+4(%esi),%eax /* convert dbg descriptor to ... */
|
||||
movw 8(%esi),%ax
|
||||
movl %eax,bdb_dbg_ljmp+1-KERNBASE /* ... immediate offset ... */
|
||||
movl 8+2(%esi),%eax
|
||||
movw %ax,bdb_dbg_ljmp+5-KERNBASE /* ... and selector for ljmp */
|
||||
movl 24+4(%esi),%eax /* same for bpt descriptor */
|
||||
movw 24(%esi),%ax
|
||||
movl %eax,bdb_bpt_ljmp+1-KERNBASE
|
||||
movl 24+2(%esi),%eax
|
||||
movw %ax,bdb_bpt_ljmp+5-KERNBASE
|
||||
|
||||
movl $_idt-KERNBASE,%edi
|
||||
movl %edi,6+2(%esp)
|
||||
movl $8*4/4,%ecx
|
||||
cld
|
||||
rep /* copy idt */
|
||||
movsl
|
||||
|
||||
lgdt (%esp)
|
||||
lidt 6(%esp)
|
||||
|
||||
addl $2*6,%esp
|
||||
popal
|
||||
#endif /* BDE_DEBUGGER */
|
||||
|
||||
/* load base of page directory and enable mapping */
|
||||
movl %esi,%eax /* phys address of ptd in proc 0 */
|
||||
movl %eax,%cr3 /* load ptd addr into mmu */
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_PE|CR0_PG,%eax /* enable paging */
|
||||
movl %eax,%cr0 /* and let's page NOW! */
|
||||
|
||||
pushl $begin /* jump to high mem */
|
||||
ret
|
||||
|
||||
begin: /* now running relocated at KERNBASE where the system is linked to run */
|
||||
movl _atdevphys,%edx /* get pte PA */
|
||||
subl _KPTphys,%edx /* remove base of ptes, now have phys offset */
|
||||
shll $PGSHIFT-2,%edx /* corresponding to virt offset */
|
||||
addl $KERNBASE,%edx /* add virtual base */
|
||||
movl %edx,_atdevbase
|
||||
|
||||
/* set up bootstrap stack */
|
||||
movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */
|
||||
xorl %eax,%eax /* mark end of frames */
|
||||
movl %eax,%ebp
|
||||
movl _proc0paddr,%eax
|
||||
movl %esi,PCB_CR3(%eax)
|
||||
|
||||
#ifdef BDE_DEBUGGER
|
||||
/* relocate debugger gdt entries */
|
||||
|
||||
movl $_gdt+8*9,%eax /* adjust slots 9-17 */
|
||||
movl $9,%ecx
|
||||
reloc_gdt:
|
||||
movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */
|
||||
addl $8,%eax /* now KERNBASE>>24 */
|
||||
loop reloc_gdt
|
||||
|
||||
cmpl $0,_bdb_exists
|
||||
je 1f
|
||||
int $3
|
||||
1:
|
||||
#endif /* BDE_DEBUGGER */
|
||||
|
||||
/*
|
||||
* Prepare "first" - physical address of first available page
|
||||
* after the kernel+pdir+upages+p0stack+page tables
|
||||
*/
|
||||
lea ((1+UPAGES+1+NKPT)*NBPG)(%esi),%esi
|
||||
|
||||
pushl %esi /* value of first for init386(first) */
|
||||
call _init386 /* wire 386 chip for unix operation */
|
||||
popl %esi
|
||||
|
||||
.globl __ucodesel,__udatasel
|
||||
|
||||
pushl $0 /* unused */
|
||||
pushl __udatasel /* ss */
|
||||
pushl $0 /* esp - filled in by execve() */
|
||||
pushl $PSL_USER /* eflags (IOPL 0, int enab) */
|
||||
pushl __ucodesel /* cs */
|
||||
pushl $0 /* eip - filled in by execve() */
|
||||
subl $(12*4),%esp /* space for rest of registers */
|
||||
|
||||
pushl %esp /* call main with frame pointer */
|
||||
call _main /* autoconfiguration, mountroot etc */
|
||||
|
||||
addl $(13*4),%esp /* back to a frame we can return with */
|
||||
|
||||
/*
|
||||
* now we've run main() and determined what cpu-type we are, we can
|
||||
* enable write protection and alignment checking on i486 cpus and
|
||||
* above.
|
||||
*/
|
||||
#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
|
||||
cmpl $CPUCLASS_386,_cpu_class
|
||||
je 1f
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_WP|CR0_AM,%eax /* enable i486 features */
|
||||
movl %eax,%cr0 /* and do it */
|
||||
#endif
|
||||
/*
|
||||
* on return from main(), we are process 1
|
||||
* set up address space and stack so that we can 'return' to user mode
|
||||
*/
|
||||
1:
|
||||
movl __ucodesel,%eax
|
||||
movl __udatasel,%ecx
|
||||
|
||||
movl %cx,%ds
|
||||
movl %cx,%es
|
||||
movl %ax,%fs /* double map cs to fs */
|
||||
movl %cx,%gs /* and ds to gs */
|
||||
iret /* goto user! */
|
||||
|
||||
#define LCALL(x,y) .byte 0x9a ; .long y ; .word x
|
||||
|
||||
/*
|
||||
* Signal trampoline, copied to top of user stack
|
||||
/**********************************************************************
|
||||
*
|
||||
* Create the first page directory and it's page tables
|
||||
*
|
||||
*/
|
||||
NON_GPROF_ENTRY(sigcode)
|
||||
call SIGF_HANDLER(%esp)
|
||||
lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
|
||||
/* copy at 8(%esp)) */
|
||||
pushl %eax
|
||||
pushl %eax /* junk to fake return address */
|
||||
movl $SYS_sigreturn,%eax /* sigreturn() */
|
||||
LCALL(0x7,0) /* enter kernel with args on stack */
|
||||
hlt /* never gets here */
|
||||
.align 2,0x90 /* long word text-align */
|
||||
_esigcode:
|
||||
|
||||
.data
|
||||
.globl _szsigcode
|
||||
_szsigcode:
|
||||
.long _esigcode-_sigcode
|
||||
create_pagetables:
|
||||
|
||||
/* find end of kernel image */
|
||||
movl $R(_end),%esi
|
||||
|
||||
/* include symbols in "kernel image" if they are loaded and useful */
|
||||
#ifdef DDB
|
||||
movl R(_bootinfo+BI_ESYMTAB),%edi
|
||||
testl %edi,%edi
|
||||
je 1f
|
||||
movl %edi,%esi
|
||||
movl $KERNBASE,%edi
|
||||
addl %edi,R(_bootinfo+BI_SYMTAB)
|
||||
addl %edi,R(_bootinfo+BI_ESYMTAB)
|
||||
1:
|
||||
#endif
|
||||
|
||||
ROUND2PAGE(%esi)
|
||||
movl %esi,R(_KERNend) /* save end of kernel */
|
||||
movl %esi,R(physfree) /* save end of kernel */
|
||||
|
||||
/* Allocate Kernel Page Tables */
|
||||
ALLOCPAGES(NKPT)
|
||||
movl %esi,R(_KPTphys)
|
||||
|
||||
/* Allocate Page Table Directory */
|
||||
ALLOCPAGES(1)
|
||||
movl %esi,R(_IdlePTD)
|
||||
|
||||
/* Allocate UPAGES */
|
||||
ALLOCPAGES(UPAGES)
|
||||
movl %esi,R(upa);
|
||||
addl $KERNBASE, %esi
|
||||
movl %esi, R(_proc0paddr)
|
||||
|
||||
/* Allocate P0 Stack */
|
||||
ALLOCPAGES(1)
|
||||
movl %esi,R(p0s);
|
||||
|
||||
/* Map read-only from zero to the end of the kernel text section */
|
||||
movl R(_KPTphys), %esi
|
||||
movl $R(_etext),%ecx
|
||||
addl $NBPG-1,%ecx
|
||||
shrl $PGSHIFT,%ecx
|
||||
movl $PG_V|PG_KR,%eax
|
||||
movl %esi, %ebx
|
||||
fillkpt
|
||||
|
||||
/* Map read-write, data, bss and symbols */
|
||||
andl $PG_FRAME,%eax
|
||||
movl R(_KERNend),%ecx
|
||||
subl %eax,%ecx
|
||||
shrl $PGSHIFT,%ecx
|
||||
orl $PG_V|PG_KW,%eax
|
||||
fillkpt
|
||||
|
||||
/* Map PD */
|
||||
movl R(_IdlePTD), %eax
|
||||
movl $1, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* Map Proc 0 kernel stack */
|
||||
movl R(p0s), %eax
|
||||
movl $1, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* ... also in user page table page */
|
||||
movl R(p0s), %eax
|
||||
movl $1, %ecx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl R(_KPTphys), %ebx
|
||||
addl $(KSTKPTEOFF * PTESIZE), %ebx
|
||||
fillkpt
|
||||
|
||||
/* Map UPAGES */
|
||||
movl R(upa), %eax
|
||||
movl $UPAGES, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* ... also in user page table page */
|
||||
movl R(upa), %eax
|
||||
movl $UPAGES, %ecx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl R(p0s), %ebx
|
||||
addl $(KSTKPTEOFF * PTESIZE), %ebx
|
||||
fillkpt
|
||||
|
||||
/* and a pde entry too */
|
||||
movl R(p0s), %eax
|
||||
movl R(_IdlePTD), %esi
|
||||
orl $PG_V|PG_KW,%eax
|
||||
movl %eax,KSTKPTDI*PDESIZE(%esi)
|
||||
|
||||
/* Map ISA hole */
|
||||
#define ISA_HOLE_START 0xa0000
|
||||
#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
|
||||
movl $ISA_HOLE_LENGTH>>PGSHIFT, %ecx
|
||||
movl ISA_HOLE_START, %eax
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW|PG_N, %eax
|
||||
fillkpt
|
||||
movl ISA_HOLE_START, %eax
|
||||
addl $KERNBASE, %eax
|
||||
movl %eax, R(_atdevbase)
|
||||
|
||||
/* install a pde for temporary double map of bottom of VA */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl R(_KPTphys), %eax
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl %eax, (%esi)
|
||||
|
||||
/* install pde's for pt's */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl R(_KPTphys), %eax
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl $(NKPT), %ecx
|
||||
lea (KPTDI*PDESIZE)(%esi), %ebx
|
||||
fillkpt
|
||||
|
||||
/* install a pde recursively mapping page directory as a page table */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl %esi,%eax
|
||||
orl $PG_V|PG_KW,%eax
|
||||
movl %eax,PTDPTDI*PDESIZE(%esi)
|
||||
|
||||
ret
|
||||
|
||||
@ -35,7 +35,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
|
||||
* $Id: machdep.c,v 1.182 1996/04/19 07:27:57 phk Exp $
|
||||
* $Id: machdep.c,v 1.183 1996/04/25 06:20:10 phk Exp $
|
||||
*/
|
||||
|
||||
#include "npx.h"
|
||||
@ -171,6 +171,7 @@ int _udatasel, _ucodesel;
|
||||
|
||||
|
||||
int physmem = 0;
|
||||
int cold = 1;
|
||||
|
||||
static int
|
||||
sysctl_hw_physmem SYSCTL_HANDLER_ARGS
|
||||
|
||||
@ -34,15 +34,13 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
|
||||
* $Id: locore.s,v 1.63 1996/03/02 19:37:38 peter Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
* locore.s: FreeBSD machine support for the Intel 386
|
||||
* $Id: locore.s,v 1.64 1996/03/27 17:16:29 bde Exp $
|
||||
*
|
||||
* originally from: locore.s, by William F. Jolitz
|
||||
*
|
||||
* Substantially rewritten by David Greenman, Rod Grimes,
|
||||
* Bruce Evans, Wolfgang Solfrank, and many others.
|
||||
* Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
|
||||
* and many others.
|
||||
*/
|
||||
|
||||
#include "apm.h"
|
||||
@ -112,7 +110,7 @@ tmpstk:
|
||||
|
||||
.globl _boothowto,_bootdev
|
||||
|
||||
.globl _cpu,_cold,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo
|
||||
.globl _cpu,_atdevbase,_cpu_vendor,_cpu_id,_bootinfo
|
||||
.globl _cpu_high, _cpu_feature
|
||||
|
||||
_cpu: .long 0 /* are we 386, 386sx, or 486 */
|
||||
@ -121,11 +119,12 @@ _cpu_high: .long 0 /* highest arg to CPUID */
|
||||
_cpu_feature: .long 0 /* features */
|
||||
_cpu_vendor: .space 20 /* CPU origin code */
|
||||
_bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */
|
||||
_cold: .long 1 /* cold till we are not */
|
||||
_atdevbase: .long 0 /* location of start of iomem in virtual */
|
||||
_atdevphys: .long 0 /* location of device mapping ptes (phys) */
|
||||
|
||||
_KERNend: .long 0 /* phys addr end of kernel (just after bss) */
|
||||
physfree: .long 0 /* phys addr end of kernel (just after bss) */
|
||||
upa: .long 0 /* phys addr end of kernel (just after bss) */
|
||||
p0s: .long 0 /* phys addr end of kernel (just after bss) */
|
||||
|
||||
.globl _IdlePTD
|
||||
_IdlePTD: .long 0 /* phys addr of kernel PTD */
|
||||
@ -135,36 +134,182 @@ _KPTphys: .long 0 /* phys addr of kernel page tables */
|
||||
.globl _proc0paddr
|
||||
_proc0paddr: .long 0 /* address of proc 0 address space */
|
||||
|
||||
#ifdef BDE_DEBUGGER
|
||||
.globl _bdb_exists /* flag to indicate BDE debugger is available */
|
||||
_bdb_exists: .long 0
|
||||
#endif
|
||||
|
||||
/*
|
||||
* System Initialization
|
||||
/**********************************************************************
|
||||
*
|
||||
* Some handy macros
|
||||
*
|
||||
*/
|
||||
.text
|
||||
|
||||
#define R(foo) ((foo)-KERNBASE)
|
||||
|
||||
#define ROUND2PAGE(foo) addl $NBPG-1, foo; andl $~(NBPG-1), foo
|
||||
|
||||
#define ALLOCPAGES(foo) \
|
||||
movl R(physfree), %esi ; \
|
||||
movl $((foo)*NBPG), %eax ; \
|
||||
addl %esi, %eax ; \
|
||||
movl %eax, R(physfree) ; \
|
||||
movl %esi, %edi ; \
|
||||
movl $((foo)*NBPG),%ecx ; \
|
||||
xorl %eax,%eax ; \
|
||||
cld ; rep ; stosb
|
||||
|
||||
/*
|
||||
* btext: beginning of text section.
|
||||
* Also the entry point (jumped to directly from the boot blocks).
|
||||
* fillkpt
|
||||
* eax = (page frame address | control | status) == pte
|
||||
* ebx = address of page table
|
||||
* ecx = how many pages to map
|
||||
*/
|
||||
#define fillkpt \
|
||||
1: movl %eax,(%ebx) ; \
|
||||
addl $NBPG,%eax ; /* increment physical address */ \
|
||||
addl $4,%ebx ; /* next pte */ \
|
||||
loop 1b ;
|
||||
|
||||
.text
|
||||
/**********************************************************************
|
||||
*
|
||||
* This is where the bootblocks start us, set the ball rolling...
|
||||
*
|
||||
*/
|
||||
NON_GPROF_ENTRY(btext)
|
||||
movw $0x1234,0x472 /* warm boot */
|
||||
|
||||
/* Set up a real frame, some day we will be doing returns */
|
||||
/* Tell the bios to warmboot next time */
|
||||
movw $0x1234,0x472
|
||||
|
||||
/* Set up a real frame, some day we may be doing returns */
|
||||
pushl %ebp
|
||||
movl %esp, %ebp
|
||||
|
||||
/* Don't trust what the BIOS gives for eflags. */
|
||||
/* Don't trust what the BIOS gives for eflags. */
|
||||
pushl $PSL_KERNEL
|
||||
popfl
|
||||
|
||||
/* Don't trust what the BIOS gives for %fs and %gs. */
|
||||
mov %ds, %ax
|
||||
mov %ds, %ax /* ... or segment registers */
|
||||
mov %ax, %es
|
||||
mov %ax, %fs
|
||||
mov %ax, %gs
|
||||
|
||||
call recover_bootinfo
|
||||
|
||||
/* get onto a stack we know the size of */
|
||||
movl $R(tmpstk),%esp
|
||||
mov %ds, %ax
|
||||
mov %ax, %ss
|
||||
|
||||
call identify_cpu
|
||||
|
||||
/* clear bss */
|
||||
movl $R(_end),%ecx
|
||||
movl $R(_edata),%edi
|
||||
subl %edi,%ecx
|
||||
xorl %eax,%eax
|
||||
cld ; rep ; stosb
|
||||
|
||||
#if NAPM > 0
|
||||
call _apm_setup /* ... in i386/apm/apm_setup.s */
|
||||
#endif /* NAPM */
|
||||
|
||||
call create_pagetables
|
||||
|
||||
/* Now enable paging */
|
||||
movl R(_IdlePTD), %eax
|
||||
movl %eax,%cr3 /* load ptd addr into mmu */
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_PE|CR0_PG,%eax /* enable paging */
|
||||
movl %eax,%cr0 /* and let's page NOW! */
|
||||
|
||||
pushl $begin /* jump to high mem */
|
||||
ret
|
||||
|
||||
/* now running relocated at KERNBASE where the system is linked to run */
|
||||
begin:
|
||||
/* set up bootstrap stack */
|
||||
movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */
|
||||
xorl %eax,%eax /* mark end of frames */
|
||||
movl %eax,%ebp
|
||||
movl _proc0paddr,%eax
|
||||
movl _IdlePTD, %esi
|
||||
movl %esi,PCB_CR3(%eax)
|
||||
|
||||
/*
|
||||
* Prepare "first" - physical address of first available page
|
||||
* after the kernel+pdir+upages+p0stack+page tables
|
||||
*/
|
||||
movl physfree, %esi
|
||||
pushl %esi /* value of first for init386(first) */
|
||||
call _init386 /* wire 386 chip for unix operation */
|
||||
popl %esi
|
||||
|
||||
.globl __ucodesel,__udatasel
|
||||
|
||||
pushl $0 /* unused */
|
||||
pushl __udatasel /* ss */
|
||||
pushl $0 /* esp - filled in by execve() */
|
||||
pushl $PSL_USER /* eflags (IOPL 0, int enab) */
|
||||
pushl __ucodesel /* cs */
|
||||
pushl $0 /* eip - filled in by execve() */
|
||||
subl $(12*4),%esp /* space for rest of registers */
|
||||
|
||||
pushl %esp /* call main with frame pointer */
|
||||
call _main /* autoconfiguration, mountroot etc */
|
||||
|
||||
addl $(13*4),%esp /* back to a frame we can return with */
|
||||
|
||||
/*
|
||||
* now we've run main() and determined what cpu-type we are, we can
|
||||
* enable write protection and alignment checking on i486 cpus and
|
||||
* above.
|
||||
*/
|
||||
#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
|
||||
cmpl $CPUCLASS_386,_cpu_class
|
||||
je 1f
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_WP|CR0_AM,%eax /* enable i486 features */
|
||||
movl %eax,%cr0 /* and do it */
|
||||
#endif
|
||||
/*
|
||||
* on return from main(), we are process 1
|
||||
* set up address space and stack so that we can 'return' to user mode
|
||||
*/
|
||||
1:
|
||||
movl __ucodesel,%eax
|
||||
movl __udatasel,%ecx
|
||||
|
||||
movl %cx,%ds
|
||||
movl %cx,%es
|
||||
movl %ax,%fs /* double map cs to fs */
|
||||
movl %cx,%gs /* and ds to gs */
|
||||
iret /* goto user! */
|
||||
|
||||
#define LCALL(x,y) .byte 0x9a ; .long y ; .word x
|
||||
|
||||
/*
|
||||
* Signal trampoline, copied to top of user stack
|
||||
*/
|
||||
NON_GPROF_ENTRY(sigcode)
|
||||
call SIGF_HANDLER(%esp)
|
||||
lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
|
||||
/* copy at 8(%esp)) */
|
||||
pushl %eax
|
||||
pushl %eax /* junk to fake return address */
|
||||
movl $SYS_sigreturn,%eax /* sigreturn() */
|
||||
LCALL(0x7,0) /* enter kernel with args on stack */
|
||||
hlt /* never gets here */
|
||||
.align 2,0x90 /* long word text-align */
|
||||
_esigcode:
|
||||
|
||||
.data
|
||||
.globl _szsigcode
|
||||
_szsigcode:
|
||||
.long _esigcode-_sigcode
|
||||
|
||||
/**********************************************************************
|
||||
*
|
||||
* Recover the bootinfo passed to us from the boot program
|
||||
*
|
||||
*/
|
||||
recover_bootinfo:
|
||||
/*
|
||||
* This code is called in different ways depending on what loaded
|
||||
* and started the kernel. This is used to detect how we get the
|
||||
@ -199,7 +344,7 @@ NON_GPROF_ENTRY(btext)
|
||||
* address of 0.
|
||||
*/
|
||||
cmpl $0,4(%ebp)
|
||||
je 2f /* olddiskboot: */
|
||||
je olddiskboot
|
||||
|
||||
/*
|
||||
* We have some form of return address, so this is either the
|
||||
@ -208,7 +353,7 @@ NON_GPROF_ENTRY(btext)
|
||||
* we are being booted by the new unifrom boot code.
|
||||
*/
|
||||
cmpl $0,24(%ebp)
|
||||
je 1f /* newboot: */
|
||||
je newboot
|
||||
|
||||
/*
|
||||
* Seems we have been loaded by the old diskless boot code, we
|
||||
@ -222,12 +367,13 @@ NON_GPROF_ENTRY(btext)
|
||||
* Lets check the bootinfo version, and if we do not understand
|
||||
* it we return to the loader with a status of 1 to indicate this error
|
||||
*/
|
||||
1: /* newboot: */
|
||||
newboot:
|
||||
movl 28(%ebp),%ebx /* &bootinfo.version */
|
||||
movl BI_VERSION(%ebx),%eax
|
||||
cmpl $1,%eax /* We only understand version 1 */
|
||||
je 1f
|
||||
movl $1,%eax /* Return status */
|
||||
add $4, %esp /* pop recover_bootinfo's retaddr */
|
||||
leave
|
||||
ret
|
||||
|
||||
@ -298,18 +444,21 @@ got_common_bi_size:
|
||||
* Note that the newer boot code just falls into here to pick
|
||||
* up howto and bootdev, cyloffset and esym are no longer used
|
||||
*/
|
||||
2: /* olddiskboot: */
|
||||
olddiskboot:
|
||||
movl 8(%ebp),%eax
|
||||
movl %eax,_boothowto-KERNBASE
|
||||
movl 12(%ebp),%eax
|
||||
movl %eax,_bootdev-KERNBASE
|
||||
|
||||
#if NAPM > 0
|
||||
/* call APM BIOS driver setup (i386/apm/apm_setup.s) */
|
||||
call _apm_setup
|
||||
#endif /* NAPM */
|
||||
ret
|
||||
|
||||
/* Find out our CPU type. */
|
||||
|
||||
/**********************************************************************
|
||||
*
|
||||
* Identify the CPU and initialize anything special about it
|
||||
*
|
||||
*/
|
||||
identify_cpu:
|
||||
|
||||
/* Try to toggle alignment check flag; does not exist on 386. */
|
||||
pushfl
|
||||
@ -391,9 +540,9 @@ got_common_bi_size:
|
||||
andb $~CCR0_NC0,%al
|
||||
#ifndef CYRIX_CACHE_REALLY_WORKS
|
||||
orb $(CCR0_NC1|CCR0_BARB),%al
|
||||
#else
|
||||
#else /* !CYRIX_CACHE_REALLY_WORKS */
|
||||
orb $CCR0_NC1,%al
|
||||
#endif
|
||||
#endif /* CYRIX_CACHE_REALLY_WORKS */
|
||||
movb %al,%ah
|
||||
movb $CCR0,%al
|
||||
outb %al,$0x22
|
||||
@ -458,351 +607,152 @@ got_common_bi_size:
|
||||
/* Greater than Pentium...call it a Pentium Pro */
|
||||
movl $CPU_686,_cpu-KERNBASE
|
||||
3:
|
||||
|
||||
/*
|
||||
* Finished with old stack; load new %esp now instead of later so
|
||||
* we can trace this code without having to worry about the trace
|
||||
* trap clobbering the memory test or the zeroing of the bss+bootstrap
|
||||
* page tables.
|
||||
*
|
||||
* XXX - wdboot clears the bss after testing that this is safe.
|
||||
* This is too wasteful - memory below 640K is scarce. The boot
|
||||
* program should check:
|
||||
* text+data <= &stack_variable - more_space_for_stack
|
||||
* text+data+bss+pad+space_for_page_tables <= end_of_memory
|
||||
* Oops, the gdt is in the carcass of the boot program so clearing
|
||||
* the rest of memory is still not possible.
|
||||
*/
|
||||
movl $tmpstk-KERNBASE,%esp /* bootstrap stack end location */
|
||||
|
||||
/*
|
||||
* Virtual address space of kernel:
|
||||
*
|
||||
* text | data | bss | [syms] | page dir | proc0 kernel stack | usr stk map | Sysmap
|
||||
* pages: 1 UPAGES (2) 1 NKPT (7)
|
||||
*/
|
||||
|
||||
/* find end of kernel image */
|
||||
movl $_end-KERNBASE,%ecx
|
||||
addl $NBPG-1,%ecx /* page align up */
|
||||
andl $~(NBPG-1),%ecx
|
||||
movl %ecx,%esi /* esi = start of free memory */
|
||||
movl %ecx,_KERNend-KERNBASE /* save end of kernel */
|
||||
|
||||
/* clear bss */
|
||||
movl $_edata-KERNBASE,%edi
|
||||
subl %edi,%ecx /* get amount to clear */
|
||||
xorl %eax,%eax /* specify zero fill */
|
||||
cld
|
||||
rep
|
||||
stosb
|
||||
|
||||
#ifdef DDB
|
||||
/* include symbols in "kernel image" if they are loaded */
|
||||
movl _bootinfo+BI_ESYMTAB-KERNBASE,%edi
|
||||
testl %edi,%edi
|
||||
je over_symalloc
|
||||
addl $NBPG-1,%edi
|
||||
andl $~(NBPG-1),%edi
|
||||
movl %edi,%esi
|
||||
movl %esi,_KERNend-KERNBASE
|
||||
movl $KERNBASE,%edi
|
||||
addl %edi,_bootinfo+BI_SYMTAB-KERNBASE
|
||||
addl %edi,_bootinfo+BI_ESYMTAB-KERNBASE
|
||||
over_symalloc:
|
||||
#endif
|
||||
|
||||
/*
|
||||
* The value in esi is both the end of the kernel bss and a pointer to
|
||||
* the kernel page directory, and is used by the rest of locore to build
|
||||
* the tables.
|
||||
* esi + 1(page dir) + 2(UPAGES) + 1(p0stack) + NKPT(number of kernel
|
||||
* page table pages) is then passed on the stack to init386(first) as
|
||||
* the value first. esi should ALWAYS be page aligned!!
|
||||
*/
|
||||
movl %esi,%ecx /* Get current first availiable address */
|
||||
|
||||
/* clear pagetables, page directory, stack, etc... */
|
||||
movl %esi,%edi /* base (page directory) */
|
||||
movl $((1+UPAGES+1+NKPT)*NBPG),%ecx /* amount to clear */
|
||||
xorl %eax,%eax /* specify zero fill */
|
||||
cld
|
||||
rep
|
||||
stosb
|
||||
|
||||
/* physical address of Idle proc/kernel page directory */
|
||||
movl %esi,_IdlePTD-KERNBASE
|
||||
|
||||
/*
|
||||
* fillkpt
|
||||
* eax = (page frame address | control | status) == pte
|
||||
* ebx = address of page table
|
||||
* ecx = how many pages to map
|
||||
*/
|
||||
#define fillkpt \
|
||||
1: movl %eax,(%ebx) ; \
|
||||
addl $NBPG,%eax ; /* increment physical address */ \
|
||||
addl $4,%ebx ; /* next pte */ \
|
||||
loop 1b ;
|
||||
|
||||
/*
|
||||
* Map Kernel
|
||||
*
|
||||
* First step - build page tables
|
||||
*/
|
||||
#if defined (KGDB) || defined (BDE_DEBUGGER)
|
||||
movl _KERNend-KERNBASE,%ecx /* this much memory, */
|
||||
shrl $PGSHIFT,%ecx /* for this many PTEs */
|
||||
#ifdef BDE_DEBUGGER
|
||||
cmpl $0xa0,%ecx /* XXX - cover debugger pages */
|
||||
jae 1f
|
||||
movl $0xa0,%ecx
|
||||
1:
|
||||
#endif /* BDE_DEBUGGER */
|
||||
movl $PG_V|PG_KW,%eax /* kernel R/W, valid */
|
||||
lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
|
||||
movl %ebx,_KPTphys-KERNBASE /* save in global */
|
||||
fillkpt
|
||||
|
||||
#else /* !KGDB && !BDE_DEBUGGER */
|
||||
/* write protect kernel text (doesn't do a thing for 386's - only 486's) */
|
||||
movl $_etext-KERNBASE,%ecx /* get size of text */
|
||||
addl $NBPG-1,%ecx /* round up to page */
|
||||
shrl $PGSHIFT,%ecx /* for this many PTEs */
|
||||
movl $PG_V|PG_KR,%eax /* specify read only */
|
||||
#if 0
|
||||
movl $_etext,%ecx /* get size of text */
|
||||
subl $_btext,%ecx
|
||||
addl $NBPG-1,%ecx /* round up to page */
|
||||
shrl $PGSHIFT,%ecx /* for this many PTEs */
|
||||
movl $_btext-KERNBASE,%eax /* get offset to physical memory */
|
||||
orl $PG_V|PG_KR,%eax /* specify read only */
|
||||
#endif
|
||||
lea ((1+UPAGES+1)*NBPG)(%esi),%ebx /* phys addr of kernel PT base */
|
||||
movl %ebx,_KPTphys-KERNBASE /* save in global */
|
||||
fillkpt
|
||||
|
||||
/* data and bss are r/w */
|
||||
andl $PG_FRAME,%eax /* strip to just addr of bss */
|
||||
movl _KERNend-KERNBASE,%ecx /* calculate size */
|
||||
subl %eax,%ecx
|
||||
shrl $PGSHIFT,%ecx
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
fillkpt
|
||||
#endif /* KGDB || BDE_DEBUGGER */
|
||||
|
||||
/* now initialize the page dir, upages, and p0stack PT */
|
||||
|
||||
movl $(1+UPAGES+1),%ecx /* number of PTEs */
|
||||
movl %esi,%eax /* phys address of PTD */
|
||||
andl $PG_FRAME,%eax /* convert to PFN, should be a NOP */
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
movl %esi,%ebx /* calculate pte offset to ptd */
|
||||
shrl $PGSHIFT-2,%ebx
|
||||
addl %esi,%ebx /* address of page directory */
|
||||
addl $((1+UPAGES+1)*NBPG),%ebx /* offset to kernel page tables */
|
||||
fillkpt
|
||||
|
||||
/* map I/O memory map */
|
||||
|
||||
movl _KPTphys-KERNBASE,%ebx /* base of kernel page tables */
|
||||
lea (0xa0 * PTESIZE)(%ebx),%ebx /* hardwire ISA hole at KERNBASE + 0xa0000 */
|
||||
movl $0x100-0xa0,%ecx /* for this many pte s, */
|
||||
movl $(0xa0000|PG_V|PG_KW|PG_N),%eax /* valid, kernel read/write, non-cacheable */
|
||||
movl %ebx,_atdevphys-KERNBASE /* save phys addr of ptes */
|
||||
fillkpt
|
||||
|
||||
/* map proc 0's kernel stack into user page table page */
|
||||
|
||||
movl $UPAGES,%ecx /* for this many pte s, */
|
||||
lea (1*NBPG)(%esi),%eax /* physical address in proc 0 */
|
||||
lea (KERNBASE)(%eax),%edx /* change into virtual addr */
|
||||
movl %edx,_proc0paddr-KERNBASE /* save VA for proc 0 init */
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
lea ((1+UPAGES)*NBPG)(%esi),%ebx /* addr of stack page table in proc 0 */
|
||||
addl $(KSTKPTEOFF * PTESIZE),%ebx /* offset to kernel stack PTE */
|
||||
fillkpt
|
||||
|
||||
/*
|
||||
* Initialize kernel page table directory
|
||||
*/
|
||||
/* install a pde for temporary double map of bottom of VA */
|
||||
movl _KPTphys-KERNBASE,%eax
|
||||
orl $PG_V|PG_KW,%eax /* valid, kernel read/write */
|
||||
movl %eax,(%esi) /* which is where temp maps! */
|
||||
|
||||
/* initialize kernel pde's */
|
||||
movl $(NKPT),%ecx /* for this many PDEs */
|
||||
lea (KPTDI*PDESIZE)(%esi),%ebx /* offset of pde for kernel */
|
||||
fillkpt
|
||||
|
||||
/* install a pde recursively mapping page directory as a page table! */
|
||||
movl %esi,%eax /* phys address of ptd in proc 0 */
|
||||
orl $PG_V|PG_KW,%eax /* pde entry is valid */
|
||||
movl %eax,PTDPTDI*PDESIZE(%esi) /* which is where PTmap maps! */
|
||||
|
||||
/* install a pde to map kernel stack for proc 0 */
|
||||
lea ((1+UPAGES)*NBPG)(%esi),%eax /* physical address of pt in proc 0 */
|
||||
orl $PG_V|PG_KW,%eax /* pde entry is valid */
|
||||
movl %eax,KSTKPTDI*PDESIZE(%esi) /* which is where kernel stack maps! */
|
||||
|
||||
#ifdef BDE_DEBUGGER
|
||||
/* copy and convert stuff from old gdt and idt for debugger */
|
||||
|
||||
cmpl $0x0375c339,0x96104 /* XXX - debugger signature */
|
||||
jne 1f
|
||||
movb $1,_bdb_exists-KERNBASE
|
||||
1:
|
||||
pushal
|
||||
subl $2*6,%esp
|
||||
|
||||
sgdt (%esp)
|
||||
movl 2(%esp),%esi /* base address of current gdt */
|
||||
movl $_gdt-KERNBASE,%edi
|
||||
movl %edi,2(%esp)
|
||||
movl $8*18/4,%ecx
|
||||
cld
|
||||
rep /* copy gdt */
|
||||
movsl
|
||||
movl $_gdt-KERNBASE,-8+2(%edi) /* adjust gdt self-ptr */
|
||||
movb $0x92,-8+5(%edi)
|
||||
|
||||
sidt 6(%esp)
|
||||
movl 6+2(%esp),%esi /* base address of current idt */
|
||||
movl 8+4(%esi),%eax /* convert dbg descriptor to ... */
|
||||
movw 8(%esi),%ax
|
||||
movl %eax,bdb_dbg_ljmp+1-KERNBASE /* ... immediate offset ... */
|
||||
movl 8+2(%esi),%eax
|
||||
movw %ax,bdb_dbg_ljmp+5-KERNBASE /* ... and selector for ljmp */
|
||||
movl 24+4(%esi),%eax /* same for bpt descriptor */
|
||||
movw 24(%esi),%ax
|
||||
movl %eax,bdb_bpt_ljmp+1-KERNBASE
|
||||
movl 24+2(%esi),%eax
|
||||
movw %ax,bdb_bpt_ljmp+5-KERNBASE
|
||||
|
||||
movl $_idt-KERNBASE,%edi
|
||||
movl %edi,6+2(%esp)
|
||||
movl $8*4/4,%ecx
|
||||
cld
|
||||
rep /* copy idt */
|
||||
movsl
|
||||
|
||||
lgdt (%esp)
|
||||
lidt 6(%esp)
|
||||
|
||||
addl $2*6,%esp
|
||||
popal
|
||||
#endif /* BDE_DEBUGGER */
|
||||
|
||||
/* load base of page directory and enable mapping */
|
||||
movl %esi,%eax /* phys address of ptd in proc 0 */
|
||||
movl %eax,%cr3 /* load ptd addr into mmu */
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_PE|CR0_PG,%eax /* enable paging */
|
||||
movl %eax,%cr0 /* and let's page NOW! */
|
||||
|
||||
pushl $begin /* jump to high mem */
|
||||
ret
|
||||
|
||||
begin: /* now running relocated at KERNBASE where the system is linked to run */
|
||||
movl _atdevphys,%edx /* get pte PA */
|
||||
subl _KPTphys,%edx /* remove base of ptes, now have phys offset */
|
||||
shll $PGSHIFT-2,%edx /* corresponding to virt offset */
|
||||
addl $KERNBASE,%edx /* add virtual base */
|
||||
movl %edx,_atdevbase
|
||||
|
||||
/* set up bootstrap stack */
|
||||
movl $_kstack+UPAGES*NBPG,%esp /* bootstrap stack end location */
|
||||
xorl %eax,%eax /* mark end of frames */
|
||||
movl %eax,%ebp
|
||||
movl _proc0paddr,%eax
|
||||
movl %esi,PCB_CR3(%eax)
|
||||
|
||||
#ifdef BDE_DEBUGGER
|
||||
/* relocate debugger gdt entries */
|
||||
|
||||
movl $_gdt+8*9,%eax /* adjust slots 9-17 */
|
||||
movl $9,%ecx
|
||||
reloc_gdt:
|
||||
movb $KERNBASE>>24,7(%eax) /* top byte of base addresses, was 0, */
|
||||
addl $8,%eax /* now KERNBASE>>24 */
|
||||
loop reloc_gdt
|
||||
|
||||
cmpl $0,_bdb_exists
|
||||
je 1f
|
||||
int $3
|
||||
1:
|
||||
#endif /* BDE_DEBUGGER */
|
||||
|
||||
/*
|
||||
* Prepare "first" - physical address of first available page
|
||||
* after the kernel+pdir+upages+p0stack+page tables
|
||||
*/
|
||||
lea ((1+UPAGES+1+NKPT)*NBPG)(%esi),%esi
|
||||
|
||||
pushl %esi /* value of first for init386(first) */
|
||||
call _init386 /* wire 386 chip for unix operation */
|
||||
popl %esi
|
||||
|
||||
.globl __ucodesel,__udatasel
|
||||
|
||||
pushl $0 /* unused */
|
||||
pushl __udatasel /* ss */
|
||||
pushl $0 /* esp - filled in by execve() */
|
||||
pushl $PSL_USER /* eflags (IOPL 0, int enab) */
|
||||
pushl __ucodesel /* cs */
|
||||
pushl $0 /* eip - filled in by execve() */
|
||||
subl $(12*4),%esp /* space for rest of registers */
|
||||
|
||||
pushl %esp /* call main with frame pointer */
|
||||
call _main /* autoconfiguration, mountroot etc */
|
||||
|
||||
addl $(13*4),%esp /* back to a frame we can return with */
|
||||
|
||||
/*
|
||||
* now we've run main() and determined what cpu-type we are, we can
|
||||
* enable write protection and alignment checking on i486 cpus and
|
||||
* above.
|
||||
*/
|
||||
#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)
|
||||
cmpl $CPUCLASS_386,_cpu_class
|
||||
je 1f
|
||||
movl %cr0,%eax /* get control word */
|
||||
orl $CR0_WP|CR0_AM,%eax /* enable i486 features */
|
||||
movl %eax,%cr0 /* and do it */
|
||||
#endif
|
||||
/*
|
||||
* on return from main(), we are process 1
|
||||
* set up address space and stack so that we can 'return' to user mode
|
||||
*/
|
||||
1:
|
||||
movl __ucodesel,%eax
|
||||
movl __udatasel,%ecx
|
||||
|
||||
movl %cx,%ds
|
||||
movl %cx,%es
|
||||
movl %ax,%fs /* double map cs to fs */
|
||||
movl %cx,%gs /* and ds to gs */
|
||||
iret /* goto user! */
|
||||
|
||||
#define LCALL(x,y) .byte 0x9a ; .long y ; .word x
|
||||
|
||||
/*
|
||||
* Signal trampoline, copied to top of user stack
|
||||
/**********************************************************************
|
||||
*
|
||||
* Create the first page directory and it's page tables
|
||||
*
|
||||
*/
|
||||
NON_GPROF_ENTRY(sigcode)
|
||||
call SIGF_HANDLER(%esp)
|
||||
lea SIGF_SC(%esp),%eax /* scp (the call may have clobbered the */
|
||||
/* copy at 8(%esp)) */
|
||||
pushl %eax
|
||||
pushl %eax /* junk to fake return address */
|
||||
movl $SYS_sigreturn,%eax /* sigreturn() */
|
||||
LCALL(0x7,0) /* enter kernel with args on stack */
|
||||
hlt /* never gets here */
|
||||
.align 2,0x90 /* long word text-align */
|
||||
_esigcode:
|
||||
|
||||
.data
|
||||
.globl _szsigcode
|
||||
_szsigcode:
|
||||
.long _esigcode-_sigcode
|
||||
create_pagetables:
|
||||
|
||||
/* find end of kernel image */
|
||||
movl $R(_end),%esi
|
||||
|
||||
/* include symbols in "kernel image" if they are loaded and useful */
|
||||
#ifdef DDB
|
||||
movl R(_bootinfo+BI_ESYMTAB),%edi
|
||||
testl %edi,%edi
|
||||
je 1f
|
||||
movl %edi,%esi
|
||||
movl $KERNBASE,%edi
|
||||
addl %edi,R(_bootinfo+BI_SYMTAB)
|
||||
addl %edi,R(_bootinfo+BI_ESYMTAB)
|
||||
1:
|
||||
#endif
|
||||
|
||||
ROUND2PAGE(%esi)
|
||||
movl %esi,R(_KERNend) /* save end of kernel */
|
||||
movl %esi,R(physfree) /* save end of kernel */
|
||||
|
||||
/* Allocate Kernel Page Tables */
|
||||
ALLOCPAGES(NKPT)
|
||||
movl %esi,R(_KPTphys)
|
||||
|
||||
/* Allocate Page Table Directory */
|
||||
ALLOCPAGES(1)
|
||||
movl %esi,R(_IdlePTD)
|
||||
|
||||
/* Allocate UPAGES */
|
||||
ALLOCPAGES(UPAGES)
|
||||
movl %esi,R(upa);
|
||||
addl $KERNBASE, %esi
|
||||
movl %esi, R(_proc0paddr)
|
||||
|
||||
/* Allocate P0 Stack */
|
||||
ALLOCPAGES(1)
|
||||
movl %esi,R(p0s);
|
||||
|
||||
/* Map read-only from zero to the end of the kernel text section */
|
||||
movl R(_KPTphys), %esi
|
||||
movl $R(_etext),%ecx
|
||||
addl $NBPG-1,%ecx
|
||||
shrl $PGSHIFT,%ecx
|
||||
movl $PG_V|PG_KR,%eax
|
||||
movl %esi, %ebx
|
||||
fillkpt
|
||||
|
||||
/* Map read-write, data, bss and symbols */
|
||||
andl $PG_FRAME,%eax
|
||||
movl R(_KERNend),%ecx
|
||||
subl %eax,%ecx
|
||||
shrl $PGSHIFT,%ecx
|
||||
orl $PG_V|PG_KW,%eax
|
||||
fillkpt
|
||||
|
||||
/* Map PD */
|
||||
movl R(_IdlePTD), %eax
|
||||
movl $1, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* Map Proc 0 kernel stack */
|
||||
movl R(p0s), %eax
|
||||
movl $1, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* ... also in user page table page */
|
||||
movl R(p0s), %eax
|
||||
movl $1, %ecx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl R(_KPTphys), %ebx
|
||||
addl $(KSTKPTEOFF * PTESIZE), %ebx
|
||||
fillkpt
|
||||
|
||||
/* Map UPAGES */
|
||||
movl R(upa), %eax
|
||||
movl $UPAGES, %ecx
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
fillkpt
|
||||
|
||||
/* ... also in user page table page */
|
||||
movl R(upa), %eax
|
||||
movl $UPAGES, %ecx
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl R(p0s), %ebx
|
||||
addl $(KSTKPTEOFF * PTESIZE), %ebx
|
||||
fillkpt
|
||||
|
||||
/* and a pde entry too */
|
||||
movl R(p0s), %eax
|
||||
movl R(_IdlePTD), %esi
|
||||
orl $PG_V|PG_KW,%eax
|
||||
movl %eax,KSTKPTDI*PDESIZE(%esi)
|
||||
|
||||
/* Map ISA hole */
|
||||
#define ISA_HOLE_START 0xa0000
|
||||
#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
|
||||
movl $ISA_HOLE_LENGTH>>PGSHIFT, %ecx
|
||||
movl ISA_HOLE_START, %eax
|
||||
movl %eax, %ebx
|
||||
shrl $PGSHIFT-2, %ebx
|
||||
addl R(_KPTphys), %ebx
|
||||
orl $PG_V|PG_KW|PG_N, %eax
|
||||
fillkpt
|
||||
movl ISA_HOLE_START, %eax
|
||||
addl $KERNBASE, %eax
|
||||
movl %eax, R(_atdevbase)
|
||||
|
||||
/* install a pde for temporary double map of bottom of VA */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl R(_KPTphys), %eax
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl %eax, (%esi)
|
||||
|
||||
/* install pde's for pt's */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl R(_KPTphys), %eax
|
||||
orl $PG_V|PG_KW, %eax
|
||||
movl $(NKPT), %ecx
|
||||
lea (KPTDI*PDESIZE)(%esi), %ebx
|
||||
fillkpt
|
||||
|
||||
/* install a pde recursively mapping page directory as a page table */
|
||||
movl R(_IdlePTD), %esi
|
||||
movl %esi,%eax
|
||||
orl $PG_V|PG_KW,%eax
|
||||
movl %eax,PTDPTDI*PDESIZE(%esi)
|
||||
|
||||
ret
|
||||
|
||||
@ -35,7 +35,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
|
||||
* $Id: machdep.c,v 1.182 1996/04/19 07:27:57 phk Exp $
|
||||
* $Id: machdep.c,v 1.183 1996/04/25 06:20:10 phk Exp $
|
||||
*/
|
||||
|
||||
#include "npx.h"
|
||||
@ -171,6 +171,7 @@ int _udatasel, _ucodesel;
|
||||
|
||||
|
||||
int physmem = 0;
|
||||
int cold = 1;
|
||||
|
||||
static int
|
||||
sysctl_hw_physmem SYSCTL_HANDLER_ARGS
|
||||
|
||||
Loading…
Reference in New Issue
Block a user