4f7710fc47
__FreeBSD_version 500015 can be used to detect their disappearance. - Move the symbols for SMP_prvspace and lapic from globals.s to locore.s. - Remove globals.s with extreme prejudice.
982 lines
24 KiB
ArmAsm
982 lines
24 KiB
ArmAsm
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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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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* $FreeBSD$
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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, Poul-Henning Kamp
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* and many others.
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*/
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#include "opt_bootp.h"
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#include "opt_nfsroot.h"
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#include <sys/syscall.h>
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#include <sys/reboot.h>
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#include <machine/asmacros.h>
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#include <machine/cputypes.h>
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#include <machine/psl.h>
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#include <machine/pmap.h>
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#include <machine/specialreg.h>
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#include "assym.s"
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/*
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* XXX
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*
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* Note: This version greatly munged to avoid various assembler errors
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* that may be fixed in newer versions of gas. Perhaps newer versions
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* will have more pleasant appearance.
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*/
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/*
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* PTmap is recursive pagemap at top of virtual address space.
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* Within PTmap, the page directory can be found (third indirection).
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*/
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.globl _PTmap,_PTD,_PTDpde
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.set _PTmap,(PTDPTDI << PDRSHIFT)
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.set _PTD,_PTmap + (PTDPTDI * PAGE_SIZE)
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.set _PTDpde,_PTD + (PTDPTDI * PDESIZE)
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/*
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* APTmap, APTD is the alternate recursive pagemap.
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* It's used when modifying another process's page tables.
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*/
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.globl _APTmap,_APTD,_APTDpde
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.set _APTmap,APTDPTDI << PDRSHIFT
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.set _APTD,_APTmap + (APTDPTDI * PAGE_SIZE)
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.set _APTDpde,_PTD + (APTDPTDI * PDESIZE)
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#ifdef SMP
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/*
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* Define layout of per-cpu address space.
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* This is "constructed" in locore.s on the BSP and in mp_machdep.c
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* for each AP. DO NOT REORDER THESE WITHOUT UPDATING THE REST!
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*/
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.globl _SMP_prvspace, _lapic
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.set _SMP_prvspace,(MPPTDI << PDRSHIFT)
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.set _lapic,_SMP_prvspace + (NPTEPG-1) * PAGE_SIZE
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#endif /* SMP */
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/*
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* Globals
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*/
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.data
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ALIGN_DATA /* just to be sure */
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.globl HIDENAME(tmpstk)
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.space 0x2000 /* space for tmpstk - temporary stack */
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HIDENAME(tmpstk):
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.globl _boothowto,_bootdev
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.globl _cpu,_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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_cpu_id: .long 0 /* stepping ID */
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_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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_KERNend: .long 0 /* phys addr end of kernel (just after bss) */
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physfree: .long 0 /* phys addr of next free page */
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#ifdef SMP
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.globl _cpu0prvpage
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cpu0pp: .long 0 /* phys addr cpu0 private pg */
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_cpu0prvpage: .long 0 /* relocated version */
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.globl _SMPpt
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SMPptpa: .long 0 /* phys addr SMP page table */
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_SMPpt: .long 0 /* relocated version */
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#endif /* SMP */
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.globl _IdlePTD
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_IdlePTD: .long 0 /* phys addr of kernel PTD */
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#ifdef SMP
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.globl _KPTphys
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#endif
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_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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p0upa: .long 0 /* phys addr of proc0's UPAGES */
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vm86phystk: .long 0 /* PA of vm86/bios stack */
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.globl _vm86paddr, _vm86pa
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_vm86paddr: .long 0 /* address of vm86 region */
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_vm86pa: .long 0 /* phys addr of vm86 region */
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#ifdef BDE_DEBUGGER
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.globl _bdb_exists /* flag to indicate BDE debugger is present */
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_bdb_exists: .long 0
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#endif
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#ifdef PC98
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.globl _pc98_system_parameter
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_pc98_system_parameter:
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.space 0x240
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#endif
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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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#define R(foo) ((foo)-KERNBASE)
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#define ALLOCPAGES(foo) \
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movl R(physfree), %esi ; \
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movl $((foo)*PAGE_SIZE), %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)*PAGE_SIZE),%ecx ; \
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xorl %eax,%eax ; \
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cld ; \
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rep ; \
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stosb
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/*
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* fillkpt
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* eax = page frame address
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* ebx = index into page table
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* ecx = how many pages to map
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* base = base address of page dir/table
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* prot = protection bits
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*/
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#define fillkpt(base, prot) \
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shll $2,%ebx ; \
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addl base,%ebx ; \
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orl $PG_V,%eax ; \
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orl prot,%eax ; \
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1: movl %eax,(%ebx) ; \
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addl $PAGE_SIZE,%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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* fillkptphys(prot)
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* eax = physical address
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* ecx = how many pages to map
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* prot = protection bits
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*/
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#define fillkptphys(prot) \
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movl %eax, %ebx ; \
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shrl $PAGE_SHIFT, %ebx ; \
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fillkpt(R(_KPTphys), prot)
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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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#ifdef PC98
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/* save SYSTEM PARAMETER for resume (NS/T or other) */
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movl $0xa1400,%esi
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movl $R(_pc98_system_parameter),%edi
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movl $0x0240,%ecx
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cld
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rep
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movsb
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#else /* IBM-PC */
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#ifdef BDE_DEBUGGER
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#ifdef BIOS_STEALS_3K
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cmpl $0x0375c339,0x95504
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#else
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cmpl $0x0375c339,0x96104 /* XXX - debugger signature */
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#endif
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jne 1f
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movb $1,R(_bdb_exists)
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1:
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#endif
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/* Tell the bios to warmboot next time */
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movw $0x1234,0x472
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#endif /* PC98 */
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/* Set up a real frame in case the double return in newboot is executed. */
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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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pushl $PSL_KERNEL
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popfl
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/*
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* Don't trust what the BIOS gives for %fs and %gs. Trust the bootstrap
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* to set %cs, %ds, %es and %ss.
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*/
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mov %ds, %ax
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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 that we can trust. */
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/*
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* XXX this step is delayed in case recover_bootinfo needs to return via
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* the old stack, but it need not be, since recover_bootinfo actually
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* returns via the old frame.
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*/
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movl $R(HIDENAME(tmpstk)),%esp
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#ifdef PC98
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/* pc98_machine_type & M_EPSON_PC98 */
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testb $0x02,R(_pc98_system_parameter)+220
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jz 3f
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/* epson_machine_id <= 0x0b */
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cmpb $0x0b,R(_pc98_system_parameter)+224
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ja 3f
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/* count up memory */
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movl $0x100000,%eax /* next, talley remaining memory */
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movl $0xFFF-0x100,%ecx
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1: movl 0(%eax),%ebx /* save location to check */
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movl $0xa55a5aa5,0(%eax) /* write test pattern */
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cmpl $0xa55a5aa5,0(%eax) /* does not check yet for rollover */
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jne 2f
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movl %ebx,0(%eax) /* restore memory */
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addl $PAGE_SIZE,%eax
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loop 1b
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2: subl $0x100000,%eax
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shrl $17,%eax
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movb %al,R(_pc98_system_parameter)+1
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3:
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movw R(_pc98_system_parameter+0x86),%ax
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movw %ax,R(_cpu_id)
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#endif
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call identify_cpu
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/* clear bss */
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/*
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* XXX this should be done a little earlier.
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*
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* XXX we don't check that there is memory for our bss and page tables
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* before using it.
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*
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* XXX the boot program somewhat bogusly clears the bss. We still have
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* to do it in case we were unzipped by kzipboot. Then the boot program
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* only clears kzipboot's bss.
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*
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* XXX the gdt and idt are still somewhere in the boot program. We
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* depend on the convention that the boot program is below 1MB and we
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* are above 1MB to keep the gdt and idt away from the bss and page
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* tables. The idt is only used if BDE_DEBUGGER is enabled.
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*/
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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
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rep
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stosb
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call create_pagetables
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/*
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* If the CPU has support for VME, turn it on.
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*/
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testl $CPUID_VME, R(_cpu_feature)
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jz 1f
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movl %cr4, %eax
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orl $CR4_VME, %eax
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movl %eax, %cr4
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1:
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#ifdef BDE_DEBUGGER
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/*
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* Adjust as much as possible for paging before enabling paging so that the
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* adjustments can be traced.
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*/
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call bdb_prepare_paging
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#endif
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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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#ifdef BDE_DEBUGGER
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/*
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* Complete the adjustments for paging so that we can keep tracing through
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* initi386() after the low (physical) addresses for the gdt and idt become
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* invalid.
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*/
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call bdb_commit_paging
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#endif
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pushl $begin /* jump to high virtualized address */
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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 _proc0paddr,%eax /* location of in-kernel pages */
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leal UPAGES*PAGE_SIZE(%eax),%esp /* bootstrap stack end location */
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xorl %ebp,%ebp /* mark end of frames */
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movl _IdlePTD,%esi
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movl %esi,PCB_CR3(%eax)
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pushl physfree /* value of first for init386(first) */
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call _init386 /* wire 386 chip for unix operation */
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/*
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* Clean up the stack in a way that db_numargs() understands, so
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* that backtraces in ddb don't underrun the stack. Traps for
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* inaccessible memory are more fatal than usual this early.
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*/
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addl $4,%esp
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call _mi_startup /* autoconfiguration, mountroot etc */
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/* NOTREACHED */
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addl $0,%esp /* for db_numargs() again */
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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) /* call signal handler */
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lea SIGF_UC(%esp),%eax /* get ucontext_t */
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pushl %eax
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testl $PSL_VM,UC_EFLAGS(%eax)
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jne 9f
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movl UC_GS(%eax),%gs /* restore %gs */
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9:
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movl $SYS_sigreturn,%eax
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pushl %eax /* junk to fake return addr. */
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int $0x80 /* enter kernel with args */
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0: jmp 0b
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ALIGN_TEXT
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_osigcode:
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call *SIGF_HANDLER(%esp) /* call signal handler */
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lea SIGF_SC(%esp),%eax /* get sigcontext */
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pushl %eax
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testl $PSL_VM,SC_PS(%eax)
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jne 9f
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movl SC_GS(%eax),%gs /* restore %gs */
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9:
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movl $0x01d516,SC_TRAPNO(%eax) /* magic: 0ldSiG */
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movl $SYS_sigreturn,%eax
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pushl %eax /* junk to fake return addr. */
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int $0x80 /* enter kernel with args */
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0: jmp 0b
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|
ALIGN_TEXT
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_esigcode:
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|
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|
.data
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.globl _szsigcode, _szosigcode
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_szsigcode:
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.long _esigcode-_sigcode
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_szosigcode:
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.long _esigcode-_osigcode
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.text
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|
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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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* arguments from the other code and what we do with them.
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*
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* Old disk boot blocks:
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* (*btext)(howto, bootdev, cyloffset, esym);
|
|
* [return address == 0, and can NOT be returned to]
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|
* [cyloffset was not supported by the FreeBSD boot code
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|
* and always passed in as 0]
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|
* [esym is also known as total in the boot code, and
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* was never properly supported by the FreeBSD boot code]
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|
*
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|
* Old diskless netboot code:
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* (*btext)(0,0,0,0,&nfsdiskless,0,0,0);
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|
* [return address != 0, and can NOT be returned to]
|
|
* If we are being booted by this code it will NOT work,
|
|
* so we are just going to halt if we find this case.
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*
|
|
* New uniform boot code:
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* (*btext)(howto, bootdev, 0, 0, 0, &bootinfo)
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|
* [return address != 0, and can be returned to]
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|
*
|
|
* There may seem to be a lot of wasted arguments in here, but
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|
* that is so the newer boot code can still load very old kernels
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|
* and old boot code can load new kernels.
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|
*/
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|
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|
/*
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|
* The old style disk boot blocks fake a frame on the stack and
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|
* did an lret to get here. The frame on the stack has a return
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|
* address of 0.
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|
*/
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|
cmpl $0,4(%ebp)
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|
je olddiskboot
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|
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|
/*
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|
* We have some form of return address, so this is either the
|
|
* old diskless netboot code, or the new uniform code. That can
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|
* be detected by looking at the 5th argument, if it is 0
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|
* we are being booted by the new uniform boot code.
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|
*/
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|
cmpl $0,24(%ebp)
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|
je newboot
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|
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|
/*
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|
* Seems we have been loaded by the old diskless boot code, we
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|
* don't stand a chance of running as the diskless structure
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|
* changed considerably between the two, so just halt.
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|
*/
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|
hlt
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|
/*
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|
* We have been loaded by the new uniform boot code.
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|
* Let's 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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|
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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|
leave
|
|
/*
|
|
* XXX this returns to our caller's caller (as is required) since
|
|
* we didn't set up a frame and our caller did.
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|
*/
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|
ret
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|
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|
1:
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|
/*
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|
* If we have a kernelname copy it in
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|
*/
|
|
movl BI_KERNELNAME(%ebx),%esi
|
|
cmpl $0,%esi
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|
je 2f /* No kernelname */
|
|
movl $MAXPATHLEN,%ecx /* Brute force!!! */
|
|
movl $R(_kernelname),%edi
|
|
cmpb $'/',(%esi) /* Make sure it starts with a slash */
|
|
je 1f
|
|
movb $'/',(%edi)
|
|
incl %edi
|
|
decl %ecx
|
|
1:
|
|
cld
|
|
rep
|
|
movsb
|
|
|
|
2:
|
|
/*
|
|
* Determine the size of the boot loader's copy of the bootinfo
|
|
* struct. This is impossible to do properly because old versions
|
|
* of the struct don't contain a size field and there are 2 old
|
|
* versions with the same version number.
|
|
*/
|
|
movl $BI_ENDCOMMON,%ecx /* prepare for sizeless version */
|
|
testl $RB_BOOTINFO,8(%ebp) /* bi_size (and bootinfo) valid? */
|
|
je got_bi_size /* no, sizeless version */
|
|
movl BI_SIZE(%ebx),%ecx
|
|
got_bi_size:
|
|
|
|
/*
|
|
* Copy the common part of the bootinfo struct
|
|
*/
|
|
movl %ebx,%esi
|
|
movl $R(_bootinfo),%edi
|
|
cmpl $BOOTINFO_SIZE,%ecx
|
|
jbe got_common_bi_size
|
|
movl $BOOTINFO_SIZE,%ecx
|
|
got_common_bi_size:
|
|
cld
|
|
rep
|
|
movsb
|
|
|
|
#ifdef NFS_ROOT
|
|
#ifndef BOOTP_NFSV3
|
|
/*
|
|
* If we have a nfs_diskless structure copy it in
|
|
*/
|
|
movl BI_NFS_DISKLESS(%ebx),%esi
|
|
cmpl $0,%esi
|
|
je olddiskboot
|
|
movl $R(_nfs_diskless),%edi
|
|
movl $NFSDISKLESS_SIZE,%ecx
|
|
cld
|
|
rep
|
|
movsb
|
|
movl $R(_nfs_diskless_valid),%edi
|
|
movl $1,(%edi)
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* The old style disk boot.
|
|
* (*btext)(howto, bootdev, cyloffset, esym);
|
|
* Note that the newer boot code just falls into here to pick
|
|
* up howto and bootdev, cyloffset and esym are no longer used
|
|
*/
|
|
olddiskboot:
|
|
movl 8(%ebp),%eax
|
|
movl %eax,R(_boothowto)
|
|
movl 12(%ebp),%eax
|
|
movl %eax,R(_bootdev)
|
|
|
|
ret
|
|
|
|
|
|
/**********************************************************************
|
|
*
|
|
* Identify the CPU and initialize anything special about it
|
|
*
|
|
*/
|
|
identify_cpu:
|
|
|
|
/* Try to toggle alignment check flag; does not exist on 386. */
|
|
pushfl
|
|
popl %eax
|
|
movl %eax,%ecx
|
|
orl $PSL_AC,%eax
|
|
pushl %eax
|
|
popfl
|
|
pushfl
|
|
popl %eax
|
|
xorl %ecx,%eax
|
|
andl $PSL_AC,%eax
|
|
pushl %ecx
|
|
popfl
|
|
|
|
testl %eax,%eax
|
|
jnz try486
|
|
|
|
/* NexGen CPU does not have aligment check flag. */
|
|
pushfl
|
|
movl $0x5555, %eax
|
|
xorl %edx, %edx
|
|
movl $2, %ecx
|
|
clc
|
|
divl %ecx
|
|
jz trynexgen
|
|
popfl
|
|
movl $CPU_386,R(_cpu)
|
|
jmp 3f
|
|
|
|
trynexgen:
|
|
popfl
|
|
movl $CPU_NX586,R(_cpu)
|
|
movl $0x4778654e,R(_cpu_vendor) # store vendor string
|
|
movl $0x72446e65,R(_cpu_vendor+4)
|
|
movl $0x6e657669,R(_cpu_vendor+8)
|
|
movl $0,R(_cpu_vendor+12)
|
|
jmp 3f
|
|
|
|
try486: /* Try to toggle identification flag; does not exist on early 486s. */
|
|
pushfl
|
|
popl %eax
|
|
movl %eax,%ecx
|
|
xorl $PSL_ID,%eax
|
|
pushl %eax
|
|
popfl
|
|
pushfl
|
|
popl %eax
|
|
xorl %ecx,%eax
|
|
andl $PSL_ID,%eax
|
|
pushl %ecx
|
|
popfl
|
|
|
|
testl %eax,%eax
|
|
jnz trycpuid
|
|
movl $CPU_486,R(_cpu)
|
|
|
|
/*
|
|
* Check Cyrix CPU
|
|
* Cyrix CPUs do not change the undefined flags following
|
|
* execution of the divide instruction which divides 5 by 2.
|
|
*
|
|
* Note: CPUID is enabled on M2, so it passes another way.
|
|
*/
|
|
pushfl
|
|
movl $0x5555, %eax
|
|
xorl %edx, %edx
|
|
movl $2, %ecx
|
|
clc
|
|
divl %ecx
|
|
jnc trycyrix
|
|
popfl
|
|
jmp 3f /* You may use Intel CPU. */
|
|
|
|
trycyrix:
|
|
popfl
|
|
/*
|
|
* IBM Bluelighting CPU also doesn't change the undefined flags.
|
|
* Because IBM doesn't disclose the information for Bluelighting
|
|
* CPU, we couldn't distinguish it from Cyrix's (including IBM
|
|
* brand of Cyrix CPUs).
|
|
*/
|
|
movl $0x69727943,R(_cpu_vendor) # store vendor string
|
|
movl $0x736e4978,R(_cpu_vendor+4)
|
|
movl $0x64616574,R(_cpu_vendor+8)
|
|
jmp 3f
|
|
|
|
trycpuid: /* Use the `cpuid' instruction. */
|
|
xorl %eax,%eax
|
|
cpuid # cpuid 0
|
|
movl %eax,R(_cpu_high) # highest capability
|
|
movl %ebx,R(_cpu_vendor) # store vendor string
|
|
movl %edx,R(_cpu_vendor+4)
|
|
movl %ecx,R(_cpu_vendor+8)
|
|
movb $0,R(_cpu_vendor+12)
|
|
|
|
movl $1,%eax
|
|
cpuid # cpuid 1
|
|
movl %eax,R(_cpu_id) # store cpu_id
|
|
movl %edx,R(_cpu_feature) # store cpu_feature
|
|
rorl $8,%eax # extract family type
|
|
andl $15,%eax
|
|
cmpl $5,%eax
|
|
jae 1f
|
|
|
|
/* less than Pentium; must be 486 */
|
|
movl $CPU_486,R(_cpu)
|
|
jmp 3f
|
|
1:
|
|
/* a Pentium? */
|
|
cmpl $5,%eax
|
|
jne 2f
|
|
movl $CPU_586,R(_cpu)
|
|
jmp 3f
|
|
2:
|
|
/* Greater than Pentium...call it a Pentium Pro */
|
|
movl $CPU_686,R(_cpu)
|
|
3:
|
|
ret
|
|
|
|
|
|
/**********************************************************************
|
|
*
|
|
* Create the first page directory and its page tables.
|
|
*
|
|
*/
|
|
|
|
create_pagetables:
|
|
|
|
testl $CPUID_PGE, R(_cpu_feature)
|
|
jz 1f
|
|
movl %cr4, %eax
|
|
orl $CR4_PGE, %eax
|
|
movl %eax, %cr4
|
|
1:
|
|
|
|
/* Find end of kernel image (rounded up to a page boundary). */
|
|
movl $R(_end),%esi
|
|
|
|
/* Include symbols, if any. */
|
|
movl R(_bootinfo+BI_ESYMTAB),%edi
|
|
testl %edi,%edi
|
|
je over_symalloc
|
|
movl %edi,%esi
|
|
movl $KERNBASE,%edi
|
|
addl %edi,R(_bootinfo+BI_SYMTAB)
|
|
addl %edi,R(_bootinfo+BI_ESYMTAB)
|
|
over_symalloc:
|
|
|
|
/* If we are told where the end of the kernel space is, believe it. */
|
|
movl R(_bootinfo+BI_KERNEND),%edi
|
|
testl %edi,%edi
|
|
je no_kernend
|
|
movl %edi,%esi
|
|
no_kernend:
|
|
|
|
addl $PAGE_MASK,%esi
|
|
andl $~PAGE_MASK,%esi
|
|
movl %esi,R(_KERNend) /* save end of kernel */
|
|
movl %esi,R(physfree) /* next free page is at 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(p0upa)
|
|
addl $KERNBASE, %esi
|
|
movl %esi, R(_proc0paddr)
|
|
|
|
ALLOCPAGES(1) /* vm86/bios stack */
|
|
movl %esi,R(vm86phystk)
|
|
|
|
ALLOCPAGES(3) /* pgtable + ext + IOPAGES */
|
|
movl %esi,R(_vm86pa)
|
|
addl $KERNBASE, %esi
|
|
movl %esi, R(_vm86paddr)
|
|
|
|
#ifdef SMP
|
|
/* Allocate cpu0's private data page */
|
|
ALLOCPAGES(1)
|
|
movl %esi,R(cpu0pp)
|
|
addl $KERNBASE, %esi
|
|
movl %esi, R(_cpu0prvpage) /* relocated to KVM space */
|
|
|
|
/* Allocate SMP page table page */
|
|
ALLOCPAGES(1)
|
|
movl %esi,R(SMPptpa)
|
|
addl $KERNBASE, %esi
|
|
movl %esi, R(_SMPpt) /* relocated to KVM space */
|
|
#endif /* SMP */
|
|
|
|
/* Map read-only from zero to the end of the kernel text section */
|
|
xorl %eax, %eax
|
|
#ifdef BDE_DEBUGGER
|
|
/* If the debugger is present, actually map everything read-write. */
|
|
cmpl $0,R(_bdb_exists)
|
|
jne map_read_write
|
|
#endif
|
|
xorl %edx,%edx
|
|
|
|
#if !defined(SMP)
|
|
testl $CPUID_PGE, R(_cpu_feature)
|
|
jz 2f
|
|
orl $PG_G,%edx
|
|
#endif
|
|
|
|
2: movl $R(_etext),%ecx
|
|
addl $PAGE_MASK,%ecx
|
|
shrl $PAGE_SHIFT,%ecx
|
|
fillkptphys(%edx)
|
|
|
|
/* Map read-write, data, bss and symbols */
|
|
movl $R(_etext),%eax
|
|
addl $PAGE_MASK, %eax
|
|
andl $~PAGE_MASK, %eax
|
|
map_read_write:
|
|
movl $PG_RW,%edx
|
|
#if !defined(SMP)
|
|
testl $CPUID_PGE, R(_cpu_feature)
|
|
jz 1f
|
|
orl $PG_G,%edx
|
|
#endif
|
|
|
|
1: movl R(_KERNend),%ecx
|
|
subl %eax,%ecx
|
|
shrl $PAGE_SHIFT,%ecx
|
|
fillkptphys(%edx)
|
|
|
|
/* Map page directory. */
|
|
movl R(_IdlePTD), %eax
|
|
movl $1, %ecx
|
|
fillkptphys($PG_RW)
|
|
|
|
/* Map proc0's UPAGES in the physical way ... */
|
|
movl R(p0upa), %eax
|
|
movl $UPAGES, %ecx
|
|
fillkptphys($PG_RW)
|
|
|
|
/* Map ISA hole */
|
|
movl $ISA_HOLE_START, %eax
|
|
movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx
|
|
fillkptphys($PG_RW)
|
|
|
|
/* Map space for the vm86 region */
|
|
movl R(vm86phystk), %eax
|
|
movl $4, %ecx
|
|
fillkptphys($PG_RW)
|
|
|
|
/* Map page 0 into the vm86 page table */
|
|
movl $0, %eax
|
|
movl $0, %ebx
|
|
movl $1, %ecx
|
|
fillkpt(R(_vm86pa), $PG_RW|PG_U)
|
|
|
|
/* ...likewise for the ISA hole */
|
|
movl $ISA_HOLE_START, %eax
|
|
movl $ISA_HOLE_START>>PAGE_SHIFT, %ebx
|
|
movl $ISA_HOLE_LENGTH>>PAGE_SHIFT, %ecx
|
|
fillkpt(R(_vm86pa), $PG_RW|PG_U)
|
|
|
|
#ifdef SMP
|
|
/* Map cpu0's private page into global kmem (4K @ cpu0prvpage) */
|
|
movl R(cpu0pp), %eax
|
|
movl $1, %ecx
|
|
fillkptphys($PG_RW)
|
|
|
|
/* Map SMP page table page into global kmem FWIW */
|
|
movl R(SMPptpa), %eax
|
|
movl $1, %ecx
|
|
fillkptphys($PG_RW)
|
|
|
|
/* Map the private page into the SMP page table */
|
|
movl R(cpu0pp), %eax
|
|
movl $0, %ebx /* pte offset = 0 */
|
|
movl $1, %ecx /* one private page coming right up */
|
|
fillkpt(R(SMPptpa), $PG_RW)
|
|
|
|
/* ... and put the page table table in the pde. */
|
|
movl R(SMPptpa), %eax
|
|
movl $MPPTDI, %ebx
|
|
movl $1, %ecx
|
|
fillkpt(R(_IdlePTD), $PG_RW)
|
|
|
|
/* Fakeup VA for the local apic to allow early traps. */
|
|
ALLOCPAGES(1)
|
|
movl %esi, %eax
|
|
movl $(NPTEPG-1), %ebx /* pte offset = NTEPG-1 */
|
|
movl $1, %ecx /* one private pt coming right up */
|
|
fillkpt(R(SMPptpa), $PG_RW)
|
|
#endif /* SMP */
|
|
|
|
/* install a pde for temporary double map of bottom of VA */
|
|
movl R(_KPTphys), %eax
|
|
xorl %ebx, %ebx
|
|
movl $1, %ecx
|
|
fillkpt(R(_IdlePTD), $PG_RW)
|
|
|
|
/* install pde's for pt's */
|
|
movl R(_KPTphys), %eax
|
|
movl $KPTDI, %ebx
|
|
movl $NKPT, %ecx
|
|
fillkpt(R(_IdlePTD), $PG_RW)
|
|
|
|
/* install a pde recursively mapping page directory as a page table */
|
|
movl R(_IdlePTD), %eax
|
|
movl $PTDPTDI, %ebx
|
|
movl $1,%ecx
|
|
fillkpt(R(_IdlePTD), $PG_RW)
|
|
|
|
ret
|
|
|
|
#ifdef BDE_DEBUGGER
|
|
bdb_prepare_paging:
|
|
cmpl $0,R(_bdb_exists)
|
|
je bdb_prepare_paging_exit
|
|
|
|
subl $6,%esp
|
|
|
|
/*
|
|
* Copy and convert debugger entries from the bootstrap gdt and idt
|
|
* to the kernel gdt and idt. Everything is still in low memory.
|
|
* Tracing continues to work after paging is enabled because the
|
|
* low memory addresses remain valid until everything is relocated.
|
|
* However, tracing through the setidt() that initializes the trace
|
|
* trap will crash.
|
|
*/
|
|
sgdt (%esp)
|
|
movl 2(%esp),%esi /* base address of bootstrap gdt */
|
|
movl $R(_gdt),%edi
|
|
movl %edi,2(%esp) /* prepare to load kernel gdt */
|
|
movl $8*18/4,%ecx
|
|
cld
|
|
rep /* copy gdt */
|
|
movsl
|
|
movl $R(_gdt),-8+2(%edi) /* adjust gdt self-ptr */
|
|
movb $0x92,-8+5(%edi)
|
|
lgdt (%esp)
|
|
|
|
sidt (%esp)
|
|
movl 2(%esp),%esi /* base address of current idt */
|
|
movl 8+4(%esi),%eax /* convert dbg descriptor to ... */
|
|
movw 8(%esi),%ax
|
|
movl %eax,R(bdb_dbg_ljmp+1) /* ... immediate offset ... */
|
|
movl 8+2(%esi),%eax
|
|
movw %ax,R(bdb_dbg_ljmp+5) /* ... and selector for ljmp */
|
|
movl 24+4(%esi),%eax /* same for bpt descriptor */
|
|
movw 24(%esi),%ax
|
|
movl %eax,R(bdb_bpt_ljmp+1)
|
|
movl 24+2(%esi),%eax
|
|
movw %ax,R(bdb_bpt_ljmp+5)
|
|
movl R(_idt),%edi
|
|
movl %edi,2(%esp) /* prepare to load kernel idt */
|
|
movl $8*4/4,%ecx
|
|
cld
|
|
rep /* copy idt */
|
|
movsl
|
|
lidt (%esp)
|
|
|
|
addl $6,%esp
|
|
|
|
bdb_prepare_paging_exit:
|
|
ret
|
|
|
|
/* Relocate debugger gdt entries and gdt and idt pointers. */
|
|
bdb_commit_paging:
|
|
cmpl $0,_bdb_exists
|
|
je bdb_commit_paging_exit
|
|
|
|
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
|
|
|
|
subl $6,%esp
|
|
sgdt (%esp)
|
|
addl $KERNBASE,2(%esp)
|
|
lgdt (%esp)
|
|
sidt (%esp)
|
|
addl $KERNBASE,2(%esp)
|
|
lidt (%esp)
|
|
addl $6,%esp
|
|
|
|
int $3
|
|
|
|
bdb_commit_paging_exit:
|
|
ret
|
|
|
|
#endif /* BDE_DEBUGGER */
|