freebsd-dev/sys/i386/xen/locore.s
2009-09-11 23:41:11 +00:00

364 lines
9.5 KiB
ArmAsm

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
* $FreeBSD$
*
* originally from: locore.s, by William F. Jolitz
*
* Substantially rewritten by David Greenman, Rod Grimes,
* Bruce Evans, Wolfgang Solfrank, Poul-Henning Kamp
* and many others.
*/
#include "opt_bootp.h"
#include "opt_compat.h"
#include "opt_nfsroot.h"
#include "opt_global.h"
#include "opt_pmap.h"
#include <sys/syscall.h>
#include <sys/reboot.h>
#include <machine/asmacros.h>
#include <machine/cputypes.h>
#include <machine/psl.h>
#include <machine/pmap.h>
#include <machine/specialreg.h>
#define __ASSEMBLY__
#include <xen/interface/elfnote.h>
/* The defines below have been lifted out of <machine/xen-public/arch-x86_32.h> */
#define FLAT_RING1_CS 0xe019 /* GDT index 259 */
#define FLAT_RING1_DS 0xe021 /* GDT index 260 */
#define KERNEL_CS FLAT_RING1_CS
#define KERNEL_DS FLAT_RING1_DS
#include "assym.s"
.section __xen_guest
.ascii "LOADER=generic,GUEST_OS=freebsd,GUEST_VER=7.0,XEN_VER=xen-3.0,BSD_SYMTAB,VIRT_BASE=0xc0000000"
.byte 0
ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz, "FreeBSD")
ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz, "HEAD")
ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz, "xen-3.0")
ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, .long, KERNBASE)
ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, .long, KERNBASE)
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, .long, btext)
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .long, hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, .long, HYPERVISOR_VIRT_START)
#if 0
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel")
#endif
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz, "writable_page_tables|supervisor_mode_kernel|writable_descriptor_tables")
#ifdef PAE
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz, "yes")
ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .long, PG_V, PG_V)
#else
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz, "no")
ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID, .long, PG_V, PG_V)
#endif
ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz, "generic")
ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long, 1)
/*
* XXX
*
* Note: This version greatly munged to avoid various assembler errors
* that may be fixed in newer versions of gas. Perhaps newer versions
* will have more pleasant appearance.
*/
/*
* PTmap is recursive pagemap at top of virtual address space.
* Within PTmap, the page directory can be found (third indirection).
*/
.globl PTmap,PTD,PTDpde
.set PTmap,(PTDPTDI << PDRSHIFT)
.set PTD,PTmap + (PTDPTDI * PAGE_SIZE)
.set PTDpde,PTD + (PTDPTDI * PDESIZE)
/*
* Compiled KERNBASE location and the kernel load address
*/
.globl kernbase
.set kernbase,KERNBASE
.globl kernload
.set kernload,KERNLOAD
/*
* Globals
*/
.data
ALIGN_DATA /* just to be sure */
.space 0x2000 /* space for tmpstk - temporary stack */
tmpstk:
.globl bootinfo
bootinfo: .space BOOTINFO_SIZE /* bootinfo that we can handle */
.globl KERNend
KERNend: .long 0 /* phys addr end of kernel (just after bss) */
.globl physfree
physfree: .long 0 /* phys addr of next free page */
.globl IdlePTD
IdlePTD: .long 0 /* phys addr of kernel PTD */
#ifdef PAE
.globl IdlePDPT
IdlePDPT: .long 0 /* phys addr of kernel PDPT */
#endif
#ifdef SMP
.globl KPTphys
#endif
KPTphys: .long 0 /* phys addr of kernel page tables */
.globl gdtset
gdtset: .long 0 /* GDT is valid */
.globl proc0kstack
proc0uarea: .long 0 /* address of proc 0 uarea (unused)*/
proc0kstack: .long 0 /* address of proc 0 kstack space */
p0upa: .long 0 /* phys addr of proc0 UAREA (unused) */
p0kpa: .long 0 /* phys addr of proc0's STACK */
vm86phystk: .long 0 /* PA of vm86/bios stack */
.globl vm86paddr, vm86pa
vm86paddr: .long 0 /* address of vm86 region */
vm86pa: .long 0 /* phys addr of vm86 region */
#ifdef PC98
.globl pc98_system_parameter
pc98_system_parameter:
.space 0x240
#endif
.globl avail_space
avail_space: .long 0
/**********************************************************************
*
* Some handy macros
*
*/
/*
* We're already in protected mode, so no remapping is needed.
*/
#define R(foo) (foo)
#define ALLOCPAGES(foo) \
movl R(physfree), %esi ; \
movl $((foo)*PAGE_SIZE), %eax ; \
addl %esi, %eax ; \
movl %eax, R(physfree) ; \
movl %esi, %edi ; \
movl $((foo)*PAGE_SIZE),%ecx ; \
xorl %eax,%eax ; \
cld ; \
rep ; \
stosb
/*
* fillkpt
* eax = page frame address
* ebx = index into page table
* ecx = how many pages to map
* base = base address of page dir/table
* prot = protection bits
*/
#define fillkpt(base, prot) \
shll $PTESHIFT,%ebx ; \
addl base,%ebx ; \
orl $PG_V,%eax ; \
orl prot,%eax ; \
1: movl %eax,(%ebx) ; \
addl $PAGE_SIZE,%eax ; /* increment physical address */ \
addl $PTESIZE,%ebx ; /* next pte */ \
loop 1b
/*
* fillkptphys(prot)
* eax = physical address
* ecx = how many pages to map
* prot = protection bits
*/
#define fillkptphys(prot) \
movl %eax, %ebx ; \
shrl $PAGE_SHIFT, %ebx ; \
fillkpt(R(KPTphys), prot)
/* Temporary stack */
.space 8192
tmpstack:
.long tmpstack, KERNEL_DS
.text
.p2align 12, 0x90
#define HYPERCALL_PAGE_OFFSET 0x1000
.org HYPERCALL_PAGE_OFFSET
ENTRY(hypercall_page)
.cfi_startproc
.skip 0x1000
.cfi_endproc
/**********************************************************************
*
* This is where the bootblocks start us, set the ball rolling...
*
*/
NON_GPROF_ENTRY(btext)
/* At the end of our stack, we shall have free space - so store it */
movl %esp,%ebx
movl %ebx,R(avail_space)
lss tmpstack,%esp
pushl %esi
call initvalues
popl %esi
/* Store the CPUID information */
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 %ebx,R(cpu_procinfo) # store cpu_procinfo
movl %edx,R(cpu_feature) # store cpu_feature
movl %ecx,R(cpu_feature2) # store cpu_feature2
rorl $8,%eax # extract family type
andl $15,%eax
cmpl $5,%eax
movl $CPU_686,R(cpu)
movl proc0kstack,%eax
leal (KSTACK_PAGES*PAGE_SIZE-PCB_SIZE)(%eax),%esp
xorl %ebp,%ebp /* mark end of frames */
#ifdef PAE
movl IdlePDPT,%esi
#else
movl IdlePTD,%esi
#endif
movl %esi,(KSTACK_PAGES*PAGE_SIZE-PCB_SIZE+PCB_CR3)(%eax)
pushl physfree
call init386
addl $4, %esp
call mi_startup
/* NOTREACHED */
int $3
/*
* Signal trampoline, copied to top of user stack
*/
NON_GPROF_ENTRY(sigcode)
calll *SIGF_HANDLER(%esp)
leal SIGF_UC(%esp),%eax /* get ucontext */
pushl %eax
testl $PSL_VM,UC_EFLAGS(%eax)
jne 1f
mov UC_GS(%eax), %gs /* restore %gs */
1:
movl $SYS_sigreturn,%eax
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
1:
jmp 1b
#ifdef COMPAT_FREEBSD4
ALIGN_TEXT
freebsd4_sigcode:
calll *SIGF_HANDLER(%esp)
leal SIGF_UC4(%esp),%eax /* get ucontext */
pushl %eax
testl $PSL_VM,UC4_EFLAGS(%eax)
jne 1f
mov UC4_GS(%eax),%gs /* restore %gs */
1:
movl $344,%eax /* 4.x SYS_sigreturn */
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
/* on stack */
1:
jmp 1b
#endif
#ifdef COMPAT_43
ALIGN_TEXT
osigcode:
call *SIGF_HANDLER(%esp) /* call signal handler */
lea SIGF_SC(%esp),%eax /* get sigcontext */
pushl %eax
testl $PSL_VM,SC_PS(%eax)
jne 9f
movl SC_GS(%eax),%gs /* restore %gs */
9:
movl $103,%eax /* 3.x SYS_sigreturn */
pushl %eax /* junk to fake return addr. */
int $0x80 /* enter kernel with args */
0: jmp 0b
#endif /* COMPAT_43 */
ALIGN_TEXT
esigcode:
.data
.globl szsigcode
szsigcode:
.long esigcode-sigcode
#ifdef COMPAT_FREEBSD4
.globl szfreebsd4_sigcode
szfreebsd4_sigcode:
.long esigcode-freebsd4_sigcode
#endif
#ifdef COMPAT_43
.globl szosigcode
szosigcode:
.long esigcode-osigcode
#endif