mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 17:12:06 +00:00
366932deb3
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
253 lines
5.4 KiB
ArmAsm
253 lines
5.4 KiB
ArmAsm
/*
|
|
* relocate_kernel.S - put the kernel image in place to boot
|
|
* Copyright (C) 2002-2004 Eric Biederman <ebiederm@xmission.com>
|
|
*
|
|
* This source code is licensed under the GNU General Public License,
|
|
* Version 2. See the file COPYING for more details.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/page.h>
|
|
#include <asm/kexec.h>
|
|
#include <asm/processor-flags.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
/*
|
|
* Must be relocatable PIC code callable as a C function
|
|
*/
|
|
|
|
#define PTR(x) (x << 2)
|
|
#define PAGE_ATTR (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
|
|
#define PAE_PGD_ATTR (_PAGE_PRESENT)
|
|
|
|
.text
|
|
.align PAGE_SIZE
|
|
.globl relocate_kernel
|
|
relocate_kernel:
|
|
movl 8(%esp), %ebp /* list of pages */
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
/* map the control page at its virtual address */
|
|
|
|
movl PTR(VA_PGD)(%ebp), %edi
|
|
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0xc0000000, %eax
|
|
shrl $27, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_PMD_0)(%ebp), %edx
|
|
orl $PAE_PGD_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
|
|
movl PTR(VA_PMD_0)(%ebp), %edi
|
|
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0x3fe00000, %eax
|
|
shrl $18, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_PTE_0)(%ebp), %edx
|
|
orl $PAGE_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
|
|
movl PTR(VA_PTE_0)(%ebp), %edi
|
|
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0x001ff000, %eax
|
|
shrl $9, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
|
|
orl $PAGE_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
|
|
/* identity map the control page at its physical address */
|
|
|
|
movl PTR(VA_PGD)(%ebp), %edi
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0xc0000000, %eax
|
|
shrl $27, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_PMD_1)(%ebp), %edx
|
|
orl $PAE_PGD_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
|
|
movl PTR(VA_PMD_1)(%ebp), %edi
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0x3fe00000, %eax
|
|
shrl $18, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_PTE_1)(%ebp), %edx
|
|
orl $PAGE_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
|
|
movl PTR(VA_PTE_1)(%ebp), %edi
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0x001ff000, %eax
|
|
shrl $9, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
|
|
orl $PAGE_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
#else
|
|
/* map the control page at its virtual address */
|
|
|
|
movl PTR(VA_PGD)(%ebp), %edi
|
|
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0xffc00000, %eax
|
|
shrl $20, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_PTE_0)(%ebp), %edx
|
|
orl $PAGE_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
|
|
movl PTR(VA_PTE_0)(%ebp), %edi
|
|
movl PTR(VA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0x003ff000, %eax
|
|
shrl $10, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
|
|
orl $PAGE_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
|
|
/* identity map the control page at its physical address */
|
|
|
|
movl PTR(VA_PGD)(%ebp), %edi
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0xffc00000, %eax
|
|
shrl $20, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_PTE_1)(%ebp), %edx
|
|
orl $PAGE_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
|
|
movl PTR(VA_PTE_1)(%ebp), %edi
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %eax
|
|
andl $0x003ff000, %eax
|
|
shrl $10, %eax
|
|
addl %edi, %eax
|
|
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %edx
|
|
orl $PAGE_ATTR, %edx
|
|
movl %edx, (%eax)
|
|
#endif
|
|
|
|
relocate_new_kernel:
|
|
/* read the arguments and say goodbye to the stack */
|
|
movl 4(%esp), %ebx /* page_list */
|
|
movl 8(%esp), %ebp /* list of pages */
|
|
movl 12(%esp), %edx /* start address */
|
|
movl 16(%esp), %ecx /* cpu_has_pae */
|
|
|
|
/* zero out flags, and disable interrupts */
|
|
pushl $0
|
|
popfl
|
|
|
|
/* get physical address of control page now */
|
|
/* this is impossible after page table switch */
|
|
movl PTR(PA_CONTROL_PAGE)(%ebp), %edi
|
|
|
|
/* switch to new set of page tables */
|
|
movl PTR(PA_PGD)(%ebp), %eax
|
|
movl %eax, %cr3
|
|
|
|
/* setup a new stack at the end of the physical control page */
|
|
lea PAGE_SIZE(%edi), %esp
|
|
|
|
/* jump to identity mapped page */
|
|
movl %edi, %eax
|
|
addl $(identity_mapped - relocate_kernel), %eax
|
|
pushl %eax
|
|
ret
|
|
|
|
identity_mapped:
|
|
/* store the start address on the stack */
|
|
pushl %edx
|
|
|
|
/* Set cr0 to a known state:
|
|
* - Paging disabled
|
|
* - Alignment check disabled
|
|
* - Write protect disabled
|
|
* - No task switch
|
|
* - Don't do FP software emulation.
|
|
* - Proctected mode enabled
|
|
*/
|
|
movl %cr0, %eax
|
|
andl $~(X86_CR0_PG | X86_CR0_AM | X86_CR0_WP | X86_CR0_TS | X86_CR0_EM), %eax
|
|
orl $(X86_CR0_PE), %eax
|
|
movl %eax, %cr0
|
|
|
|
/* clear cr4 if applicable */
|
|
testl %ecx, %ecx
|
|
jz 1f
|
|
/* Set cr4 to a known state:
|
|
* Setting everything to zero seems safe.
|
|
*/
|
|
xorl %eax, %eax
|
|
movl %eax, %cr4
|
|
|
|
jmp 1f
|
|
1:
|
|
|
|
/* Flush the TLB (needed?) */
|
|
xorl %eax, %eax
|
|
movl %eax, %cr3
|
|
|
|
/* Do the copies */
|
|
movl %ebx, %ecx
|
|
jmp 1f
|
|
|
|
0: /* top, read another word from the indirection page */
|
|
movl (%ebx), %ecx
|
|
addl $4, %ebx
|
|
1:
|
|
testl $0x1, %ecx /* is it a destination page */
|
|
jz 2f
|
|
movl %ecx, %edi
|
|
andl $0xfffff000, %edi
|
|
jmp 0b
|
|
2:
|
|
testl $0x2, %ecx /* is it an indirection page */
|
|
jz 2f
|
|
movl %ecx, %ebx
|
|
andl $0xfffff000, %ebx
|
|
jmp 0b
|
|
2:
|
|
testl $0x4, %ecx /* is it the done indicator */
|
|
jz 2f
|
|
jmp 3f
|
|
2:
|
|
testl $0x8, %ecx /* is it the source indicator */
|
|
jz 0b /* Ignore it otherwise */
|
|
movl %ecx, %esi /* For every source page do a copy */
|
|
andl $0xfffff000, %esi
|
|
|
|
movl $1024, %ecx
|
|
rep ; movsl
|
|
jmp 0b
|
|
|
|
3:
|
|
|
|
/* To be certain of avoiding problems with self-modifying code
|
|
* I need to execute a serializing instruction here.
|
|
* So I flush the TLB, it's handy, and not processor dependent.
|
|
*/
|
|
xorl %eax, %eax
|
|
movl %eax, %cr3
|
|
|
|
/* set all of the registers to known values */
|
|
/* leave %esp alone */
|
|
|
|
xorl %eax, %eax
|
|
xorl %ebx, %ebx
|
|
xorl %ecx, %ecx
|
|
xorl %edx, %edx
|
|
xorl %esi, %esi
|
|
xorl %edi, %edi
|
|
xorl %ebp, %ebp
|
|
ret
|