113 lines
2.4 KiB
ArmAsm
113 lines
2.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* This may not use any stack, nor any variable that is not "NoSave":
|
|
*
|
|
* Its rewriting one kernel image with another. What is stack in "old"
|
|
* image could very well be data page in "new" image, and overwriting
|
|
* your own stack under you is bad idea.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/page_types.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/processor-flags.h>
|
|
#include <asm/frame.h>
|
|
|
|
.text
|
|
|
|
SYM_FUNC_START(swsusp_arch_suspend)
|
|
movl %esp, saved_context_esp
|
|
movl %ebx, saved_context_ebx
|
|
movl %ebp, saved_context_ebp
|
|
movl %esi, saved_context_esi
|
|
movl %edi, saved_context_edi
|
|
pushfl
|
|
popl saved_context_eflags
|
|
|
|
/* save cr3 */
|
|
movl %cr3, %eax
|
|
movl %eax, restore_cr3
|
|
|
|
FRAME_BEGIN
|
|
call swsusp_save
|
|
FRAME_END
|
|
RET
|
|
SYM_FUNC_END(swsusp_arch_suspend)
|
|
|
|
SYM_CODE_START(restore_image)
|
|
/* prepare to jump to the image kernel */
|
|
movl restore_jump_address, %ebx
|
|
movl restore_cr3, %ebp
|
|
|
|
movl mmu_cr4_features, %ecx
|
|
|
|
/* jump to relocated restore code */
|
|
movl relocated_restore_code, %eax
|
|
jmpl *%eax
|
|
SYM_CODE_END(restore_image)
|
|
|
|
/* code below has been relocated to a safe page */
|
|
SYM_CODE_START(core_restore_code)
|
|
movl temp_pgt, %eax
|
|
movl %eax, %cr3
|
|
|
|
jecxz 1f # cr4 Pentium and higher, skip if zero
|
|
andl $~(X86_CR4_PGE), %ecx
|
|
movl %ecx, %cr4; # turn off PGE
|
|
movl %cr3, %eax; # flush TLB
|
|
movl %eax, %cr3
|
|
1:
|
|
movl restore_pblist, %edx
|
|
.p2align 4,,7
|
|
|
|
copy_loop:
|
|
testl %edx, %edx
|
|
jz done
|
|
|
|
movl pbe_address(%edx), %esi
|
|
movl pbe_orig_address(%edx), %edi
|
|
|
|
movl $(PAGE_SIZE >> 2), %ecx
|
|
rep
|
|
movsl
|
|
|
|
movl pbe_next(%edx), %edx
|
|
jmp copy_loop
|
|
.p2align 4,,7
|
|
|
|
done:
|
|
jmpl *%ebx
|
|
SYM_CODE_END(core_restore_code)
|
|
|
|
/* code below belongs to the image kernel */
|
|
.align PAGE_SIZE
|
|
SYM_FUNC_START(restore_registers)
|
|
/* go back to the original page tables */
|
|
movl %ebp, %cr3
|
|
movl mmu_cr4_features, %ecx
|
|
jecxz 1f # cr4 Pentium and higher, skip if zero
|
|
movl %ecx, %cr4; # turn PGE back on
|
|
1:
|
|
|
|
movl saved_context_esp, %esp
|
|
movl saved_context_ebp, %ebp
|
|
movl saved_context_ebx, %ebx
|
|
movl saved_context_esi, %esi
|
|
movl saved_context_edi, %edi
|
|
|
|
pushl saved_context_eflags
|
|
popfl
|
|
|
|
/* Saved in save_processor_state. */
|
|
movl $saved_context, %eax
|
|
lgdt saved_context_gdt_desc(%eax)
|
|
|
|
xorl %eax, %eax
|
|
|
|
/* tell the hibernation core that we've just restored the memory */
|
|
movl %eax, in_suspend
|
|
|
|
RET
|
|
SYM_FUNC_END(restore_registers)
|