1 .section .text..page_aligned 2#include <linux/linkage.h> 3#include <asm/segment.h> 4#include <asm/page_types.h> 5 6# Copyright 2003, 2008 Pavel Machek <pavel@suse.cz>, distribute under GPLv2 7 8 .code32 9 ALIGN 10 11ENTRY(wakeup_pmode_return) 12wakeup_pmode_return: 13 movw $__KERNEL_DS, %ax 14 movw %ax, %ss 15 movw %ax, %ds 16 movw %ax, %es 17 movw %ax, %fs 18 movw %ax, %gs 19 20 # reload the gdt, as we need the full 32 bit address 21 lgdt saved_gdt 22 lidt saved_idt 23 lldt saved_ldt 24 ljmp $(__KERNEL_CS), $1f 251: 26 movl %cr3, %eax 27 movl %eax, %cr3 28 wbinvd 29 30 # and restore the stack ... but you need gdt for this to work 31 movl saved_context_esp, %esp 32 33 movl %cs:saved_magic, %eax 34 cmpl $0x12345678, %eax 35 jne bogus_magic 36 37 # jump to place where we left off 38 movl saved_eip, %eax 39 jmp *%eax 40 41bogus_magic: 42 jmp bogus_magic 43 44 45 46save_registers: 47 sgdt saved_gdt 48 sidt saved_idt 49 sldt saved_ldt 50 str saved_tss 51 52 leal 4(%esp), %eax 53 movl %eax, saved_context_esp 54 movl %ebx, saved_context_ebx 55 movl %ebp, saved_context_ebp 56 movl %esi, saved_context_esi 57 movl %edi, saved_context_edi 58 pushfl 59 popl saved_context_eflags 60 61 movl $ret_point, saved_eip 62 ret 63 64 65restore_registers: 66 movl saved_context_ebp, %ebp 67 movl saved_context_ebx, %ebx 68 movl saved_context_esi, %esi 69 movl saved_context_edi, %edi 70 pushl saved_context_eflags 71 popfl 72 ret 73 74ENTRY(do_suspend_lowlevel) 75 call save_processor_state 76 call save_registers 77 pushl $3 78 call acpi_enter_sleep_state 79 addl $4, %esp 80 81# In case of S3 failure, we'll emerge here. Jump 82# to ret_point to recover 83 jmp ret_point 84 .p2align 4,,7 85ret_point: 86 call restore_registers 87 call restore_processor_state 88 ret 89 90.data 91ALIGN 92ENTRY(saved_magic) .long 0 93ENTRY(saved_eip) .long 0 94 95# saved registers 96saved_gdt: .long 0,0 97saved_idt: .long 0,0 98saved_ldt: .long 0 99saved_tss: .long 0 100