1 .text 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 lidt saved_idt 22 lldt saved_ldt 23 ljmp $(__KERNEL_CS), $1f 241: 25 movl %cr3, %eax 26 movl %eax, %cr3 27 wbinvd 28 29 # and restore the stack ... but you need gdt for this to work 30 movl saved_context_esp, %esp 31 32 movl %cs:saved_magic, %eax 33 cmpl $0x12345678, %eax 34 jne bogus_magic 35 36 # jump to place where we left off 37 movl saved_eip, %eax 38 jmp *%eax 39 40bogus_magic: 41 jmp bogus_magic 42 43 44 45save_registers: 46 sidt saved_idt 47 sldt saved_ldt 48 str saved_tss 49 50 leal 4(%esp), %eax 51 movl %eax, saved_context_esp 52 movl %ebx, saved_context_ebx 53 movl %ebp, saved_context_ebp 54 movl %esi, saved_context_esi 55 movl %edi, saved_context_edi 56 pushfl 57 popl saved_context_eflags 58 59 movl $ret_point, saved_eip 60 ret 61 62 63restore_registers: 64 movl saved_context_ebp, %ebp 65 movl saved_context_ebx, %ebx 66 movl saved_context_esi, %esi 67 movl saved_context_edi, %edi 68 pushl saved_context_eflags 69 popfl 70 ret 71 72ENTRY(do_suspend_lowlevel) 73 call save_processor_state 74 call save_registers 75 pushl $3 76 call acpi_enter_sleep_state 77 addl $4, %esp 78 79# In case of S3 failure, we'll emerge here. Jump 80# to ret_point to recover 81 jmp ret_point 82 .p2align 4,,7 83ret_point: 84 call restore_registers 85 call restore_processor_state 86 ret 87 88.data 89ALIGN 90ENTRY(saved_magic) .long 0 91ENTRY(saved_eip) .long 0 92 93# saved registers 94saved_idt: .long 0,0 95saved_ldt: .long 0 96saved_tss: .long 0 97 98