Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/kernel/acpi/wakeup_32.S
10820 views
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 <[email protected]>, distribute under GPLv2

7


8
	.code32

9
	ALIGN

10


11
ENTRY(wakeup_pmode_return)

12
wakeup_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

25
1:

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


41
bogus_magic:

42
	jmp	bogus_magic

43


44


45


46
save_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


65
restore_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


74
ENTRY(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

85
ret_point:

86
	call	restore_registers

87
	call	restore_processor_state

88
	ret

89


90
.data

91
ALIGN

92
ENTRY(saved_magic)	.long	0

93
ENTRY(saved_eip)	.long	0

94


95
# saved registers

96
saved_gdt:	.long	0,0

97
saved_idt:	.long	0,0

98
saved_ldt:	.long	0

99
saved_tss:	.long	0

100


101


102