1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* ACPI wakeup real mode startup stub
*/
#include <asm/segment.h>
#include <asm/msr-index.h>
#include <asm/page.h>
#include <asm/pgtable.h>
.code16
.section ".header", "a"
/* This should match the structure in wakeup.h */
.globl wakeup_header
wakeup_header:
video_mode: .short 0 /* Video mode number */
pmode_return: .byte 0x66, 0xea /* ljmpl */
.long 0 /* offset goes here */
.short __KERNEL_CS
pmode_cr0: .long 0 /* Saved %cr0 */
pmode_cr3: .long 0 /* Saved %cr3 */
pmode_cr4: .long 0 /* Saved %cr4 */
pmode_efer: .quad 0 /* Saved EFER */
pmode_gdt: .quad 0
realmode_flags: .long 0
real_magic: .long 0
trampoline_segment: .word 0
signature: .long 0x51ee1111
.text
.globl _start
.code16
wakeup_code:
_start:
cli
cld
/* Set up segments */
movw %cs, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %ss
movl $wakeup_stack_end, %esp
/* Clear the EFLAGS */
pushl $0
popfl
/* Check header signature... */
movl signature, %eax
cmpl $0x51ee1111, %eax
jne bogus_real_magic
/* Check we really have everything... */
movl end_signature, %eax
cmpl $0x65a22c82, %eax
jne bogus_real_magic
/* Call the C code */
calll main
/* Do any other stuff... */
#ifndef CONFIG_64BIT
/* This could also be done in C code... */
movl pmode_cr3, %eax
movl %eax, %cr3
movl pmode_cr4, %ecx
jecxz 1f
movl %ecx, %cr4
1:
movl pmode_efer, %eax
movl pmode_efer + 4, %edx
movl %eax, %ecx
orl %edx, %ecx
jz 1f
movl $0xc0000080, %ecx
wrmsr
1:
lgdtl pmode_gdt
/* This really couldn't... */
movl pmode_cr0, %eax
movl %eax, %cr0
jmp pmode_return
#else
pushw $0
pushw trampoline_segment
pushw $0
lret
#endif
bogus_real_magic:
1:
hlt
jmp 1b
.data
.balign 4
.globl HEAP, heap_end
HEAP:
.long wakeup_heap
heap_end:
.long wakeup_stack
.bss
wakeup_heap:
.space 2048
wakeup_stack:
.space 2048
wakeup_stack_end:
|
