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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
[org 0x7c00]
ICR_LOW equ 0x0FEE00300
SVR equ 0x0FEE000F0
LVT1 equ 0x0FEE00350
LVT2 equ 0x0FEE00360
APIC_ENABLED equ 0x000000100
APIC_ID equ 0x0FEE00020
COUNT equ 0x0
start:
mov al,0x80
out 0x70,al
in al,0x21
push ax
mov al,0xff
out 0x21,al
in al,0xa1
push ax
mov al,0xff
out 0xa1,al ;屏蔽PIC
call setup_gdt
mov eax,cr0
or eax,0x1
mov cr0,eax
jmp code_cs:pm
setup_gdt:
lgdt [gdt_descr]
ret
gdt:
gdt_null:
dd 0x0
dd 0x0
gdt_code:
dw 0xffff ;limit(bits 0-15)
dw 0x0 ;基址(bits 0-15)
db 0x0 ;基址(bits 16-23)
db 10011010b ;1st flags,type flags
db 11001111b ;2nd flags,Limit(bits 16-19)
db 0x0 ;基址(bits 24-31)
gdt_data:
dw 0xffff
dw 0x0
db 0x0
db 10010010b
db 11001111b
db 0x0
gdt_end:
gdt_descr:
dw gdt_end-gdt-1
dd gdt
code_cs equ gdt_code-gdt
data_ds equ gdt_data-gdt
ap_init:
jmp $
[bits 32]
pm:
mov ax,data_ds
mov ds,ax
mov ss,ax
mov es,ax
mov fs,ax
mov gs,ax
call initLocalAPIC
jmp $
initLocalAPIC:
mov esi,APIC_ID
mov eax,[esi]
and eax,0xff000000
mov [BOOT_ID],eax
;通过设置一个8bit的APIC虚拟向量寄存器开启本地APIC
mov esi,SVR
mov eax,[esi] ;read SVR(spurious vector register)
and eax,0xFFFFFF0F ;清空虚拟向量寄存器
or eax,APIC_ENABLED ;bit 8=1
mov [esi],eax ;write SVR
;将LVT1编程为ExtInt ,他将信号传递给所有处理的INTR信号
mov esi,LVT1
mov eax,[esi]
and eax,0xFFFE00FF
or eax,0x00005700 ;ExtInt
mov [esi],eax
;将LVT2编程为NMI
mov esi,LVT2
mov eax,[esi]
and eax,0xFFFE00FF
or eax,0x00005400 ;NMI
mov [esi],eax
;广播一个INIT-SIPI-SIPI IPI序列，来唤醒AP进行初始化
;加载中断控制寄存器地址到esi
mov esi,ICR_LOW
mov eax,0xc4500 ;广播 init ipi到所有AP
mov [esi],eax
dw 0x00eb,0x00eb ;等待10毫秒
;mov edx,ap_init
mov eax,0x00c4600 ;广播SIPI API到所有AP 00 4K字节页中的AP启动代码基地址转换为8bit的向量
;add eax,edx
mov [esi],eax
mov [esi],eax
ret
BOOT_ID dd 0x0
times 510-($-$$) db 0
dw 0xaa55
|