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asmhead.asm
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[INSTRSET "i486p"]
VBEMODE EQU 0x105
BOTPAK EQU 0x00280000
DSKCAC EQU 0x00100000
DSKCAC0 EQU 0x00008000
; BOOT_INFO 相关
CYLS EQU 0x0ff0
LEDS EQU 0x0ff1
VMODE EQU 0x0ff2
SCRNX EQU 0x0ff4
SCRNY EQU 0x0ff6
VRAM EQU 0x0ff8
ORG 0xc200
MOV AX,0x9000
MOV ES,AX
MOV DI,0
MOV AX,0x4f00
INT 0x10
CMP AX,0x004f
JNE scrn320
MOV AX,[ES:DI+4]
CMP AX,0x0200
JB scrn320
MOV CX,VBEMODE
MOV AX,0x4f01
INT 0x10
CMP AX,0x004f
JNE scrn320
CMP BYTE [ES:DI+0x19],8 ;颜色数必须为8
JNE scrn320
CMP BYTE [ES:DI+0x1b],4
JNE scrn320
MOV AX,[ES:DI+0x00]
AND AX,0x0080
JZ scrn320
MOV BX,VBEMODE+0x4000
MOV AX,0x4f02
INT 0x10
MOV BYTE [VMODE],8 ;模式
MOV AX,[ES:DI+0x12]
MOV [SCRNX],AX
MOV AX,[ES:DI+0x14]
MOV [SCRNY],AX
MOV EAX,[ES:DI+0x28]
MOV [VRAM],EAX
JMP keystatus
scrn320:
MOV AL,0x13
MOV AH,0x00
INT 0x10
MOV BYTE [VMODE],8
MOV WORD [SCRNX],320
MOV WORD [SCRNY],200
MOV DWORD [VRAM],0x000a0000
keystatus:
MOV AH,0x02
INT 0x16
MOV [LEDS],AL
MOV AL,0xff
OUT 0x21,AL
NOP
OUT 0xa1,AL
CLI
CALL waitkbdout
MOV AL,0xd1
OUT 0x64,AL
CALL waitkbdout
MOV AL,0xdf
OUT 0x60,AL
CALL waitkbdout
[INSTRSET "i486p"]
LGDT [GDTR0] ; GDT
MOV EAX,CR0
AND EAX,0x7fffffff
OR EAX,0x00000001 ;
MOV CR0,EAX
JMP pipelineflush
pipelineflush:
MOV AX,1*8
MOV DS,AX
MOV ES,AX
MOV FS,AX
MOV GS,AX
MOV SS,AX
MOV ESI,bootpack
MOV EDI,BOTPAK
MOV ECX,512*1024/4
CALL memcpy
MOV ESI,0x7c00
MOV EDI,DSKCAC
MOV ECX,512/4
CALL memcpy
MOV ESI,DSKCAC0+512
MOV EDI,DSKCAC+512
MOV ECX,0
MOV CL,BYTE [CYLS]
IMUL ECX,512*18*2/4
SUB ECX,512/4
CALL memcpy
MOV EBX,BOTPAK
MOV ECX,[EBX+16]
ADD ECX,3
SHR ECX,2
JZ skip
MOV ESI,[EBX+20] ; 转送源
ADD ESI,EBX
MOV EDI,[EBX+12] ; 转送目标
CALL memcpy
skip:
MOV ESP,[EBX+12] ; 堆栈的初始化
JMP DWORD 2*8:0x0000001b
waitkbdout:
IN AL,0x64
AND AL,0x02
JNZ waitkbdout
RET
memcpy:
MOV EAX,[ESI]
ADD ESI,4
MOV [EDI],EAX
ADD EDI,4
SUB ECX,1
JNZ memcpy
RET
; memcpy地址前缀大小
ALIGNB 16
GDT0:
RESB 8
DW 0xffff,0x0000,0x9200,0x00cf
DW 0xffff,0x0000,0x9a28,0x0047
DW 0
GDTR0:
DW 8*3-1
DD GDT0
ALIGNB 16
bootpack: