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asmhead.nas
145 lines (117 loc) · 4.22 KB
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asmhead.nas
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; haribote-os
; TAB=4
BOTPAK EQU 0x00280000 ; bootpack‚̃[ƒhæ
DSKCAC EQU 0x00100000 ; ƒfƒBƒXƒNƒLƒƒƒbƒVƒ…‚ÌêŠ
DSKCAC0 EQU 0x00008000 ; ƒfƒBƒXƒNƒLƒƒƒbƒVƒ…‚ÌêŠiƒŠƒAƒ‹ƒ‚[ƒhj
; 关于启动信息 BOOT_INFO
CYLS EQU 0x0ff0 ; 设定启动区
LEDS EQU 0x0ff1 ; 保存键盘状态
VMODE EQU 0x0ff2 ; 保存颜色信息
SCRNX EQU 0x0ff4 ; x轴分辨率
SCRNY EQU 0x0ff6 ; y轴分辨率
VRAM EQU 0x0ff8 ; 保存图像缓冲区地址
ORG 0xc200
; VGA显卡， 320x200x8bit 彩色
MOV AL,0x13
MOV AH,0x00
INT 0x10
MOV BYTE [VMODE], 8 ; 8bit彩色
MOV WORD [SCRNX], 320
MOV WORD [SCRNY], 200
MOV DWORD[VRAM], 0x000a0000
; 通过BIOS调用获取键盘状态
MOV AH, 0x02
INT 0x16
MOV [LEDS], AL
; we well explain the following code later!!!
; PIC‚ªˆêØ‚ÌŠ„‚èž‚Ý‚ðŽó‚¯•t‚¯‚È‚¢‚悤‚É‚·‚é
; ATŒÝŠ·‹@‚ÌŽd—l‚Å‚ÍAPIC‚̉Šú‰»‚ð‚·‚é‚È‚çA
; ‚±‚¢‚‚ðCLI‘O‚É‚â‚Á‚Ä‚¨‚©‚È‚¢‚ÆA‚½‚܂Ƀnƒ“ƒOƒAƒbƒv‚·‚é
; PIC‚̉Šú‰»‚Í‚ ‚Æ‚Å‚â‚é
MOV AL,0xff
OUT 0x21,AL
NOP ; OUT–½—ß‚ð˜A‘±‚³‚¹‚é‚Æ‚¤‚Ü‚‚¢‚©‚È‚¢‹@Ží‚ª‚ ‚é‚炵‚¢‚Ì‚Å
OUT 0xa1,AL
CLI ; ‚³‚ç‚ÉCPUƒŒƒxƒ‹‚Å‚àŠ„‚èž‚Ý‹ÖŽ~
; CPU‚©‚ç1MBˆÈã‚̃ƒ‚ƒŠ‚ɃAƒNƒZƒX‚Å‚«‚é‚悤‚ÉAA20GATE‚ðÝ’è
CALL waitkbdout
MOV AL,0xd1
OUT 0x64,AL
CALL waitkbdout
MOV AL,0xdf ; enable A20
OUT 0x60,AL
CALL waitkbdout
; ƒvƒƒeƒNƒgƒ‚[ƒhˆÚs
[INSTRSET "i486p"] ; 486‚Ì–½—ß‚Ü‚ÅŽg‚¢‚½‚¢‚Æ‚¢‚¤‹Lq
LGDT [GDTR0] ; Žb’èGDT‚ðÝ’è
MOV EAX,CR0
AND EAX,0x7fffffff ; bit31‚ð0‚É‚·‚éiƒy[ƒWƒ“ƒO‹ÖŽ~‚Ì‚½‚ßj
OR EAX,0x00000001 ; bit0‚ð1‚É‚·‚éiƒvƒƒeƒNƒgƒ‚[ƒhˆÚs‚Ì‚½‚ßj
MOV CR0,EAX
JMP pipelineflush
pipelineflush:
MOV AX,1*8 ; “Ç‚Ý‘‚«‰Â”\ƒZƒOƒƒ“ƒg32bit
MOV DS,AX
MOV ES,AX
MOV FS,AX
MOV GS,AX
MOV SS,AX
; bootpack‚Ì“]‘—
MOV ESI,bootpack ; “]‘—Œ³
MOV EDI,BOTPAK ; “]‘—æ
MOV ECX,512*1024/4
CALL memcpy
; ‚‚¢‚łɃfƒBƒXƒNƒf[ƒ^‚à–{—ˆ‚̈ʒu‚Ö“]‘—
; ‚Ü‚¸‚̓u[ƒgƒZƒNƒ^‚©‚ç
MOV ESI,0x7c00 ; “]‘—Œ³
MOV EDI,DSKCAC ; “]‘—æ
MOV ECX,512/4
CALL memcpy
; Žc‚è‘S•”
MOV ESI,DSKCAC0+512 ; “]‘—Œ³
MOV EDI,DSKCAC+512 ; “]‘—æ
MOV ECX,0
MOV CL,BYTE [CYLS]
IMUL ECX,512*18*2/4 ; ƒVƒŠƒ“ƒ_”‚©‚çƒoƒCƒg”/4‚É•ÏŠ·
SUB ECX,512/4 ; IPL‚Ì•ª‚¾‚¯·‚µˆø‚
CALL memcpy
; asmhead‚Å‚µ‚È‚¯‚ê‚΂¢‚¯‚È‚¢‚±‚Æ‚Í‘S•”‚µI‚í‚Á‚½‚Ì‚ÅA
; ‚ ‚Æ‚Íbootpack‚É”C‚¹‚é
; bootpack‚Ì‹N“®
MOV EBX,BOTPAK
MOV ECX,[EBX+16]
ADD ECX,3 ; ECX += 3;
SHR ECX,2 ; ECX /= 4;
JZ skip ; “]‘—‚·‚é‚ׂ«‚à‚Ì‚ª‚È‚¢
MOV ESI,[EBX+20] ; “]‘—Œ³
ADD ESI,EBX
MOV EDI,[EBX+12] ; “]‘—æ
CALL memcpy
skip:
MOV ESP,[EBX+12] ; ƒXƒ^ƒbƒN‰Šú’l
JMP DWORD 2*8:0x0000001b
waitkbdout:
IN AL,0x64
AND AL,0x02
JNZ waitkbdout ; AND‚ÌŒ‹‰Ê‚ª0‚Å‚È‚¯‚ê‚Îwaitkbdout‚Ö
RET
memcpy:
MOV EAX,[ESI]
ADD ESI,4
MOV [EDI],EAX
ADD EDI,4
SUB ECX,1
JNZ memcpy ; ˆø‚«ŽZ‚µ‚½Œ‹‰Ê‚ª0‚Å‚È‚¯‚ê‚Îmemcpy‚Ö
RET
; memcpy‚̓AƒhƒŒƒXƒTƒCƒYƒvƒŠƒtƒBƒNƒX‚ð“ü‚ê–Y‚ê‚È‚¯‚ê‚ÎAƒXƒgƒŠƒ“ƒO–½—ß‚Å‚à‘‚¯‚é
ALIGNB 16
GDT0:
RESB 8 ; ƒkƒ‹ƒZƒŒƒNƒ^
DW 0xffff,0x0000,0x9200,0x00cf ; “Ç‚Ý‘‚«‰Â”\ƒZƒOƒƒ“ƒg32bit
DW 0xffff,0x0000,0x9a28,0x0047 ; ŽÀs‰Â”\ƒZƒOƒƒ“ƒg32bitibootpack—pj
DW 0
GDTR0:
DW 8*3-1
DD GDT0
ALIGNB 16
bootpack: