http://www.cnblogs.com/ljf9201314/archive/2008/07/21/1247653.html

BIOS?INT?10-13功能調(diào)用的“另類”玩法
Native?API、Win32?API?或是早年間學(xué)習匯編時接觸的?DOS?int?21?都不如?BIOS?的中斷調(diào)用來的直接。
閑暇之余，學(xué)寫寫B(tài)IOS的調(diào)用代碼也還是很好玩的，反正我很喜歡。
還有，現(xiàn)在越來越佩服寫B(tài)IOS的人了～
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今天的代碼是吃中飯后，瞇午覺前寫的。沒有技術(shù)含量，權(quán)當是準備迎第23個中秋節(jié)～
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原來我在實驗?BIOS?int?10號中斷-13號功能調(diào)用?"AL寫模式位"?的時候都是采用?"bit?1位"?置0的方法。而這帶來的后果就是? ——?某字符串中的每一個字符都(不得不)具有同樣的顏色屬性?——?如果我想讓字符串里第一個字符是藍色，第二個字符是紅色是沒有辦法實現(xiàn)的。所以，這 對于“非標準方法愛好者”來說是很不爽的～?
So，修改之。只要?"AL寄存器?bit?1位"?置1，且字符串包含交替的字符和屬性就可以了，小玩意～?正好夠一個中午的時間。
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先來一些“教條”做背景：
在Ralf?Brown前輩的《Interrupt?List》是這么描述?BIOS?INT?10-13的
---------------------------------------------------------------
INT?10?13--?-?VIDEO?-?WRITE?STRING?(AT?and?later,EGA)
Inp.:
?AH?=?13h
?AL?=?write?mode
????bit?0:?update?cursor?after?writing
????bit?1:?string?contains?alternating?characters?and?attributes
????bits?2-7:?reserved?(0)
?BH?=?page?number
?BL?=?attribute?if?string?contains?only?characters
?CX?=?number?of?characters?in?string
?DH,DL?=?row,column?at?which?to?start?writing
?ES:BP?->?string?to?write
Return:??nothing
Notes:???recognizes?CR,?LF,?BS,?and?bell;?for?the?ET4000?BIOS,?scrolling,
?????????backspace,?and?CR?only?take?place?in?the?active?page
?????????also?available?PC?or?XT?with?EGA?or?higher
?????????HP?95LX?only?supports?write?mode?00h
?????????IBM?documents?AL=10h,11h,20h,21h?as?"private"?rather?than?"reserved"
BUG:?????on?the?IBM?VGA?Adapter,?any?scrolling?which?may?occur?is?performed?on
?????????the?active?page?rather?than?the?requested?page
SeeAlso:?AH=09h,AH=0Ah,AH=13h"DOS/V"
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[代碼及玩法如下]
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將代碼編譯成Bin文件后，讀寫引導(dǎo)扇區(qū)并做成虛擬軟盤鏡像，在Bochs或VMWare中啟動，就能看到效果了
(就像tiamo前輩所說的那樣，在有源代碼的情況下，合格的程序員不應(yīng)該被編譯/編譯選項難倒～)
PS:?代碼里還用到了?BIOS?INT?10號中斷-06號功能調(diào)用?——?清屏(屏幕向上滾動)
;?============================================?;
;????????????.:??keenjoy95?2007??:.????????????;
;??????.:??keenjoy95_at_gmail_dot_com??:.??????;
;?--------------------------------------------?;
;?代碼描述??:??引導(dǎo)扇區(qū)演示程序????????????????;
;?編譯方法??:??nasm??boot.asm?-o?boot.bin??????;
;?============================================?;
?????????????????????????????????????;?為了對齊的美觀,?下面的代碼向前進縮了一些...
????????org?????07c00h???????????????;?ORG偽指令也被稱為程序起始地址偽指令?/?定位偽指令
?????????????????????????????????????;?該偽指令用于指示編譯器(鏈接器)將其后續(xù)代碼(段)定位于指定地址
?????????????????????????????????????;?由于本示例是引導(dǎo)扇區(qū)演示程序，所以目標定位地址為0000:7c00h
????????jmp?????MYOS_ENTRY???????????;?無條件跳轉(zhuǎn)到程序的入口點MYOS_ENTRY標號處
BootMessage:
????????db??????0x07?????????????????;?"Beep"
????????dw??????0x1048???????????????;?"H"???(藍底??黑字)
????????dw??????0x1465???????????????;?"e"???(藍底??紅字)
????????dw??????0x1f6c???????????????;?"l"???(藍底??白字)
????????dw??????0x126c???????????????;?"l"???(藍底??綠字)
????????dw??????0x166f???????????????;?"o"???(藍底??棕字)
????????dw??????0xfc2c???????????????;?","???(白底淺紅字)
????????dw??????0xf020???????????????;?"?"???(白底??黑字)
????????dw??????0x4b4d???????????????;?"M"???(紅底淺青字)
????????dw??????0x4179???????????????;?"y"???(紅底??藍字)
????????dw??????0x404f???????????????;?"O"???(紅底??黑字)
????????dw??????0x4f53???????????????;?"S"???(紅底??白字)
????????dw??????0x4c21???????????????;?"!"???(紅底淺紅字)
????????db??????0x07?????????????????;?"Beep"
ScrollWindows:
????????mov?????ax,?0600h????????????;?AH?賦值為功能號06h(窗口上滾)???????(BIOS?INT?10-06h?定義參數(shù))
?????????????????????????????????????;?AL?賦值為0,?窗口信息全部移出(清屏)?(BIOS?INT?10-06h?定義參數(shù))
????????mov?????bx,?0700h????????????;?BH?底部空白行屬性賦值為黑底灰白字??(BIOS?INT?10-06h?定義參數(shù))
?????????????????????????????????????;?BL?保留
????????mov?????cx,?0000h????????????;?窗口左上角的行列、號賦值為00h?00h??(BIOS?INT?10-06h?定義參數(shù))
????????mov?????dx,?184fh????????????;?窗口右下角的行列、號賦值為18h?4fh??(BIOS?INT?10-06h?定義參數(shù))
?????????????????????????????????????;?????---------------------------------------------------
?????????????????????????????????????;??????????????0(00h)??????????????????????79(4fh)
?????????????????????????????????????;???????0(00h)┏━━━━━━━━━━━━━━━━┓
?????????????????????????????????????;?????????????┃????????????????????????????????┃
?????????????????????????????????????;?????????????┃????????????????????????????????┃
?????????????????????????????????????;?????????????┃????????????????????????????????┃
?????????????????????????????????????;?????????????┃?????顯示器??25*80?顯示方式?????┃
?????????????????????????????????????;?????????????┃????????????????????????????????┃
?????????????????????????????????????;?????????????┃????????????????????????????????┃
?????????????????????????????????????;?????????????┃????????????????????????????????┃
?????????????????????????????????????;??????24(18h)┗━━━━━━━━━━━━━━━━┛
?????????????????????????????????????;
????????int?????10h??????????????????;?BIOS?10h號中斷-06h號功能???????????(清屏功能調(diào)用)
????????ret??????????????????????????;?子程序無參數(shù)返回
DisplayString:
????????mov?????ax,?BootMessage??????;?取字符串數(shù)據(jù)(段)的首地址
????????mov?????bp,?ax???????????????;?ES:BP?賦值為待顯示字符串的首地址???(BIOS?INT?10-13h?定義參數(shù))
????????mov?????cx,?14???????????????;?CX?賦值為字符串長度(此處為固定值)??(BIOS?INT?10-13h?定義參數(shù))
????????mov?????ax,?01303h???????????;?AH?賦值為功能號13h(顯示字符串)?????(BIOS?INT?10-13h?定義參數(shù))
?????????????????????????????????????;?AL?輸出模式參數(shù)賦值為03h???????????(BIOS?INT?10-13h?定義參數(shù))
?????????????????????????????????????;?????---------------------------------------------------
?????????????????????????????????????;?????第?0?位?:?在輸出之后更新光標位置
?????????????????????????????????????;?????第?1?位?:?字符串包含交替的字符和屬性
?????????????????????????????????????;
????????mov?????bx,?0000h????????????;?BH?頁號賦值為0?????????????????????(BIOS?INT?10-13h?定義參數(shù))
?????????????????????????????????????;?BL?屬性賦值為黑底淺紅字(屬性字BL使用的前提為AL的高位置0)
?????????????????????????????????????;??????---------------------------------------------------
?????????????????????????????????????;????16位色彩編碼表?(D7?D6?D5?D4為背景色,D3?D2?D1?D0為前景色)
?????????????????????????????????????;???????┏━━━━━━━━━━━┳━━━━━━━━━━━┓
?????????????????????????????????????;???????┃???0?0?0?0?????黑?????┃???1?0?0?0??????灰????┃
?????????????????????????????????????;???????┃???0?0?0?1?????藍?????┃???1?0?0?1?????淺藍???┃
?????????????????????????????????????;???????┃???0?0?1?0?????綠?????┃???1?0?1?0?????淺綠???┃
?????????????????????????????????????;???????┃???0?0?1?1?????青?????┃???1?0?1?1?????淺青???┃
?????????????????????????????????????;???????┃???0?1?0?0?????紅?????┃???1?1?0?0?????淺紅???┃
?????????????????????????????????????;???????┃???0?1?0?1????品紅????┃???1?1?0?1????淺品紅??┃
?????????????????????????????????????;???????┃???0?1?1?0?????棕?????┃???1?1?1?0??????黃????┃
?????????????????????????????????????;???????┃???0?1?1?1????灰白????┃???1?1?1?1??????白????┃
?????????????????????????????????????;???????┗━━━━━━━━━━━┻━━━━━━━━━━━┛
?????????????????????????????????????;
????????mov?????dx,?0000h????????????;?DL?賦值為字符串顯示的起始行、列號??(BIOS?INT?10-13h?定義參數(shù))
????????int?????10h??????????????????;?BIOS?10h號中斷-13h號功能???????????(字符串屏顯功能調(diào)用)
????????ret??????????????????????????;?子程序無參數(shù)返回
MYOS_ENTRY:
????????mov?????ax,?cs???????????????;?┓
????????mov?????ds,?ax???????????????;?┣?段寄存器初始化
????????mov?????es,?ax???????????????;?┛
????????call????ScrollWindows????????;?調(diào)用清屏子程序
????????call????DisplayString????????;?調(diào)用字符串顯示子程序
????????jmp?????$????????????????????;?主程序進入無限循環(huán)
MYOS_PAD:
????????times???510-($-$$)???db???0??;?循環(huán)填充剩余空間，使生成的二進制代碼大小恰好為一個扇區(qū)(512Byte)
????????dw??????0xAA55???????????????;?引導(dǎo)扇區(qū)結(jié)束標志
;?---8<-----------?[Cut?Here]?----------->8---?;
;????????????.:??keenjoy95?2007??:.????????????;
;??????.:??keenjoy95_at_gmail_dot_com??:.??????;
;????????????!?NO?rights?reserved?!????????????;
;?--------------------------------------------?;
?
如你所見，每一個輸出的字符都可以擁有不同的“背景色”和“前景色”～
代碼的注釋里我給出了16位的色彩編碼表。
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然后(也就是現(xiàn)在)，小的我瞇過午覺了～
再反匯編學(xué)習一下，我知道這個很“弱智”，不過～人嘛，都是從弱智開始的，更何況ndisasm反匯編功能更弱智～??:P
?
;?====================================================?;
;????????????????.:??keenjoy95?2007??:.????????????????;
;??????????.:??keenjoy95_at_gmail_dot_com??:.??????????;
;?----------------------------------------------------?;
;?代碼描述??:??引導(dǎo)扇區(qū)演示程序反匯編??????????????????;
;?逆向方法??:??????????????????????????????????????????;
;???????????ndisasm??-o?0x7c00?boot.bin?>>?disboot.asm?;
;????ndisasm?-o?0x7c00?-k?3,26?boot.bin?>>?disboot.asm?;
;?====================================================?;
00007C00??E93D00????????????jmp?0x7c40?????????????????;?無條件跳轉(zhuǎn)到程序的入口點
???????????????????????????????????????????????????????;?跳轉(zhuǎn)的指令是"E9?3D00"?(地址偏移是003D,?向后
???????????????????????????????????????????????????????;?跳61D/0x3DH個字節(jié))
;------------------------------------------------------;
;??????????*?下面是錯誤的反匯編?——?數(shù)據(jù)段?*??????????;
;------------------------------------------------------;?"Hello,?MyOS!"
00007C03??07????????????????pop?es?????????????????????;?"Beep"
00007C04??48????????????????dec?ax?????????????????????;?"H"
00007C05??106514????????????adc?[di+0x14],ah???????????;?(0x10)?|?"e"?|?(0x14)
00007C08??6C????????????????insb???????????????????????;?"l"
00007C09??1F????????????????pop?ds?????????????????????;?(0x1f)
00007C0A??6C????????????????insb???????????????????????;?"l"
00007C0B??126F16????????????adc?ch,[bx+0x16]???????????;?(0x12)?|?"o"?|?(0x16)
00007C0E??2CFC??????????????sub?al,0xfc????????????????;?","?|?(0xfc)
00007C10??20F0??????????????and?al,dh??????????????????;?"?"?|?(0xf0)
00007C12??4D????????????????dec?bp?????????????????????;?"M"
00007C13??4B????????????????dec?bx?????????????????????;?(0x4b)
00007C14??7941??????????????jns?0x7c57?????????????????;?"y"?|?(0x41)
00007C16??4F????????????????dec?di?????????????????????;?"O"
00007C17??40????????????????inc?ax?????????????????????;?(0x40)
00007C18??53????????????????push?bx????????????????????;?"S"
00007C19??4F????????????????dec?di?????????????????????;?(0x4f)
00007C1A??214C07????????????and?[si+0x7],cx????????????;?"!"?|?(0x4c)?|?"Beep"
;------------------------------------------------------;
;?????????????????????*?代?碼?段?*?????????????????????;
;------------------------------------------------------;
00007C1D??B80006????????????mov?ax,0x600???????????????;?┓
00007C20??BB0007????????????mov?bx,0x700???????????????;?┃
00007C23??B90000????????????mov?cx,0x0?????????????????;?┣?清屏子程序
00007C26??BA4F18????????????mov?dx,0x184f??????????????;?┃
00007C29??CD10??????????????int?0x10???????????????????;?┛
00007C2B??C3????????????????ret????????????????????????;?子程序無參數(shù)返回
00007C2C??B8037C????????????mov?ax,0x7c03??????????????;?┓
00007C2F??89C5??????????????mov?bp,ax??????????????????;?┃
00007C31??B90E00????????????mov?cx,0xe?????????????????;?┃
00007C34??B80313????????????mov?ax,0x1303??????????????;?┣?字符串顯示子程序
00007C37??BB0000????????????mov?bx,0x0?????????????????;?┃
00007C3A??BA0000????????????mov?dx,0x0?????????????????;?┃
00007C3D??CD10??????????????int?0x10???????????????????;?┛
00007C3F??C3????????????????ret????????????????????????;?子程序無參數(shù)返回
00007C40??8CC8??????????????mov?ax,cs??????????????????;?┓
00007C42??8ED8??????????????mov?ds,ax??????????????????;?┣?段寄存器初始化
00007C44??8EC0??????????????mov?es,ax??????????????????;?┛
00007C46??E8D4FF????????????call?0x7c1d????????????????;?跳轉(zhuǎn)的指令是"E8?D4FF"?(地址偏移是FFD4,?向前
???????????????????????????????????????????????????????;?跳44D/0x2CH個字節(jié))
00007C49??E8E0FF????????????call?0x7c2c????????????????;?跳轉(zhuǎn)的指令是"E8?E0FF"?(地址偏移是FFE0,?向前
???????????????????????????????????????????????????????;?跳32D/0x20H個字節(jié))
00007C4C??EBFE??????????????jmp?short?0x7c4c???????????;?主程序進入無限循環(huán)
???????????????????????????????????????????????????????;?跳轉(zhuǎn)的指令是"E8?FE"???(地址偏移是00FE,?向前
???????????????????????????????????????????????????????;?跳2D個字節(jié),?進入死循環(huán))
;------------------------------------------------------;
;??*?下面是錯誤的反匯編?——?引導(dǎo)區(qū)填充段及結(jié)束標志?*??;
;------------------------------------------------------;
00007C4E??0000??????????????add?[bx+si],al
00007C50??0000??????????????add?[bx+si],al
00007C52??0000??????????????add?[bx+si],al
00007C54??0000??????????????add?[bx+si],al
00007C56??0000??????????????add?[bx+si],al
00007C58??0000??????????????add?[bx+si],al
00007C5A??0000??????????????add?[bx+si],al
00007C5C??0000??????????????add?[bx+si],al
00007C5E??0000??????????????add?[bx+si],al
00007C60??0000??????????????add?[bx+si],al
00007C62??0000??????????????add?[bx+si],al
00007C64??0000??????????????add?[bx+si],al
00007C66??0000??????????????add?[bx+si],al
00007C68??0000??????????????add?[bx+si],al
00007C6A??0000??????????????add?[bx+si],al
00007C6C??0000??????????????add?[bx+si],al
00007C6E??0000??????????????add?[bx+si],al
00007C70??0000??????????????add?[bx+si],al
00007C72??0000??????????????add?[bx+si],al
00007C74??0000??????????????add?[bx+si],al
00007C76??0000??????????????add?[bx+si],al
00007C78??0000??????????????add?[bx+si],al
00007C7A??0000??????????????add?[bx+si],al
00007C7C??0000??????????????add?[bx+si],al
00007C7E??0000??????????????add?[bx+si],al
00007C80??0000??????????????add?[bx+si],al
00007C82??0000??????????????add?[bx+si],al
00007C84??0000??????????????add?[bx+si],al
00007C86??0000??????????????add?[bx+si],al
00007C88??0000??????????????add?[bx+si],al
00007C8A??0000??????????????add?[bx+si],al
00007C8C??0000??????????????add?[bx+si],al
00007C8E??0000??????????????add?[bx+si],al
00007C90??0000??????????????add?[bx+si],al
00007C92??0000??????????????add?[bx+si],al
00007C94??0000??????????????add?[bx+si],al
00007C96??0000??????????????add?[bx+si],al
00007C98??0000??????????????add?[bx+si],al
00007C9A??0000??????????????add?[bx+si],al
00007C9C??0000??????????????add?[bx+si],al
00007C9E??0000??????????????add?[bx+si],al
00007CA0??0000??????????????add?[bx+si],al
00007CA2??0000??????????????add?[bx+si],al
00007CA4??0000??????????????add?[bx+si],al
00007CA6??0000??????????????add?[bx+si],al
00007CA8??0000??????????????add?[bx+si],al
00007CAA??0000??????????????add?[bx+si],al
00007CAC??0000??????????????add?[bx+si],al
00007CAE??0000??????????????add?[bx+si],al
00007CB0??0000??????????????add?[bx+si],al
00007CB2??0000??????????????add?[bx+si],al
00007CB4??0000??????????????add?[bx+si],al
00007CB6??0000??????????????add?[bx+si],al
00007CB8??0000??????????????add?[bx+si],al
00007CBA??0000??????????????add?[bx+si],al
00007CBC??0000??????????????add?[bx+si],al
00007CBE??0000??????????????add?[bx+si],al
00007CC0??0000??????????????add?[bx+si],al
00007CC2??0000??????????????add?[bx+si],al
00007CC4??0000??????????????add?[bx+si],al
00007CC6??0000??????????????add?[bx+si],al
00007CC8??0000??????????????add?[bx+si],al
00007CCA??0000??????????????add?[bx+si],al
00007CCC??0000??????????????add?[bx+si],al
00007CCE??0000??????????????add?[bx+si],al
00007CD0??0000??????????????add?[bx+si],al
00007CD2??0000??????????????add?[bx+si],al
00007CD4??0000??????????????add?[bx+si],al
00007CD6??0000??????????????add?[bx+si],al
00007CD8??0000??????????????add?[bx+si],al
00007CDA??0000??????????????add?[bx+si],al
00007CDC??0000??????????????add?[bx+si],al
00007CDE??0000??????????????add?[bx+si],al
00007CE0??0000??????????????add?[bx+si],al
00007CE2??0000??????????????add?[bx+si],al
00007CE4??0000??????????????add?[bx+si],al
00007CE6??0000??????????????add?[bx+si],al
00007CE8??0000??????????????add?[bx+si],al
00007CEA??0000??????????????add?[bx+si],al
00007CEC??0000??????????????add?[bx+si],al
00007CEE??0000??????????????add?[bx+si],al
00007CF0??0000??????????????add?[bx+si],al
00007CF2??0000??????????????add?[bx+si],al
00007CF4??0000??????????????add?[bx+si],al
00007CF6??0000??????????????add?[bx+si],al
00007CF8??0000??????????????add?[bx+si],al
00007CFA??0000??????????????add?[bx+si],al
00007CFC??0000??????????????add?[bx+si],al
00007CFE??0000??????????????add?[bx+si],al
00007D00??0000??????????????add?[bx+si],al
00007D02??0000??????????????add?[bx+si],al
00007D04??0000??????????????add?[bx+si],al
00007D06??0000??????????????add?[bx+si],al
00007D08??0000??????????????add?[bx+si],al
00007D0A??0000??????????????add?[bx+si],al
00007D0C??0000??????????????add?[bx+si],al
00007D0E??0000??????????????add?[bx+si],al
00007D10??0000??????????????add?[bx+si],al
00007D12??0000??????????????add?[bx+si],al
00007D14??0000??????????????add?[bx+si],al
00007D16??0000??????????????add?[bx+si],al
00007D18??0000??????????????add?[bx+si],al
00007D1A??0000??????????????add?[bx+si],al
00007D1C??0000??????????????add?[bx+si],al
00007D1E??0000??????????????add?[bx+si],al
00007D20??0000??????????????add?[bx+si],al
00007D22??0000??????????????add?[bx+si],al
00007D24??0000??????????????add?[bx+si],al
00007D26??0000??????????????add?[bx+si],al
00007D28??0000??????????????add?[bx+si],al
00007D2A??0000??????????????add?[bx+si],al
00007D2C??0000??????????????add?[bx+si],al
00007D2E??0000??????????????add?[bx+si],al
00007D30??0000??????????????add?[bx+si],al
00007D32??0000??????????????add?[bx+si],al
00007D34??0000??????????????add?[bx+si],al
00007D36??0000??????????????add?[bx+si],al
00007D38??0000??????????????add?[bx+si],al
00007D3A??0000??????????????add?[bx+si],al
00007D3C??0000??????????????add?[bx+si],al
00007D3E??0000??????????????add?[bx+si],al
00007D40??0000??????????????add?[bx+si],al
00007D42??0000??????????????add?[bx+si],al
00007D44??0000??????????????add?[bx+si],al
00007D46??0000??????????????add?[bx+si],al
00007D48??0000??????????????add?[bx+si],al
00007D4A??0000??????????????add?[bx+si],al
00007D4C??0000??????????????add?[bx+si],al
00007D4E??0000??????????????add?[bx+si],al
00007D50??0000??????????????add?[bx+si],al
00007D52??0000??????????????add?[bx+si],al
00007D54??0000??????????????add?[bx+si],al
00007D56??0000??????????????add?[bx+si],al
00007D58??0000??????????????add?[bx+si],al
00007D5A??0000??????????????add?[bx+si],al
00007D5C??0000??????????????add?[bx+si],al
00007D5E??0000??????????????add?[bx+si],al
00007D60??0000??????????????add?[bx+si],al
00007D62??0000??????????????add?[bx+si],al
00007D64??0000??????????????add?[bx+si],al
00007D66??0000??????????????add?[bx+si],al
00007D68??0000??????????????add?[bx+si],al
00007D6A??0000??????????????add?[bx+si],al
00007D6C??0000??????????????add?[bx+si],al
00007D6E??0000??????????????add?[bx+si],al
00007D70??0000??????????????add?[bx+si],al
00007D72??0000??????????????add?[bx+si],al
00007D74??0000??????????????add?[bx+si],al
00007D76??0000??????????????add?[bx+si],al
00007D78??0000??????????????add?[bx+si],al
00007D7A??0000??????????????add?[bx+si],al
00007D7C??0000??????????????add?[bx+si],al
00007D7E??0000??????????????add?[bx+si],al
00007D80??0000??????????????add?[bx+si],al
00007D82??0000??????????????add?[bx+si],al
00007D84??0000??????????????add?[bx+si],al
00007D86??0000??????????????add?[bx+si],al
00007D88??0000??????????????add?[bx+si],al
00007D8A??0000??????????????add?[bx+si],al
00007D8C??0000??????????????add?[bx+si],al
00007D8E??0000??????????????add?[bx+si],al
00007D90??0000??????????????add?[bx+si],al
00007D92??0000??????????????add?[bx+si],al
00007D94??0000??????????????add?[bx+si],al
00007D96??0000??????????????add?[bx+si],al
00007D98??0000??????????????add?[bx+si],al
00007D9A??0000??????????????add?[bx+si],al
00007D9C??0000??????????????add?[bx+si],al
00007D9E??0000??????????????add?[bx+si],al
00007DA0??0000??????????????add?[bx+si],al
00007DA2??0000??????????????add?[bx+si],al
00007DA4??0000??????????????add?[bx+si],al
00007DA6??0000??????????????add?[bx+si],al
00007DA8??0000??????????????add?[bx+si],al
00007DAA??0000??????????????add?[bx+si],al
00007DAC??0000??????????????add?[bx+si],al
00007DAE??0000??????????????add?[bx+si],al
00007DB0??0000??????????????add?[bx+si],al
00007DB2??0000??????????????add?[bx+si],al
00007DB4??0000??????????????add?[bx+si],al
00007DB6??0000??????????????add?[bx+si],al
00007DB8??0000??????????????add?[bx+si],al
00007DBA??0000??????????????add?[bx+si],al
00007DBC??0000??????????????add?[bx+si],al
00007DBE??0000??????????????add?[bx+si],al
00007DC0??0000??????????????add?[bx+si],al
00007DC2??0000??????????????add?[bx+si],al
00007DC4??0000??????????????add?[bx+si],al
00007DC6??0000??????????????add?[bx+si],al
00007DC8??0000??????????????add?[bx+si],al
00007DCA??0000??????????????add?[bx+si],al
00007DCC??0000??????????????add?[bx+si],al
00007DCE??0000??????????????add?[bx+si],al
00007DD0??0000??????????????add?[bx+si],al
00007DD2??0000??????????????add?[bx+si],al
00007DD4??0000??????????????add?[bx+si],al
00007DD6??0000??????????????add?[bx+si],al
00007DD8??0000??????????????add?[bx+si],al
00007DDA??0000??????????????add?[bx+si],al
00007DDC??0000??????????????add?[bx+si],al
00007DDE??0000??????????????add?[bx+si],al
00007DE0??0000??????????????add?[bx+si],al
00007DE2??0000??????????????add?[bx+si],al
00007DE4??0000??????????????add?[bx+si],al
00007DE6??0000??????????????add?[bx+si],al
00007DE8??0000??????????????add?[bx+si],al
00007DEA??0000??????????????add?[bx+si],al
00007DEC??0000??????????????add?[bx+si],al
00007DEE??0000??????????????add?[bx+si],al
00007DF0??0000??????????????add?[bx+si],al
00007DF2??0000??????????????add?[bx+si],al
00007DF4??0000??????????????add?[bx+si],al
00007DF6??0000??????????????add?[bx+si],al
00007DF8??0000??????????????add?[bx+si],al
00007DFA??0000??????????????add?[bx+si],al
00007DFC??0000??????????????add?[bx+si],al
00007DFE??55????????????????push?bp????????????????????;?引導(dǎo)扇區(qū)結(jié)束標志位1
00007DFF??AA????????????????stosb??????????????????????;?引導(dǎo)扇區(qū)結(jié)束標志位2
;?---8<---------------?[Cut?Here]?--------------->8---?;
;????????????????.:??keenjoy95?2007??:.????????????????;
;??????????.:??keenjoy95_at_gmail_dot_com??:.??????????;
;????????????????!?NO?rights?reserved?!????????????????;
;?----------------------------------------------------?;
?
?
[附?:?常見的?BIOS?int?10號中斷-13號功能調(diào)用的寫法]
--------------------------------------------------
下面是代碼片斷，字符串?"Hello,?MyOS?world!"?具有統(tǒng)一的顏色熟悉0x0c(黑底淺紅字)。
?
BootMessage:
????????db??????"Hello,?MyOS?world!"?;?待顯示字符串信息
DisplayString:
????????mov?????ax,?BootMessage??????;?取字符串數(shù)據(jù)(段)的首地址
????????mov?????bp,?ax???????????????;?ES:BP?賦值為待顯示字符串的首地址???(BIOS?INT?10h?定義參數(shù))
????????mov?????cx,?18???????????????;?CX?賦值為字符串長度(此處為固定值)??(BIOS?INT?10h?定義參數(shù))
????????mov?????ax,?01301h???????????;?AH?賦值為功能號13h(顯示字符串)?????(BIOS?INT?10h?定義參數(shù))
?????????????????????????????????????;?AL?輸出模式參數(shù)賦值為01h???????????(BIOS?INT?10h?定義參數(shù))
?????????????????????????????????????;?????---------------------------------------------------
?????????????????????????????????????;?????第?0?位?:?在輸出之后更新光標位置
?????????????????????????????????????;?????第?1?位?:?字符串包含交替的字符和屬性
?????????????????????????????????????;
????????mov?????bx,?000ch????????????;?BH?頁號賦值為0?????????????????????(BIOS?INT?10h?定義參數(shù))
?????????????????????????????????????;?BL?屬性賦值為黑底淺紅字(屬性字BL使用的前提為AL的高位置0)
?????????????????????????????????????;?????---------------------------------------------------
?????????????????????????????????????;?????16位色彩編碼表?(D7?D6?D5?D4為背景色,D3?D2?D1?D0為前景色)
?????????????????????????????????????;????????┏━━━━━━━━━━━┳━━━━━━━━━━━┓
?????????????????????????????????????;????????┃???0?0?0?0?????黑?????┃???1?0?0?0??????灰????┃
?????????????????????????????????????;????????┃???0?0?0?1?????藍?????┃???1?0?0?1?????淺藍???┃
?????????????????????????????????????;????????┃???0?0?1?0?????綠?????┃???1?0?1?0?????淺綠???┃
?????????????????????????????????????;????????┃???0?0?1?1?????青?????┃???1?0?1?1?????淺青???┃
?????????????????????????????????????;????????┃???0?1?0?0?????紅?????┃???1?1?0?0?????淺紅???┃
?????????????????????????????????????;????????┃???0?1?0?1????品紅????┃???1?1?0?1????淺品紅??┃
?????????????????????????????????????;????????┃???0?1?1?0?????棕?????┃???1?1?1?0??????黃????┃
?????????????????????????????????????;????????┃???0?1?1?1????灰白????┃???1?1?1?1??????白????┃
?????????????????????????????????????;????????┗━━━━━━━━━━━┻━━━━━━━━━━━┛
?????????????????????????????????????;
????????mov?????dx,?0000h????????????;?DL?賦值為字符串顯示的起始行?/?列號?(BIOS?INT?10h?定義參數(shù))
????????int?????10h??????????????????;?BIOS?10h號中斷-13h號功能???????????(字符串屏顯功能調(diào)用)
????????ret??????????????????????????;?子程序無參數(shù)返回

總結(jié)

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