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1. Ö÷Òýµ¼¼Ç¼´úÂë

; ÎļþÃû boot.asm

org 7c00h ; BIOS¶ÁÈëMBRºó£¬´Ó0x7c00h´¦¿ªÊ¼Ö´ÐÐ

; ÏÂÃæ²¿·ÖºÍ10hÓйØÖжϣ¬10hÖжÏÓÃÀ´ÏÔʾ×Ö·û
mov ax, cs
mov es, ax
mov ax, msg
mov bp, ax ; ES:BP±íʾÏÔʾ×Ö·û´®µÄµØÖ·
mov cx, msgLen ; CX´æ×Ö·û³¤¶È
mov ax, 1301h ; AH=13h±íʾÏòTTYÏÔʾ×Ö·û£¬AL=01h±íʾÏÔʾ·½Ê½£¨×Ö·û´®ÊÇ·ñ°üº¬ÏÔʾÊôÐÔ£¬01h±íʾ²»°üº¬£©
mov bx, 000fh ; BH=00h±íʾҳºÅ£¬BL=0fh±íʾÑÕÉ«
mov dl, 0 ; ÁÐ
int 10h

msg: db "hello world, welcome to OS!"
msgLen: equ $ - msg ; ×Ö·û´®³¤¶È
times 510 - ($ - $$) db 0 ; Ìî³äÊ£Óಿ·Ö
dw 0aa55h ; ħÊý£¬±ØÐëÓÐÕâÁ½¸ö×Ö½ÚBIOS²ÅÈ·ÈÏÊÇMBR

2. ±àÒë

# nasm boot.asm -o boot.bin

Èç¹ûûÓÐnasm£¬°²×°Ëü sudo apt-get install nasm, Ö´ÐÐÍêÉÏÊöÃüÁ»áÉú³Éboot.binÎļþ£¬Õâ¾ÍÊÇÎÒÃǵÄÖ÷Òýµ¼¼Ç¼¶þ½øÖÆ¡£

µÚËÄ½Ú ´úÂë½âÊÍ

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1. ΪʲôMBRÒª´Ó0x7c00h´¦¿ªÊ¼Ö´ÐУ¿

ORGÊÇαָÁorg 7c00hÊǸæËß±àÒëÆ÷£¬ÏÂÃæ´úÂë×°Èëµ½ÄÚ´æµÄÆðʼµØÖ·0x7c00h´¦¡£ÎªÊ²Ã´ÄØ£¬ÕâÊÇÒòΪBIOS¶ÁÈ¡Ö÷Òýµ¼¼Ç¼ºó£¬»á´Ó0x7c00h´¦¿ªÊ¼Ö´ÐУ¬ÄÇôBIOSΪʲô»á´Ó0x7c00hÕâ¸öµØÖ·¿ªÊ¼Ö´ÐУ¬¶ø²»ÊÇÆäËûµØÖ·ÄØ£¬ÕâÒ»Çж¼Òª´Ó´óÃ÷ºþÅϵÄ8086cpu˵Æð¡£

ʱ¹â·ÉÊÅ£¬ÈÝÑÕÒ×ÀÏ£¬8086È´»¹ÊÇÄǸöÑù×Ó£¬ÈçͼËùʾ£º

ͼ 8086ʵÎïͼ

ͼ 8086Òý½Åͼ

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ͼ ʵģʽÄÚ´æµØÖ·¿Õ¼ä·Ö²¼

¿´µ½0x7c00hÁËÂð£¿0x0000h--0x7c00hÕâÒ»¶Î´æµÄÊÇBIOSÖжÏÏòÁ¿ºÍһЩBIOSÊý¾ÝµÈ£¬ÖÁÓÚµ½µ×ΪʲôÒÔ0x7c00hΪ½ç£¬±¾ÎIJ»×öÌÖÂÛ£¬ÓÐÐËȤ¿´ÕâÀïhttp://www.glamenv-septzen.net/en/view/6¡£

2. int 10hÊǸÉÂïµÄ?

µ±³öÏÖint 10hÖжÏʱ£¬±íʾҪ²Ù×÷ÏÔʾÆ÷ÁË£¬´ËʱAH¼Ä´æÆ÷±íʾÈçºÎÏÔʾ£¬´úÂëÖеÄAHΪ13h£¬±íʾҪÔÚTTY£¨Î±ÖÕ¶Ë£©ÏÔʾ×Ö·û£¬´ËʱÆäËû¼¸¸ö¼Ä´æÆ÷¶¼ÓÐÒ»¶¨µÄº¬Ò壬ÈçÏÂËùʾ£º

µ±³öÏÖint 10hÖжÏʱ£¬±íʾҪ²Ù×÷ÏÔʾÆ÷ÁË£¬´ËʱAH¼Ä´æÆ÷±íʾÈçºÎÏÔʾ£¬´úÂëÖеÄAHΪ13h£¬±íʾҪÔÚTTY£¨Î±ÖÕ¶Ë£©ÏÔʾ×Ö·û£¬´ËʱÆäËû¼¸¸ö¼Ä´æÆ÷¶¼ÓÐÒ»¶¨µÄº¬Ò壬ÈçÏÂËùʾ£º

ES:BP -- ÏÔʾ×Ö·û´®µÄµØÖ·¡¡¡¡¡¡¡¡CX -- ÏÔʾ×Ö·û´®µÄ³¤¶È

BH -- Ò³Âë¡¡¡¡¡¡¡¡ BL -- ÊôÐÔ(ÈôAL=00H»ò 01H)

DH -- ÐÐ ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ DL -- ÁÐ

AL -- ÏÔʾÊä³ö·½Ê½

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mov ax, cs
mov es, ax
mov ax, msg
mov bp, ax ; ES:BP±íʾÏÔʾ×Ö·û´®µÄµØÖ·
mov cx, msgLen ; CX´æ×Ö·û³¤¶È
mov ax, 1301h ; AH=13h±íʾÏòTTYÏÔʾ×Ö·û£¬AL=01h±íʾÏÔʾ·½Ê½£¨×Ö·û´®ÊÇ·ñ°üº¬ÏÔʾÊôÐÔ£¬01h±íʾ²»°üº¬£©
mov bx, 000fh ; BH=00h±íʾҳºÅ£¬BL=0fh±íʾÑÕÉ«
mov dl, 0 ; ÁÐ
int 10h

3. $ºÍ$$ÊÇʲôÒâ˼£¿

$ Êǵ±Ç°Î»ÖÃ
$$ ÊǶοªÊ¼Î»ÖÃ

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msgLen: equ $ - msg ; ×Ö·û´®³¤¶È
times 510 - ($ - $$) db 0 ; Ìî³äÊ£Óಿ·Ö

4. ΪʲôҪÓÐ0xaa55hħÊý£¿

BIOS¼ì²éÍêÓ²¼þºó£¬»áѰÕÒÏÂÒ»¸öÉ豸À´Æô¶¯¼ÆËã»ú£¬BIOSÕÒµ½Ò»¸öÉ豸ºó£¬»á¶ÁÈ¡¸ÃÉ豸µÄµÚÒ»¸öÉÈÇø£¬Ò²¾ÍÊǶÁÈ¡×îÇ°ÃæµÄ512¸ö×Ö½Ú¡£Èç¹ûÕâ512¸ö×Ö½ÚµÄ×îºóÁ½¸ö×Ö½ÚÊÇ0x55ºÍ0xAA£¬±íÃ÷Õâ¸öÉ豸¿ÉÒÔÓÃÓÚÆô¶¯£»Èç¹û²»ÊÇ£¬±íÃ÷É豸²»ÄÜÓÃÓÚÆô¶¯£¬¿ØÖÆÈ¨ÓÚÊDZ»×ª½»¸ø"Æô¶¯Ë³Ðò"ÖеÄÏÂÒ»¸öÉ豸¡£

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# dd if=/dev/zero of=empty.img bs=512 count=2880

2. Ö®ºó£¬ÎÒÃÇÖÆ×÷Ò»¸ö°üº¬Ö÷Òýµ¼¼Ç¼boot.binµÄ¾µÏñÎļþlucasOS.img:

# dd if=boot.bin of=lucasOS.img bs=512 count=1

3. È»ºó£¬½«empty.imgÖÐ1¸öÉÈÇøºóµÄÊý¾Ý¿½±´µ½lucasOS.imgµÄºó:

# dd if=empty.img of=lucasOS.img skip=1 seek=1 bs=512 count=2879

ÕâÑù¾Í×ö³ÉÁËÒ»¸ö´óСΪ1.44MbµÄ°üº¬Ö÷Òýµ¼¼Ç¼µÄÈíÅ̾µÏñÎļþlucasOS.img¡£

4. ½«ÐéÄâ»úubuntuÖеÄÎļþlucasOS.img¿½±´µ½windowsÏ£¨Êó±êÖ±½ÓÍÏ×§£¬Èç¹û²»ÐÐgoogleÖ®£©¡£

µÚÁù½Ú ÓÃÈíÅ̾µÏñlucasOS.imgÆô¶¯Ò»¸ö¿ÕµÄÐéÄâ»ú

1. VMware´´½¨¿ÕµÄÐéÄâ»ú£¬È¥µô¿ª»ú´ÓCD/DVDÆô¶¯Ñ¡Ïî¡£¡¡¡¡

2. ÍøÂçÑ¡Ôñhost-onlyģʽ¡£

3. Ñ¡Ôñ´ÓÈíÅÌÇý¶¯£¬Â·¾¶Ñ¡ÔñÉÏÒ»½ÚÒѾ­¿½±´µ½windowsϵľµÏñlucasOS.img.

4. ¿ªÆôÐéÄâ»úµçÔ´£¬¿´µ½ÈçÏ»­Ã棬¹§Ï²Ä㣬³É¹¦ÁË¡£

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±¾ÏµÁÐGitHubµØÖ· https://github.com/lucasysfeng/lucasOS.git

»ñÈ¡´úÂë:

# git clone https://github.com/lucasysfeng/lucasOS.git

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