0x9B000 0x9D800 0x9D600. 0xF4F2 0x6B6D

Transcription

1 S P E C I A L L i n u x 1LILO PCLinux LILO Linux LILO LInux LOader PCi386 PCBIOS LILO BIOS BIOS 1LILOfirst.S second.s 2 setup.s LILO 3 C LILO LILOLinux 0x7C00 0x9A000 0x9A000 0x9B000 L 0x9B000 I 0x9B000 LI? L /boot/map 0x9D200-0x9D800 0x9D600 0xF4F2 0x6B6D Linux Japan April 2000

2 L i n u x O boot lilo.conf Loading initrd0x x x90200 vmlinuz 0x x x90200 BIOS (INT xx BIOSfirst.S BIOS BIOSAH 1 first.s first.s lilomake Makefile first.b firist.s lilo.h includedefine lilo boot.b.word VERSION.org CODE_START_1 lilo.conf 1 first.s BIOS mov ah,#14!#14=0x0e int 0x10! AL xor ax,ax mov dl,al 1 int 0x13 mov ah,8 int 0X13 mov ah 0x02 int 0X13!AH=0! DL 71 HDD! CY01 AH!HDD! DL0,1,2,71 HDD! DL 1,20! DH 0 3F)! CH8bit! CL2bit!! AL ax=0x2011! DL0,1,2,71 HDD! DH 0! CH8bit! CL7 62bit! 5 0! ES BX! CF01! AH00H 10H 11H 12H 13H 20H 40H 80H AAH BBH CCH E0H FFH mov dl,#0x80 Linux Japan April 2000

3 SPECIAL 1 lilo EA 69 JMP 69CODE_START_ C 49 4C 4F LILO STAGE_FIRST= VERSION =20 0A 10 5a 00 timeout 0C delay 0E Serial Port 0F Serial Port Parameter B time stamp B 01 Descripter Table 1st Sector Address B 01 Descripter Table 2nd Sector Address 1E B 01 Default Command Line Sector Address Prompt Option 1=Enable Greeting Message Length Initial Greeting Message File MAP Sector Address 2b B 01 Key Translation Talbe Sector Address B 01 Secondary Boot Loader Sector Address 1st B 01 Secondary Boot Loader Sector Address 2nd 3A B 01 Secondary Boot Loader Sector Address 3rd 3F B 01 Secondary Boot Loader Sector Address 4th B 01 Secondary Boot Loader Sector Address 5th 4A B 01 Secondary Boot Loader Sector Address 6th 4E B 01 Secondary Boot Loader Sector Address 7th B 01 Secondary Boot Loader Sector Address 8th 2 HDD 0 DL=0x8071HDD 0x5B DH=0x5B 0x193 CL=0x50= CH=0x93 bit6 0x100+0x93=0x193 0x10 CL=0x50= x10 lilo.conf boot=/dev/hda3 map=/boot/map install=/boot/boot.b prompt timeout=50 image=/boot/vmlinuz vl3 label=linux root=/dev/hda3 initrd=/boot/initrd vl3.img read-only other=/dev/hda1 label=dos table=/dev/hda lilo 2 1 LILO Ver.21 4Bytes 8 BIOSHCS DX CX AL B 01 CX=9350 DX=5B80 AL=1 CPU AL=1 1lilo.conf compact1 BIOS 2 2 lilo eb 69 4c 49 4c 4f a C b b b b b b b b b b b b b b8 c0 07 8e d8006b Linux Japan April 2000

4 L i n u x 1 1 first.s 3 512Bytes second.s 3 first.s start: mov ax,#bootseg! mov ds,ax!ds=#bootseg=7c0 mov ext_es,es!external parameters mov ext_si,si mov ext_bx,bx mov ext_dl,dl mov ax,#firstseg mov es,ax!es=#firstseg=9a00 mov cx,#256!256 sub si,si!si=0 sub di,di!di=0 cld! si di rep! cx=0 movsw!ds:si es:di 1si,di 1cx 1 7c0:0 7c0:511 9A000 9A511 jmpi go,firstseg!firstseg:go go: cli!sp mov ds,ax!ds=ax=firstseg=9a00 mov es,ax!es=ax=9a00 mov sp,#stack!sp=b000 mov ax,#stackseg mov ss,ax!ss=9000 sti! mov al,#0x0d! CR \r call display!al mov al,#0x0a! LF \n call display mov al,#0x4c! L call display! L lagain:mov si,#d_addr!#d_addr=0x30 mov bx,#second!bx=#second=0x1000 cld sload: lodsw!axes:sisi2bytes mov cx,ax!ch8bit CL2bit lodsw!ax mov dx,ax!dh DL or ax,cx! at EOF? 20 EOF ax cx 0 jz done! yes -> start it 0 done inc si!5bytes1bytessi call cread!cx dxes:bx jc error! error add bx,#512!1 512Bytes jmp sload!eof error:! xor ax,ax!fdc mov dl,al!dl=al=0 mov dl,#0x80 int 0x13 jmp lagain!start done: mov al,#0x49! I call display jmpi 0,SECONDSEG!CS=9B00 IP=0 #ifndef LCF_NO1STDIAG Linux Japan April 2000

5 SPECIAL 3 bout: push ax!al= shr al,#4!4bit call nout! 16 pop ax! AL nout: and al,#15!#15=#0x0f4bit add al,#48!#48=#0x30ascii cmp al,#58!#58=#0x3a 0-9A-F jb nokay!0-9 add al,#7!7 0xA+0x30=0x3A 0x3A+7=-0x41 A nokay: #endif display:xor bh,bh!al ASCII mov ah,#14!#14=#0x0e int 0x10 linerr:pop dx! pop cx!call cread pop bx!cy=1 cread: test dl,#linear_flag!dl=61! dl AND 0x40 0ZF jz readsect!zf=0readsect and dl,#0xff-linear_flag!! dl AND 0xDF( ) 60 lnread:!lilo Ver.21 push bx!es:bx= push cx!lsw 16!DH={a23,a22,a21,a20,a19,a18,a17,a16} DL=!CH={a15,a14,a13,a12,a11,a10,a9,a8}!CL={a7,a6,a5,a4,a3,a2,a1,a0} push dx!msw with drive DH=8DL= bx cx dx mov ah,#8! int 0x13!CX DX jc linerr! liner mov bl,dh!bl=dh 0 3F pop dx!dh={a23,a22,a21,a20,a19,a18,a17,a16} DL= mov t_drive,dl!t_drive= mov dl,dh!dl=dh={a23,a22,a21,a20,a19,a18,a17,a16} xor dh,dh!dh=0 mov bh,dh!bh=0 BL= pop ax!ax=cx={(a15,a14,a13,a12,11,a10,a9,a8),(a7,a6,a5,a4,a3,a2,a1,a0)}!dx:ax=24 #ifdef CYL_CHECK!CX=={(z7,z6,z5,z4,z3,2,z1,z0),(z9,z8, m5,m4,m3,m2,m1,m0)} push cx!ch= 8!CL= xchg ch,cl!cl CH Linux Japan April 2000

6 L i n u x 3 rol ch,1!ch=8 76 rol ch,1!ch={m5,m4,m3,m2,m1,m0, z9,z8} and ch,#3!ch={0,0,0,0,0,0, z9,z8} mov n_cyl,cx!n_cyl=cx={(0,0,0,0,0,0, z9,z8),(z7,z6,z5,z4,z3,z2,z1,z0)} pop cx!cx=6push #endif and cx,#0x3f!ch=0 CL={0,0,m5,m4,m3,m2,m1,m0 } div cx!ax={(dx:ax)/cx }= /!DL= DH=0 (CX <= 63)! inc dl!11!ax=0!dl= mov t_sector,dl!t_sector=dl xor dx,dx!dx=0 inc bx!0 1 div bx!ax= ( / ) =!DL= = DH=0 mov dh,dl!dh= mov dl,t_drive!dl= #ifdef CYL_CHECK cmp ax,n_cyl! 63AX= >= n_cyl ja linerr3! #endif!0,0,0,0,0,0,c9,c8,c7,c6,c5,c4,c3,c2,c1,c0}! {s5,s5,s4,s3,s2,s1,s0} xchg ah,al!ah ALAL={0,0,0,0,0,0,c9,c8} AH={c7,c6,c5,c4,c3,c2,c1,c0} ror al,1 ror al,1!al={c9,c8,0,0,0,0,0,0} or al,t_sector!al={c9,c8,s5,s4,s3,s2,s1,s0} mov cx,ax!cx={(c7,c6,c5,c4,c3,c2,c1,c0) {c9,c8,s5,s4,s3,s2,s1,s0)} pop bx!bx= readsect: mov ax,#0x201! 1 int 0x13!ES:BX! CY! CY #ifdef CYL_CHECK linerr3:pop bx!spcread PUSH POP xor ax,ax!zero indicates stc! R E S O U R C E i386 BIOS LILO readkernel.html Linux Japan April 2000