1214 lines
20 KiB
NASM
1214 lines
20 KiB
NASM
.model tiny
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||
.486
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||
smart
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||
.code
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||
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org 0100h
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include ..\include\fat.h
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include ..\include\mem.h
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||
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start:
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push cs
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||
push cs
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push cs
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push cs
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pop ds
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pop es
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pop fs
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pop gs
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xor ax,ax
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mov ds,ax
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mov si,7C00h
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mov di,offset myboot
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mov cx,type bootsector
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push cs
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pop es
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rep movsb
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push cs
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pop ds
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jmp noone
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xor ax,ax
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mov es,ax
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mov di,1Eh*4
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lds si,es:[di]
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mov es:[di],cs
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mov word ptr es:[di],offset myDPT
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push cs
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pop es
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mov cx,type DPT
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rep movsb
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mov ax,cs:[Bootsector.SectorsPerTrack]
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mov es:[DPT.SectorPerTracks],al
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noone:
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push cs
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push cs
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push cs
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push cs
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pop ds
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pop es
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pop fs
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pop gs
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mov si,offset present
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mov bl,4
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call showstr
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mov si,offset premice2
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mov bl,7
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call showstr
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call MBinit
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jc nomem1
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call InitDrive
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mov si,offset premice
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mov bl,7
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call showstr
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mov si,offset next
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call showstr
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mov si,offset conf
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call showstr
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mov al,0
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mov cx,2000
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mov di,offset loadinglist
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rep stosb
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mov di,offset loadinglist
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call loadfile
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jc noconfread
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mov si,offset debut
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mov bl,7
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call showstr
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xor cx,cx
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mov si,offset loadinglist
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suiteloading:
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call readline
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jc noconfload
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mov bl,7
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push si
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mov si,offset next
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call showstr
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pop si
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call showstr
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xor bp,bp
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mov dx,ax
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cmp ax,8h
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jb noadder
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cmp ax,10h
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ja noadder
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mov bp,1
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sub dx,8
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jmp haveirq
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noadder:
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cmp ax,70h
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jb noadd
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cmp ax,78h
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ja noadd
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mov bp,1
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sub dx,68h
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haveirq:
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push si
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mov si,offset irqs
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call showstr
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mov cx,4
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call showhex
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mov si,offset irqsend
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call showstr
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pop si
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noadd:
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cmp bp,1
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jne install
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call replacehandler
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jmp suites
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install:
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call installhandler
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suites:
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jc nohandlerload
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mov dx,es
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mov bl,7
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push si
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mov si,offset address
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call showstr
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mov cx,16
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call showhex
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mov si,offset addressend
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call showstr
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inc cx
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pop si
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call nextline
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jnz suiteloading
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;initialisation des MCBs
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mov ah,0
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int 49h
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mov si,offset fini
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mov bl,7
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call showstr
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mov si,offset next
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call showstr
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mov si,offset prompt
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call showstr
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call projfile
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jc nopromptload
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push es
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push 0100h
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push 7202h
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popf
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push es
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push es
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push es
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pop ds
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pop fs
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pop gs
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db 0CBh
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nopromptload:
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mov si,offset prompte
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mov bl,4
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call showstr
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jmp erroron
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nohandlerload:
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mov si,offset handlere
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mov bl,4
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call showstr
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jmp erroron
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noconfread:
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mov si,offset confee
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mov bl,4
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call showstr
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jmp erroron
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nomem1:
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mov si,offset premice2e
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mov bl,4
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call showstr
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jmp erroron
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nomem2:
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mov si,offset premice3e
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mov bl,4
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call showstr
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jmp erroron
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noconfload:
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mov di,si
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mov si,offset confe
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mov bl,4
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call showstr
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mov dx,cx
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mov cx,16
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call showhex
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mov si,offset confe2
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mov bl,3
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call showstr
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mov dx,di
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mov cx,16
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call showhex
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erroron:
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push cs
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pop ds
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mov si,offset erreur
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mov bl,4
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call showstr
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mov ax,0
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int 16h
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push 0FFFFh
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push 0
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db 0CBh
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address db ' [',0
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addressend db ':0100] ',0
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irqs db ' (IRQ ',0
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irqsend db ')',0
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prompt db 'commande.exe',0
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conf db 'systeme.ini',0
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premice db 0Dh,0Ah,'Chargement du fichier de configuration:',0
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debut db 0Dh,0Ah,'Chargement des pilotes systeme:',0
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fini db 0Dh,0Ah,'Chargement de l''interpreteur de commande:',0
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next db 0Dh,0Ah,' - ',0
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prompte db 0Dh,0Ah,'Erreur lors du chargement de l''interpreteur',0
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handlere db 0Dh,0Ah,'Erreur lors du chargement des pilotes',0
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confe db 0Dh,0Ah,'Erreur dans le fichier de configuration a la ligne ',0
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confee db 0Dh,0Ah,'Erreur de lecture du fichier de configuration',0
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confe2 db ' caractere ',0
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erreur db 0Dh,0Ah,'Pressez une touche pour redemarrer...',0
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present db 0Dh,0Ah,'COS2000 Version 1.2',0
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premice2 db 0Dh,0Ah,'Initialisation de la memoire',0
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premice2e db 0Dh,0Ah,'Erreur lors de l''initialisation memoire',0
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premice3e db 0Dh,0Ah,'Erreur lors de la reservation memoire',0
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;==positionne si sur l'entr<74>e suivante de la loading liste jusqu'a equal
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nextline:
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push ax cx di
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||
push cs
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pop es
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||
mov di,si
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mov al,0Ah
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mov cx,20
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cld
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repnz scasb
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mov si,di
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cmp byte ptr [di],0
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pop di cx ax
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ret
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;==Lit la loading list et initialise SI(Fichier) AX(interruption)
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readline:
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push cx dx di es
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push cs
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pop es
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;Voir taille de la ligne -> DX
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mov di,si
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mov al,0Dh
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mov cx,20
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cld
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repne scasb
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sub cx,20
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neg cx
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mov dx,cx
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;N<> interruption ??
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mov di,si
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mov al,'('
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repne scasb
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jne noaddr
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;Non, je recherche l'int positionnement parenthese de fin
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mov al,')'
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repne scasb
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jne errorlist
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;Je lit l'interruption dans DL
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xor dl,dl
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xor cx,cx
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dec di
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readingint:
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dec di
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mov al,[di]
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cmp al,'('
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je finishint
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call eval
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jc errorlist
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shl ax,cl
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add dl,al
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add cx,4
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cmp cx,8
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ja errorlist
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jmp readingint
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noaddr:
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dec di
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mov dl,0
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finishint:
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||
;mise d'un 0 a la fin du nom
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mov byte ptr [di],0
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mov al,dl
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pop es di dx cx
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clc
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ret
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errorlist:
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sub di,si
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mov si,di
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pop es di dx cx
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stc
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ret
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;return carry si pas hexa pour al et renvoie dans al la valeur d<>cimale
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eval:
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push si
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xor si,si
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searchex:
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cmp al,cs:[si+offset hexas]
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je endsearchex
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inc si
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cmp si,15
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jbe searchex
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pop si
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stc
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ret
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endsearchex:
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mov ax,si
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pop si
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clc
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ret
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hexas db '0123456789ABCDEF',0
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;==============================Affiche le nombre nb hexa en EDX de taille CX et couleur BL==============
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ShowHex:
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push ax bx cx edx si di
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mov di,cx
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sub cx,32
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neg cx
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shl edx,cl
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shr di,2
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mov ah,09h
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and bx,1111b
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Hexaize:
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rol edx,4
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mov si,dx
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and si,1111b
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mov al,[si+offset tab]
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push cx
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mov cx,1
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cmp al,32
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jb control2
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mov ah,09h
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int 10h
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control2:
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mov ah,0Eh
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int 10h
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pop cx
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dec di
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jnz Hexaize
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pop di si edx cx bx ax
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ret
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Tab db '0123456789ABCDEF'
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;==============================Affiche une chaine DS:SI de couleur BL==============
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showstr:
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push ax bx cx si
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mov cx,1
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again:
|
||
lodsb
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||
or al,al
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jz fin
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and bx,0111b
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cmp al,32
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jb control
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mov ah,09h
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int 10h
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||
control:
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mov ah,0Eh
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||
int 10h
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jmp again
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||
fin:
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||
pop si cx bx ax
|
||
ret
|
||
|
||
|
||
;================================================
|
||
;Routine de d<>bogage
|
||
;================================================
|
||
regdata:
|
||
eaxr dd 0
|
||
ebxr dd 0
|
||
ecxr dd 0
|
||
edxr dd 0
|
||
esir dd 0
|
||
edir dd 0
|
||
espr dd 0
|
||
ebpr dd 0
|
||
csr dw 0
|
||
dsr dw 0
|
||
esr dw 0
|
||
fsr dw 0
|
||
gsr dw 0
|
||
ssr dw 0
|
||
|
||
reg db 0Dh,0Ah,"eax : ",0
|
||
db 0Dh,0Ah,"ebx : ",0
|
||
db 0Dh,0Ah,"ecx : ",0
|
||
db 0Dh,0Ah,"edx : ",0
|
||
db 0Dh,0Ah,"esi : ",0
|
||
db 0Dh,0Ah,"edi : ",0
|
||
db 0Dh,0Ah,"esp : ",0
|
||
db 0Dh,0Ah,"ebp : ",0
|
||
db 0Dh,0Ah,"cs : ",0
|
||
db 0Dh,0Ah,"ds : ",0
|
||
db 0Dh,0Ah,"es : ",0
|
||
db 0Dh,0Ah,"fs : ",0
|
||
db 0Dh,0Ah,"gs : ",0
|
||
db 0Dh,0Ah,"ss : ",0
|
||
|
||
showreg:
|
||
pushad
|
||
pushf
|
||
push ds
|
||
mov cs:[eaxr],eax
|
||
mov cs:[ebxr],ebx
|
||
mov cs:[ecxr],ecx
|
||
mov cs:[edxr],edx
|
||
mov cs:[esir],esi
|
||
mov cs:[edir],edi
|
||
mov cs:[espr],esp
|
||
mov cs:[ebpr],ebp
|
||
mov cs:[csr],cs
|
||
mov cs:[dsr],ds
|
||
mov cs:[esr],es
|
||
mov cs:[fsr],fs
|
||
mov cs:[gsr],gs
|
||
mov cs:[ssr],ss
|
||
push cs
|
||
pop ds
|
||
mov si,offset poppp
|
||
call Showstr
|
||
mov si,offset reg
|
||
mov di,offset regdata
|
||
mov bx,7
|
||
showregs:
|
||
cmp byte ptr cs:[si+6],":"
|
||
jne endshowregs
|
||
call Showstr
|
||
cmp byte ptr cs:[si+4]," "
|
||
je segsss
|
||
mov edx,cs:[di]
|
||
mov cx,32
|
||
call Showhex
|
||
add di,4
|
||
jmp showmax
|
||
segsss:
|
||
mov dx,cs:[di]
|
||
mov cx,16
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||
call Showhex
|
||
add di,2
|
||
showmax:
|
||
add si,9
|
||
mov bp,dx
|
||
push si
|
||
mov si,offset beginds
|
||
call showstr
|
||
mov si,bp
|
||
mov cx,8
|
||
mov al,0
|
||
letshow:
|
||
mov dl,ds:[si]
|
||
inc si
|
||
call showhex
|
||
inc al
|
||
cmp al,10
|
||
jb letshow
|
||
mov si,offset ende
|
||
call showstr
|
||
mov si,offset begines
|
||
call showstr
|
||
mov si,bp
|
||
mov cx,8
|
||
mov al,0
|
||
letshow2:
|
||
mov dl,es:[si]
|
||
inc si
|
||
call showhex
|
||
inc al
|
||
cmp al,10
|
||
jb letshow2
|
||
mov si,offset ende
|
||
call showstr
|
||
pop si
|
||
jmp showregs
|
||
endshowregs:
|
||
mov si,offset poppp
|
||
call Showstr
|
||
xor ax,ax
|
||
int 16h
|
||
pop ds
|
||
popf
|
||
popad
|
||
ret
|
||
begines db ' es[',0
|
||
beginds db ' ds[',0
|
||
ende db '] ',0
|
||
|
||
;vide ES pour 200 octets (pour test)
|
||
showmem:
|
||
pushad
|
||
pushf
|
||
mov si,offset poppp
|
||
mov bx,7
|
||
call Showstr
|
||
mov dx,es
|
||
mov cx,16
|
||
mov bx,7
|
||
call ShowHex
|
||
mov si,offset poppp
|
||
mov bx,7
|
||
call Showstr
|
||
xor si,si
|
||
loopererr:
|
||
mov dx,es:[si]
|
||
mov cx,8
|
||
mov bx,7
|
||
call ShowHex
|
||
inc si
|
||
cmp si,200
|
||
jb loopererr
|
||
mov si,offset poppp
|
||
mov bx,7
|
||
call Showstr
|
||
xor ax,ax
|
||
int 16h
|
||
popf
|
||
popad
|
||
ret
|
||
|
||
poppp db 0Ah,0Dh,'*********',0Ah,0Dh,0
|
||
|
||
;================================================
|
||
;Routine de gestion de la m<>moire
|
||
;================================================
|
||
|
||
include ..\include\mem.h
|
||
|
||
FirstMB dw 0
|
||
|
||
|
||
;Initialise les blocs de m<>moire en prenant GS pour segment de base
|
||
MBinit:
|
||
push ax cx es
|
||
mov ax,memorystart
|
||
mov cs:Firstmb,ax
|
||
mov cx,0A000h
|
||
sub cx,ax
|
||
dec ax
|
||
dec ax
|
||
mov es,ax
|
||
mov es:[MB.Reference],Free
|
||
mov es:[MB.Sizes],cx
|
||
mov es:[MB.Check],'NH'
|
||
mov dword ptr es:[MB.Names],'eerF'
|
||
mov dword ptr es:[MB.Names+4],0
|
||
mov es:[MB.IsNotLast],False
|
||
clc
|
||
pop es cx ax
|
||
ret
|
||
notforfree:
|
||
stc
|
||
pop es cx ax
|
||
ret
|
||
|
||
;Cre<72>r un bloc de nom ds:si de taille cx (octets) -> n<>segment dans GS
|
||
MBCreate:
|
||
push ax bx cx dx si di es
|
||
shr cx,4
|
||
inc cx
|
||
mov bx,cs:firstmb
|
||
dec bx
|
||
dec bx
|
||
mov dl,1
|
||
searchfree:
|
||
cmp dl,False
|
||
je wasntgood
|
||
mov es,bx
|
||
cmp es:[MB.Check],'NH'
|
||
jne wasntgood
|
||
cmp es:[MB.IsNotLast],True
|
||
sete dl
|
||
cmp es:[MB.Reference],Free
|
||
jne notsogood
|
||
mov ax,es:[MB.Sizes]
|
||
cmp cx,ax
|
||
ja notsogood
|
||
mov word ptr es:[MB.Check],'NH'
|
||
mov es:[MB.IsNotLast],True
|
||
mov es:[MB.Reference],cs
|
||
mov es:[MB.IsResident],True
|
||
mov es:[MB.Sizes],cx
|
||
mov di,MB.Names
|
||
push ax cx
|
||
mov cx,32
|
||
loops:
|
||
mov dh,[si]
|
||
inc si
|
||
dec cx
|
||
jz endofloops
|
||
cmp dh,0
|
||
je endofloops
|
||
mov es:[di],dh
|
||
inc di
|
||
jmp loops
|
||
endofloops:
|
||
inc cx
|
||
mov al,0
|
||
rep stosb
|
||
pop cx ax
|
||
sub ax,cx
|
||
dec ax
|
||
dec ax
|
||
;js nofree
|
||
inc bx
|
||
inc bx
|
||
mov gs,bx
|
||
add bx,cx
|
||
mov es,bx
|
||
mov es:[MB.IsNotLast],dl
|
||
mov es:[MB.IsResident],False
|
||
mov es:[MB.Reference],Free
|
||
mov es:[MB.Sizes],ax
|
||
mov dword ptr es:[MB.Names],'eerF'
|
||
mov dword ptr es:[MB.Names+4],0
|
||
mov es:[MB.Check],'NH'
|
||
nofree:
|
||
clc
|
||
pop es di si dx cx bx ax
|
||
ret
|
||
wasntgood:
|
||
stc
|
||
pop es di si dx cx bx ax
|
||
ret
|
||
notsogood:
|
||
inc bx
|
||
inc bx
|
||
add bx,es:[MB.Sizes]
|
||
jmp searchfree
|
||
|
||
;================================================
|
||
;Routine de gestion de handler
|
||
;================================================
|
||
|
||
;remplace le handler pointer par ds:si en bloc:100h interruption ax
|
||
replacehandler:
|
||
push ax bx cx si di ds
|
||
call projfile
|
||
jc reph
|
||
mov bx,ax
|
||
call getint
|
||
mov es:[102h],si
|
||
mov es:[104h],ds
|
||
call setint
|
||
reph:
|
||
pop ds di si cx bx ax
|
||
ret
|
||
|
||
;install le handler pointer par ds:si en bloc:100h interruption ax -> es
|
||
installhandler:
|
||
push bx cx
|
||
call projfile
|
||
jc insh
|
||
mov bx,ax
|
||
call setint
|
||
insh:
|
||
pop cx bx
|
||
ret
|
||
|
||
;met es:100h le handle de l'int bx
|
||
setint:
|
||
push ax bx ds
|
||
cli
|
||
shl bx,2
|
||
xor ax,ax
|
||
mov ds,ax
|
||
mov word ptr ds:[bx],0100h
|
||
mov ds:[bx+2],es
|
||
pop ds bx ax
|
||
sti
|
||
ret
|
||
|
||
;met dans ds:si le handle de l'int bx
|
||
getint:
|
||
push ax bx es
|
||
shl bx,2
|
||
xor ax,ax
|
||
mov es,ax
|
||
mov si,es:[bx]
|
||
mov ds,es:[bx+2]
|
||
pop es bx ax
|
||
ret
|
||
|
||
;================================================
|
||
;Routine de gestion de systeme de fichier FAT12
|
||
;================================================
|
||
|
||
;DPT disquette
|
||
mydpt DPT ?
|
||
|
||
;Secteur de boot
|
||
myboot bootSector ?
|
||
|
||
;Donn<6E>es Calcul<75>e
|
||
clustersize dw 0
|
||
TracksPerHead dw 0
|
||
DriveSize dd 0
|
||
AdressBoot dw 0
|
||
AdressFat dw 0
|
||
AdressParent dw 0
|
||
AdressData dw 0
|
||
AddingValue dw 0
|
||
CurrentDir dw 0 ;En cluster
|
||
CurrentDirStr db 128 dup (0)
|
||
|
||
;Pour recherches
|
||
EntryPlace dw 0 ;En octet
|
||
AdressDirectory dw 0 ;En cluster
|
||
firstsearch dw 1 ;Premiere requete ?
|
||
|
||
getfat:
|
||
push ax bx dx si
|
||
mov ax,cx
|
||
mov bx,ax
|
||
and bx,0000000000000001b
|
||
shr ax,1
|
||
mov cx,3
|
||
mul cx
|
||
mov si,offset bufferfat
|
||
add si,ax
|
||
cmp bx,0h
|
||
jnz evenfat
|
||
oddfat:
|
||
mov dx,cs:[si]
|
||
and dx,0FFFh
|
||
mov cx,dx
|
||
jmp endfat
|
||
evenfat:
|
||
mov dx,cs:[si+1]
|
||
and dx,0FFF0h
|
||
shr dx,4
|
||
mov cx,dx
|
||
endfat:
|
||
cmp dx,0FF0h
|
||
jbe nocarry
|
||
stc
|
||
pop si dx bx ax
|
||
ret
|
||
nocarry:
|
||
clc
|
||
pop si dx bx ax
|
||
ret
|
||
|
||
;============projfile (Fonction 17)===============
|
||
;Charge le fichier ds:si sur un bloc m<>moire -> ecx taille -> es bloc
|
||
;-> AH=17
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
projfile:
|
||
push eax bx di gs
|
||
push cs
|
||
pop es
|
||
call uppercase
|
||
mov di,offset tempfit
|
||
call searchfile
|
||
jne errorload
|
||
jc errorload
|
||
mov eax,cs:tempfit.FileSize
|
||
mov ecx,eax
|
||
add ecx,100h
|
||
call MBCreate
|
||
jc errorload
|
||
push gs
|
||
pop es
|
||
mov cx,cs:tempfit.FileGroup
|
||
mov di,100h
|
||
call loadway
|
||
jc errorload
|
||
clc
|
||
mov ecx,eax
|
||
pop gs di bx eax
|
||
ret
|
||
errorload:
|
||
stc
|
||
mov ecx,0
|
||
pop gs di bx eax
|
||
ret
|
||
|
||
;============loadfile (Fonction 4)===============
|
||
;Charge le fichier ds:si en es:di ->ecx taille
|
||
;-> AH=4
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
loadfile:
|
||
push eax bx di
|
||
push es di
|
||
push cs
|
||
pop es
|
||
mov di,offset tempfit
|
||
call searchfile
|
||
pop di es
|
||
jne errorload
|
||
jc errorload
|
||
mov cx,cs:tempfit.FileGroup
|
||
mov eax,cs:tempfit.FileSize
|
||
call loadway
|
||
jc errorload2
|
||
clc
|
||
;mov ecx,eax
|
||
pop di bx eax
|
||
ret
|
||
errorload2:
|
||
stc
|
||
mov ecx,0
|
||
pop di bx eax
|
||
ret
|
||
|
||
tempfit db 32 dup (0)
|
||
|
||
;=============SearchFile (Fonction 10)===============
|
||
;Renvois dans ES:DI la fit du fichier DS:SI et non equal si pas existant
|
||
;-> AH=10
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
SearchFile:
|
||
push ax cx ds si di es
|
||
call uppercase
|
||
push ds si
|
||
call findfirstfilez
|
||
push ds
|
||
pop es
|
||
mov di,si
|
||
pop si ds
|
||
jc errorsearch
|
||
jmp founded
|
||
nextsearch:
|
||
push ds si
|
||
call findnextfilez
|
||
push ds
|
||
pop es
|
||
mov di,si
|
||
pop si ds
|
||
founded:
|
||
cmp byte ptr cs:[di],0
|
||
je notgood
|
||
cmp byte ptr cs:[di+FileAttr],0Fh
|
||
je nextsearch
|
||
call cmpnames
|
||
jc nextsearch
|
||
okfound:
|
||
push cs
|
||
pop ds
|
||
mov si,di
|
||
pop es di
|
||
push di es
|
||
mov cx,32
|
||
rep movsb
|
||
clc
|
||
pop es di si ds cx ax
|
||
ret
|
||
notgood:
|
||
cmp si,0FF5h
|
||
pop es di si ds cx ax
|
||
ret
|
||
errorsearch:
|
||
stc
|
||
pop es di si ds cx ax
|
||
ret
|
||
|
||
;Transforme la chaine ds:si en maj
|
||
uppercase:
|
||
push si ax
|
||
mov di,si
|
||
uppercaser:
|
||
mov al,ds:[si]
|
||
cmp al,0
|
||
je enduppercase
|
||
cmp al,'a'
|
||
jb nonmaj
|
||
cmp al,'z'
|
||
ja nonmaj
|
||
sub al,'a'-'A'
|
||
mov ds:[si],al
|
||
nonmaj:
|
||
inc si
|
||
jmp uppercaser
|
||
enduppercase:
|
||
clc
|
||
pop ax si
|
||
ret
|
||
|
||
;Compare le nom ds:si '.' avec es:di
|
||
CmpNames:
|
||
push ax cx si di
|
||
mov cx,8
|
||
repe cmpsb
|
||
jne nequal
|
||
inc si
|
||
nequal:
|
||
cmp byte ptr [si-1],'.'
|
||
jne trynoext
|
||
mov al,' '
|
||
rep scasb
|
||
mov cx,3
|
||
rep cmpsb
|
||
jne notequal
|
||
cmp byte ptr [si],0
|
||
jne notequal
|
||
cmp cx,0
|
||
jl notequal
|
||
itok:
|
||
pop di si cx ax
|
||
ret
|
||
trynoext:
|
||
cmp byte ptr [si-1],0
|
||
jne notequal
|
||
jmp itok
|
||
notequal:
|
||
stc
|
||
pop di si cx ax
|
||
ret
|
||
|
||
;charge le fichier de de groupe CX et de taille eax
|
||
LoadWay:
|
||
push eax bx dx si di ecx ds es
|
||
cmp eax,0
|
||
je Zeroload
|
||
rol eax,16
|
||
mov dx,ax
|
||
ror eax,16
|
||
div cs:clusterSize
|
||
mov bx,ax
|
||
cmp bx,1
|
||
jb adjustlast
|
||
Loadfat:
|
||
call readcluster
|
||
jc noway
|
||
add di,cs:clusterSize
|
||
call getfat
|
||
dec bx
|
||
jnz loadfat
|
||
AdjustLast:
|
||
push es di
|
||
push cs
|
||
pop es
|
||
mov di,offset bufferread
|
||
mov si,di
|
||
call Readcluster
|
||
pop di es
|
||
jc noway
|
||
mov cx,dx
|
||
push cs
|
||
pop ds
|
||
rep movsb
|
||
zeroload:
|
||
clc
|
||
pop es ds ecx di si dx bx eax
|
||
ret
|
||
noway:
|
||
stc
|
||
pop es ds ecx di si dx bx eax
|
||
ret
|
||
|
||
;=============INITDRIVE (Fonction 04H)===============
|
||
;Initialise le lecteur pour une utilisation ult<6C>rieure
|
||
;-> AH=4
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
InitDrive:
|
||
push eax bx cx edx di ds es
|
||
push cs
|
||
pop ds
|
||
push cs
|
||
pop es
|
||
mov cs:lastseg,0
|
||
mov cs:lastoff,0
|
||
mov cs:LastRead,0
|
||
mov ax,myboot.sectorsize
|
||
mov bl,myboot.SectorsPerCluster
|
||
xor bh,bh
|
||
mul bx
|
||
mov clustersize,ax
|
||
mov bx,myboot.HiddenSectorsL
|
||
adc bx,myboot.HiddenSectorsH
|
||
mov AdressBoot,bx
|
||
add bx,myboot.ReservedSectors
|
||
mov AdressFat,bx
|
||
xor ax,ax
|
||
mov al,myboot.FatsPerDrive
|
||
mul myboot.SectorsPerFat
|
||
add bx,ax
|
||
mov AdressParent,bx
|
||
mov AdressDirectory,bx
|
||
mov ax,32
|
||
mul myboot.DirectorySize
|
||
div myboot.SectorSize
|
||
add bx,ax
|
||
mov AdressData,bx
|
||
sub bx,2
|
||
mov AddingValue,bx
|
||
mov ax,myboot.SectorsPerDrive
|
||
div myboot.SectorsPerTrack
|
||
xor dx,dx
|
||
div myboot.HeadsPerDrive
|
||
mov TracksPerHead,ax
|
||
xor eax,eax
|
||
mov ax,myboot.SectorsPerDrive
|
||
sub ax,AdressData
|
||
mul myboot.SectorSize
|
||
shl edx,16
|
||
add edx,eax
|
||
mov DriveSize,edx
|
||
mov CurrentDir,0
|
||
mov EntryPlace,0
|
||
mov adressdirectory,0
|
||
mov firstsearch,1
|
||
mov currentdirstr,0
|
||
mov di,offset bufferfat
|
||
mov dx,myboot.SectorsPerFat
|
||
mov cx,AdressFat
|
||
SeeFat:
|
||
call readsector
|
||
jc ErrorInit
|
||
add di,myboot.SectorSize
|
||
inc cx
|
||
dec dx
|
||
jnz seefat
|
||
clc
|
||
pop es ds di edx cx bx eax
|
||
ret
|
||
ErrorInit:
|
||
stc
|
||
pop es ds di edx cx bx eax
|
||
ret
|
||
|
||
;=============FindFirstFile (Fonction 7)==============
|
||
;Renvois dans ES:DI un bloc d'info
|
||
;-> AH=7
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
FindFirstFileZ:
|
||
push cx
|
||
mov cx,cs:CurrentDir
|
||
mov cs:AdressDirectory,cx
|
||
xor cx,cx
|
||
mov cs:EntryPlace,cx
|
||
mov cs:firstsearch,1
|
||
call findnextfileZ
|
||
pop cx
|
||
ret
|
||
|
||
;=============FindnextFile (Fonction 8)==============
|
||
;Renvois dans ES:DI un bloc d'info
|
||
;-> AH=8
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
;fait pointer ds:si sur la prochaine entr<74>e du repertoire courant
|
||
FindnextFileZ:
|
||
push ax bx cx es di
|
||
push cs
|
||
pop ds
|
||
mov cx,cs:AdressDirectory
|
||
mov bx,cs:Entryplace
|
||
FindnextFileagain:
|
||
cmp cs:firstsearch,1
|
||
je first
|
||
add bx,32
|
||
cmp bx,cs:clusterSize
|
||
jb nopop
|
||
first:
|
||
mov di,offset bufferentry
|
||
push cs
|
||
pop es
|
||
mov bx,0
|
||
cmp cs:currentdir,0
|
||
jne notrootdir
|
||
cmp cs:firstsearch,1
|
||
je noaddfirst1
|
||
inc cx
|
||
noaddfirst1:
|
||
add cx,cs:adressparent
|
||
mov al,myboot.sectorspercluster
|
||
readroot:
|
||
call readsector
|
||
jc notwell
|
||
add di,myboot.sectorsize
|
||
dec al
|
||
jnz readroot
|
||
sub cx,cs:adressparent
|
||
jmp nopop
|
||
notrootdir:
|
||
cmp cs:firstsearch,1
|
||
je noaddfirst2
|
||
call getfat
|
||
noaddfirst2:
|
||
jc notwell
|
||
call readcluster
|
||
jc notwell
|
||
nopop:
|
||
mov cs:firstsearch,0
|
||
mov si,offset bufferentry
|
||
add si,bx
|
||
cmp byte ptr cs:[si],0
|
||
je notwell
|
||
mov cs:entryplace,bx
|
||
mov cs:AdressDirectory,cx
|
||
cmp byte ptr cs:[si],0E5h
|
||
je findnextfileagain
|
||
cmp byte ptr cs:[si+fileattr],28h
|
||
je findnextfileagain
|
||
cmp byte ptr cs:[si+fileattr],0Fh
|
||
je findnextfileagain
|
||
clc
|
||
pop di es cx bx ax
|
||
ret
|
||
notwell:
|
||
stc
|
||
pop di es cx bx ax
|
||
ret
|
||
|
||
|
||
;=============READCLUSTER (Fonction 14)===============
|
||
;Lit le secteur CX et le met en es:di
|
||
;-> AH=14
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
readcluster:
|
||
push ax bx cx dx di
|
||
mov ax,cx
|
||
mov bl,cs:myboot.sectorspercluster
|
||
xor bh,bh
|
||
mul bx
|
||
mov cx,ax
|
||
add cx,cs:addingvalue
|
||
readsectors:
|
||
call readsector
|
||
jc errorreadincluster
|
||
add di,cs:myboot.sectorsize
|
||
inc cx
|
||
dec bl
|
||
jnz readsectors
|
||
clc
|
||
pop di dx cx bx ax
|
||
ret
|
||
errorreadincluster:
|
||
stc
|
||
pop di dx cx bx ax
|
||
ret
|
||
|
||
;=============READSECTOR (Fonction 01H)===============
|
||
;Lit le secteur CX et le met en es:di
|
||
;-> AH=1
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
ReadSector:
|
||
push ax bx cx dx si
|
||
cmp cx,cs:lastread
|
||
jne gom
|
||
mov ax,es
|
||
cmp cs:lastseg,ax
|
||
jne gom
|
||
cmp di,cs:lastoff
|
||
jne gom
|
||
jmp done
|
||
gom:
|
||
mov cs:lastseg,ax
|
||
mov cs:lastoff,di
|
||
mov cs:LastRead,cx
|
||
mov ax,cx
|
||
xor dx,dx
|
||
div cs:myboot.SectorsPerTrack
|
||
inc dl
|
||
mov bl,dl
|
||
xor dx,dx
|
||
div cs:myboot.HeadsPerDrive
|
||
mov dh,cs:myboot.bootdrive
|
||
xchg dl,dh
|
||
mov cx,ax
|
||
xchg cl,ch
|
||
shl cl,6
|
||
or cl,bl
|
||
mov bx,di
|
||
mov SI,4
|
||
mov AL,1
|
||
TryAgain:
|
||
mov AH, 2
|
||
int 13h
|
||
jnc Done
|
||
dec SI
|
||
jnz TryAgain
|
||
Done:
|
||
pop si dx cx bx ax
|
||
ret
|
||
|
||
lastread dw 0
|
||
lastseg dw 0
|
||
lastoff dw 0
|
||
|
||
bufferread equ $
|
||
bufferFat equ $+2048
|
||
bufferentry equ $+2048+2048
|
||
loadinglist equ $+2048+2048+2048
|
||
end start
|