619 lines
9.3 KiB
NASM
Executable File
619 lines
9.3 KiB
NASM
Executable File
.model tiny
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.486
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smart
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.code
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org 0100h
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start:
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mov si,offset video
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mov bx,400h
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mov ax,47h
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call installhandler
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mov si,offset timer
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mov bx,900h
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mov ax,8h
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call replacehandler
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mov si,offset pic
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mov bx,950h
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mov ax,50h
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call installhandler
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mov si,offset drive
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mov bx,1020h
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mov ax,48h
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call installhandler
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mov si,offset keyboard
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mov bx,1400h
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mov ax,9h
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call replacehandler
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mov ax,40h
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mov es,ax
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mov dx,es:[8]
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cmp dx,0
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je nolpt1
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mov al,0FFh
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add dx,2
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out dx,al
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mov si,offset lpt
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mov bx,1500h
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mov ax,0Fh
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call installhandler
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mov es,bx
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sub al,8
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xor ah,ah
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int 50h
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mov byte ptr es:[105h],'1'
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nolpt1:
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push es
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mov ax,40h
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mov es,ax
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mov dx,es:[10]
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pop es
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cmp dx,0
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je nolpt2
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mov al,0FFh
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add dx,2
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out dx,al
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mov si,offset lpt
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mov bx,1700h
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mov ax,0Dh
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call installhandler
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sub al,8
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xor ah,ah
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int 50h
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mov es,bx
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mov byte ptr es:[105h],'2'
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nolpt2:
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mov si,offset mouse
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mov bx,1900h
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mov ax,74h
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call installhandler
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mov ax,0012
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int 50h
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;mov ah, 00010000b
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;not ah
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;in al, 0a1h
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;and al, ah
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;out 0a1h, al
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mov ah,2
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int 74h
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start2:
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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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mov ah,21
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mov cl,7
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int 47h
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mov ax,0002
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int 47h
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mov ah,2
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int 47h
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mov ah,25
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mov bx,0
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int 47h
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mov ah,13
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mov si,offset msg1
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int 47h
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mov ah,6
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int 47h
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int 47h
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mov ah,13
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mov si,offset prompt
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int 47h
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mov ah,6
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int 47h
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xor di,di
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mov ax,0001h
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mov bx,offset buffer
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mov cx,13
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int 48h
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xor bp,bp
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showall:
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cmp byte ptr [bx+di],0
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je endof2
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mov al,[bx+di+12]
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mov byte ptr [bx+di+12],0
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mov si,bx
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add si,di
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mov ah,13
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int 47h
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mov si,offset spaces
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int 47h
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mov [bx+di+12],al
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mov byte ptr [bx+di+12+5],0
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mov si,bx
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add si,di
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add si,12
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int 47h
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mov ah,6
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int 47h
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add di,32
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inc bp
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jmp showall
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endof2:
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mov ah,21
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mov cl,112
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int 47h
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mov ah,13
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mov si,offset menu
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int 47h
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mov xx,1
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mov xxold,2
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call Select
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endof:
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mov ax,0
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int 16h
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cmp ah,50h
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jne tre1
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cmp xx,bp
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je endof
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inc xx
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call select
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jmp endof
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tre1:
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cmp ah,48h
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jne tre2
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cmp xx,1
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je endof
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dec xx
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call select
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jmp endof
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tre2:
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cmp al,0Dh
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jne tre3
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mov di,xx
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dec di
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shl di,5
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mov dx,[di+bx+26]
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cmp [di+bx+12],00657865h ;EXE
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jne tre3
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mov ah,6
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int 47h
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int 47h
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mov ah,21
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mov cl,7
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int 47h
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mov ah,13
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mov si,offset msg2
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int 47h
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mov cx,dx
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call executefatway
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tre3:
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cmp ah,59
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jne tre4
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mov lastread,0FFFFh
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jmp start2
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tre4:
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cmp ah,67
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jne endof
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mov ax,0001
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int 47h
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mov ah,2
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int 47h
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mov ah,21
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mov cl,4
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int 47h
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mov ah,13
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mov si,offset msg3
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int 47h
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mov ax,0
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int 16h
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mov ax,40h
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mov ds,ax
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mov bx,1234h
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mov ds:[072h],bx
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push 0FFFFh
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push 0000h
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db 0CBh
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executefatway:
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push cs
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mov bx,offset start2
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push bx
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mov bx,03000h
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mov es,bx
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push bx
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mov bx,0100h
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push bx
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call loadfatway
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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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push 7202h
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popf
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db 0CBh
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;cx entr<74>e -> fatway chemin
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getfatway:
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push bx cx es
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mov bx,offset fatway
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fatagain:
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mov cs:[bx],cx
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add bx,2
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cmp cx,0FFF0h
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jae finishload
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call getfat
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jnc fatagain
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finishload:
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pop es cx bx
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ret
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loadfatway:
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push ax bx cx di
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call getfatway
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jc endload
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mov di,offset fatway
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mov si,offset dot
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mov ah,13
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loadagain:
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mov cx,cs:[di]
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cmp cx,0FFF0h
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jae endload
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add di,2
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call readsector
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jc endload
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int 47h
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add bx,cs:sizec
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jmp loadagain
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endload:
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pop di cx bx ax
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ret
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sizec dw 512
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reserv dw 1
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;<-cx n<>secteur ->cx code FAT
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getfat:
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push es ax bx dx
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mov ax,cx
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xor dx,dx
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div cs:sizec
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mov cx,ax
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add cx,cs:reserv
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mov bx,offset buffer
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push cs
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pop es
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call readsector
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jc errorgetfat
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shl dx,1
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add bx,dx
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mov cx,cs:[bx]
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errorgetfat:
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pop dx bx ax es
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ret
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;selectionne la ligne xx
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Select:
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push ax di
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mov di,xxold
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mov al,7
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add di,2
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mov ah,32
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int 47h
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mov ax,xx
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mov xxold,ax
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mov di,xx
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mov ah,32
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mov al,112
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add di,2
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int 47h
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pop di ax
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ret
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xx dw 1
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xxold dw 0
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menu db 'F1 Read disk F2 Read file F9 Quit F11 Change video F12 Debug ',0
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msg1 db ' Cos 2000 menu loader release 1.0',0
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msg2 db 'The program is loading',0
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msg3 db ' Cos will restart your computer, eject the floppy disk and press a key',0
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prompt db '>',0
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spaces db ' ',0
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dot db '.',0
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ReadSector:
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push ax cx dx si
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cmp cx,cs:lastread
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je done
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mov cs:LastRead,cx
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mov AX, CX
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xor DX, DX
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div cs:DiskSectorsPerTrack
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mov CL, DL ;{ Set the sector }
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and CL, 63 ;{ Top two bits are bits 8&9 of the cylinder }
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xor DX, DX
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div cs:DiskTracksPerHead
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mov CH, DL ;{ Set the track bits 0-7 }
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mov AL, DH
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ror AL, 1
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ror AL, 1
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and AL, 11000000b
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or CL, AL ;{ Set bits 8&9 of track }
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xor dX, DX
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div cs:DiskHeads
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mov DH, DL ;{ Set the head }
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inc CL
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mov SI, 4
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TryAgain:
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mov AL, 1
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mov DL, 0
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mov AH, 2
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int 13h
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jnc Done
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dec SI
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jnz TryAgain
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mov word ptr cs:lastread,0ffffh
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Done:
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pop si dx cx ax
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ret
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WriteSector:
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push ax cx dx si
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cmp cs:Lastread,cx
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jne nodestruct
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mov cs:Lastread,0ffffh
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nodestruct:
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mov AX, CX
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xor DX, DX
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div cs:DiskSectorsPerTrack
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mov CL, DL ;{ Set the sector }
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and CL, 63 ;{ Top two bits are bits 8&9 of the cylinder }
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xor DX, DX
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div cs:DiskTracksPerHead
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mov CH, DL ;{ Set the track bits 0-7 }
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mov AL, DH
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ror AL, 1
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ror AL, 1
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and AL, 11000000b
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or CL, AL ;{ Set bits 8&9 of track }
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xor DX, DX
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div cs:DiskHeads
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mov DH, DL ;{ Set the head }
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inc CL
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mov SI, 4
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TryAgain2:
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mov AL, 1
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mov DL, 0
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mov AH, 3
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int 13h
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jnc Done2
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dec SI
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jnz TryAgain2
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Done2:
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pop si dx cx ax
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ret
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Lastread dw 0FFFFh
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;remplace le handler pointer par ds:si en bx:100h interruption ax
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replacehandler:
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push ax bx si di ds es
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mov es,bx
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mov di,0100h
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call loadfile
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mov bx,ax
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call getint
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mov es:[102h],si
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mov es:[104h],ds
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call setint
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pop es ds di si bx ax
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ret
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;install le handler pointer par ds:si en bx:100h interruption ax
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installhandler:
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push bx di es
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mov es,bx
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mov di,100h
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call loadfile
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mov bx,ax
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call setint
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pop es di bx
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ret
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;Charge le fichier Ds:si en es:di
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loadfile:
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push bx cx
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call searchfile
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mov bx,di
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call loadfatway
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pop cx bx
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ret
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;met es:di le handle de l'int bx
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setint:
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push ax bx ds
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cli
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shl bx,2
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xor ax,ax
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mov ds,ax
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mov ds:[bx],di
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mov ds:[bx+2],es
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pop ds bx ax
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sti
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ret
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;met ds:si le handle de l'int bx
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getint:
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push ax bx es
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shl bx,2
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xor ax,ax
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mov es,ax
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mov si,es:[bx]
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mov ds,es:[bx+2]
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pop es bx ax
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ret
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;Recherchele fichier et retourne sont path et en cx sont debut
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Searchfile:
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push bx dx si di ds es
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xor dx,dx
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push cs
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pop es
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mov di,offset temp
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mov bx,offset buffer
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call asciiztofit
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mov cx,13
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check:
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call readsector
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jc errorboot
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xor di,di
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findnext:
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cmp byte ptr [bx+di],0
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je errorboot
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push si di cx
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mov si,di
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add si,bx
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mov di,offset temp
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mov cx,12+4
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rep cmpsb
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pop cx di si
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je oksystem
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add di,32
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||
inc dx
|
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cmp dx,nbfit
|
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ja errorboot
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cmp di,sizec
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jb findnext
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||
inc cx
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jmp Check
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oksystem:
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mov cx,[di+BX+26]
|
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errorboot:
|
||
pop es ds di si dx bx
|
||
ret
|
||
|
||
;->name ds:si ->es:di
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||
AsciiZtoFit:
|
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push ax bx cx dx si di ds es
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xor bx,bx
|
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mov dx,di
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||
noextens:
|
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mov al,[si+bx]
|
||
cmp al,'.'
|
||
je extens
|
||
call Issystchar
|
||
jc errortranslate
|
||
mov es:[di],al
|
||
inc di
|
||
inc bx
|
||
cmp bx,namesize ;(.)
|
||
jne noextens
|
||
erro:
|
||
stc
|
||
jmp errortranslate
|
||
extens:
|
||
add si,bx
|
||
inc si
|
||
sub bx,namesize
|
||
neg bx
|
||
mov al,0
|
||
mov cx,bx
|
||
cld
|
||
rep stosb
|
||
xor bx,bx
|
||
wasextens:
|
||
mov al,[si+bx]
|
||
cmp al,0
|
||
je endextens
|
||
call Issystchar
|
||
jc errortranslate
|
||
mov es:[di],al
|
||
inc di
|
||
inc bx
|
||
cmp bx,extsize
|
||
jne wasextens
|
||
jmp erro
|
||
endextens:
|
||
sub bx,extsize
|
||
neg bx
|
||
mov al,0
|
||
mov cx,bx
|
||
cld
|
||
rep stosb
|
||
mov si,dx
|
||
mov di,dx
|
||
push es
|
||
pop ds
|
||
mov cx,extsize+namesize
|
||
call uppercaseMEM
|
||
clc
|
||
endtranslate:
|
||
pop es ds di si dx cx bx ax
|
||
ret
|
||
errortranslate:
|
||
stc
|
||
jmp endtranslate
|
||
|
||
;Carry si al = caract<63>re syst<73>me
|
||
isSystchar:
|
||
push di
|
||
mov di,offset exeptchar
|
||
isexcept:
|
||
cmp al,cs:[di]
|
||
je nogood
|
||
inc di
|
||
cmp byte ptr cs:[di],0
|
||
jne isexcept
|
||
endanal:
|
||
pop di
|
||
ret
|
||
exeptchar db '/\<>:|.',01,0,0
|
||
nogood:
|
||
stc
|
||
jmp endanal
|
||
|
||
;Transforme les x caract<63>res de la mem en ds:si en maj
|
||
uppercaseMEM:
|
||
push si di cx ax
|
||
mov di,si
|
||
uppercaser:
|
||
mov al,ds:[si]
|
||
inc si
|
||
cmp al,'A'
|
||
jb nonmaj
|
||
cmp al,'Z'
|
||
ja nonmaj
|
||
add al,'a'-'A'
|
||
nonmaj:
|
||
mov es:[di],al
|
||
inc di
|
||
dec cx
|
||
jnz uppercaser
|
||
enduppercase:
|
||
clc
|
||
pop ax cx di si
|
||
ret
|
||
|
||
namesize equ 12
|
||
extsize equ 5
|
||
|
||
|
||
nbfit equ 255
|
||
mouse db 'mouse.sys',0
|
||
pic db 'pic8259a.sys',0
|
||
drive db 'drive.sys',0
|
||
timer db 'timer.sys',0
|
||
lpt db 'lpt.sys',0
|
||
video db 'video.sys',0
|
||
keyboard db 'keyboard.sys',0
|
||
temp db 12+5+1 dup (0)
|
||
|
||
DiskSectorsPerTrack dw 18
|
||
DiskTracksPerHead dw 80
|
||
DiskHeads dw 2
|
||
|
||
fatway equ $
|
||
|
||
buffer equ $+3000
|
||
end start
|