238 lines
4.4 KiB
NASM
238 lines
4.4 KiB
NASM
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.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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jmp tsr
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db 'PIC8259A'
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Tsr:
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cli
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cmp ax,1234h
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jne nomore
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mov ax,4321h
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jmp itsok
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nomore:
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push bx
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mov bl,ah
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xor bh,bh
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shl bx,1
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mov bx,cs:[bx].tables
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mov cs:current,bx
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pop bx
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call cs:current
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itsok:
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jnc noerror
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push bp
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mov bp,sp
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or byte ptr [bp+6],1b
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pop bp
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mov ax,cs
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shl eax,16
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mov ax,cs:current
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jmp endofint
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noerror:
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push bp
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mov bp,sp
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and byte ptr [bp+6],0FEh
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pop bp
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endofint:
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sti
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iret
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current dw 0
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tables dw enableirq
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dw disableirq
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dw readmaskirq
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dw readirr
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dw readisr
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dw installhandler
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dw replacehandler
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dw getint
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dw setint
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dw seteoi
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;Adresses de port du contr<74>leur IRQ
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MASTERPIC = 020h ;Adresse de base du PIC ma<6D>tre
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SLAVEPIC = 0A0h ;Adresse de base du PIC esclave
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IRQMASK = 001h ;Offset sur port de masquage
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;Commandes IRQ OCW2
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DISABLEROTATION = 000h ;Desactiver la rotation de priorit<69>s en mode EOI automatique
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EOI = 020h ;End of Interrupt non sp<73>cifi<66>
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COMMANDEOI = 060h ;Commande EOI particuli<6C>re
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ENABLEROTATION = 080h ;Activer la rotation de priorit<69>s en mode EOI automatique
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ROTATIONNOSPEC = 0A0h ;Rotation des priorit<69>s en mode EOI automatique
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SETPRIORITY = 0C0h ;Definir la priorit<69>
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ROTATIONSPEC = 0E0h ;Rotation des priorit<69>s en mode EOI sp<73>cifi<66>
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;Position des vecteurs d'interruptions
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MASTERFIRSTVECTOR = 008h ;Vecteurs logiciels des interruptions
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SLAVEFIRSTVECTOR = 070h ;<3B>lectroniques
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;OCW3 codes registres
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IRR = 002h ;Interrupt Request Register
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ISR = 003h ;In Service Register
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;OCW3 et modes
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OCW3 = 008h ;OCW3
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POLLING = 004h ;Polling bit
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ISR = 0Bh ; Pas d'op<6F>ration, pas de Poll, lire ISR OCW3
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IRR = 0Ah ; Pas d'op<6F>ration, pas de Poll, lire IRR
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;Autorise une interruption <20>lectronique
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;Entr<74>e : AL - Num<75>ro de l'interruption (0-15) <20> autoriser 0-7 = MASTERPIC , 8-15 = SLAVEPIC
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EnableIRQ:
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push ax cx dx
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mov dx,MASTERPIC+IRQMASK
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cmp al,7
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jbe master
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mov dx,SLAVEPIC+IRQMASK
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master:
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mov cl,al
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and cl,7
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mov al,1
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shl al,cl
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not al
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mov ah,al
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in al,dx
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and al,ah
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out dx,al
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pop dx cx ax
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ret
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;Desactive une interruption <20>lectronique
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;Entr<74>e : AL - Num<75>ro de l'interruption (0-15) <20> desactiver 0-7 = MASTERPIC , 8-15 = SLAVEPIC
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DisableIRQ:
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push ax cx dx
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mov dx,MASTERPIC+IRQMASK
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cmp al,7
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jbe master2
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mov dx,SLAVEPIC+IRQMASK
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master2:
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mov cl,al
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and cl,7
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mov al,1
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shl al,cl
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mov ah,al
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in al,dx
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or al,ah
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out dx,al
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pop dx cx ax
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ret
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;Signale "End Of Interrupt" de l'interruption al
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SetEOI:
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push ax dx
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cmp al,7
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jbe master3
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mov al,EOI
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out SLAVEPIC,al
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master3:
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mov al,EOI
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out MASTERPIC,al
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pop dx ax
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ret
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;Lit les masques d'un contr<74>leur IRQ dans al, 0 master ou slave 1 ds bh
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ReadmaskIrq:
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push dx
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mov dx,MASTERPIC+ IRQMASK
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cmp bh,0
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jne Master5
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mov dx,SLAVEPIC+ IRQMASK
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master5:
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in al,dx
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pop dx
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ret
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;Lit le registre d'<27>tat d'un contr<74>leur IRQ dans al, 0 master ou slave 1 ds bh
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ReadISR:
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push dx
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mov dx,MASTERPIC
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cmp bh,0
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jne Master6
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mov dx,SLAVEPIC
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master6:
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mov al,isr
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out dx,al
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in al,dx
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pop dx
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ret
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;Lit le registre d'<27>tat d'un contr<74>leur IRQ dans al, 0 master ou slave 1 ds bh
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ReadIRR:
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push dx
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mov dx,MASTERPIC
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cmp bh,0
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jne Master7
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mov dx,SLAVEPIC
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master7:
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mov al,irr
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out dx,al
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in al,dx
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pop dx
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ret
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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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mov ah,4
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int 48h
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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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mov ah,4
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int 48h
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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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;met es:di le handle de l'int al
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setint:
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push ax bx ds
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call disableirq
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cli
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xor ah,ah
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mov bx,ax
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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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call enableirq
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ret
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;met ds:si le handle de l'int al
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getint:
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push ax bx es
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xor ah,ah
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mov bx,ax
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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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end start
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