446 lines
8.7 KiB
NASM
446 lines
8.7 KiB
NASM
.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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include ..\include\mem.h
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include ..\include\divers.h
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start:
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maxfunc equ 10
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jmp tsr ;Saute à la routine résidente
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nameed db 'MB' ;Nom drivers
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id dw 1234h ;Identifiant drivers
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Tsr:
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cli ;Désactive interruptions logiciellement
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cmp ax,cs:ID ;Compare si test de chargement
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jne nomore ;Si pas test alors on continu
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rol ax,3*4 ;Rotation de 3 chiffre de l'ID pour montrer que le drivers est chargé
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jmp itsok ;On termine l'int avec notre code d'ID preuve du bon chargement de VIDEO
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nomore:
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cmp ah,maxfunc
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jbe noerrorint
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stc
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jmp itsok
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noerrorint:
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clc
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push bx
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mov bl,ah ;On calcule d'aprés le n° de fonction
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xor bh,bh ;quel sera l'entrée dans la table indexée
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shl bx,1 ;des adresses fonctions.
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mov bx,cs:[bx+tables] ;On récupère cette adresse depuis la table
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mov cs:current,bx ;On la stocke temporairement pour obtenir les registres d'origine
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pop bx
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clc
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call cs:current ;Puis on execute la fonction
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itsok:
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push bp
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mov bp,sp ;On prend sp dans bp pour adresser la pile
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jnc noerror ;La fonction appelée a renvoyer une erreur : Flag CARRY ?
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or byte ptr [bp+6],1b;Si oui on le retranscrit sur le registre FLAG qui sera dépilé lors du IRET
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;xor eax,eax
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;mov ax,cs ;On récupère le segment et l'offset puis en renvoie l'adresse physique
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;shl eax,4 ;de l'erreur.
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;add ax,cs:current
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jmp endofint ;on termine l'int
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noerror:
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and byte ptr [bp+6],0FEh;Si pas d'erreur on efface le Bit CARRY du FLAG qui sera dépilé lors du IRET
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endofint:
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pop bp
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sti ;On réactive les interruptions logiciellement
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iret ;Puis on retourne au programme appelant.
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current dw 0 ;Mot temporaire qui contient l'adresse de la fonction appelée
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tables dw MBinit ;Table qui contient les adresses de toutes les fonctions de VIDEO (WORD)
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dw MBFree
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dw MBCreate
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dw MBresident
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dw MBGet
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dw MBFind
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dw MBChown
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dw MBAlloc
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dw MBclean
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dw MBfindsb
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FirstMB dw 0
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;Mise a nivo de la mémoire (jonction de blocs libre)
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MBclean:
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push ax bx dx es gs
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mov bx,cs:firstmb
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dec bx
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dec bx
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xor ax,ax
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xor dx,dx
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searchfree3:
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mov gs,bx
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cmp gs:[MB.Check],'NH'
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jne erroronsearch
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inc bx
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inc bx
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add bx,gs:[MB.Sizes]
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cmp word ptr gs:[MB.Sizes],0
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je erroronsearch
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cmp gs:[MB.Reference],Free
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jne notfreeatall
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cmp ax,0
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je notmeetafree
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add dx,gs:[MB.Sizes]
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mov word ptr gs:[MB.Check],0
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mov dword ptr gs:[MB.Names],0
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mov dword ptr gs:[MB.Names+4],0
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inc dx
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inc dx
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jmp nottrigered
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notmeetafree:
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xor dx,dx
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mov ax,gs
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jmp nottrigered
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notfreeatall:
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cmp ax,0
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je nottrigered
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mov es,ax
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add es:[MB.Sizes],dx
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xor ax,ax
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nottrigered:
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cmp gs:[MB.IsNotLast],true
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je searchfree3
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cmp ax,0
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je reallyfinish
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mov es,ax
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add es:[MB.Sizes],dx
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mov es:[MB.IsNotLast],False
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reallyfinish:
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clc
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pop gs es dx bx ax
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ret
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erroronsearch:
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stc
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pop gs es dx bx ax
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ret
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;Initialise les blocs de mémoire en prenant memorystart pour segment de base
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MBinit:
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push ax cx es
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cmp cs:FirstMB,0
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jne notforfree
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mov ax,memorystart
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mov cs:Firstmb,ax
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mov cx,0A000h
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sub cx,ax
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dec ax
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dec ax
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mov es,ax
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cmp es:[MB.Check],'NH'
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je notforfree
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mov es:[MB.Reference],Free
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mov es:[MB.Sizes],cx
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mov es:[MB.Check],'NH'
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mov dword ptr es:[MB.Names],'eerF'
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mov dword ptr es:[MB.Names+4],0
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mov es:[MB.IsNotLast],False
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clc
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pop es cx ax
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ret
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notforfree:
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stc
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pop es cx ax
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ret
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;Libère le bloc de mémoire GS
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MBFree:
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push ax bx es
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mov bx,gs
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mov ax,bx
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dec bx
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dec bx
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mov es,bx
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cmp es:[MB.Reference],Free
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je wasfree
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cmp es:[MB.IsResident],true
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je wasfree
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mov es:[MB.IsResident],false
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mov es:[MB.Reference],Free
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mov dword ptr es:[MB.Names],'eerF'
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mov dword ptr es:[MB.Names+4],0
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mov bx,cs:firstmb
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dec bx
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dec bx
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searchtofree:
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mov gs,bx
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cmp gs:[MB.Check],'NH'
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jne wasfree
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inc bx
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inc bx
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add bx,gs:[MB.Sizes]
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cmp word ptr gs:[MB.Sizes],0
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je wasfree
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cmp ax,gs:[MB.Reference]
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jne nottofree
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mov gs:[MB.IsResident],false
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mov gs:[MB.Reference],Free
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mov dword ptr gs:[MB.Names],'eerF'
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mov dword ptr gs:[MB.Names+4],0
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nottofree:
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cmp gs:[MB.IsNotLast],true
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je searchtofree
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call MBclean
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pop es bx ax
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ret
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wasfree:
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stc
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pop es bx ax
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ret
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;Change le proprietaire de GS a dx
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MBChown:
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push bx es
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mov bx,gs
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dec bx
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dec bx
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mov es,bx
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cmp es:[MB.Reference],Free
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je wasfree2
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mov es:[MB.Reference],dx
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pop es bx
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ret
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wasfree2:
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stc
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pop es bx
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ret
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;Alloue un bloc de CX caractere pour le process visé -> GS
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MBAlloc:
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push dx si bp ds
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mov bp,sp
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mov dx,ss:[bp+12]
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push cs
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pop ds
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mov si,offset data
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call MBCreate
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call MBChown
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pop ds bp si dx
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ret
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data db '/Data',0
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;Renvoie en GS le MB n° cx carry quand terminé
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MBGet:
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push bx dx
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mov bx,cs:firstmb
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dec bx
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dec bx
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xor dx,dx
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searchfree2:
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mov gs,bx
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cmp gs:[MB.Check],'NH'
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jne itsend
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inc bx
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inc bx
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add bx,gs:[MB.Sizes]
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cmp word ptr gs:[MB.Sizes],0
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je itsend
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cmp dx,cx
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je foundmcb
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ja itsend
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inc dx
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cmp gs:[MB.IsNotLast],true
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je searchfree2
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itsend:
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stc
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pop dx bx
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ret
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foundmcb:
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clc
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pop dx bx
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ret
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;Renvoie en GS le MCB qui correspond a ds:si
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MBFind:
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push ax bx si di
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mov bx,cs:firstmb
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dec bx
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dec bx
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mov di,MB.Names
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search:
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mov gs,bx
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cmp gs:[MB.Check],'NH'
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jne itsend2
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inc bx
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inc bx
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add bx,gs:[MB.Sizes]
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cmp word ptr gs:[MB.Sizes],0
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je itsend2
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push si di
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cmpnames:
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mov al,gs:[di]
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cmp al,ds:[si]
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jne ok
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cmp al,0
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je ok
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inc si
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inc di
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jmp cmpnames
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ok:
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pop di si
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je foundmcb2
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cmp gs:[MB.IsNotLast],true
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je search
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itsend2:
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stc
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pop di si bx ax
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ret
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foundmcb2:
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mov bx,gs
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inc bx
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inc bx
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mov gs,bx
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clc
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pop di si bx ax
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ret
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;Renvoie en GS le sous mcb qui correspond a ds:si et qui appartien a dx
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MBFindsb:
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push ax bx si di
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mov bx,cs:firstmb
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dec bx
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dec bx
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mov di,MB.Names
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search2:
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mov gs,bx
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cmp gs:[MB.Check],'NH'
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jne itsend3
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inc bx
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inc bx
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add bx,gs:[MB.Sizes]
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cmp word ptr gs:[MB.Sizes],0
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je itsend3
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push si di
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cmpnames2:
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mov al,gs:[di]
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cmp al,ds:[si]
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jne ok2
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cmp al,0
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je ok2
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inc si
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inc di
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jmp cmpnames2
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ok2:
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pop di si
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jne notfoundmcb2
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cmp gs:[MB.Reference],dx
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je foundmcb3
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notfoundmcb2:
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cmp gs:[MB.IsNotLast],true
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je search2
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itsend3:
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stc
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pop di si bx ax
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ret
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foundmcb3:
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mov bx,gs
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inc bx
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inc bx
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mov gs,bx
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clc
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pop di si bx ax
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ret
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;Creér un bloc de nom ds:si de taille cx (octets) -> n°segment dans GS
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MBCreate:
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push bp
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mov bp,sp
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mov gs,ss:[bp+6]
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push ax bx cx dx si di es
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shr cx,4
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inc cx
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mov bx,cs:firstmb
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dec bx
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dec bx
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mov dl,1
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searchfree:
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cmp dl,False
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je wasntgood
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mov es,bx
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cmp es:[MB.Check],'NH'
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jne wasntgood
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cmp es:[MB.IsNotLast],True
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sete dl
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cmp es:[MB.Reference],Free
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jne notsogood
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mov ax,es:[MB.Sizes]
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cmp cx,ax
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ja notsogood
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mov word ptr es:[MB.Check],'NH'
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mov es:[MB.IsNotLast],True
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mov es:[MB.Reference],gs
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mov es:[MB.IsResident],False
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mov di,MB.Names
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push ax cx
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mov cx,32
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loops:
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mov dh,[si]
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inc si
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dec cx
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jz endofloops
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cmp dh,0
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je endofloops
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mov es:[di],dh
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inc di
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jmp loops
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endofloops:
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inc cx
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mov al,0
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rep stosb
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pop cx ax
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inc bx
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inc bx
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sub ax,cx
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dec ax
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dec ax
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cmp ax,0
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je nofree
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mov es:[MB.Sizes],cx
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add cx,bx
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mov es,cx
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mov es:[MB.IsNotLast],dl
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mov es:[MB.IsResident],False
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mov es:[MB.Reference],Free
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mov es:[MB.Sizes],ax
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mov dword ptr es:[MB.Names],'eerF'
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mov dword ptr es:[MB.Names+4],0
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mov es:[MB.Check],'NH'
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nofree:
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mov gs,bx
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clc
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pop es di si dx cx bx ax
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pop bp
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ret
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wasntgood:
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stc
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pop es di si dx cx bx ax
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pop bp
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ret
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notsogood:
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inc bx
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inc bx
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add bx,es:[MB.Sizes]
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jmp searchfree
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;Rend le segment GS résident
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MBresident:
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push bx es
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mov bx,gs
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dec bx
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dec bx
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mov es,bx
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mov es:[MB.IsResident],True
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pop es bx
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ret
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end start
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