748 lines
15 KiB
NASM
748 lines
15 KiB
NASM
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;Affiche le nombre hexa dans %0[dword]
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PROC biosprinth FAR
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ARG @num:dword
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USES ax,bx,cx,edx,si,di
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mov edx,[@num]
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mov ah,09h
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mov di,8
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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,[cs:si+offset @@tab]
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mov cx,1
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cmp al,32
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jb @@control
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mov bx,7
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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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dec di
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jnz @@hexaize
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ret
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@@tab db '0123456789ABCDEF'
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endp biosprinth
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;Affiche le texte ASCIIZ pointé par %0
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PROC biosprint FAR
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ARG @pointer:word
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USES ax,bx,cx,si
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mov si,[@pointer]
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mov cx,1
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mov bx,7
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@@again:
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lodsb
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or al,al
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jz @@fin
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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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ret
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endp biosprint
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PROC enablea20 FAR
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USES ax
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mov al,0d1h
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out 64h,al
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call a20wait
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mov al,0dfh
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out 60h,al
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call a20wait
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;mov al,0ffh
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;out 64h,al
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;call a20wait
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ret
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endp enablea20
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PROC disablea20 FAR
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USES ax
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mov al,0d1h
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out 64h,al
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call a20wait
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mov al,0DDh
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out 60h,al
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call a20wait
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;mov al,0ffh
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;out 64h,al
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;call a20wait
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ret
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endp disablea20
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a20wait:
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in al,64h
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jmp @@suite
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@@suite:
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and al,2
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jnz a20wait
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ret
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;par le system control port A
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;in al,92h
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;or al,2
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;out 92h,al
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;par le system control port A
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;in al,92h
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;and al,not 2
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;out 92h,al
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PROC flatmode FAR
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USES eax,bx,ds
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push cs
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pop ds
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; first, calculate the linear address of GDT
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xor eax,eax
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mov ax,ds
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shl eax,4
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add [dword ptr offset @@gdt+2],eax ; store as GDT linear base addr
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; now load the GDT into the GDTR
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lgdt [fword ptr offset @@gdt] ; load GDT base
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mov bx,1 * size descriptor ; point to first descriptor
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cli ; turn off interrupts
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mov eax,cr0 ; prepare to enter protected mode
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or al,1 ; flip the PE bit
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mov cr0,eax ; we're now in protected mode
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jmp @@suite
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@@suite:
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mov fs,bx ; load the FS segment register
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and al,0FEh ; clear the PE bit again
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mov cr0,eax ; back to real mode
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jmp @@suite2
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@@suite2:
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sti ; resume handling interrupts
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ret ;
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@@gdt descriptor <offset @@gdtend - offset @@gdt - 1, offset @@gdt, 0, 0, 0, 0> ; the GDT itself
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descriptor <0ffffh, 0, 0, 091h, 0cfh, 0> ; 4G data segment
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@@gdtend:
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endp flatmode
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;Attend l'appuie sur une touche
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PROC bioswaitkey FAR
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USES ax
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xor ax,ax
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int 16h
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ret
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endp bioswaitkey
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firstmb dw 0
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;Charge les sections du block %0
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PROC mbloadsection FAR
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ARG @blocks:word
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USES ax,bx,cx,si,di,ds,es
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LOCAL @@toresov:word:60
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mov ax,[@blocks]
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mov es,ax
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mov ds,ax
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cmp [word ptr 0],"EC"
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jne @@notace
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lea si,[@@toresov]
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mov [word ptr ss:si],0FFFFh
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mov bx,[ds:exe.sections]
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cmp bx,0
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je @@finishloading
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@@loading:
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cmp [dword ptr bx],0
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je @@finishloading
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mov ax,bx
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add ax,4
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pushad
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call biosprint,ax
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popad
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call mbcreate,ax,[word ptr bx+2]
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jc @@error
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inc si
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inc si
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mov [ss:si],ax
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push si
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mov si,[bx]
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xor di,di
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mov es,ax
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mov cx,[bx+2]
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cld
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rep movsb
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pop si
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add bx,4
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@@gonext:
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inc bx
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cmp [byte ptr bx],0
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jne @@gonext
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inc bx
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jmp @@loading
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@@finishloading:
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cmp [word ptr ss:si],0FFFFh
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je @@finishdepands
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call mbloadfuncs,[word ptr ss:si]
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jc @@depandserror
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dec si
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dec si
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jmp @@finishloading
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@@finishdepands:
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ret
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@@notace:
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stc
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ret
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@@error:
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stc
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ret
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@@depandserror:
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stc
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ret
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endp mbloadsection
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;Initialise les blocs de mémoire en prenant memorystart pour segment de base
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PROC mbinit FAR
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USES ax,cx,si,di,ds,es
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cmp [cs:firstmb],0
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jne @@alreadyok
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push cs
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pop ds
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mov [cs:firstmb],memorystart
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mov ax,memorystart-2
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mov es,ax
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mov si,offset afree
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xor di,di
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mov cx,size mb
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rep movsb
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clc
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ret
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@@alreadyok:
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stc
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ret
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endp mbinit
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afree mb <"HN",0,0,0,0A000h-memorystart,"Libre">
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db 0
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;Creér un bloc de nom %0 de taille %1 (octets) -> n°segment dans AX
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PROC mbcreate FAR
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ARG @blocks:word,@size:word
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USES bx,cx,dx,si,di,ds,es
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push gs
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mov ax,[ss:bp+4]
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mov dx,ax
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dec dx
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dec dx
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mov gs,dx
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cmp [word ptr gs:0x0],'NH'
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je @@oktoset
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mov ax,memorystart
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@@oktoset:
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mov gs,ax
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mov cx,[@size]
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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,true
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@@searchfree:
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cmp dl,false
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je @@notenougtmem
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mov es,bx
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cmp [word ptr es:mb.check],"NH"
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jne @@memoryerror
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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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lea di,[es:mb.names]
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push cx
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mov cx,24/4
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mov si,[@blocks]
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cld
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rep movsd
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pop cx
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inc bx
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inc bx
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sub ax,cx
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cmp ax,0
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je @@nofree
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dec ax
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dec ax
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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 si,offset afree
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xor di,di
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mov cx,size mb
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push cs
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pop ds
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cld
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rep movsb
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mov [es:mb.isnotlast],dl
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mov [es:mb.sizes],ax
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@@nofree:
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mov ax,bx
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pop gs
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clc
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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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@@memoryerror:
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pop gs
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stc
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ret
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@@notenougtmem:
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pop gs
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stc
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ret
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endp mbcreate
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;Libère le bloc de mémoire %0 et ses sous blocs
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PROC mbfree FAR
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ARG @blocks:word
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USES ax,bx,cx,si,di,ds,es
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mov bx,[@blocks]
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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 [word ptr es:mb.check],"NH"
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jne @@memoryerror
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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 @@wasresident
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mov [es:mb.reference],free
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push cs
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pop ds
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mov si,offset @@isfree
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lea di,[es:mb.names]
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mov cx,6
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cld
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rep movsb
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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 es,bx
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cmp [word ptr es:mb.check],"NH"
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jne @@memoryerror
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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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cmp [es:mb.sizes],0
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je @@nottofree
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cmp ax,[es:mb.reference]
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jne @@nottofree
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mov [es:mb.isresident],false
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mov [es:mb.reference],free
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mov cx,6
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cld
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rep movsb
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@@nottofree:
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cmp [es:mb.isnotlast],true
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je @@searchtofree
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call mbclean
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ret
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@@memoryerror:
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stc
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ret
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@@wasfree:
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stc
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ret
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@@wasresident:
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stc
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ret
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@@isfree db "libre",0
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endp mbfree
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;Mise a nivo de la mémoire (jonction de blocs libre)
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PROC mbclean FAR
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USES 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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@@searchfree:
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|
mov gs,bx
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cmp [word ptr gs:mb.check],"NH"
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|
jne @@memoryerror
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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
|
|
je @@notenougtmem
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cmp [gs:mb.reference],free
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|
jne @@notfree
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cmp ax,0
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|
je @@notmeetfree
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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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inc dx
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inc dx
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jmp @@nottrigered
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@@notmeetfree:
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|
xor dx,dx
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mov ax,gs
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|
jmp @@nottrigered
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@@notfree:
|
|
cmp ax,0
|
|
je @@nottrigered
|
|
mov es,ax
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add [es:mb.sizes],dx
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|
xor ax,ax
|
|
@@nottrigered:
|
|
cmp [gs:mb.isnotlast],true
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|
je @@searchfree
|
|
cmp ax,0
|
|
je @@reallyfinish
|
|
mov es,ax
|
|
add [es:mb.sizes],dx
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|
mov [es:mb.isnotlast],false
|
|
@@reallyfinish:
|
|
clc
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|
ret
|
|
@@notenougtmem:
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stc
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|
ret
|
|
@@memoryerror:
|
|
stc
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|
ret
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endp mbclean
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;Rend le segment %0 résident
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PROC mbresident FAR
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ARG @blocks:word
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USES bx,es
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mov bx,[@blocks]
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dec bx
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dec bx
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|
mov es,bx
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cmp [word ptr es:mb.check],"NH"
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jne @@memoryerror
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mov [es:mb.isresident],true
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ret
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@@memoryerror:
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stc
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|
ret
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endp mbresident
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;Rend le segment %0 non résident
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PROC mbnonresident FAR
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ARG @blocks:word
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USES bx,es
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mov bx,[@blocks]
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|
dec bx
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|
dec bx
|
|
mov es,bx
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cmp [word ptr es:mb.check],"NH"
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jne @@memoryerror
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mov [es:mb.isresident],false
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|
ret
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@@memoryerror:
|
|
stc
|
|
ret
|
|
endp mbnonresident
|
|
|
|
|
|
;Change le proprietaire de %0 a %1
|
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PROC mbchown FAR
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ARG @blocks:word,@owner:word
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USES bx,dx,es
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|
mov bx,[@blocks]
|
|
dec bx
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|
dec bx
|
|
mov es,bx
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|
cmp [word ptr es:mb.check],"NH"
|
|
jne @@memoryerror
|
|
cmp [es:mb.reference],free
|
|
je @@wasfree
|
|
mov dx,[@owner]
|
|
mov [es:mb.reference],dx
|
|
ret
|
|
@@memoryerror:
|
|
stc
|
|
ret
|
|
@@wasfree:
|
|
stc
|
|
ret
|
|
endp mbchown
|
|
|
|
;Alloue un bloc /data de CX caractere pour le process appelant -> ax
|
|
PROC mballoc FAR
|
|
ARG @size:word
|
|
USES si,ds
|
|
push cs
|
|
pop ds
|
|
call mbcreate,offset @@data,[@size]
|
|
call mbchown,ax,[word ptr ss:bp+2]
|
|
ret
|
|
|
|
@@data db '/data',0
|
|
endp mballoc
|
|
|
|
;Renvoie en AX le MB n° %0 carry quand terminé
|
|
PROC mbget FAR
|
|
ARG @num:word
|
|
USES bx,dx,es
|
|
mov bx,[cs:firstmb]
|
|
dec bx
|
|
dec bx
|
|
xor dx,dx
|
|
@@searchfree:
|
|
mov es,bx
|
|
cmp [word ptr es:mb.check],"NH"
|
|
jne @@memoryerror
|
|
inc bx
|
|
inc bx
|
|
add bx,[es:mb.sizes]
|
|
cmp [es:mb.sizes],0
|
|
je @@memoryerror
|
|
cmp dx,[@num]
|
|
je @@foundmcb
|
|
ja @@notfound
|
|
inc dx
|
|
cmp [es:mb.isnotlast],true
|
|
je @@searchfree
|
|
@@memoryerror:
|
|
stc
|
|
ret
|
|
@@foundmcb:
|
|
mov ax,es
|
|
inc ax
|
|
inc ax
|
|
clc
|
|
ret
|
|
@@notfound:
|
|
stc
|
|
ret
|
|
endp mbget
|
|
|
|
;Renvoie en AX le MCB qui correspond a ds:%0
|
|
PROC mbfind FAR
|
|
ARG @blocks:word
|
|
USES bx,si,di,es
|
|
mov bx,[cs:firstmb]
|
|
dec bx
|
|
dec bx
|
|
mov si,[@blocks]
|
|
@@search:
|
|
mov es,bx
|
|
lea di,[es:mb.names]
|
|
cmp [word ptr es:mb.check],"NH"
|
|
jne @@memoryerror
|
|
inc bx
|
|
inc bx
|
|
add bx,[es:mb.sizes]
|
|
cmp [es:mb.sizes],0
|
|
je @@memoryerror
|
|
push si di
|
|
@@cmpnames:
|
|
mov al,[es:di]
|
|
cmp al,[ds:si]
|
|
jne @@ok
|
|
cmp al,0
|
|
je @@ok
|
|
inc si
|
|
inc di
|
|
jmp @@cmpnames
|
|
@@ok:
|
|
pop di si
|
|
je @@foundmcb
|
|
cmp [es:mb.isnotlast],true
|
|
je @@search
|
|
@@notfound:
|
|
stc
|
|
ret
|
|
@@memoryerror:
|
|
stc
|
|
ret
|
|
@@foundmcb:
|
|
mov ax,es
|
|
inc ax
|
|
inc ax
|
|
clc
|
|
ret
|
|
endp mbfind
|
|
|
|
|
|
;Renvoie en AX le sous mcb qui correspond a %0 et qui appartien a %1
|
|
PROC mbfindsb FAR
|
|
ARG @blocks:word,@owner:word
|
|
USES bx,dx,si,di,es
|
|
mov bx,[cs:firstmb]
|
|
dec bx
|
|
dec bx
|
|
mov si,[@blocks]
|
|
lea di,[es:mb.names]
|
|
mov dx,[@owner]
|
|
@@search:
|
|
mov es,bx
|
|
cmp [word ptr es:mb.check],"NH"
|
|
jne @@memoryerror
|
|
inc bx
|
|
inc bx
|
|
add bx,[es:mb.sizes]
|
|
cmp [es:mb.sizes],0
|
|
je @@memoryerror
|
|
push si di
|
|
@@cmpnames:
|
|
mov al,[es:di]
|
|
cmp al,[ds:si]
|
|
jne @@ok
|
|
cmp al,0
|
|
je @@ok
|
|
inc si
|
|
inc di
|
|
jmp @@cmpnames
|
|
@@ok:
|
|
pop di si
|
|
jne @@notfoundmcb
|
|
cmp [es:mb.reference],dx
|
|
je @@foundmcb
|
|
@@notfoundmcb:
|
|
cmp [es:mb.isnotlast],true
|
|
je @@search
|
|
@@notfound:
|
|
stc
|
|
ret
|
|
@@foundmcb:
|
|
mov ax,es
|
|
inc ax
|
|
inc ax
|
|
clc
|
|
ret
|
|
@@memoryerror:
|
|
stc
|
|
ret
|
|
endp mbfindsb
|
|
|
|
;Resouds les dépendances du bloc de mémoire %0
|
|
PROC mbloadfuncs FAR
|
|
ARG @blocks:word
|
|
USES ax,bx,cx,dx,si,ds
|
|
mov ds,[@blocks]
|
|
cmp [word ptr 0],"EC"
|
|
jne @@notace
|
|
mov si,[ds:exe.imports]
|
|
cmp si,0
|
|
je @@endofloading
|
|
@@loadfuncs:
|
|
cmp [word ptr si],0
|
|
je @@endofloading
|
|
call mbsearchfunc,si
|
|
jnc @@toendoftext
|
|
mov bx,si
|
|
pushad
|
|
call biosprint,si
|
|
popad
|
|
@@findend:
|
|
inc bx
|
|
cmp [byte ptr bx], ':'
|
|
jne @@findend
|
|
mov [byte ptr bx],0
|
|
call [cs:projfile],si
|
|
jc @@erroronload
|
|
mov [byte ptr bx],':'
|
|
pushad
|
|
call biosprint,si
|
|
popad
|
|
call mbsearchfunc,si
|
|
jc @@libnotexist
|
|
@@toendoftext:
|
|
mov cl,[si]
|
|
cmp cl,0
|
|
je @@oktonext
|
|
inc si
|
|
jmp @@toendoftext
|
|
@@oktonext:
|
|
inc si
|
|
mov [si],ax
|
|
mov [si+2],dx
|
|
add si,4
|
|
jmp @@loadfuncs
|
|
@@endofloading:
|
|
clc
|
|
ret
|
|
@@notace:
|
|
stc
|
|
ret
|
|
@@libnotexist:
|
|
stc
|
|
ret
|
|
@@erroronload:
|
|
stc
|
|
ret
|
|
endp mbloadfuncs
|
|
|
|
|
|
;Recherche une fonction pointé par DS:%0 en mémoire et renvoie son adresse en DX:AX
|
|
PROC mbsearchfunc FAR
|
|
ARG @func:word
|
|
USES bx,si,di,es
|
|
mov bx,[@func]
|
|
mov si,bx
|
|
@@findend:
|
|
inc bx
|
|
cmp [byte ptr bx], ':'
|
|
jne @@findend
|
|
mov [byte ptr bx],0
|
|
call mbfind,si
|
|
mov [byte ptr bx],':'
|
|
jc @@notfoundattallthesb
|
|
mov es,ax
|
|
cmp [word ptr es:exe.checks],"EC"
|
|
jne @@notfoundattallthesb
|
|
mov di,[es:exe.exports]
|
|
inc bx
|
|
inc bx
|
|
@@functions:
|
|
cmp [word ptr es:di],0
|
|
je @@notfoundattallthesb
|
|
mov si,bx
|
|
@@cmpnamesfunc:
|
|
mov al,[es:di]
|
|
cmp al,[ds:si]
|
|
jne @@notfoundthesb
|
|
cmp al,0
|
|
je @@seemsok
|
|
inc si
|
|
inc di
|
|
jmp @@cmpnamesfunc
|
|
@@notfoundthesb:
|
|
mov al,[es:di]
|
|
cmp al,0
|
|
je @@oktonext
|
|
inc di
|
|
jmp @@notfoundthesb
|
|
@@oktonext:
|
|
inc di
|
|
inc di
|
|
inc di
|
|
jmp @@functions
|
|
@@seemsok:
|
|
mov dx,es
|
|
mov ax,[es:di+1]
|
|
clc
|
|
ret
|
|
@@notfoundattallthesb:
|
|
stc
|
|
ret
|
|
endp mbsearchfunc
|