732 lines
15 KiB
NASM
732 lines
15 KiB
NASM
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db "biosprint",0
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dw biosprint
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db "mbinit",0
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dw mbinit
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db "mbcreate",0
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dw mbcreate
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db "mbfree",0
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dw mbfree
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db "mbclean",0
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dw mbclean
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db "mbresident",0
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dw mbresident
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db "mbnonresident",0
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dw mbnonresident
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db "mbchown",0
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dw mbchown
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db "mballoc",0
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dw mballoc
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db "mbfind",0
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dw mbfind
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db "mbfindsb",0
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dw mbfindsb
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db "mbget",0
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dw mbget
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db "mbloadfuncs",0
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dw mbloadfuncs
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db "mbsearchfunc",0
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dw mbsearchfunc
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db "bioswaitkey",0
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dw bioswaitkey
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db "mbloadsection",0
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dw mbloadsection
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db "enableirq",0
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dw enableirq
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db "disableirq",0
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dw enableirq
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db "readmaskirq",0
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dw readmaskirq
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db "readirr",0
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dw readirr
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db "readisr",0
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dw readisr
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db "seteoi",0
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dw seteoi
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dd 0
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include "8259a.asm"
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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 flatmode FAR
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; USES eax,bx,edx
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; ; first, calculate the linear address of GDT
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; xor edx,edx
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; xor eax,eax
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; mov dx,cs
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; shl edx,4
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; add [dword ptr cs:offset @@gdt+2],edx ; store as GDT linear base addr
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; ; now load the GDT into the GDTR
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; lgdt [fword ptr cs:offset @@gdt] ; load GDT base (286-style 24-bit load)
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; mov bx,1 * size descriptor ; point to first descriptor
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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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; cli ; turn off interrupts
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; mov cr0,eax ; we're now in protected mode
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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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; sti ; resume handling interrupts
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; ret ;
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;@@gdt descriptor <@@gdtend - @@gdt - 1, @@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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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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inc ax
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inc ax
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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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@@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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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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pushad
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xor eax,eax
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mov ax,[word ptr ss:si]
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call biosprinth,eax
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popad
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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 gs,[ss:bp+4]
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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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push cs
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pop ds
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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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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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clc
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pop gs
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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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stc
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pop gs
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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
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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:
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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 @@searchfree
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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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ret
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@@notenougtmem:
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stc
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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 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
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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],false
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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 mbnonresident
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;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]
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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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mov dx,[@owner]
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mov [es:mb.reference],dx
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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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endp mbchown
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;Alloue un bloc /data de CX caractere pour le process appelant -> ax
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PROC mballoc FAR
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ARG @size:word
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USES ax,si,ds
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push cs
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pop ds
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call mbcreate,offset @@data,[@size]
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call mbchown,ax,[word ptr ss:bp+4]
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ret
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@@data db '/data',0
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endp mballoc
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;Renvoie en AX le MB n° %0 carry quand terminé
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PROC mbget FAR
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ARG @num:word
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USES bx,dx,es
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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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@@searchfree:
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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 @@memoryerror
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cmp dx,[@num]
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je @@foundmcb
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ja @@notfound
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inc dx
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cmp [es:mb.isnotlast],true
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je @@searchfree
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@@memoryerror:
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stc
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ret
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@@foundmcb:
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mov ax,es
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inc ax
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inc ax
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clc
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ret
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@@notfound:
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stc
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ret
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endp mbget
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;Renvoie en AX le MCB qui correspond a ds:%0
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PROC mbfind FAR
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ARG @blocks:word
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USES bx,si,di,es
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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 si,[@blocks]
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lea di,[es:mb.names]
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@@search:
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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 @@memoryerror
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push si di
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@@cmpnames:
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mov al,[es: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 @@foundmcb
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cmp [es:mb.isnotlast],true
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je @@search
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@@notfound:
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stc
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ret
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@@memoryerror:
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stc
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ret
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@@foundmcb:
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mov ax,es
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inc ax
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inc ax
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clc
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ret
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endp mbfind
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;Renvoie en AX le sous mcb qui correspond a %0 et qui appartien a %1
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PROC mbfindsb FAR
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ARG @blocks:word,@owner:word
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USES bx,dx,si,di,es
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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 si,[@blocks]
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lea di,[es:mb.names]
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mov dx,[@owner]
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@@search:
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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 @@memoryerror
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push si di
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@@cmpnames:
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mov al,[es: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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jne @@notfoundmcb
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cmp [es:mb.reference],dx
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je @@foundmcb
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@@notfoundmcb:
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cmp [es:mb.isnotlast],true
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je @@search
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@@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
|
|
@@findend:
|
|
inc bx
|
|
cmp [byte ptr bx], ':'
|
|
jne @@findend
|
|
mov [byte ptr bx],0
|
|
;call projectfile,bx
|
|
jc @@erroronload
|
|
mov [byte ptr bx],':'
|
|
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:SI en mémoire et renvoie son adresse en DX:AX
|
|
PROC mbsearchfunc FAR
|
|
ARG @func:word
|
|
USES bx,si,di,es
|
|
mov bx,[@func]
|
|
push bx
|
|
@@findend:
|
|
inc bx
|
|
cmp [byte ptr bx], ':'
|
|
jne @@findend
|
|
mov [byte ptr bx],0
|
|
call mbfind
|
|
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
|