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fix init PIC + enable IRQ1 & 12 handeling

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This commit is contained in:
Frater 2026-01-19 22:11:51 +01:00
commit 82724598ee
7 changed files with 438 additions and 288 deletions
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90
src/boot.asm
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@ -29,26 +29,19 @@ bits 16
%define DEBUG_PORT 0xe9 ; 0x402 ou 0xe9
; initial stack
%define STACK_SEG 0x0030 ; compatible avec le BMM (Bios Memory Maps)
%define STACK_TOP 0x0100 ; choix commun en RAM basse (pile descendante)
%define MEM_SEG_DEB 0x0800 ; 0x0800:0000 = 0x8000 (32KB) évite IVT/BDA + stack 7C00
%define MEM_SEG_END 0xA000 ; 0xA000:0000 = 0xA0000 (début zone vidéo)
%define MEM_SEG_STEP 0x0040 ; 1KB = 0x400 bytes = 0x40 paragraphs
%define STACK_SEG 0x1000 ; segment de base
section .text
bits 16
jmp reset ; ce jump n'est pas sensé être executer, il est présent uniquement pour le debug
; definition du BDA
%include "./bda.asm"
%include "./services/macros.asm"
; %include "./services/macros.asm"
%include "./drivers/debug.asm"
%include "./drivers/gfx_cgam.asm"
;%include "./drivers/mouse_ps2.asm"
;%include "./drivers/keyboard_ps2.asm"
%include "./drivers/mouse_ps2.asm"
%include "./drivers/keyboard_ps2.asm"
%include "./services/generic.asm"
err_vganok db 'VGA Not Initialized',0
@ -56,27 +49,29 @@ err_vganok db 'VGA Not Initialized',0
reset:
cli
cld
; il n'existe aucun 'stack' par défaut
mov ax, STACK_SEG
mov ss, ax
mov sp, STACK_TOP ; haut du segment, mot-aligné
; detection de la mémoire totale
call ram_setup
sti
; modification du stack en "haut" de la RAM
mov ax, dx
sub ax, 0x0400 ; réserver les 16 dernier KB
mov ss, ax
mov sp, 0x1000 ; sommet de pile
; initialisation du BDA
call bda_setup
mov sp, 0xFFFE ; haut du segment (64ko de stack), mot-aligné
; installé une table d'interruption "dummy"
call ivt_setup
call bda_setup
; test IRQ 0
mov ax,cs
mov dx,ax
mov bx,test_isr
mov ax,i8259_MASTER_INT
call ivt_setvector
; initialisation des PIC 8259A
call pic_init
; load Roms
call setup_load_rom
@ -87,18 +82,13 @@ reset:
mov ax, 0x0003
int 10h
cli
; initialisation des PIC 8259A
call pic_init
; call kbd_init
; enable IRQ 0
mov ah,IRQ_ENABLED
mov al,0
call pic_set_irq_mask
; test IRQ 0
mov ax,cs
mov dx,ax
mov bx,test_isr
mov ax,i8259_MASTER_INT
call kbd_init
call ivt_setvector
sti
@ -106,18 +96,11 @@ reset:
; call gfx_init
;call mouse_reset
;call mouse_init
call mouse_init
endless:
mov ax,0x0050
mov ax,BDA_DATA_SEG
mov ds,ax
; in al, 0x64
; test al, 1 ; OBF
; jz .no
; in al, 0x60 ; scancode dans AL
; mov byte [0x0001],al
;.no:
mov dx,0
call scr_gotoxy
@ -153,21 +136,22 @@ endless:
; Keyboard ISR (IRQ -> INT)
; -----------------------------------------------------------
test_isr:
pusha
push ds
push ax
push fs
mov ax,0x0050
mov ds,ax
inc byte [0x0005]
mov ax,BDA_DATA_SEG
mov fs,ax
inc byte [fs:0x000F]
inc byte [fs:0x0005]
mov al, PIC_EOI ; EOI master
out i8259_MASTER_CMD, al
pop ds
popa
pop fs
pop ax
iret
; ------------------------------------------------------------------
; Padding jusqu'au reset vector
; ------------------------------------------------------------------
@ -184,6 +168,6 @@ reset_vector:
; code minimal au reset
jmp 0xF000:reset
builddate db '06/01/2026'
times 16-($-$$) db 0 ; le stub tient dans 16 octets (ou moins)
times 16-($-$$) db 0 ; le stub tient dans 16 octets (ou moins)