Mouse interrupt handler + debug
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Frater
parent
c97c844329
commit
4cf1a0b7a2
6 changed files with 389 additions and 235 deletions
105
src/common/debug_cga.asm
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105
src/common/debug_cga.asm
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; =============================================================================
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; Project : Custom BIOS / ROM
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; File : cga_debug.asm
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; Author : frater
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;
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; License : GNU General Public License v3.0 or later (GPL-3.0+)
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;
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; =============================================================================
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; =============================================================================
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; Fonction : dump_ram_words
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; Description : Lit des mots (16 bits) depuis DS:SI et les affiche en Hexa
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; Entrées :
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; DS:SI = Adresse de départ en RAM
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; CX = Nombre de mots (words) à lire et afficher
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; =============================================================================
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dump_ram_words:
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jcxz .done ; Sécurité : si CX=0, on sort
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.loop:
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lodsw ; Charge [DS:SI] dans AX et incrémente SI de 2
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; Note: x86 est Little Endian. Si RAM = 12 34,
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; AX vaudra 0x3412.
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push cx ; Sauvegarde le compteur de boucle principal
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push si ; Sauvegarde le pointeur (si cga_putc le modifie)
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call print_word_hex ; Affiche AX sous forme "XXXX"
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; (Optionnel) Ajouter un espace entre chaque mot pour la lisibilité
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mov al, ' '
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call cga_putc
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pop si ; Restaure SI
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pop cx ; Restaure CX
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loop .loop ; Décrémente CX et boucle si != 0
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.done:
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ret
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; =============================================================================
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; Fonction : print_word_hex
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; Description : Convertit AX en 4 caractères Hexa et les affiche
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; Entrée : AX = Valeur 16 bits (ex: 0x1A2B)
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; Sortie : Affiche "1A2B" via cga_putc
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; =============================================================================
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print_word_hex:
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push ax ; Sauvegarde AX car on va le modifier (rotation)
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push cx
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push bx
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mov cx, 4 ; 4 caractères hex dans un mot de 16 bits
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.next_digit:
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; On veut afficher les bits 12-15 d'abord.
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; L'astuce est de faire une rotation à gauche de 4 bits.
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; Le quartet de poids fort se retrouve en bas (bits 0-3).
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rol ax, 4
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mov bx, ax ; Copie temporaire
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and bl, 0x0F ; On isole les 4 derniers bits (0 à 15)
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mov al, bl ; AL contient la valeur numérique (0-15)
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call nibble_to_ascii ; Convertit AL en caractère ASCII
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call cga_putc ; Affiche le caractère
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loop .next_digit ; Répète 4 fois
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pop bx
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pop cx
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pop ax ; Restaure l'état original de AX
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ret
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; =============================================================================
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; Fonction : nibble_to_ascii
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; Description : Convertit les 4 bits de poids faible de AL en ASCII Hex
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; Entrée : AL (valeur 0-15)
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; Sortie : AL (caractère '0'-'9' ou 'A'-'F')
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; =============================================================================
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nibble_to_ascii:
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cmp al, 9
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ja .letter ; Si > 9, c'est une lettre (A-F)
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add al, '0' ; Sinon c'est un chiffre : 0x0 -> '0'
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ret
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.letter:
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add al, 'A' - 10 ; Convertit 10 -> 'A', 11 -> 'B', etc.
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ret
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127
src/common/debug_txt.asm
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127
src/common/debug_txt.asm
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@ -0,0 +1,127 @@
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; =============================================================================
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; Project : Custom BIOS / ROM
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; File : debug.asm
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; Author : frater
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; Created : 06 jan 2026
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;
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; License : GNU General Public License v3.0 or later (GPL-3.0+)
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <https://www.gnu.org/licenses/>.
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;
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; =============================================================================
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debug_puts:
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.next:
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push dx
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mov dx, DEBUG_PORT
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lodsb ; AL = *SI++
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test al, al
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jz .done
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out dx, al
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jmp .next
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.done:
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pop dx
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ret
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debug_putc:
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push dx
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mov dx, DEBUG_PORT
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out dx, al
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pop dx
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ret
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; AL = 0..15 -> print hex digit
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debug_puthex4:
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and al, 0Fh
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cmp al, 9
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jbe .num
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add al, 'A' - 10
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jmp .pout
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.num:
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add al, '0'
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.pout:
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call debug_putc
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ret
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; AL = byte -> print 2 hex digits
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debug_puthex8:
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push ax
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mov ah, al
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shr al, 4
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call debug_puthex4
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mov al, ah
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call debug_puthex4
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pop ax
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ret
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; AX = word -> print 4 hex digits
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debug_puthex16:
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push ax
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mov al, ah
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call debug_puthex8
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pop ax
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call debug_puthex8
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ret
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; --- screen text functions ---
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; AH = page
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; DH = row
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; DL = column
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scr_gotoxy:
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mov ah, 02h
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mov bh, 0 ; page 0
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int 10h
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ret
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scr_putc:
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mov ah, 0x0E
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int 10h
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ret
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; AL = 0..15 -> print hex digit
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scr_puthex4:
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and al, 0Fh ; mask 4 bits low
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cmp al, 9 ; is it 0..9 ?
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jbe .num ; yes
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add al, 'A' - 10 ; convert to 'A'..'F'
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jmp .pout
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.num:
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add al, '0' ; convert to '0'..'9'
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.pout:
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mov ah, 0x0E
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int 10h
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ret
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; AL = byte -> print 2 hex digits
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scr_puthex8:
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push ax
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push bx
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mov bl, al ; save al
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shr al, 4 ; 4 bits plus significatifs
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call scr_puthex4
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mov al, bl ; restore al
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call scr_puthex4
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pop bx
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pop ax
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ret
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; AX = word -> print 4 hex digits
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scr_puthex16:
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push ax
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mov al, ah
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call scr_puthex8
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pop ax
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call scr_puthex8
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ret
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