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add mouse support (WIP)

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Frater 2026-01-10 17:25:59 +01:00
commit 91881695fb
10 changed files with 719 additions and 161 deletions
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39
src/bda.asm
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@ -2,7 +2,6 @@
; Project : Custom BIOS / ROM
; File : bda.asm
; Author : frater
; Created : 06 jan 2026
;
; License : GNU General Public License v3.0 or later (GPL-3.0+)
;
@ -21,32 +20,31 @@
;
; =============================================================================
;
; compatible with IBM PC BIOS Data Area (BDA):
; https://wiki.nox-rhea.org/back2root/ibm-pc-ms-dos/hardware/informations/bios_data_area
;
%define BDA_SEGMENT 0x0040 ; segment BDA
; custom var
; custom vars
%define BDA_INFO_MEM_SIZE 0x0014 ; Memory size in Kbytes
%define BDA_INFO_MEM_SEG BDA_INFO_MEM_SIZE+2 ; highest Memory Segment
; video related information (compatible with VGA bios)
%define BDA_VIDEO_CURR_MODE 0x0049
%define BDA_VIDEO_COLUMNS 0x004A
%define BDA_VIDEO_COLUMNS 0x004A
%define BDA_VIDEO_BUF_SIZE 0x004C
%define BDA_VIDEO_OFS_PAGE 0x004E
; 40:50 8 words Cursor position of pages 1-8, high order byte=row low order byte=column; changing this data isn't reflected immediately on the display
; 40:60 byte Cursor ending (bottom) scan line (don't modify)
; 40:61 byte Cursor starting (top) scan line (don't modify)
; 40:62 byte Active display page number
; 40:63 word Base port address for active 6845 CRT controller 3B4h = mono, 3D4h = color
; 40:65 byte 6845 CRT mode control register value (port 3x8h) ; EGA/VGA values emulate those of the MDA/CGA
; 40:66 byte CGA current color palette mask setting (port 3d9h) ; EGA and VGA values emulate the CGA
; 40:50 8 words Cursor position of pages 1-8, high order byte=row low order byte=column;
; changing this data isn't reflected immediately on the display
; 40:60 byte Cursor ending (bottom) scan line (don't modify)
; 40:61 byte Cursor starting (top) scan line (don't modify)
; 40:62 byte Active display page number
; 40:63 word Base port address for active 6845 CRT controller 3B4h = mono, 3D4h = color
; 40:65 byte 6845 CRT mode control register value (port 3x8h) ; EGA/VGA values emulate those of the MDA/CGA
; 40:66 byte CGA current color palette mask setting (port 3d9h) ; EGA and VGA values emulate the CGA
;
; information relative à la souris
@ -57,7 +55,18 @@
%define BDA_MOUSE_BUFFER 0x0000 ; dword; buffer (jusqu'à 4 octets)
%define BDA_MOUSE_IDX 0x0004 ; byte 0..3
%define DBA_MOUSE_PACKETLEN 0x0005
; 0x0006
%define DBA_CURSOR_MASK 0x0006 ; byte pixels mask (bit per pixel)
%define BDA_MOUSE_STATUS 0x0007 ; byte
%define BDA_MOUSE_X 0x0008 ; word
%define BDA_MOUSE_Y 0x000A ; word
%define BDA_MOUSE_Y 0x000A ; word
%define BDA_MOUSE_WHEEL 0x000C ; word
%define BDA_CURSOR_VISIBLE 0x000E ; byte (0/1)
%define BDA_CURSOR_OLDX 0x000F ; word
%define BDA_CURSOR_OLDY 0x0011 ; word
%define BDA_CURSOR_NEWX 0x0013 ; word
%define BDA_CURSOR_NEWY 0x0015 ; word
%define BDA_CURSOR_BITOFF 0x0017 ; byte 0..7 bits d'offset (x&7)
%define BDA_CURSOR_BYTES 0x0019 ; byte 2 ou 3 bytes as source for cursor image
%define BDA_CURSOR_SAVED 0x001A ; flag if image saved
%define BDA_CURSOR_BG 0x001B ; 48 bytes max (3*16)