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starting VGA driver

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This commit is contained in:
Frater 2026-02-15 18:31:40 +01:00
commit 0775fe6193
13 changed files with 1528 additions and 682 deletions
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16
src/common/bda.asm
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@ -24,11 +24,9 @@
; https://wiki.nox-rhea.org/back2root/ibm-pc-ms-dos/hardware/informations/bios_data_area
;
%define BDA_SEGMENT 0x0040 ; segment BDA
; 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
%define BDA_SEGMENT 0x0040 ; segment BDA (historically)
%define BDA_CUSTOM_SEG 0x0050 ; custom data (mouse, gfx cursor, etc..)
%define BDA_GUI_WIDGET 0x0070 ; Segment de données UI (Safe: après Stack, avant Heap)
; video related information (compatible with VGA bios)
%define BDA_VIDEO_CURR_MODE 0x0049
@ -38,7 +36,8 @@
;
; information relative à la souris
;
%define BDA_DATA_SEG 0x0050
%define BDA_BitPP 4
%define BKG_DWORDS_PER_LINE 1 ; 1 dword stocké par ligne
%define BKG_LINES 16
@ -63,7 +62,8 @@ struc mouse
.cur_ofs resw 1 ;
.bkg_saved resb 1 ; background saved
alignb 4 ; alignement 4 bytes
.bkg_buffer resd 16 ; buffer for saved background
; buffer for saved background
.bkg_buffer resd 16*BDA_BitPP
endstruc
struc gfx
@ -86,7 +86,7 @@ bda_setup:
pusha
push ds
mov ax, BDA_DATA_SEG
mov ax, BDA_CUSTOM_SEG
mov es, ax
mov ax, 0x5F