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draw ok seulement si x est modulo de 8

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Frater 2026-01-21 20:55:02 +01:00
commit 88d4cb076b
4 changed files with 161 additions and 120 deletions
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126
src/bda.asm
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@ -24,92 +24,94 @@
; https://wiki.nox-rhea.org/back2root/ibm-pc-ms-dos/hardware/informations/bios_data_area
;
%define BDA_SEGMENT 0x0040 ; segment BDA
%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_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_BUF_SIZE 0x004C
%define BDA_VIDEO_OFS_PAGE 0x004E
%define BDA_VIDEO_CURR_MODE 0x0049
%define BDA_VIDEO_COLUMNS 0x004A
%define BDA_VIDEO_BUF_SIZE 0x004C
%define BDA_VIDEO_OFS_PAGE 0x004E
; keyboard related information
%define BDA_KBD_HEAD 0x0080 ; byte
%define BDA_KBD_TAIL 0x0081 ; byte
%define BDA_KBD_FLAGS 0x0082 ; byte: bit0=shift, bit1=ctrl, bit2=alt, bit3=caps, bit4=ext(E0)
%define BDA_KBD_BUF 0x0090 ; buffer circulaire (par ex 32 entrées *2 = 64 bytes)
%define BDA_KBD_HEAD 0x0080 ; byte
%define BDA_KBD_TAIL 0x0081 ; byte
%define BDA_KBD_FLAGS 0x0082 ; byte: bit0=shift, bit1=ctrl, bit2=alt, bit3=caps, bit4=ext(E0)
%define BDA_KBD_BUF 0x0090 ; buffer circulaire (par ex 32 entrées *2 = 64 bytes)
%define KBD_BUF_MASK 0x1F ; 32 entrées => index 0..31
%define KBD_BUF_MASK 0x1F ; 32 entrées => index 0..31
;
; information relative à la souris
;
%define BDA_DATA_SEG 0x0050
%define BDA_MOUSE 0x0000
%define BDA_DATA_SEG 0x0050
%define BDA_MOUSE 0x0000
struc mouse
.buffer resb 4 ; i8042 input buffer
.idx resb 1 ; index in the buffer
.packetlen resb 1 ; max buffer len (3 ou 4)
.buffer resb 4 ; i8042 input buffer
.idx resb 1 ; index in the buffer
.packetlen resb 1 ; max buffer len (3 ou 4)
.status resb 1 ; mouse status (button etc)
.wheel resb 1 ; if a packet size is 4; experimental
.x resw 1 ;
.y resw 1
.status resb 1 ; mouse status (button etc)
.wheel resb 1 ; if a packet size is 4; experimental
.x resw 1 ;
.y resw 1
; cursor management
.cur_x resw 1 ; preservation des x,y du background
.cur_y resw 1
.cur_addr_start resw 1 ; adresse de départ de la sauvegarde
.cur_bank_add resw 1 ; + ou - 0x2000
.cur_visible resb 1
.cur_seg resw 1 ; segment / offset of the pointer
.cur_ofs resw 1
.cur_mask resb 1 ; pixels mask (bit per pixel)
.cur_bit_ofs resb 1 ; 0..7 bits d'offset (x&7)
.bkg_saved resb 1 ; background saved
.bkg_buffer resb 16*3 ; buffer for saved background
.cur_x resw 1 ; preservation des x,y du background
.cur_y resw 1
.cur_addr_start resw 1 ; adresse de départ de la sauvegarde
.cur_bank_add resw 1 ; + ou - 0x2000
.cur_drawing resb 1
.cur_visible resb 1
.cur_seg resw 1 ; segment / offset of the pointer
.cur_ofs resw 1
.cur_mask resb 1 ; pixels mask (bit per pixel)
.cur_bit_ofs resb 1 ; 0..7 bits d'offset (x&7)
.bkg_saved resb 1 ; background saved
.bkg_buffer resb 16*3 ; buffer for saved background
endstruc
%define BDA_TIMER (BDA_MOUSE + mouse_size)
; -----------------------------------------------------------------------------------
; PC components I/O ports
; -----------------------------------------------------------------------------------
; controleur clavier/souris i8042 (AT-PS/2)
%define i8042_PS2_DATA 0x60
%define i8042_PS2_CTRL 0x64
%define i8042_PS2_DATA 0x60
%define i8042_PS2_CTRL 0x64
; PIC 8259 ports (Programmable Interrupt Controller)
; PIC 1 : Master
%define i8259_MASTER_CMD 0x20
%define i8259_MASTER_DATA 0x21
%define i8259_MASTER_CMD 0x20
%define i8259_MASTER_DATA 0x21
; PIC 2 : Slave
%define i8259_SLAVE_CMD 0xA0
%define i8259_SLAVE_DATA 0xA1
%define i8259_SLAVE_CMD 0xA0
%define i8259_SLAVE_DATA 0xA1
; i8259 Commands
%define ICW1_ICW4 0x01 ; Indicates that ICW4 will be present
%define ICW1_SINGLE 0x02 ; Single (cascade) mode
%define ICW1_INTERVAL4 0x04 ; Call address interval 4 (8)
%define ICW1_LEVEL 0x08 ; Level triggered (edge) mode
%define ICW1_INIT 0x10 ; Initialization - required!
%define ICW1_ICW4 0x01 ; Indicates that ICW4 will be present
%define ICW1_SINGLE 0x02 ; Single (cascade) mode
%define ICW1_INTERVAL4 0x04 ; Call address interval 4 (8)
%define ICW1_LEVEL 0x08 ; Level triggered (edge) mode
%define ICW1_INIT 0x10 ; Initialization - required!
%define ICW4_8086 0x01 ; 8086/88 (MCS-80/85) mode
%define ICW4_AUTO 0x02 ; Auto (normal) EOI
%define ICW4_BUF_SLAVE 0x08 ; Buffered mode/slave
%define ICW4_BUF_MASTER 0x0C ; Buffered mode/master
%define ICW4_SFNM 0x10 ; Special fully nested (not)
%define PIC_EOI 0x20
%define ICW4_8086 0x01 ; 8086/88 (MCS-80/85) mode
%define ICW4_AUTO 0x02 ; Auto (normal) EOI
%define ICW4_BUF_SLAVE 0x08 ; Buffered mode/slave
%define ICW4_BUF_MASTER 0x0C ; Buffered mode/master
%define ICW4_SFNM 0x10 ; Special fully nested (not)
%define PIC_EOI 0x20
; Remap : IRQ0..7 -> 0x08..0x0F, IRQ8..15 -> 0x70..0x77
%define i8259_MASTER_INT 0x08
%define i8259_SLAVE_INT 0x70
%define i8259_MASTER_INT 0x08
%define i8259_SLAVE_INT 0x70
%define IRQ_ENABLED 0x00
%define IRQ_DISABLED 0x01
%define IRQ_ENABLED 0x00
%define IRQ_DISABLED 0x01
; -----------------------------------------------------------------------------------
; bda_setup
@ -117,16 +119,16 @@ endstruc
; -----------------------------------------------------------------------------------
bda_setup:
pusha
push ds
push ds
mov ax, BDA_DATA_SEG
mov es, ax
mov ax, BDA_DATA_SEG
mov es, ax
mov ax, 0x5F
mov cx,0xFF
xor di, di
rep stosb ; clear BDA area
mov ax, 0x5F
mov cx,0xFF
xor di, di
rep stosb ; clear BDA area
pop ds
pop ds
popa
ret