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vga.asm
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;
; This file contains the VGA mode 0x13 setup and color palette
;
[bits 32]
global init_vga
global palette
section .text
; void init_vga()
; Initialize VGA mode (0x13)
init_vga:
pushad
; Set mode
mov esi, mode0x13
call set_regs
; Set up palette
mov esi, palette
call set_palette
; Clear screen
mov edi, 0xa0000
mov ax, 0x0000
mov ecx, 0x20000
rep stosw
popad
ret
; Set VGA mode
set_regs:
cli
mov dx, 0x3C2
lodsb
out dx, al
mov dx, 0x3DA
lodsb
out dx, al
xor ecx, ecx
mov dx, 0x3C4
.l1:
lodsb
xchg al, ah
mov al, cl
out dx, ax
inc ecx
cmp cl, 4
jbe .l1
mov dx, 0x3D4
mov ax, 0x0E11
out dx, ax
xor ecx, ecx
mov dx, 0x3D4
.l2:
lodsb
xchg al, ah
mov al, cl
out dx, ax
inc ecx
cmp cl, 0x18
jbe .l2
xor ecx, ecx
mov dx, 0x3cE
.l3:
lodsb
xchg al, ah
mov al, cl
out dx, ax
inc ecx
cmp cl, 8
jbe .l3
mov dx, 0x3DA
in al, dx
xor ecx, ecx
mov dx, 0x3C0
.l4:
in ax, dx
mov al, cl
out dx, al
lodsb
out dx, al
inc ecx
cmp cl, 0x14
jbe .l4
mov al, 0x20
out dx, al
sti
ret
; void set_palette()
; Set palette colors
set_palette:
push ax
push cx
push dx
xor cx, cx
.next_color:
mov dx, 0x03C8
mov al, cl
out dx, al
inc dx
mov al, byte [esi]
out dx, al
inc esi
mov al, byte [esi]
out dx, al
inc esi
mov al, byte [esi]
out dx, al
inc esi
inc cx
cmp cx, 256
jl .next_color
pop dx
pop cx
pop ax
ret
section .data
; 256 color RGB palette (6 bits per channel)
palette db 00, 00, 00, 15, 15, 15, 31, 31, 31, 47, 47, 47, 63, 63, 63
db 15, 00, 00, 31, 00, 00, 47, 00, 00, 63, 00, 00, 00, 00, 00
db 00, 15, 00, 00, 31, 00, 00, 47, 00, 00, 63, 00, 00, 00, 00
db 00, 00, 15, 00, 00, 31, 00, 00, 47, 00, 00, 63, 00, 00, 00
db 15, 15, 00, 31, 31, 00, 47, 47, 00, 63, 63, 00, 00, 00, 00
db 15, 00, 15, 31, 00, 31, 47, 00, 47, 63, 00, 63, 00, 00, 00
db 00, 15, 15, 00, 31, 31, 00, 47, 47, 00, 63, 63, 00, 00, 00
db 15, 07, 00, 31, 15, 00, 47, 23, 00, 63, 31, 00, 00, 00, 00
db 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00
db 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00
db 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00
db 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00
db 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00
db 00, 63, 00, 02, 63, 00, 04, 63, 00, 06, 63, 00, 08, 63, 00
db 10, 63, 00, 12, 63, 00, 14, 63, 00, 16, 63, 00, 18, 63, 00
db 20, 63, 00, 22, 63, 00, 24, 63, 00, 26, 63, 00, 28, 63, 00
db 30, 63, 00, 32, 63, 00, 34, 63, 00, 36, 63, 00, 38, 63, 00
db 40, 63, 00, 42, 63, 00, 44, 63, 00, 46, 63, 00, 48, 63, 00
db 50, 63, 00, 52, 63, 00, 54, 63, 00, 56, 63, 00, 58, 63, 00
db 60, 63, 00, 62, 63, 00, 63, 63, 00, 63, 61, 00, 63, 59, 00
db 63, 57, 00, 63, 55, 00, 63, 53, 00, 63, 51, 00, 63, 49, 00
db 63, 47, 00, 63, 45, 00, 63, 43, 00, 63, 41, 00, 63, 39, 00
db 63, 37, 00, 63, 35, 00, 63, 33, 00, 63, 31, 00, 63, 29, 00
db 63, 27, 00, 63, 25, 00, 63, 23, 00, 63, 21, 00, 63, 19, 00
db 63, 17, 00, 63, 15, 00, 63, 13, 00, 63, 11, 00, 63, 09, 00
db 63, 07, 00, 63, 05, 00, 63, 03, 00, 63, 01, 00, 63, 00, 00
db 63, 00, 02, 63, 00, 04, 63, 00, 06, 63, 00, 08, 63, 00, 10
db 63, 00, 12, 63, 00, 14, 63, 00, 16, 63, 00, 18, 63, 00, 20
db 63, 00, 22, 63, 00, 24, 63, 00, 26, 63, 00, 28, 63, 00, 30
db 63, 00, 32, 63, 00, 34, 63, 00, 36, 63, 00, 38, 63, 00, 40
db 63, 00, 42, 63, 00, 44, 63, 00, 46, 63, 00, 48, 63, 00, 50
db 63, 00, 52, 63, 00, 54, 63, 00, 56, 63, 00, 58, 63, 00, 60
db 63, 00, 62, 63, 00, 63, 61, 00, 63, 59, 00, 63, 57, 00, 63
db 55, 00, 63, 53, 00, 63, 51, 00, 63, 49, 00, 63, 47, 00, 63
db 45, 00, 63, 43, 00, 63, 41, 00, 63, 39, 00, 63, 37, 00, 63
db 35, 00, 63, 33, 00, 63, 31, 00, 63, 29, 00, 63, 27, 00, 63
db 25, 00, 63, 23, 00, 63, 21, 00, 63, 19, 00, 63, 17, 00, 63
db 15, 00, 63, 13, 00, 63, 11, 00, 63, 09, 00, 63, 07, 00, 63
db 05, 00, 63, 03, 00, 63, 01, 00, 63, 00, 00, 63, 00, 02, 63
db 00, 04, 63, 00, 06, 63, 00, 08, 63, 00, 10, 63, 00, 12, 63
db 00, 14, 63, 00, 16, 63, 00, 18, 63, 00, 20, 63, 00, 22, 63
db 00, 24, 63, 00, 26, 63, 00, 28, 63, 00, 30, 63, 00, 32, 63
db 00, 34, 63, 00, 36, 63, 00, 38, 63, 00, 40, 63, 00, 42, 63
db 00, 44, 63, 00, 46, 63, 00, 48, 63, 00, 50, 63, 00, 52, 63
db 00, 54, 63, 00, 56, 63, 00, 58, 63, 00, 60, 63, 00, 62, 63
db 00, 63, 63, 00, 63, 61, 00, 63, 59, 00, 63, 57, 00, 63, 55
db 00, 63, 53, 00, 63, 51, 00, 63, 49, 00, 63, 47, 00, 63, 45
db 00, 63, 43, 00, 63, 41, 00, 63, 39, 00, 63, 37, 00, 63, 35
db 00, 63, 33, 00, 63, 31, 00, 63, 29, 00, 63, 27, 00, 63, 25
db 00, 63, 23, 00, 63, 21, 00, 63, 19, 00, 63, 17, 00, 63, 15
db 00, 63, 13, 00, 63, 11, 00, 63, 09, 00, 63, 07, 00, 63, 05
db 00, 63, 03, 00, 63, 01
; VGA mode 0x13 register values
mode0x13 db 0x63, 0x00, 0x03, 0x01, 0x0F, 0x00, 0x0E, 0x5F, 0x4F
db 0x50, 0x82, 0x54, 0x80, 0xBF, 0x1F, 0x00, 0x41, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x9C, 0x0E, 0x8F, 0x28
db 0x40, 0x96, 0xB9, 0xA3, 0xFF, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x40, 0x05, 0x0F, 0xFF, 0x00, 0x01, 0x02, 0x03
db 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C
db 0x0D, 0x0E, 0x0F, 0x41, 0x00, 0x0F, 0x00, 0x00