diff options
Diffstat (limited to 'src/kernel/graphics/vesa.asm')
| -rw-r--r-- | src/kernel/graphics/vesa.asm | 245 |
1 files changed, 120 insertions, 125 deletions
diff --git a/src/kernel/graphics/vesa.asm b/src/kernel/graphics/vesa.asm index 9d8e231..3fdd4cd 100644 --- a/src/kernel/graphics/vesa.asm +++ b/src/kernel/graphics/vesa.asm @@ -1,72 +1,3 @@ -global find_mode -global best_video_mode - -vbe_info_block: - .signature db "VBE2" ; indicate support for VBE 2.0+ - .version dw 0 - .oem dd 0 - .capabilities dd 0 - .video_modes dd 0 - .video_memory dw 0 - .software_rev dw 0 - .vendor dd 0 - .product_name dd 0 - .product_rev dd 0 - .reserved times 222 db 0 - .oem_data times 256 db 0 - -mode_info_block: - .attributes dw 0 - .window_a db 0 - .window_b db 0 - .granularity dw 0 - .window_size dw 0 - .segment_a dw 0 - .segment_b dw 0 - .win_func_ptr dd 0 - .pitch dw 0 - .width dw 0 - .height dw 0 - .w_char db 0 - .y_char db 0 - .planes db 0 - .bpp db 0 - .banks db 0 - .memory_model db 0 - .bank_size db 0 - .image_pages db 0 - .reserved0 db 0 - - .red_mask db 0 - .red_position db 0 - .green_mask db 0 - .green_position db 0 - .blue_mask db 0 - .blue_position db 0 - .reserved_mask db 0 - .reserved_position db 0 - .direct_color_attributes db 0 - - .framebuffer dd 0 - .off_screen_mem_off dd 0 - .off_screen_mem_size dw 0 - .reserved1 times 206 db 0 - -best_video_mode: - .bpp db 0 - .height dw 0 - .width dw 0 - .mode dw 0 - .framebuffer dd 0 - .bytes_per_line dw 0 - .bytes_per_pixel dd 0 - .x_cur_max dw 0 - .y_cur_max dw 0 - -segments dw 0 -offset dw 0 -mode dw 0 - width equ 1024 height equ 768 bpp equ 32 @@ -91,6 +22,7 @@ search_video_mode: mov cx, 1 push cx + ret find_mode: mov dx, [fs:si] @@ -115,62 +47,59 @@ find_mode: inc cx push cx - check_mode: - mov cx, 0 - mov bx, [best_video_mode.width] - cmp bx, [mode_info_block.width] - jl save_and_continue - je compare_height - jmp next_mode - - compare_height: - mov bx, [best_video_mode.height] - cmp bx, [mode_info_block.height] - jl save_and_continue - je compare_bpp - jmp next_mode - - compare_bpp: - mov dx, [best_video_mode.bpp] - mov ax, [mode_info_block.bpp] - and ax, 11111111b - cmp dx, ax - jl save_and_continue - jmp next_mode - - save_and_continue: - mov bx, [mode_info_block.width] - mov [best_video_mode.width], bx - - shr bx,3 - dec bx - mov [best_video_mode.x_cur_max], bx - - mov bx, [mode_info_block.height] - mov [best_video_mode.height], bx - - shr bx, 4 - dec bx - mov word [best_video_mode.y_cur_max], ax - - mov ebx, 0 - mov bl, [mode_info_block.bpp] - mov byte [best_video_mode.bpp], bl - shr ebx, 3 - mov dword [best_video_mode.bytes_per_pixel], ebx - - - mov bx, [mode] - mov [best_video_mode.mode], bx - mov ebx, [mode_info_block.framebuffer] - mov dword[best_video_mode.framebuffer], ebx - mov bx, [mode_info_block.pitch] - mov word [best_video_mode.bytes_per_line],bx - jmp next_mode - -pop es - -jmp $ +check_mode: + mov cx, 0 + mov bx, [best_video_mode.width] + cmp bx, [mode_info_block.width] + jl save_and_continue + je compare_height + jmp next_mode + +compare_height: + mov bx, [best_video_mode.height] + cmp bx, [mode_info_block.height] + jl save_and_continue + je compare_bpp + jmp next_mode + +compare_bpp: + mov dx, [best_video_mode.bpp] + mov ax, [mode_info_block.bpp] + and ax, 11111111b + cmp dx, ax + jl save_and_continue + jmp next_mode + +save_and_continue: + mov bx, [mode_info_block.width] + mov [best_video_mode.width], bx + + shr bx,3 + dec bx + mov [best_video_mode.x_cur_max], bx + + mov bx, [mode_info_block.height] + mov [best_video_mode.height], bx + + shr bx, 4 + dec bx + mov word [best_video_mode.y_cur_max], ax + + mov ebx, 0 + mov bl, [mode_info_block.bpp] + mov byte [best_video_mode.bpp], bl + shr ebx, 3 + mov dword [best_video_mode.bytes_per_pixel], ebx + + mov bx, [mode] + mov [best_video_mode.mode], bx + mov ebx,[mode_info_block.framebuffer] + mov dword [best_video_mode.framebuffer], ebx + mov bx, [mode_info_block.pitch] + mov word [best_video_mode.bytes_per_line], bx + jmp next_mode + pop es + jmp $ new_line_and_next_mode: mov cx,1 @@ -199,3 +128,69 @@ next_mode: mov fs, ax mov si, [offset] jmp find_mode + +vbe_info_block: + .signature db "VBE2"; indicate support for VBE 2.0+ + .version dw 0 + .oem dd 0 + .capabilities dd 0 + .video_modes dd 0 + .video_memory dw 0 + .software_rev dw 0 + .vendor dd 0 + .product_name dd 0 + .product_rev dd 0 + .reserved times 222 db 0 + .oem_data times 256 db 0 + +mode_info_block: + .attributes dw 0 + .window_a db 0 + .window_b db 0 + .granularity dw 0 + .window_size dw 0 + .segment_a dw 0 + .segment_b dw 0 + .win_func_ptr dd 0 + .pitch dw 0 + .width dw 0 + .height dw 0 + .w_char db 0 + .y_char db 0 + .planes db 0 + .bpp db 0 + .banks db 0 + .memory_model db 0 + .bank_size db 0 + .image_pages db 0 + .reserved0 db 0 + + .red_mask db 0 + .red_position db 0 + .green_mask db 0 + .green_position db 0 + .blue_mask db 0 + .blue_position db 0 + .reserved_mask db 0 + .reserved_position db 0 + .direct_color_attributes db 0 + + .framebuffer dd 0 + .off_screen_mem_off dd 0 + .off_screen_mem_size dw 0 + .reserved1 times 206 db 0 + +best_video_mode: + .bpp db 0 + .height dw 0 + .width dw 0 + .mode dw 0 + .framebuffer dd 0 + .bytes_per_line dw 0 + .bytes_per_pixel dd 0 + .x_cur_max dw 0 + .y_cur_max dw 0 + +segments dw 0 +offset dw 0 +mode dw 0 |