| 4,22 → 4,28 |
|---|
| |
| #define VESA_INFO_SIZE 1024 |
| |
| #define VESA_MODE_ATTRIBUTES_OFFSET 0 |
| #define VESA_MODE_LIST_PTR_OFFSET 14 |
| #define VESA_MODE_SCANLINE_OFFSET 16 |
| #define VESA_MODE_WIDTH_OFFSET 18 |
| #define VESA_MODE_HEIGHT_OFFSET 20 |
| #define VESA_MODE_BPP_OFFSET 25 |
| #define VESA_MODE_PHADDR_OFFSET 40 |
| #define VESA_MODE_ATTRIBUTES_OFFSET 0 |
| #define VESA_MODE_LIST_PTR_OFFSET 14 |
| #define VESA_MODE_SCANLINE_OFFSET 16 |
| #define VESA_MODE_WIDTH_OFFSET 18 |
| #define VESA_MODE_HEIGHT_OFFSET 20 |
| #define VESA_MODE_BPP_OFFSET 25 |
| #define VESA_MODE_RED_MASK_OFFSET 31 |
| #define VESA_MODE_RED_POS_OFFSET 32 |
| #define VESA_MODE_GREEN_MASK_OFFSET 33 |
| #define VESA_MODE_GREEN_POS_OFFSET 34 |
| #define VESA_MODE_BLUE_MASK_OFFSET 35 |
| #define VESA_MODE_BLUE_POS_OFFSET 36 |
| #define VESA_MODE_PHADDR_OFFSET 40 |
| |
| #define VESA_END_OF_MODES 0xffff |
| #define VESA_END_OF_MODES 0xffff |
| |
| #define VESA_OK 0x4f |
| #define VESA_OK 0x4f |
| |
| #define VESA_GET_INFO 0x4f00 |
| #define VESA_GET_MODE_INFO 0x4f01 |
| #define VESA_SET_MODE 0x4f02 |
| #define VESA_SET_PALETTE 0x4f09 |
| #define VESA_GET_INFO 0x4f00 |
| #define VESA_GET_MODE_INFO 0x4f01 |
| #define VESA_SET_MODE 0x4f02 |
| #define VESA_SET_PALETTE 0x4f09 |
| |
| .code32 |
| vesa_init: |
| 163,7 → 169,7 |
|---|
| # try next mode |
| mov %gs:(%si), %cx |
| cmp $VESA_END_OF_MODES, %cx |
| jz no_mode |
| je no_mode |
| |
| inc %si |
| inc %si |
| 177,29 → 183,40 |
|---|
| pop %di |
| pop %cx |
| cmp $VESA_OK, %al |
| jnz no_mode |
| jne no_mode |
| |
| # check for proper attributes (supported, color, graphics, linear framebuffer) |
| |
| mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax |
| and $0x99, %ax |
| cmp $0x99, %ax |
| jne next_mode |
| |
| # check for proper resolution |
| |
| mov default_width - vesa_init, %ax |
| cmp VESA_MODE_WIDTH_OFFSET(%di), %ax |
| jnz next_mode |
| jne next_mode |
| |
| mov default_height - vesa_init, %ax |
| cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax |
| jnz next_mode |
| jne next_mode |
| |
| # check for proper bpp |
| |
| mov default_bpp - vesa_init, %al |
| cmp VESA_MODE_BPP_OFFSET(%di), %al |
| jz set_mode |
| je set_mode |
| |
| mov $24, %al |
| cmp default_bpp - vesa_init, %al |
| jnz next_mode |
| jne next_mode |
| |
| # for 24 bpp modes accept also 32 bit bpp |
| |
| mov $32, %al |
| cmp VESA_MODE_BPP_OFFSET(%di), %al |
| jnz next_mode |
| jne next_mode |
| |
| set_mode: |
| mov %cx, %bx |
| 266,21 → 283,42 |
|---|
| |
| vga_not_set: |
| |
| mov VESA_MODE_PHADDR_OFFSET(%di), %esi |
| mov VESA_MODE_WIDTH_OFFSET(%di), %ax |
| # store mode parameters |
| # eax = bpp[8] scanline[16] |
| # ebx = width[16] height[16] |
| # edx = red_mask[8] red_pos[8] green_mask[8] green_pos[8] |
| # esi = blue_mask[8] blue_pos[8] |
| # edi = linear frame buffer |
| |
| mov VESA_MODE_BPP_OFFSET(%di), %al |
| xor %ah, %ah |
| shl $16, %eax |
| mov VESA_MODE_HEIGHT_OFFSET(%di), %ax |
| mov VESA_MODE_BPP_OFFSET(%di), %bl |
| xor %bh, %bh |
| mov VESA_MODE_SCANLINE_OFFSET(%di), %ax |
| |
| mov VESA_MODE_WIDTH_OFFSET(%di), %bx |
| shl $16, %ebx |
| mov VESA_MODE_SCANLINE_OFFSET(%di), %bx |
| mov %eax, %edi |
| mov VESA_MODE_HEIGHT_OFFSET(%di), %bx |
| |
| mov VESA_MODE_BLUE_MASK_OFFSET(%di), %dl |
| shl $8, %edx |
| mov VESA_MODE_BLUE_POS_OFFSET(%di), %dl |
| mov %edx, %esi |
| |
| mov VESA_MODE_RED_MASK_OFFSET(%di), %dl |
| shl $8, %edx |
| mov VESA_MODE_RED_POS_OFFSET(%di), %dl |
| shl $8, %edx |
| mov VESA_MODE_GREEN_MASK_OFFSET(%di), %dl |
| shl $8, %edx |
| mov VESA_MODE_GREEN_POS_OFFSET(%di), %dl |
| |
| mov VESA_MODE_PHADDR_OFFSET(%di), %edi |
| |
| vesa_leave_real: |
| |
| mov %cr0, %eax |
| or $1, %eax |
| mov %eax, %cr0 |
| mov %cr0, %ecx |
| or $1, %ecx |
| mov %ecx, %cr0 |
| |
| jmp vesa_leave_real2 |
| |