4,28 → 4,22 |
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#define VESA_INFO_SIZE 1024 |
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#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_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 |
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#define VESA_END_OF_MODES 0xffff |
#define VESA_END_OF_MODES 0xffff |
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#define VESA_OK 0x4f |
#define VESA_OK 0x4f |
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#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 |
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.code32 |
vesa_init: |
169,7 → 163,7 |
# try next mode |
mov %gs:(%si), %cx |
cmp $VESA_END_OF_MODES, %cx |
je no_mode |
jz no_mode |
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inc %si |
inc %si |
183,40 → 177,29 |
pop %di |
pop %cx |
cmp $VESA_OK, %al |
jne no_mode |
jnz no_mode |
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# check for proper attributes (supported, color, graphics, linear framebuffer) |
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mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax |
and $0x99, %ax |
cmp $0x99, %ax |
jne next_mode |
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# check for proper resolution |
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mov default_width - vesa_init, %ax |
cmp VESA_MODE_WIDTH_OFFSET(%di), %ax |
jne next_mode |
jnz next_mode |
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mov default_height - vesa_init, %ax |
cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax |
jne next_mode |
jnz next_mode |
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# check for proper bpp |
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mov default_bpp - vesa_init, %al |
cmp VESA_MODE_BPP_OFFSET(%di), %al |
je set_mode |
jz set_mode |
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mov $24, %al |
cmp default_bpp - vesa_init, %al |
jne next_mode |
jnz next_mode |
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# for 24 bpp modes accept also 32 bit bpp |
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mov $32, %al |
cmp VESA_MODE_BPP_OFFSET(%di), %al |
jne next_mode |
jnz next_mode |
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set_mode: |
mov %cx, %bx |
283,42 → 266,21 |
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vga_not_set: |
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# 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 |
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mov VESA_MODE_BPP_OFFSET(%di), %al |
xor %ah, %ah |
mov VESA_MODE_PHADDR_OFFSET(%di), %esi |
mov VESA_MODE_WIDTH_OFFSET(%di), %ax |
shl $16, %eax |
mov VESA_MODE_SCANLINE_OFFSET(%di), %ax |
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mov VESA_MODE_WIDTH_OFFSET(%di), %bx |
mov VESA_MODE_HEIGHT_OFFSET(%di), %ax |
mov VESA_MODE_BPP_OFFSET(%di), %bl |
xor %bh, %bh |
shl $16, %ebx |
mov VESA_MODE_HEIGHT_OFFSET(%di), %bx |
mov VESA_MODE_SCANLINE_OFFSET(%di), %bx |
mov %eax, %edi |
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mov VESA_MODE_BLUE_MASK_OFFSET(%di), %dl |
shl $8, %edx |
mov VESA_MODE_BLUE_POS_OFFSET(%di), %dl |
mov %edx, %esi |
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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 |
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mov VESA_MODE_PHADDR_OFFSET(%di), %edi |
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vesa_leave_real: |
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mov %cr0, %ecx |
or $1, %ecx |
mov %ecx, %cr0 |
mov %cr0, %eax |
or $1, %eax |
mov %eax, %cr0 |
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jmp vesa_leave_real2 |
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