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#include <macros.h>
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#include <macros.h>
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#define VESA_INFO_SIZE 1024
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#define VESA_INFO_SIZE 1024
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#define VESA_MODE_ATTRIBUTES_OFFSET 0
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#define VESA_MODE_ATTRIBUTES_OFFSET  0
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#define VESA_MODE_LIST_PTR_OFFSET 14
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#define VESA_MODE_LIST_PTR_OFFSET    14
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#define VESA_MODE_SCANLINE_OFFSET 16
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#define VESA_MODE_SCANLINE_OFFSET    16
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#define VESA_MODE_WIDTH_OFFSET 18
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#define VESA_MODE_WIDTH_OFFSET       18
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#define VESA_MODE_HEIGHT_OFFSET 20
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#define VESA_MODE_HEIGHT_OFFSET      20
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#define VESA_MODE_BPP_OFFSET 25
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#define VESA_MODE_BPP_OFFSET         25
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#define VESA_MODE_RED_MASK_OFFSET    31
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#define VESA_MODE_RED_POS_OFFSET     32
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#define VESA_MODE_GREEN_MASK_OFFSET  33
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#define VESA_MODE_GREEN_POS_OFFSET   34
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#define VESA_MODE_BLUE_MASK_OFFSET   35
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#define VESA_MODE_BLUE_POS_OFFSET    36
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#define VESA_MODE_PHADDR_OFFSET 40
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#define VESA_MODE_PHADDR_OFFSET      40
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#define VESA_END_OF_MODES 0xffff
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#define VESA_END_OF_MODES  0xffff
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#define VESA_OK 0x4f
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#define VESA_OK  0x4f
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#define VESA_GET_INFO 0x4f00
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#define VESA_GET_INFO       0x4f00
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#define VESA_GET_MODE_INFO 0x4f01
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#define VESA_GET_MODE_INFO  0x4f01
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#define VESA_SET_MODE 0x4f02
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#define VESA_SET_MODE       0x4f02
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#define VESA_SET_PALETTE 0x4f09
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#define VESA_SET_PALETTE    0x4f09
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.code32
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.code32
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vesa_init:
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vesa_init:
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	jmp $gdtselector(VESA_INIT_DES), $vesa_init_real - vesa_init
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	jmp $gdtselector(VESA_INIT_DES), $vesa_init_real - vesa_init
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	next_mode:
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	next_mode:
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		# try next mode
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		# try next mode
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		mov %gs:(%si), %cx
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		mov %gs:(%si), %cx
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		cmp $VESA_END_OF_MODES, %cx
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		cmp $VESA_END_OF_MODES, %cx
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		jz no_mode
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		je no_mode
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		inc %si
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		inc %si
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		inc %si
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		inc %si
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		push %cx
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		push %cx
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		push %di
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		push %di
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		pop %si
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		pop %si
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		pop %di
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		pop %di
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		pop %cx
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		pop %cx
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		cmp $VESA_OK, %al
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		cmp $VESA_OK, %al
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		jnz no_mode
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		jne 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
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		and $0x99, %ax
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		cmp $0x99, %ax
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		jne next_mode
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		# check for proper resolution
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		mov default_width - vesa_init, %ax
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		mov default_width - vesa_init, %ax
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		cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
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		cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
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		jnz next_mode
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		jne next_mode
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		mov default_height - vesa_init, %ax
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		mov default_height - vesa_init, %ax
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		cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
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		cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
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		jnz next_mode
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		jne next_mode
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		# check for proper bpp
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		mov default_bpp - vesa_init, %al
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		mov default_bpp - vesa_init, %al
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		cmp VESA_MODE_BPP_OFFSET(%di), %al
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		cmp VESA_MODE_BPP_OFFSET(%di), %al
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		jz set_mode
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		je set_mode
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		mov $24, %al
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		mov $24, %al
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		cmp default_bpp - vesa_init, %al
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		cmp default_bpp - vesa_init, %al
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		jnz next_mode
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		jne next_mode
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		# for 24 bpp modes accept also 32 bit bpp
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		# for 24 bpp modes accept also 32 bit bpp
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		mov $32, %al
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		mov $32, %al
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		cmp VESA_MODE_BPP_OFFSET(%di), %al
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		cmp VESA_MODE_BPP_OFFSET(%di), %al
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		jnz next_mode
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		jne next_mode
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	set_mode:
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	set_mode:
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		mov %cx, %bx
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		mov %cx, %bx
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		or $0xc000, %bx
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		or $0xc000, %bx
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		push %di
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		push %di
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			pop %di
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			pop %di
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		vga_not_set:
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		vga_not_set:
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		# store mode parameters
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		#  eax = bpp[8] scanline[16]
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		#  ebx = width[16]  height[16]
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		#  edx = red_mask[8] red_pos[8] green_mask[8] green_pos[8]
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		mov VESA_MODE_PHADDR_OFFSET(%di), %esi
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		#  esi = blue_mask[8] blue_pos[8]
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		#  edi = linear frame buffer
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		mov VESA_MODE_WIDTH_OFFSET(%di), %ax
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		mov VESA_MODE_BPP_OFFSET(%di), %al
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		xor %ah, %ah
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		shl $16, %eax
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		shl $16, %eax
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		mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
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		mov VESA_MODE_SCANLINE_OFFSET(%di), %ax
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		mov VESA_MODE_BPP_OFFSET(%di), %bl
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		mov VESA_MODE_WIDTH_OFFSET(%di), %bx
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		xor %bh, %bh
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		shl $16, %ebx
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		shl $16, %ebx
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		mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
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		mov VESA_MODE_HEIGHT_OFFSET(%di), %bx
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		mov VESA_MODE_BLUE_MASK_OFFSET(%di), %dl
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		shl $8, %edx
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		mov VESA_MODE_BLUE_POS_OFFSET(%di), %dl
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		mov %eax, %edi
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		mov %edx, %esi
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		mov VESA_MODE_RED_MASK_OFFSET(%di), %dl
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		shl $8, %edx
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		mov VESA_MODE_RED_POS_OFFSET(%di), %dl
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		shl $8, %edx
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		mov VESA_MODE_GREEN_MASK_OFFSET(%di), %dl
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		shl $8, %edx
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		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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		vesa_leave_real:
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			mov %cr0, %eax
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			mov %cr0, %ecx
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			or $1, %eax
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			or $1, %ecx
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			mov %eax, %cr0
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			mov %ecx, %cr0
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			jmp vesa_leave_real2
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			jmp vesa_leave_real2
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		vesa_leave_real2:
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		vesa_leave_real2:
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