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#ifdef CONFIG_FB

#include <macros.h>

#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_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_OK  0x4f

#define VESA_GET_INFO       0x4f00
#define VESA_GET_MODE_INFO  0x4f01
#define VESA_SET_MODE       0x4f02
#define VESA_SET_PALETTE    0x4f09

.code32
vesa_init:
    jmp $gdtselector(VESA_INIT_DES), $vesa_init_real - vesa_init
    
.code16
vesa_init_real:
    
    mov %cr0, %eax
    and $~1, %eax
    mov %eax, %cr0
    
    jmp $VESA_INIT_SEGMENT, $vesa_init_real2 - vesa_init
    
vesa_init_real2:
    mov $VESA_INIT_SEGMENT, %bx
    
    mov %bx, %es
    mov %bx, %fs
    mov %bx, %gs
    mov %bx, %ds
    mov %bx, %ss
    
    movl %esp, %eax
    movl $0x0000fffc, %esp
    movl $0x0000fffc, %ebp
    pushl %eax
    
    # parse default mode string
    
    mov $default_mode - vesa_init, %di
    xor %eax, %eax
    xor %ebx, %ebx
    
    mov $8, %ecx
    parse_width:
        mov (%di), %al
        
        # check for digit
        
        cmp $'0', %al
        jb parse_width_done
        
        cmp $'9', %al
        ja parse_width_done
        
        sub $'0', %al
        
        # multiply default_width by 10 and add digit
        
        mov default_width - vesa_init, %bx
        lea (%ebx, %ebx, 4), %ebx
        shl $1, %ebx
        add %ax, %bx
        mov %bx, default_width - vesa_init
        
        inc %di
        loop parse_width
    parse_width_done:
    
    mov (%di), %al
    cmp $0, %al
    jz parse_done
    inc %di
    
    mov $8, %ecx
    parse_height:
        mov (%di), %al
        
        # check for digit
        
        cmp $'0', %al
        jb parse_height_done
        
        cmp $'9', %al
        ja parse_height_done
        
        sub $'0', %al
        
        # multiply default_height by 10 and add digit
        
        mov default_height - vesa_init, %bx
        lea (%ebx, %ebx, 4), %ebx
        shl $1, %ebx
        add %ax, %bx
        mov %bx, default_height - vesa_init
        
        inc %di
        loop parse_height
    parse_height_done:
    
    mov (%di), %al
    cmp $0, %al
    jz parse_done
    inc %di
    
    mov $4, %ecx
    parse_bpp:
        mov (%di), %al
        
        # check for digit
        
        cmp $'0', %al
        jb parse_bpp_done
        
        cmp $'9', %al
        ja parse_bpp_done
        
        sub $'0', %al
        
        # multiply default_bpp by 10 and add digit
        
        mov default_bpp - vesa_init, %bx
        lea (%ebx, %ebx, 4), %ebx
        shl $1, %ebx
        add %ax, %bx
        mov %bx, default_bpp - vesa_init
        
        inc %di
        loop parse_bpp
    parse_bpp_done:
    
    parse_done:
    
    mov $VESA_GET_INFO, %ax
    mov $e_vesa_init - vesa_init, %di
    push %di
    int $0x10
    
    pop %di
    cmp $VESA_OK, %al
    jnz no_mode
    
    mov 2 + VESA_MODE_LIST_PTR_OFFSET(%di), %si
    mov %si, %gs
    mov VESA_MODE_LIST_PTR_OFFSET(%di), %si
    
    add $VESA_INFO_SIZE, %di
    
    next_mode:
        # try next mode
        mov %gs:(%si), %cx
        cmp $VESA_END_OF_MODES, %cx
        je no_mode
        
        inc %si
        inc %si
        push %cx
        push %di
        push %si
        mov $VESA_GET_MODE_INFO, %ax
        int $0x10
        
        pop %si
        pop %di
        pop %cx
        cmp $VESA_OK, %al
        jne no_mode
        
        # check for proper attributes (supported, color, graphics, liner 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
        jne next_mode
        
        mov default_height - vesa_init, %ax
        cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
        jne next_mode
        
        # check for proper bpp
        
        mov default_bpp - vesa_init, %al
        cmp VESA_MODE_BPP_OFFSET(%di), %al
        je set_mode
        
        mov $24, %al
        cmp default_bpp - vesa_init, %al
        jne next_mode
        
        # for 24 bpp modes accept also 32 bit bpp
        
        mov $32, %al
        cmp VESA_MODE_BPP_OFFSET(%di), %al
        jne next_mode
    
    set_mode:
        mov %cx, %bx
        or $0xc000, %bx
        push %di
        mov $VESA_SET_MODE, %ax
        int $0x10
        
        pop %di
        cmp $VESA_OK, %al
        jnz no_mode
        
        # set 3:2:3 VGA palette
        
        mov VESA_MODE_BPP_OFFSET(%di), %al
        cmp $8, %al
        jnz vga_not_set
        
        mov VESA_MODE_ATTRIBUTES_OFFSET(%di), %ax
        push %di
        mov $vga323 - vesa_init, %di
        mov $0x100, %ecx
        
        bt $5, %ax              # test if VGA compatible registers are present
        jnc vga_compat
        
            # try VESA routine to set palette
            mov $VESA_SET_PALETTE, %ax
            xor %bl, %bl
            xor %dx, %dx
            int $0x10
            
            cmp $0x00, %ah
            je vga_not_compat
        
        vga_compat:
            # try VGA registers to set palette
            movw $0x3c6, %dx    # set palette mask
            movb $0xff, %al
            outb %al, %dx
            
            movw $0x3c8, %dx    # first index to set
            xor %al, %al
            outb %al, %dx
            
            movw $0x3c9, %dx    # data port
            
            vga_loop:
                movb %es:2(%di), %al
                outb %al, %dx
                
                movb %es:1(%di), %al
                outb %al, %dx
                
                movb %es:(%di), %al
                outb %al, %dx
                
                addw $4, %di
            loop vga_loop
        
        vga_not_compat:
        
            pop %di
        
        vga_not_set:
        
        # 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_SCANLINE_OFFSET(%di), %ax
        
        mov VESA_MODE_WIDTH_OFFSET(%di), %bx
        shl $16, %ebx
        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, %ecx
            or $1, %ecx
            mov %ecx, %cr0
            
            jmp vesa_leave_real2
            
        vesa_leave_real2:
        
            ljmpl $gdtselector(KTEXT32_DES), $(vesa_init_protected - vesa_init + VESA_INIT_SEGMENT << 4)
    
    no_mode:
        # no prefered mode found
        mov $0x111, %cx
        push %di
        push %cx
        mov $VESA_GET_MODE_INFO, %ax
        int $0x10
        
        pop %cx
        pop %di
        cmp $VESA_OK, %al
        jnz text_mode
        jz set_mode             # force relative jump
    
    text_mode:
        # reset to EGA text mode (because of problems with VESA)
        mov $0x0003, %ax
        int $0x10
        mov $0xffffffff, %edi
        xor %ax, %ax
        jz vesa_leave_real      # force relative jump

vga323:
#include "vga323.pal"

default_width:
    .word 0

default_height:
    .word 0

default_bpp:
    .byte 0

default_mode:
    .ascii STRING(CONFIG_VESA_MODE)
    .ascii "-"
    .asciz STRING(CONFIG_VESA_BPP)
    .fill 24

#include "vesa_ret.inc"

.align 4
e_vesa_init:
#endif