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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_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
jz 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
jnz no_mode
mov default_width - vesa_init, %ax
cmp VESA_MODE_WIDTH_OFFSET(%di), %ax
jnz next_mode
mov default_height - vesa_init, %ax
cmp VESA_MODE_HEIGHT_OFFSET(%di), %ax
jnz next_mode
mov default_bpp - vesa_init, %al
cmp VESA_MODE_BPP_OFFSET(%di), %al
jz set_mode
mov $24, %al
cmp default_bpp - vesa_init, %al
jnz next_mode
# for 24 bpp modes accept also 32 bit bpp
mov $32, %al
cmp VESA_MODE_BPP_OFFSET(%di), %al
jnz 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:
mov VESA_MODE_PHADDR_OFFSET(%di), %esi
mov VESA_MODE_WIDTH_OFFSET(%di), %ax
shl $16, %eax
mov VESA_MODE_HEIGHT_OFFSET(%di), %ax
mov VESA_MODE_BPP_OFFSET(%di), %bl
xor %bh, %bh
shl $16, %ebx
mov VESA_MODE_SCANLINE_OFFSET(%di), %bx
mov %eax, %edi
vesa_leave_real:
mov %cr0, %eax
or $1, %eax
mov %eax, %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