The Place to Start for Operating System Developers
http://f.osdev.org/
but if you want to display more clear,VGA maybe seems not enough?Combuster wrote:I'd personally start with a VGA driver, being that if you can work with it, everything else is a bonus. But you could have asked the wiki on the pros and cons of all the alternatives.
I'd personally start with a VGA driver, being that if you can work with it, everything else is a bonus. But you could have asked the wiki on the pros and cons of all the alternatives.
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;************************************
; By Dex
; Assemble with fasm
; c:\fasm Vesa.asm Vesa.bin
;
;************************************
org 0x7C00
use16
;****************************
; Realmode startup code.
;****************************
start:
xor ax,ax
mov ds,ax
mov es,ax
mov ss,ax
mov sp,0x7C00
;****************************
; Vesa start code.
;****************************
mov bx,4112h
mov ax,4f01h
mov di,Mode_Info
mov cx,bx
int 10h
mov ax,4f02h
int 10h
;*****************************
; Setting up, to enter pmode.
;*****************************
cli
lgdt [gdtr]
mov eax, cr0
or al,0x1
mov cr0,eax
jmp 0x10: protected
;*****************************
; Pmode. ;-)
;*****************************
use32
protected:
mov ax,0x8
mov ds,ax
mov es,ax
mov ss,ax
mov esp,0x7C00
;*****************************
; Turn floppy off.
;*****************************
mov dx,3F2h
mov al,0
out dx,al
;*****************************
; Do we have 32 BitsPerPixel.
;*****************************
cmp byte[ModeInfo_BitsPerPixel],32
jne Letsloop
;*****************************
; fade background screen.
;*****************************
fade_screen:
mov edx,[ModeInfo_PhysBasePtr]
mov edi,edx
xor eax,eax
mov al,0xc5
xor ebx,ebx
mov bl,195
DoLoop:
mov cx,640*2
dec eax
rep stosd
dec ebx
jnz DoLoop
Letsloop:
hlt
jmp Letsloop
;*************************************
; GDT.
;*************************************
gdt: dw 0x0000, 0x0000, 0x0000, 0x0000
sys_data: dw 0xFFFF, 0x0000, 0x9200, 0x00CF
sys_code: dw 0xFFFF, 0x0000, 0x9800, 0x00CF
gdt_end:
gdtr: dw gdt_end - gdt - 1
dd gdt
;*************************************
; Make program 510 byte's + 0xaa55
;*************************************
times 510- ($-start) db 0
dw 0xaa55
;*************************************
; Put uninitialized data here.
;*************************************
;=========================================================;
; Vesa Information Block 11/12/03 ;
;---------------------------------------------------------;
; DOS EXTREME OS V0.01 ;
; by Craig Bamford(Dex). ;
; ;
;=========================================================;
;============================== VESA MODE INFORMATION ===========================================
Mode_Info:
ModeInfo_ModeAttributes rw 1
ModeInfo_WinAAttributes rb 1
ModeInfo_WinBAttributes rb 1
ModeInfo_WinGranularity rw 1
ModeInfo_WinSize rw 1
ModeInfo_WinASegment rw 1
ModeInfo_WinBSegment rw 1
ModeInfo_WinFuncPtr rd 1
ModeInfo_BytesPerScanLine rw 1
ModeInfo_XResolution rw 1
ModeInfo_YResolution rw 1
ModeInfo_XCharSize rb 1
ModeInfo_YCharSize rb 1
ModeInfo_NumberOfPlanes rb 1
ModeInfo_BitsPerPixel rb 1
ModeInfo_NumberOfBanks rb 1
ModeInfo_MemoryModel rb 1
ModeInfo_BankSize rb 1
ModeInfo_NumberOfImagePages rb 1
ModeInfo_Reserved_page rb 1
ModeInfo_RedMaskSize rb 1
ModeInfo_RedMaskPos rb 1
ModeInfo_GreenMaskSize rb 1
ModeInfo_GreenMaskPos rb 1
ModeInfo_BlueMaskSize rb 1
ModeInfo_BlueMaskPos rb 1
ModeInfo_ReservedMaskSize rb 1
ModeInfo_ReservedMaskPos rb 1
ModeInfo_DirectColorModeInfo rb 1
; VBE 2.0 extensions
ModeInfo_PhysBasePtr rd 1
ModeInfo_OffScreenMemOffset rd 1
ModeInfo_OffScreenMemSize rw 1
;======================================= START OF PROGRAM ======================================
Could you please give me more information on configure VESA in GRUB2?KotuxGuy wrote:Yes, this can be done in GRUB, but you're right: To enable/configure VESA in GRUB Legacy, you need the VBE patch( I saw a thread on the forums about this; search for it ). GRUB 2, however, can configure VESA without a patch.
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insmod gfxterm
set gfxmode="1024x768x32,800x600x32,640x480x32,1024x768,800x600,640x480"
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insmod gfxterm
set gfxmode=[resolution you want]
# Like: 1024x768x32 ( which has 32bpp ), 1024x768 ( which will give the highest bpp )