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Kernel: Much improved BochsVGA (BXVGA) support.

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Instead of cowboy-calling the VESA BIOS in the bootloader, find the emulator
VGA adapter by scanning the PCI bus. Then set up the desired video mode by
sending device commands.
This commit is contained in:
Andreas Kling 2019-02-06 10:17:26 +01:00
parent e9f6508ada
commit 731fc5a7c8
16 changed files with 298 additions and 114 deletions
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37
Kernel/Boot/boot.asm
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@ -9,43 +9,6 @@ boot:
mov ss, ax
mov sp, 0xffff
; get vesa modes
mov ax, 0x4f00
xor dx, dx
mov es, dx
mov di, 0xc000
mov [es:di], byte 'V'
mov [es:di+1], byte 'B'
mov [es:di+2], byte 'E'
mov [es:di+3], byte '2'
int 0x10
cmp ax, 0x004f
jne fug
cmp [es:di], byte 'V'
jne fug
cmp [es:di+1], byte 'E'
jne fug
cmp [es:di+2], byte 'S'
jne fug
cmp [es:di+3], byte 'A'
jne fug
; get vesa info
mov ax, 0x4f01
mov cx, 0x144
xor dx, dx
mov es, dx
mov di, 0x2000
int 0x10
cmp ax, 0x004f
jne fug
mov ax, 0x4f02
mov bx, 0x4144
int 0x10
cmp ax, 0x004f
jne fug
push cs
pop ds
xor bx, bx