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audk/OvmfPkg/Bhyve/BhyveRfbDxe/VbeShim.asm

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;------------------------------------------------------------------------------
; @file
; A minimal Int10h stub that allows the Windows 2008 R2 SP1 UEFI guest's buggy,
; default VGA driver to switch to 1024x768x32.
;
; Copyright (C) 2020, Rebecca Cran <rebecca@bsdio.com>
; Copyright (C) 2015, Nahanni Systems, Inc.
; Copyright (C) 2014, Red Hat, Inc.
; Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.<BR>
;
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
;------------------------------------------------------------------------------
; enable this macro for debug messages
%define DEBUG
%macro DebugLog 1
%ifdef DEBUG
push si
mov si, %1
call PrintStringSi
pop si
%endif
%endmacro
BITS 16
ORG 0
VbeInfo:
TIMES 256 nop
VbeModeInfo:
VbeMode1:
TIMES 50 nop
VbeMode2:
TIMES 50 nop
VbeMode3:
TIMES 50 nop
VbeMode4:
TIMES 50 nop
TIMES 56 nop ; filler for 256 bytes
Handler:
cmp ax, 0x4f00
je GetInfo
cmp ax, 0x4f01
je GetModeInfo
cmp ax, 0x4f02
je SetMode
cmp ax, 0x4f03
je GetMode
cmp ax, 0x4f10
je GetPmCapabilities
cmp ax, 0x4f15
je ReadEdid
cmp ah, 0x00
je SetModeLegacy
DebugLog StrUnkownFunction
Hang:
jmp Hang
GetInfo:
push es
push di
push ds
push si
push cx
DebugLog StrEnterGetInfo
; target (es:di) set on input
push cs
pop ds
mov si, VbeInfo
; source (ds:si) set now
mov cx, 256
cld
rep movsb
pop cx
pop si
pop ds
pop di
pop es
jmp Success
GetModeInfo:
push es
push di
push ds
push si
push cx
DebugLog StrEnterGetModeInfo
and cx, ~0x4000 ; clear potentially set LFB bit in mode number
cmp cx, 0x013f
je gKnownMode1
cmp cx, 0x0140
je gKnownMode2
cmp cx, 0x0141
je gKnownMode3
DebugLog StrUnkownMode
jmp Hang
gKnownMode1:
DebugLog StrMode1
mov si, VbeMode1
jmp CopyModeInfo
gKnownMode2:
DebugLog StrMode2
mov si, VbeMode2
jmp CopyModeInfo
gKnownMode3:
DebugLog StrMode3
mov si, VbeMode3
jmp CopyModeInfo
gKnownMode4:
DebugLog StrMode4
mov si, VbeMode4
jmp CopyModeInfo
CopyModeInfo:
; target (es:di) set on input
push cs
pop ds
;mov si, VbeModeInfo
; source (ds:si) set now
;mov cx, 256
mov cx, 50
cld
rep movsb
pop cx
pop si
pop ds
pop di
pop es
jmp Success
SetMode:
push dx
push ax
DebugLog StrEnterSetMode
and bx, ~0x4000 ; clear potentially set LFB bit in mode number
cmp bx, 0x013f
je KnownMode1
cmp bx, 0x0140
je KnownMode2
cmp bx, 0x0141
je KnownMode3
DebugLog StrUnkownMode
jmp Hang
KnownMode1:
DebugLog StrMode1
jmp SetModeDone
KnownMode2:
DebugLog StrMode2
jmp SetModeDone
KnownMode3:
DebugLog StrMode3
jmp SetModeDone
KnownMode4:
DebugLog StrMode4
SetModeDone:
mov [CurMode], bl
mov [CurMode+1], bh
pop ax
pop dx
jmp Success
GetMode:
DebugLog StrEnterGetMode
mov bl, [CurMode]
mov bh, [CurMode+1]
jmp Success
GetPmCapabilities:
DebugLog StrGetPmCapabilities
mov bx, 0x0080
jmp Success
ReadEdid:
push es
push di
push ds
push si
push cx
DebugLog StrReadEdid
; target (es:di) set on input
push cs
pop ds
mov si, Edid
; source (ds:si) set now
mov cx, 128
cld
rep movsb
pop cx
pop si
pop ds
pop di
pop es
jmp Success
SetModeLegacy:
DebugLog StrEnterSetModeLegacy
cmp al, 0x03
je sKnownMode3
cmp al, 0x12
je sKnownMode4
DebugLog StrUnkownMode
jmp Hang
sKnownMode3:
DebugLog StrLegacyMode3
mov al, 0 ; 0x30
jmp SetModeLegacyDone
sKnownMode4:
mov al, 0 ;0x20
SetModeLegacyDone:
DebugLog StrExitSuccess
iret
Success:
DebugLog StrExitSuccess
mov ax, 0x004f
iret
Unsupported:
DebugLog StrExitUnsupported
mov ax, 0x024f
iret
%ifdef DEBUG
PrintStringSi:
pusha
push ds ; save original
push cs
pop ds
mov dx, 0x220 ; bhyve debug cons port
mov ax, 0
PrintStringSiLoop:
lodsb
cmp al, 0
je PrintStringSiDone
out dx, al
jmp PrintStringSiLoop
PrintStringSiDone:
pop ds ; restore original
popa
ret
StrExitSuccess:
db 'vOk', 0x0d, 0x0a, 0
StrExitUnsupported:
db 'vUnsupported', 0x0d, 0x0a, 0
StrUnkownFunction:
db 'vUnknown Function', 0x0d, 0x0a, 0
StrEnterGetInfo:
db 'vGetInfo', 0x0d, 0x0a, 0
StrEnterGetModeInfo:
db 'vGetModeInfo', 0x0d, 0x0a, 0
StrEnterGetMode:
db 'vGetMode', 0x0d, 0x0a, 0
StrEnterSetMode:
db 'vSetMode', 0x0d, 0x0a, 0
StrEnterSetModeLegacy:
db 'vSetModeLegacy', 0x0d, 0x0a, 0
StrUnkownMode:
db 'vUnkown Mode', 0x0d, 0x0a, 0
StrGetPmCapabilities:
db 'vGetPmCapabilities', 0x0d, 0x0a, 0
StrReadEdid:
db 'vReadEdid', 0x0d, 0x0a, 0
StrLegacyMode3:
db 'vLegacyMode3', 0x0d, 0x0a, 0
StrMode1:
db 'mode_640x480x32', 0x0d, 0x0a, 0
StrMode2:
db 'mode_800x600x32', 0x0d, 0x0a, 0
StrMode3:
db 'mode_1024x768x32', 0x0d, 0x0a, 0
StrMode4:
db 'mode_unused', 0x0d, 0x0a, 0
%endif
CurMode:
db 0x00, 0x00
;
; EDID stores monitor information. For now, just send back an null item.
;
Edid:
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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