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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
|
|
