mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-01 12:53:27 +01:00
343 lines
6.9 KiB
NASM
343 lines
6.9 KiB
NASM
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;------------------------------------------------------------------------------
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; @file
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; A minimal Int10h stub that allows the Windows 2008 R2 SP1 UEFI guest's buggy,
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; default VGA driver to switch to 1024x768x32.
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;
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; Copyright (C) 2020, Rebecca Cran <rebecca@bsdio.com>
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; Copyright (C) 2015, Nahanni Systems, Inc.
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; Copyright (C) 2014, Red Hat, Inc.
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; Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.<BR>
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;
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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;------------------------------------------------------------------------------
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; enable this macro for debug messages
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%define DEBUG
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%macro DebugLog 1
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%ifdef DEBUG
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push si
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mov si, %1
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call PrintStringSi
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pop si
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%endif
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%endmacro
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BITS 16
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ORG 0
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VbeInfo:
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TIMES 256 nop
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VbeModeInfo:
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VbeMode1:
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TIMES 50 nop
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VbeMode2:
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TIMES 50 nop
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VbeMode3:
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TIMES 50 nop
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VbeMode4:
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TIMES 50 nop
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TIMES 56 nop ; filler for 256 bytes
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Handler:
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cmp ax, 0x4f00
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je GetInfo
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cmp ax, 0x4f01
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je GetModeInfo
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cmp ax, 0x4f02
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je SetMode
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cmp ax, 0x4f03
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je GetMode
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cmp ax, 0x4f10
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je GetPmCapabilities
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cmp ax, 0x4f15
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je ReadEdid
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cmp ah, 0x00
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je SetModeLegacy
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DebugLog StrUnkownFunction
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Hang:
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jmp Hang
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GetInfo:
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push es
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push di
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push ds
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push si
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push cx
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DebugLog StrEnterGetInfo
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; target (es:di) set on input
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push cs
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pop ds
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mov si, VbeInfo
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; source (ds:si) set now
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mov cx, 256
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cld
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rep movsb
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pop cx
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pop si
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pop ds
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pop di
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pop es
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jmp Success
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GetModeInfo:
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push es
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push di
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push ds
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push si
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push cx
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DebugLog StrEnterGetModeInfo
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and cx, ~0x4000 ; clear potentially set LFB bit in mode number
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cmp cx, 0x013f
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je gKnownMode1
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cmp cx, 0x0140
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je gKnownMode2
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cmp cx, 0x0141
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je gKnownMode3
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DebugLog StrUnkownMode
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jmp Hang
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gKnownMode1:
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DebugLog StrMode1
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mov si, VbeMode1
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jmp CopyModeInfo
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gKnownMode2:
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DebugLog StrMode2
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mov si, VbeMode2
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jmp CopyModeInfo
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gKnownMode3:
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DebugLog StrMode3
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mov si, VbeMode3
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jmp CopyModeInfo
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gKnownMode4:
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DebugLog StrMode4
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mov si, VbeMode4
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jmp CopyModeInfo
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CopyModeInfo:
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; target (es:di) set on input
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push cs
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pop ds
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;mov si, VbeModeInfo
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; source (ds:si) set now
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;mov cx, 256
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mov cx, 50
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cld
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rep movsb
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pop cx
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pop si
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pop ds
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pop di
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pop es
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jmp Success
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SetMode:
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push dx
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push ax
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DebugLog StrEnterSetMode
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and bx, ~0x4000 ; clear potentially set LFB bit in mode number
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cmp bx, 0x013f
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je KnownMode1
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cmp bx, 0x0140
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je KnownMode2
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cmp bx, 0x0141
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je KnownMode3
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DebugLog StrUnkownMode
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jmp Hang
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KnownMode1:
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DebugLog StrMode1
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jmp SetModeDone
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KnownMode2:
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DebugLog StrMode2
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jmp SetModeDone
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KnownMode3:
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DebugLog StrMode3
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jmp SetModeDone
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KnownMode4:
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DebugLog StrMode4
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SetModeDone:
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mov [CurMode], bl
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mov [CurMode+1], bh
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pop ax
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pop dx
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jmp Success
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GetMode:
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DebugLog StrEnterGetMode
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mov bl, [CurMode]
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mov bh, [CurMode+1]
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jmp Success
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GetPmCapabilities:
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DebugLog StrGetPmCapabilities
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mov bx, 0x0080
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jmp Success
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ReadEdid:
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push es
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push di
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push ds
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push si
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push cx
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DebugLog StrReadEdid
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; target (es:di) set on input
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push cs
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pop ds
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mov si, Edid
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; source (ds:si) set now
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mov cx, 128
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cld
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rep movsb
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pop cx
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pop si
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pop ds
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pop di
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pop es
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jmp Success
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SetModeLegacy:
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DebugLog StrEnterSetModeLegacy
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cmp al, 0x03
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je sKnownMode3
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cmp al, 0x12
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je sKnownMode4
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DebugLog StrUnkownMode
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jmp Hang
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sKnownMode3:
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DebugLog StrLegacyMode3
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mov al, 0 ; 0x30
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jmp SetModeLegacyDone
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sKnownMode4:
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mov al, 0 ;0x20
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SetModeLegacyDone:
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DebugLog StrExitSuccess
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iret
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Success:
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DebugLog StrExitSuccess
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mov ax, 0x004f
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iret
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Unsupported:
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DebugLog StrExitUnsupported
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mov ax, 0x024f
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iret
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%ifdef DEBUG
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PrintStringSi:
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pusha
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push ds ; save original
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push cs
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pop ds
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mov dx, 0x220 ; bhyve debug cons port
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mov ax, 0
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PrintStringSiLoop:
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lodsb
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cmp al, 0
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je PrintStringSiDone
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out dx, al
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jmp PrintStringSiLoop
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PrintStringSiDone:
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pop ds ; restore original
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popa
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ret
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StrExitSuccess:
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db 'vOk', 0x0d, 0x0a, 0
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StrExitUnsupported:
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db 'vUnsupported', 0x0d, 0x0a, 0
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StrUnkownFunction:
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db 'vUnknown Function', 0x0d, 0x0a, 0
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StrEnterGetInfo:
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db 'vGetInfo', 0x0d, 0x0a, 0
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StrEnterGetModeInfo:
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db 'vGetModeInfo', 0x0d, 0x0a, 0
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StrEnterGetMode:
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db 'vGetMode', 0x0d, 0x0a, 0
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StrEnterSetMode:
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db 'vSetMode', 0x0d, 0x0a, 0
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StrEnterSetModeLegacy:
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db 'vSetModeLegacy', 0x0d, 0x0a, 0
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StrUnkownMode:
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db 'vUnkown Mode', 0x0d, 0x0a, 0
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StrGetPmCapabilities:
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db 'vGetPmCapabilities', 0x0d, 0x0a, 0
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StrReadEdid:
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db 'vReadEdid', 0x0d, 0x0a, 0
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StrLegacyMode3:
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db 'vLegacyMode3', 0x0d, 0x0a, 0
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StrMode1:
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db 'mode_640x480x32', 0x0d, 0x0a, 0
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StrMode2:
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db 'mode_800x600x32', 0x0d, 0x0a, 0
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StrMode3:
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db 'mode_1024x768x32', 0x0d, 0x0a, 0
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StrMode4:
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db 'mode_unused', 0x0d, 0x0a, 0
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%endif
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CurMode:
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db 0x00, 0x00
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;
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; EDID stores monitor information. For now, just send back an null item.
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;
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Edid:
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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db 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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