diff options
Diffstat (limited to 'OvmfPkg/QemuVideoDxe/VbeShim.c')
| -rw-r--r-- | OvmfPkg/QemuVideoDxe/VbeShim.c | 275 |
1 files changed, 0 insertions, 275 deletions
diff --git a/OvmfPkg/QemuVideoDxe/VbeShim.c b/OvmfPkg/QemuVideoDxe/VbeShim.c deleted file mode 100644 index 6bb175bfd4..0000000000 --- a/OvmfPkg/QemuVideoDxe/VbeShim.c +++ /dev/null @@ -1,275 +0,0 @@ -/** @file
- Install a fake VGABIOS service handler (real mode Int10h) for the buggy
- Windows 2008 R2 SP1 UEFI guest.
-
- The handler is never meant to be directly executed by a VCPU; it's there for
- the internal real mode emulator of Windows 2008 R2 SP1.
-
- The code is based on Ralf Brown's Interrupt List:
- <http://www.cs.cmu.edu/~ralf/files.html>
- <http://www.ctyme.com/rbrown.htm>
-
- Copyright (C) 2014, Red Hat, Inc.
- Copyright (c) 2013 - 2014, Intel Corporation. All rights reserved.<BR>
-
- This program and the accompanying materials are licensed and made available
- under the terms and conditions of the BSD License which accompanies this
- distribution. The full text of the license may be found at
- http://opensource.org/licenses/bsd-license.php
-
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
- WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-**/
-
-#include <IndustryStandard/LegacyVgaBios.h>
-#include <Library/DebugLib.h>
-#include <Library/PciLib.h>
-#include <Library/PrintLib.h>
-
-#include "Qemu.h"
-#include "VbeShim.h"
-
-#pragma pack (1)
-typedef struct {
- UINT16 Offset;
- UINT16 Segment;
-} IVT_ENTRY;
-#pragma pack ()
-
-//
-// This string is displayed by Windows 2008 R2 SP1 in the Screen Resolution,
-// Advanced Settings dialog. It should be short.
-//
-STATIC CONST CHAR8 mProductRevision[] = "OVMF Int10h (fake)";
-
-/**
- Install the VBE Info and VBE Mode Info structures, and the VBE service
- handler routine in the C segment. Point the real-mode Int10h interrupt vector
- to the handler. The only advertised mode is 1024x768x32.
-
- @param[in] CardName Name of the video card to be exposed in the
- Product Name field of the VBE Info structure. The
- parameter must originate from a
- QEMU_VIDEO_CARD.Name field.
- @param[in] FrameBufferBase Guest-physical base address of the video card's
- frame buffer.
-**/
-VOID
-InstallVbeShim (
- IN CONST CHAR16 *CardName,
- IN EFI_PHYSICAL_ADDRESS FrameBufferBase
- )
-{
- EFI_PHYSICAL_ADDRESS Segment0, SegmentC, SegmentF;
- UINTN Segment0Pages;
- IVT_ENTRY *Int0x10;
- EFI_STATUS Status;
- UINTN Pam1Address;
- UINT8 Pam1;
- UINTN SegmentCPages;
- VBE_INFO *VbeInfoFull;
- VBE_INFO_BASE *VbeInfo;
- UINT8 *Ptr;
- UINTN Printed;
- VBE_MODE_INFO *VbeModeInfo;
-
- Segment0 = 0x00000;
- SegmentC = 0xC0000;
- SegmentF = 0xF0000;
-
- //
- // Attempt to cover the real mode IVT with an allocation. This is a UEFI
- // driver, hence the arch protocols have been installed previously. Among
- // those, the CPU arch protocol has configured the IDT, so we can overwrite
- // the IVT used in real mode.
- //
- // The allocation request may fail, eg. if LegacyBiosDxe has already run.
- //
- Segment0Pages = 1;
- Int0x10 = (IVT_ENTRY *)(UINTN)Segment0 + 0x10;
- Status = gBS->AllocatePages (AllocateAddress, EfiBootServicesCode,
- Segment0Pages, &Segment0);
-
- if (EFI_ERROR (Status)) {
- EFI_PHYSICAL_ADDRESS Handler;
-
- //
- // Check if a video BIOS handler has been installed previously -- we
- // shouldn't override a real video BIOS with our shim, nor our own shim if
- // it's already present.
- //
- Handler = (Int0x10->Segment << 4) + Int0x10->Offset;
- if (Handler >= SegmentC && Handler < SegmentF) {
- DEBUG ((EFI_D_VERBOSE, "%a: Video BIOS handler found at %04x:%04x\n",
- __FUNCTION__, Int0x10->Segment, Int0x10->Offset));
- return;
- }
-
- //
- // Otherwise we'll overwrite the Int10h vector, even though we may not own
- // the page at zero.
- //
- DEBUG ((EFI_D_VERBOSE, "%a: failed to allocate page at zero: %r\n",
- __FUNCTION__, Status));
- } else {
- //
- // We managed to allocate the page at zero. SVN r14218 guarantees that it
- // is NUL-filled.
- //
- ASSERT (Int0x10->Segment == 0x0000);
- ASSERT (Int0x10->Offset == 0x0000);
- }
-
- //
- // Put the shim in place first.
- //
- Pam1Address = PCI_LIB_ADDRESS (0, 0, 0, 0x5A);
- //
- // low nibble covers 0xC0000 to 0xC3FFF
- // high nibble covers 0xC4000 to 0xC7FFF
- // bit1 in each nibble is Write Enable
- // bit0 in each nibble is Read Enable
- //
- Pam1 = PciRead8 (Pam1Address);
- PciWrite8 (Pam1Address, Pam1 | (BIT1 | BIT0));
-
- //
- // We never added memory space durig PEI or DXE for the C segment, so we
- // don't need to (and can't) allocate from there. Also, guest operating
- // systems will see a hole in the UEFI memory map there.
- //
- SegmentCPages = 4;
-
- ASSERT (sizeof mVbeShim <= EFI_PAGES_TO_SIZE (SegmentCPages));
- CopyMem ((VOID *)(UINTN)SegmentC, mVbeShim, sizeof mVbeShim);
-
- //
- // Fill in the VBE INFO structure.
- //
- VbeInfoFull = (VBE_INFO *)(UINTN)SegmentC;
- VbeInfo = &VbeInfoFull->Base;
- Ptr = VbeInfoFull->Buffer;
-
- CopyMem (VbeInfo->Signature, "VESA", 4);
- VbeInfo->VesaVersion = 0x0300;
-
- VbeInfo->OemNameAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
- CopyMem (Ptr, "QEMU", 5);
- Ptr += 5;
-
- VbeInfo->Capabilities = BIT0; // DAC can be switched into 8-bit mode
-
- VbeInfo->ModeListAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
- *(UINT16*)Ptr = 0x00f1; // mode number
- Ptr += 2;
- *(UINT16*)Ptr = 0xFFFF; // mode list terminator
- Ptr += 2;
-
- VbeInfo->VideoMem64K = (UINT16)((1024 * 768 * 4 + 65535) / 65536);
- VbeInfo->OemSoftwareVersion = 0x0000;
-
- VbeInfo->VendorNameAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
- CopyMem (Ptr, "OVMF", 5);
- Ptr += 5;
-
- VbeInfo->ProductNameAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
- Printed = AsciiSPrint ((CHAR8 *)Ptr,
- sizeof VbeInfoFull->Buffer - (Ptr - VbeInfoFull->Buffer), "%s",
- CardName);
- Ptr += Printed + 1;
-
- VbeInfo->ProductRevAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
- CopyMem (Ptr, mProductRevision, sizeof mProductRevision);
- Ptr += sizeof mProductRevision;
-
- ASSERT (sizeof VbeInfoFull->Buffer >= Ptr - VbeInfoFull->Buffer);
- ZeroMem (Ptr, sizeof VbeInfoFull->Buffer - (Ptr - VbeInfoFull->Buffer));
-
- //
- // Fil in the VBE MODE INFO structure.
- //
- VbeModeInfo = (VBE_MODE_INFO *)(VbeInfoFull + 1);
-
- //
- // bit0: mode supported by present hardware configuration
- // bit1: optional information available (must be =1 for VBE v1.2+)
- // bit3: set if color, clear if monochrome
- // bit4: set if graphics mode, clear if text mode
- // bit5: mode is not VGA-compatible
- // bit7: linear framebuffer mode supported
- //
- VbeModeInfo->ModeAttr = BIT7 | BIT5 | BIT4 | BIT3 | BIT1 | BIT0;
-
- //
- // bit0: exists
- // bit1: bit1: readable
- // bit2: writeable
- //
- VbeModeInfo->WindowAAttr = BIT2 | BIT1 | BIT0;
-
- VbeModeInfo->WindowBAttr = 0x00;
- VbeModeInfo->WindowGranularityKB = 0x0040;
- VbeModeInfo->WindowSizeKB = 0x0040;
- VbeModeInfo->WindowAStartSegment = 0xA000;
- VbeModeInfo->WindowBStartSegment = 0x0000;
- VbeModeInfo->WindowPositioningAddress = 0x0000;
- VbeModeInfo->BytesPerScanLine = 1024 * 4;
-
- VbeModeInfo->Width = 1024;
- VbeModeInfo->Height = 768;
- VbeModeInfo->CharCellWidth = 8;
- VbeModeInfo->CharCellHeight = 16;
- VbeModeInfo->NumPlanes = 1;
- VbeModeInfo->BitsPerPixel = 32;
- VbeModeInfo->NumBanks = 1;
- VbeModeInfo->MemoryModel = 6; // direct color
- VbeModeInfo->BankSizeKB = 0;
- VbeModeInfo->NumImagePagesLessOne = 0;
- VbeModeInfo->Vbe3 = 0x01;
-
- VbeModeInfo->RedMaskSize = 8;
- VbeModeInfo->RedMaskPos = 16;
- VbeModeInfo->GreenMaskSize = 8;
- VbeModeInfo->GreenMaskPos = 8;
- VbeModeInfo->BlueMaskSize = 8;
- VbeModeInfo->BlueMaskPos = 0;
- VbeModeInfo->ReservedMaskSize = 8;
- VbeModeInfo->ReservedMaskPos = 24;
-
- //
- // bit1: Bytes in reserved field may be used by application
- //
- VbeModeInfo->DirectColorModeInfo = BIT1;
-
- VbeModeInfo->LfbAddress = (UINT32)FrameBufferBase;
- VbeModeInfo->OffScreenAddress = 0;
- VbeModeInfo->OffScreenSizeKB = 0;
-
- VbeModeInfo->BytesPerScanLineLinear = 1024 * 4;
- VbeModeInfo->NumImagesLessOneBanked = 0;
- VbeModeInfo->NumImagesLessOneLinear = 0;
- VbeModeInfo->RedMaskSizeLinear = 8;
- VbeModeInfo->RedMaskPosLinear = 16;
- VbeModeInfo->GreenMaskSizeLinear = 8;
- VbeModeInfo->GreenMaskPosLinear = 8;
- VbeModeInfo->BlueMaskSizeLinear = 8;
- VbeModeInfo->BlueMaskPosLinear = 0;
- VbeModeInfo->ReservedMaskSizeLinear = 8;
- VbeModeInfo->ReservedMaskPosLinear = 24;
- VbeModeInfo->MaxPixelClockHz = 0;
-
- ZeroMem (VbeModeInfo->Reserved, sizeof VbeModeInfo->Reserved);
-
- //
- // Clear Write Enable (bit1), keep Read Enable (bit0) set
- //
- PciWrite8 (Pam1Address, (Pam1 & ~BIT1) | BIT0);
-
- //
- // Second, point the Int10h vector at the shim.
- //
- Int0x10->Segment = (UINT16) ((UINT32)SegmentC >> 4);
- Int0x10->Offset = (UINT16) ((UINTN) (VbeModeInfo + 1) - SegmentC);
-
- DEBUG ((EFI_D_INFO, "%a: VBE shim installed\n", __FUNCTION__));
-}
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