OvmfPkg/QemuVideoDxe: purge VbeShim

The guest os which depends on vbeshim for video support is -- according
to the comments -- Windows 2008 R2.  Which went EOL in January 2020,
more than four years ago.

Time to retire VbeShim.  RIP.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

1 files changed, 0 insertions, 328 deletions

diff --git a/OvmfPkg/QemuVideoDxe/VbeShim.c b/OvmfPkg/QemuVideoDxe/VbeShim.c
deleted file mode 100644
index 8f151b9..0000000
--- a/OvmfPkg/QemuVideoDxe/VbeShim.c
+++ /dev/null
@@ -1,328 +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>

-

-  SPDX-License-Identifier: BSD-2-Clause-Patent

-**/

-

-#include <IndustryStandard/LegacyVgaBios.h>

-#include <Library/DebugLib.h>

-#include <Library/PciLib.h>

-#include <Library/PrintLib.h>

-#include <OvmfPlatforms.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            Segment0AllocationStatus;

-  UINT16                HostBridgeDevId;

-  UINTN                 Pam1Address;

-  UINT8                 Pam1;

-  UINTN                 SegmentCPages;

-  VBE_INFO              *VbeInfoFull;

-  VBE_INFO_BASE         *VbeInfo;

-  UINT8                 *Ptr;

-  UINTN                 Printed;

-  VBE_MODE_INFO         *VbeModeInfo;

-

-  if ((PcdGet8 (PcdNullPointerDetectionPropertyMask) & (BIT0|BIT7)) == BIT0) {

-    DEBUG ((

-      DEBUG_WARN,

-      "%a: page 0 protected, not installing VBE shim\n",

-      __func__

-      ));

-    DEBUG ((

-      DEBUG_WARN,

-      "%a: page 0 protection prevents Windows 7 from booting anyway\n",

-      __func__

-      ));

-    return;

-  }

-

-  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 * sizeof (IVT_ENTRY));

-  Segment0AllocationStatus = gBS->AllocatePages (

-                                    AllocateAddress,

-                                    EfiBootServicesCode,

-                                    Segment0Pages,

-                                    &Segment0

-                                    );

-

-  if (EFI_ERROR (Segment0AllocationStatus)) {

-    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 ((

-        DEBUG_INFO,

-        "%a: Video BIOS handler found at %04x:%04x\n",

-        __func__,

-        Int0x10->Segment,

-        Int0x10->Offset

-        ));

-      return;

-    }

-

-    //

-    // Otherwise we'll overwrite the Int10h vector, even though we may not own

-    // the page at zero.

-    //

-    DEBUG ((

-      DEBUG_INFO,

-      "%a: failed to allocate page at zero: %r\n",

-      __func__,

-      Segment0AllocationStatus

-      ));

-  } 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.

-  //

-  // Start by determining the address of the PAM1 register.

-  //

-  HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);

-  switch (HostBridgeDevId) {

-    case INTEL_82441_DEVICE_ID:

-      Pam1Address = PMC_REGISTER_PIIX4 (PIIX4_PAM1);

-      break;

-    case INTEL_Q35_MCH_DEVICE_ID:

-      Pam1Address = DRAMC_REGISTER_Q35 (MCH_PAM1);

-      break;

-    case MICROVM_PSEUDO_DEVICE_ID:

-      return;

-    default:

-      DEBUG ((

-        DEBUG_ERROR,

-        "%a: unknown host bridge device ID: 0x%04x\n",

-        __func__,

-        HostBridgeDevId

-        ));

-      ASSERT (FALSE);

-

-      if (!EFI_ERROR (Segment0AllocationStatus)) {

-        gBS->FreePages (Segment0, Segment0Pages);

-      }

-

-      return;

-  }

-

-  //

-  // 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 during 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 ((DEBUG_INFO, "%a: VBE shim installed\n", __func__));

-}