diff options
Diffstat (limited to 'DuetPkg/BiosVideoThunkDxe/LegacyBiosThunk.c')
| -rw-r--r-- | DuetPkg/BiosVideoThunkDxe/LegacyBiosThunk.c | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/DuetPkg/BiosVideoThunkDxe/LegacyBiosThunk.c b/DuetPkg/BiosVideoThunkDxe/LegacyBiosThunk.c deleted file mode 100644 index 6dc453ff09..0000000000 --- a/DuetPkg/BiosVideoThunkDxe/LegacyBiosThunk.c +++ /dev/null @@ -1,220 +0,0 @@ -/** @file
- Provide legacy thunk interface for accessing Bios Video Rom.
-
-Copyright (c) 2006 - 2007, 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 "BiosVideo.h"
-
-#define EFI_CPU_EFLAGS_IF 0x200
-
-/**
- Initialize legacy environment for BIOS INI caller.
-
- @param ThunkContext the instance pointer of THUNK_CONTEXT
-**/
-VOID
-InitializeBiosIntCaller (
- THUNK_CONTEXT *ThunkContext
- )
-{
- EFI_STATUS Status;
- UINT32 RealModeBufferSize;
- UINT32 ExtraStackSize;
- EFI_PHYSICAL_ADDRESS LegacyRegionBase;
- UINT32 LegacyRegionSize;
- //
- // Get LegacyRegion
- //
- AsmGetThunk16Properties (&RealModeBufferSize, &ExtraStackSize);
- LegacyRegionSize = (((RealModeBufferSize + ExtraStackSize) / EFI_PAGE_SIZE) + 1) * EFI_PAGE_SIZE;
- LegacyRegionBase = 0x100000;
- Status = gBS->AllocatePages (
- AllocateMaxAddress,
- EfiACPIMemoryNVS,
- EFI_SIZE_TO_PAGES(LegacyRegionSize),
- &LegacyRegionBase
- );
- ASSERT_EFI_ERROR (Status);
-
- ThunkContext->RealModeBuffer = (VOID*)(UINTN)LegacyRegionBase;
- ThunkContext->RealModeBufferSize = LegacyRegionSize;
- ThunkContext->ThunkAttributes = THUNK_ATTRIBUTE_BIG_REAL_MODE|THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15;
- AsmPrepareThunk16(ThunkContext);
-}
-
-/**
- Initialize interrupt redirection code and entries, because
- IDT Vectors 0x68-0x6f must be redirected to IDT Vectors 0x08-0x0f.
- Or the interrupt will lost when we do thunk.
- NOTE: We do not reset 8259 vector base, because it will cause pending
- interrupt lost.
-
- @param Legacy8259 Instance pointer for EFI_LEGACY_8259_PROTOCOL.
-
-**/
-VOID
-InitializeInterruptRedirection (
- IN EFI_LEGACY_8259_PROTOCOL *Legacy8259
- )
-{
- EFI_STATUS Status;
- EFI_PHYSICAL_ADDRESS LegacyRegionBase;
- UINTN LegacyRegionLength;
- UINT32 *IdtArray;
- UINTN Index;
- UINT8 ProtectedModeBaseVector;
- UINT32 InterruptRedirectionCode[] = {
- 0x90CF08CD, // INT8; IRET; NOP
- 0x90CF09CD, // INT9; IRET; NOP
- 0x90CF0ACD, // INTA; IRET; NOP
- 0x90CF0BCD, // INTB; IRET; NOP
- 0x90CF0CCD, // INTC; IRET; NOP
- 0x90CF0DCD, // INTD; IRET; NOP
- 0x90CF0ECD, // INTE; IRET; NOP
- 0x90CF0FCD // INTF; IRET; NOP
- };
-
- //
- // Get LegacyRegion
- //
- LegacyRegionLength = sizeof(InterruptRedirectionCode);
- LegacyRegionBase = 0x100000;
- Status = gBS->AllocatePages (
- AllocateMaxAddress,
- EfiACPIMemoryNVS,
- EFI_SIZE_TO_PAGES(LegacyRegionLength),
- &LegacyRegionBase
- );
- ASSERT_EFI_ERROR (Status);
-
- //
- // Copy code to legacy region
- //
- CopyMem ((VOID *)(UINTN)LegacyRegionBase, InterruptRedirectionCode, sizeof (InterruptRedirectionCode));
-
- //
- // Get VectorBase, it should be 0x68
- //
- Status = Legacy8259->GetVector (Legacy8259, Efi8259Irq0, &ProtectedModeBaseVector);
- ASSERT_EFI_ERROR (Status);
-
- //
- // Patch IVT 0x68 ~ 0x6f
- //
- IdtArray = (UINT32 *) 0;
- for (Index = 0; Index < 8; Index++) {
- IdtArray[ProtectedModeBaseVector + Index] = ((EFI_SEGMENT (LegacyRegionBase + Index * 4)) << 16) | (EFI_OFFSET (LegacyRegionBase + Index * 4));
- }
-
- return ;
-}
-
-/**
- Thunk to 16-bit real mode and execute a software interrupt with a vector
- of BiosInt. Regs will contain the 16-bit register context on entry and
- exit.
-
- @param This Protocol instance pointer.
- @param BiosInt Processor interrupt vector to invoke
- @param Reg Register contexted passed into (and returned) from thunk to 16-bit mode
-
- @retval TRUE Thunk completed, and there were no BIOS errors in the target code.
- See Regs for status.
- @retval FALSE There was a BIOS erro in the target code.
-**/
-BOOLEAN
-EFIAPI
-LegacyBiosInt86 (
- IN BIOS_VIDEO_DEV *BiosDev,
- IN UINT8 BiosInt,
- IN IA32_REGISTER_SET *Regs
- )
-{
- UINTN Status;
- IA32_REGISTER_SET ThunkRegSet;
- BOOLEAN Ret;
- UINT16 *Stack16;
- BOOLEAN Enabled;
-
- ZeroMem (&ThunkRegSet, sizeof (ThunkRegSet));
- ThunkRegSet.E.EFLAGS.Bits.Reserved_0 = 1;
- ThunkRegSet.E.EFLAGS.Bits.Reserved_1 = 0;
- ThunkRegSet.E.EFLAGS.Bits.Reserved_2 = 0;
- ThunkRegSet.E.EFLAGS.Bits.Reserved_3 = 0;
- ThunkRegSet.E.EFLAGS.Bits.IOPL = 3;
- ThunkRegSet.E.EFLAGS.Bits.NT = 0;
- ThunkRegSet.E.EFLAGS.Bits.IF = 1;
- ThunkRegSet.E.EFLAGS.Bits.TF = 0;
- ThunkRegSet.E.EFLAGS.Bits.CF = 0;
-
- ThunkRegSet.E.EDI = Regs->E.EDI;
- ThunkRegSet.E.ESI = Regs->E.ESI;
- ThunkRegSet.E.EBP = Regs->E.EBP;
- ThunkRegSet.E.EBX = Regs->E.EBX;
- ThunkRegSet.E.EDX = Regs->E.EDX;
- ThunkRegSet.E.ECX = Regs->E.ECX;
- ThunkRegSet.E.EAX = Regs->E.EAX;
- ThunkRegSet.E.DS = Regs->E.DS;
- ThunkRegSet.E.ES = Regs->E.ES;
-
- //
- // The call to Legacy16 is a critical section to EFI
- //
- Enabled = SaveAndDisableInterrupts();
-
- //
- // Set Legacy16 state. 0x08, 0x70 is legacy 8259 vector bases.
- //
- Status = BiosDev->Legacy8259->SetMode (BiosDev->Legacy8259, Efi8259LegacyMode, NULL, NULL);
- ASSERT_EFI_ERROR (Status);
-
- Stack16 = (UINT16 *)((UINT8 *) BiosDev->ThunkContext->RealModeBuffer + BiosDev->ThunkContext->RealModeBufferSize - sizeof (UINT16));
-
- ThunkRegSet.E.SS = (UINT16) (((UINTN) Stack16 >> 16) << 12);
- ThunkRegSet.E.ESP = (UINT16) (UINTN) Stack16;
-
- ThunkRegSet.E.Eip = (UINT16)((UINT32 *)NULL)[BiosInt];
- ThunkRegSet.E.CS = (UINT16)(((UINT32 *)NULL)[BiosInt] >> 16);
- BiosDev->ThunkContext->RealModeState = &ThunkRegSet;
- AsmThunk16 (BiosDev->ThunkContext);
-
- //
- // Restore protected mode interrupt state
- //
- Status = BiosDev->Legacy8259->SetMode (BiosDev->Legacy8259, Efi8259ProtectedMode, NULL, NULL);
- ASSERT_EFI_ERROR (Status);
-
- //
- // End critical section
- //
- SetInterruptState (Enabled);
-
- Regs->E.EDI = ThunkRegSet.E.EDI;
- Regs->E.ESI = ThunkRegSet.E.ESI;
- Regs->E.EBP = ThunkRegSet.E.EBP;
- Regs->E.EBX = ThunkRegSet.E.EBX;
- Regs->E.EDX = ThunkRegSet.E.EDX;
- Regs->E.ECX = ThunkRegSet.E.ECX;
- Regs->E.EAX = ThunkRegSet.E.EAX;
- Regs->E.SS = ThunkRegSet.E.SS;
- Regs->E.CS = ThunkRegSet.E.CS;
- Regs->E.DS = ThunkRegSet.E.DS;
- Regs->E.ES = ThunkRegSet.E.ES;
-
- CopyMem (&(Regs->E.EFLAGS), &(ThunkRegSet.E.EFLAGS), sizeof (UINT32));
-
- Ret = (BOOLEAN) (Regs->E.EFLAGS.Bits.CF == 1);
-
- return Ret;
-}
-
-
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