| /** @file | |
| Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR> | |
| SPDX-License-Identifier: BSD-2-Clause-Patent | |
| **/ | |
| #include "LegacyBiosInterface.h" | |
| #define PHYSICAL_ADDRESS_TO_POINTER(Address) ((VOID *) ((UINTN) Address)) | |
| // | |
| // define maximum number of HDD system supports | |
| // | |
| #define MAX_HDD_ENTRIES 0x30 | |
| // | |
| // Module Global: | |
| // Since this driver will only ever produce one instance of the Private Data | |
| // protocol you are not required to dynamically allocate the PrivateData. | |
| // | |
| LEGACY_BIOS_INSTANCE mPrivateData; | |
| // | |
| // The SMBIOS table in EfiRuntimeServicesData memory | |
| // | |
| VOID *mRuntimeSmbiosEntryPoint = NULL; | |
| // | |
| // The SMBIOS table in EfiReservedMemoryType memory | |
| // | |
| EFI_PHYSICAL_ADDRESS mReserveSmbiosEntryPoint = 0; | |
| EFI_PHYSICAL_ADDRESS mStructureTableAddress = 0; | |
| UINTN mStructureTablePages = 0; | |
| BOOLEAN mEndOfDxe = FALSE; | |
| /** | |
| Allocate memory for legacy usage. The memory is executable. | |
| @param AllocateType The type of allocation to perform. | |
| @param MemoryType The type of memory to allocate. | |
| @param StartPageAddress Start address of range | |
| @param Pages Number of pages to allocate | |
| @param Result Result of allocation | |
| @retval EFI_SUCCESS Legacy memory is allocated successfully. | |
| @retval Other Legacy memory is not allocated. | |
| **/ | |
| EFI_STATUS | |
| AllocateLegacyMemory ( | |
| IN EFI_ALLOCATE_TYPE AllocateType, | |
| IN EFI_MEMORY_TYPE MemoryType, | |
| IN EFI_PHYSICAL_ADDRESS StartPageAddress, | |
| IN UINTN Pages, | |
| OUT EFI_PHYSICAL_ADDRESS *Result | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_PHYSICAL_ADDRESS MemPage; | |
| EFI_GCD_MEMORY_SPACE_DESCRIPTOR MemDesc; | |
| // | |
| // Allocate Pages of memory less <= StartPageAddress | |
| // | |
| MemPage = (EFI_PHYSICAL_ADDRESS)(UINTN)StartPageAddress; | |
| Status = gBS->AllocatePages ( | |
| AllocateType, | |
| MemoryType, | |
| Pages, | |
| &MemPage | |
| ); | |
| // | |
| // Do not ASSERT on Status error but let caller decide since some cases | |
| // memory is already taken but that is ok. | |
| // | |
| if (!EFI_ERROR (Status)) { | |
| if (MemoryType != EfiBootServicesCode) { | |
| // | |
| // Make sure that the buffer can be used to store code. | |
| // | |
| Status = gDS->GetMemorySpaceDescriptor (MemPage, &MemDesc); | |
| if (!EFI_ERROR (Status) && ((MemDesc.Attributes & EFI_MEMORY_XP) != 0)) { | |
| Status = gDS->SetMemorySpaceAttributes ( | |
| MemPage, | |
| EFI_PAGES_TO_SIZE (Pages), | |
| MemDesc.Attributes & (~EFI_MEMORY_XP) | |
| ); | |
| } | |
| if (EFI_ERROR (Status)) { | |
| gBS->FreePages (MemPage, Pages); | |
| } | |
| } | |
| } | |
| if (!EFI_ERROR (Status)) { | |
| *Result = (EFI_PHYSICAL_ADDRESS)(UINTN)MemPage; | |
| } | |
| return Status; | |
| } | |
| /** | |
| This function is called when EFI needs to reserve an area in the 0xE0000 or 0xF0000 | |
| 64 KB blocks. | |
| Note: inconsistency with the Framework CSM spec. Per the spec, this function may be | |
| invoked only once. This limitation is relaxed to allow multiple calls in this implementation. | |
| @param This Protocol instance pointer. | |
| @param LegacyMemorySize Size of required region | |
| @param Region Region to use. 00 = Either 0xE0000 or 0xF0000 | |
| block Bit0 = 1 0xF0000 block Bit1 = 1 0xE0000 | |
| block | |
| @param Alignment Address alignment. Bit mapped. First non-zero | |
| bit from right is alignment. | |
| @param LegacyMemoryAddress Region Assigned | |
| @retval EFI_SUCCESS Region assigned | |
| @retval EFI_ACCESS_DENIED Procedure previously invoked | |
| @retval Other Region not assigned | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| LegacyBiosGetLegacyRegion ( | |
| IN EFI_LEGACY_BIOS_PROTOCOL *This, | |
| IN UINTN LegacyMemorySize, | |
| IN UINTN Region, | |
| IN UINTN Alignment, | |
| OUT VOID **LegacyMemoryAddress | |
| ) | |
| { | |
| LEGACY_BIOS_INSTANCE *Private; | |
| EFI_IA32_REGISTER_SET Regs; | |
| EFI_STATUS Status; | |
| UINT32 Granularity; | |
| Private = LEGACY_BIOS_INSTANCE_FROM_THIS (This); | |
| Private->LegacyRegion->UnLock (Private->LegacyRegion, 0xE0000, 0x20000, &Granularity); | |
| ZeroMem (&Regs, sizeof (EFI_IA32_REGISTER_SET)); | |
| Regs.X.AX = Legacy16GetTableAddress; | |
| Regs.X.BX = (UINT16)Region; | |
| Regs.X.CX = (UINT16)LegacyMemorySize; | |
| Regs.X.DX = (UINT16)Alignment; | |
| Private->LegacyBios.FarCall86 ( | |
| &Private->LegacyBios, | |
| Private->Legacy16CallSegment, | |
| Private->Legacy16CallOffset, | |
| &Regs, | |
| NULL, | |
| 0 | |
| ); | |
| if (Regs.X.AX == 0) { | |
| *LegacyMemoryAddress = (VOID *)(((UINTN)Regs.X.DS << 4) + Regs.X.BX); | |
| Status = EFI_SUCCESS; | |
| } else { | |
| Status = EFI_OUT_OF_RESOURCES; | |
| } | |
| Private->Cpu->FlushDataCache (Private->Cpu, 0xE0000, 0x20000, EfiCpuFlushTypeWriteBackInvalidate); | |
| Private->LegacyRegion->Lock (Private->LegacyRegion, 0xE0000, 0x20000, &Granularity); | |
| return Status; | |
| } | |
| /** | |
| This function is called when copying data to the region assigned by | |
| EFI_LEGACY_BIOS_PROTOCOL.GetLegacyRegion(). | |
| @param This Protocol instance pointer. | |
| @param LegacyMemorySize Size of data to copy | |
| @param LegacyMemoryAddress Legacy Region destination address Note: must | |
| be in region assigned by | |
| LegacyBiosGetLegacyRegion | |
| @param LegacyMemorySourceAddress Source of data | |
| @retval EFI_SUCCESS The data was copied successfully. | |
| @retval EFI_ACCESS_DENIED Either the starting or ending address is out of bounds. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| LegacyBiosCopyLegacyRegion ( | |
| IN EFI_LEGACY_BIOS_PROTOCOL *This, | |
| IN UINTN LegacyMemorySize, | |
| IN VOID *LegacyMemoryAddress, | |
| IN VOID *LegacyMemorySourceAddress | |
| ) | |
| { | |
| LEGACY_BIOS_INSTANCE *Private; | |
| UINT32 Granularity; | |
| if ((LegacyMemoryAddress < (VOID *)(UINTN)0xE0000) || | |
| ((UINTN)LegacyMemoryAddress + LegacyMemorySize > (UINTN)0x100000) | |
| ) | |
| { | |
| return EFI_ACCESS_DENIED; | |
| } | |
| // | |
| // There is no protection from writes over lapping if this function is | |
| // called multiple times. | |
| // | |
| Private = LEGACY_BIOS_INSTANCE_FROM_THIS (This); | |
| Private->LegacyRegion->UnLock (Private->LegacyRegion, 0xE0000, 0x20000, &Granularity); | |
| CopyMem (LegacyMemoryAddress, LegacyMemorySourceAddress, LegacyMemorySize); | |
| Private->Cpu->FlushDataCache (Private->Cpu, 0xE0000, 0x20000, EfiCpuFlushTypeWriteBackInvalidate); | |
| Private->LegacyRegion->Lock (Private->LegacyRegion, 0xE0000, 0x20000, &Granularity); | |
| return EFI_SUCCESS; | |
| } | |
| /** | |
| Find Legacy16 BIOS image in the FLASH device and shadow it into memory. Find | |
| the $EFI table in the shadow area. Thunk into the Legacy16 code after it had | |
| been shadowed. | |
| @param Private Legacy BIOS context data | |
| @retval EFI_SUCCESS Legacy16 code loaded | |
| @retval Other No protocol installed, unload driver. | |
| **/ | |
| EFI_STATUS | |
| ShadowAndStartLegacy16 ( | |
| IN LEGACY_BIOS_INSTANCE *Private | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| UINT8 *Ptr; | |
| UINT8 *PtrEnd; | |
| BOOLEAN Done; | |
| EFI_COMPATIBILITY16_TABLE *Table; | |
| UINT8 CheckSum; | |
| EFI_IA32_REGISTER_SET Regs; | |
| EFI_TO_COMPATIBILITY16_INIT_TABLE *EfiToLegacy16InitTable; | |
| EFI_TO_COMPATIBILITY16_BOOT_TABLE *EfiToLegacy16BootTable; | |
| VOID *LegacyBiosImage; | |
| UINTN LegacyBiosImageSize; | |
| UINTN E820Size; | |
| UINT32 *ClearPtr; | |
| BBS_TABLE *BbsTable; | |
| LEGACY_EFI_HDD_TABLE *LegacyEfiHddTable; | |
| UINTN Index; | |
| UINT32 TpmPointer; | |
| VOID *TpmBinaryImage; | |
| UINTN TpmBinaryImageSize; | |
| UINTN Location; | |
| UINTN Alignment; | |
| UINTN TempData; | |
| EFI_PHYSICAL_ADDRESS Address; | |
| UINT16 OldMask; | |
| UINT16 NewMask; | |
| UINT32 Granularity; | |
| EFI_GCD_MEMORY_SPACE_DESCRIPTOR Descriptor; | |
| Location = 0; | |
| Alignment = 0; | |
| // | |
| // we allocate the C/D/E/F segment as RT code so no one will use it any more. | |
| // | |
| Address = 0xC0000; | |
| gDS->GetMemorySpaceDescriptor (Address, &Descriptor); | |
| if (Descriptor.GcdMemoryType == EfiGcdMemoryTypeSystemMemory) { | |
| // | |
| // If it is already reserved, we should be safe, or else we allocate it. | |
| // | |
| Status = gBS->AllocatePages ( | |
| AllocateAddress, | |
| EfiRuntimeServicesCode, | |
| 0x40000/EFI_PAGE_SIZE, | |
| &Address | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| // | |
| // Bugbug: need to figure out whether C/D/E/F segment should be marked as reserved memory. | |
| // | |
| DEBUG ((DEBUG_ERROR, "Failed to allocate the C/D/E/F segment Status = %r", Status)); | |
| } | |
| } | |
| // | |
| // start testtest | |
| // GetTimerValue (&Ticker); | |
| // | |
| // gRT->SetVariable (L"StartLegacy", | |
| // &gEfiGlobalVariableGuid, | |
| // EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, | |
| // sizeof (UINT64), | |
| // (VOID *)&Ticker | |
| // ); | |
| // end testtest | |
| // | |
| EfiToLegacy16BootTable = &Private->IntThunk->EfiToLegacy16BootTable; | |
| Status = Private->LegacyBiosPlatform->GetPlatformInfo ( | |
| Private->LegacyBiosPlatform, | |
| EfiGetPlatformBinarySystemRom, | |
| &LegacyBiosImage, | |
| &LegacyBiosImageSize, | |
| &Location, | |
| &Alignment, | |
| 0, | |
| 0 | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| return Status; | |
| } | |
| Private->BiosStart = (UINT32)(0x100000 - LegacyBiosImageSize); | |
| Private->OptionRom = 0xc0000; | |
| Private->LegacyBiosImageSize = (UINT32)LegacyBiosImageSize; | |
| // | |
| // Can only shadow into memory allocated for legacy usage. | |
| // | |
| ASSERT (Private->BiosStart > Private->OptionRom); | |
| // | |
| // Shadow Legacy BIOS. Turn on memory and copy image | |
| // | |
| Private->LegacyRegion->UnLock (Private->LegacyRegion, 0xc0000, 0x40000, &Granularity); | |
| ClearPtr = (VOID *)((UINTN)0xc0000); | |
| // | |
| // Initialize region from 0xc0000 to start of BIOS to all ffs. This allows unused | |
| // regions to be used by EMM386 etc. | |
| // | |
| SetMem ((VOID *)ClearPtr, (UINTN)(0x40000 - LegacyBiosImageSize), 0xff); | |
| TempData = Private->BiosStart; | |
| CopyMem ( | |
| (VOID *)TempData, | |
| LegacyBiosImage, | |
| (UINTN)LegacyBiosImageSize | |
| ); | |
| Private->Cpu->FlushDataCache (Private->Cpu, 0xc0000, 0x40000, EfiCpuFlushTypeWriteBackInvalidate); | |
| // | |
| // Search for Legacy16 table in Shadowed ROM | |
| // | |
| Done = FALSE; | |
| Table = NULL; | |
| for (Ptr = (UINT8 *)TempData; Ptr < (UINT8 *)((UINTN)0x100000) && !Done; Ptr += 0x10) { | |
| if (*(UINT32 *)Ptr == SIGNATURE_32 ('I', 'F', 'E', '$')) { | |
| Table = (EFI_COMPATIBILITY16_TABLE *)Ptr; | |
| PtrEnd = Ptr + Table->TableLength; | |
| for (CheckSum = 0; Ptr < PtrEnd; Ptr++) { | |
| CheckSum = (UINT8)(CheckSum +*Ptr); | |
| } | |
| Done = TRUE; | |
| } | |
| } | |
| if (Table == NULL) { | |
| DEBUG ((DEBUG_ERROR, "No Legacy16 table found\n")); | |
| return EFI_NOT_FOUND; | |
| } | |
| if (!Done) { | |
| // | |
| // Legacy16 table header checksum error. | |
| // | |
| DEBUG ((DEBUG_ERROR, "Legacy16 table found with bad talbe header checksum\n")); | |
| } | |
| // | |
| // Remember location of the Legacy16 table | |
| // | |
| Private->Legacy16Table = Table; | |
| Private->Legacy16CallSegment = Table->Compatibility16CallSegment; | |
| Private->Legacy16CallOffset = Table->Compatibility16CallOffset; | |
| EfiToLegacy16InitTable = &Private->IntThunk->EfiToLegacy16InitTable; | |
| Private->Legacy16InitPtr = EfiToLegacy16InitTable; | |
| Private->Legacy16BootPtr = &Private->IntThunk->EfiToLegacy16BootTable; | |
| Private->InternalIrqRoutingTable = NULL; | |
| Private->NumberIrqRoutingEntries = 0; | |
| Private->BbsTablePtr = NULL; | |
| Private->LegacyEfiHddTable = NULL; | |
| Private->DiskEnd = 0; | |
| Private->Disk4075 = 0; | |
| Private->HddTablePtr = &Private->IntThunk->EfiToLegacy16BootTable.HddInfo; | |
| Private->NumberHddControllers = MAX_IDE_CONTROLLER; | |
| Private->Dump[0] = 'D'; | |
| Private->Dump[1] = 'U'; | |
| Private->Dump[2] = 'M'; | |
| Private->Dump[3] = 'P'; | |
| ZeroMem ( | |
| Private->Legacy16BootPtr, | |
| sizeof (EFI_TO_COMPATIBILITY16_BOOT_TABLE) | |
| ); | |
| // | |
| // Store away a copy of the EFI System Table | |
| // | |
| Table->EfiSystemTable = (UINT32)(UINTN)gST; | |
| // | |
| // IPF CSM integration -Bug | |
| // | |
| // Construct the Legacy16 boot memory map. This sets up number of | |
| // E820 entries. | |
| // | |
| LegacyBiosBuildE820 (Private, &E820Size); | |
| // | |
| // Initialize BDA and EBDA standard values needed to load Legacy16 code | |
| // | |
| LegacyBiosInitBda (Private); | |
| LegacyBiosInitCmos (Private); | |
| // | |
| // All legacy interrupt should be masked when do initialization work from legacy 16 code. | |
| // | |
| Private->Legacy8259->GetMask (Private->Legacy8259, &OldMask, NULL, NULL, NULL); | |
| NewMask = 0xFFFF; | |
| Private->Legacy8259->SetMask (Private->Legacy8259, &NewMask, NULL, NULL, NULL); | |
| // | |
| // Call into Legacy16 code to do an INIT | |
| // | |
| ZeroMem (&Regs, sizeof (EFI_IA32_REGISTER_SET)); | |
| Regs.X.AX = Legacy16InitializeYourself; | |
| Regs.X.ES = EFI_SEGMENT (*((UINT32 *)&EfiToLegacy16InitTable)); | |
| Regs.X.BX = EFI_OFFSET (*((UINT32 *)&EfiToLegacy16InitTable)); | |
| Private->LegacyBios.FarCall86 ( | |
| &Private->LegacyBios, | |
| Table->Compatibility16CallSegment, | |
| Table->Compatibility16CallOffset, | |
| &Regs, | |
| NULL, | |
| 0 | |
| ); | |
| // | |
| // Restore original legacy interrupt mask value | |
| // | |
| Private->Legacy8259->SetMask (Private->Legacy8259, &OldMask, NULL, NULL, NULL); | |
| if (Regs.X.AX != 0) { | |
| return EFI_DEVICE_ERROR; | |
| } | |
| // | |
| // start testtest | |
| // GetTimerValue (&Ticker); | |
| // | |
| // gRT->SetVariable (L"BackFromInitYourself", | |
| // &gEfiGlobalVariableGuid, | |
| // EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, | |
| // sizeof (UINT64), | |
| // (VOID *)&Ticker | |
| // ); | |
| // end testtest | |
| // | |
| // Copy E820 table after InitializeYourself is completed | |
| // | |
| ZeroMem (&Regs, sizeof (EFI_IA32_REGISTER_SET)); | |
| Regs.X.AX = Legacy16GetTableAddress; | |
| Regs.X.CX = (UINT16)E820Size; | |
| Regs.X.DX = 1; | |
| Private->LegacyBios.FarCall86 ( | |
| &Private->LegacyBios, | |
| Table->Compatibility16CallSegment, | |
| Table->Compatibility16CallOffset, | |
| &Regs, | |
| NULL, | |
| 0 | |
| ); | |
| Table->E820Pointer = (UINT32)(Regs.X.DS * 16 + Regs.X.BX); | |
| Table->E820Length = (UINT32)E820Size; | |
| if (Regs.X.AX != 0) { | |
| DEBUG ((DEBUG_ERROR, "Legacy16 E820 length insufficient\n")); | |
| } else { | |
| TempData = Table->E820Pointer; | |
| CopyMem ((VOID *)TempData, Private->E820Table, E820Size); | |
| } | |
| // | |
| // Get PnPInstallationCheck Info. | |
| // | |
| Private->PnPInstallationCheckSegment = Table->PnPInstallationCheckSegment; | |
| Private->PnPInstallationCheckOffset = Table->PnPInstallationCheckOffset; | |
| // | |
| // Check if PCI Express is supported. If yes, Save base address. | |
| // | |
| Status = Private->LegacyBiosPlatform->GetPlatformInfo ( | |
| Private->LegacyBiosPlatform, | |
| EfiGetPlatformPciExpressBase, | |
| NULL, | |
| NULL, | |
| &Location, | |
| &Alignment, | |
| 0, | |
| 0 | |
| ); | |
| if (!EFI_ERROR (Status)) { | |
| Private->Legacy16Table->PciExpressBase = (UINT32)Location; | |
| Location = 0; | |
| } | |
| // | |
| // Check if TPM is supported. If yes get a region in E0000,F0000 to copy it | |
| // into, copy it and update pointer to binary image. This needs to be | |
| // done prior to any OPROM for security purposes. | |
| // | |
| Status = Private->LegacyBiosPlatform->GetPlatformInfo ( | |
| Private->LegacyBiosPlatform, | |
| EfiGetPlatformBinaryTpmBinary, | |
| &TpmBinaryImage, | |
| &TpmBinaryImageSize, | |
| &Location, | |
| &Alignment, | |
| 0, | |
| 0 | |
| ); | |
| if (!EFI_ERROR (Status)) { | |
| ZeroMem (&Regs, sizeof (EFI_IA32_REGISTER_SET)); | |
| Regs.X.AX = Legacy16GetTableAddress; | |
| Regs.X.CX = (UINT16)TpmBinaryImageSize; | |
| Regs.X.DX = 1; | |
| Private->LegacyBios.FarCall86 ( | |
| &Private->LegacyBios, | |
| Table->Compatibility16CallSegment, | |
| Table->Compatibility16CallOffset, | |
| &Regs, | |
| NULL, | |
| 0 | |
| ); | |
| TpmPointer = (UINT32)(Regs.X.DS * 16 + Regs.X.BX); | |
| if (Regs.X.AX != 0) { | |
| DEBUG ((DEBUG_ERROR, "TPM cannot be loaded\n")); | |
| } else { | |
| CopyMem ((VOID *)(UINTN)TpmPointer, TpmBinaryImage, TpmBinaryImageSize); | |
| Table->TpmSegment = Regs.X.DS; | |
| Table->TpmOffset = Regs.X.BX; | |
| } | |
| } | |
| // | |
| // Lock the Legacy BIOS region | |
| // | |
| Private->Cpu->FlushDataCache (Private->Cpu, Private->BiosStart, (UINT32)LegacyBiosImageSize, EfiCpuFlushTypeWriteBackInvalidate); | |
| Private->LegacyRegion->Lock (Private->LegacyRegion, Private->BiosStart, (UINT32)LegacyBiosImageSize, &Granularity); | |
| // | |
| // Get the BbsTable from LOW_MEMORY_THUNK | |
| // | |
| BbsTable = (BBS_TABLE *)(UINTN)Private->IntThunk->BbsTable; | |
| ZeroMem ((VOID *)BbsTable, sizeof (Private->IntThunk->BbsTable)); | |
| EfiToLegacy16BootTable->BbsTable = (UINT32)(UINTN)BbsTable; | |
| Private->BbsTablePtr = (VOID *)BbsTable; | |
| // | |
| // Populate entire table with BBS_IGNORE_ENTRY | |
| // | |
| EfiToLegacy16BootTable->NumberBbsEntries = MAX_BBS_ENTRIES; | |
| for (Index = 0; Index < MAX_BBS_ENTRIES; Index++) { | |
| BbsTable[Index].BootPriority = BBS_IGNORE_ENTRY; | |
| } | |
| // | |
| // Allocate space for Legacy HDD table | |
| // | |
| LegacyEfiHddTable = (LEGACY_EFI_HDD_TABLE *)AllocateZeroPool ((UINTN)MAX_HDD_ENTRIES * sizeof (LEGACY_EFI_HDD_TABLE)); | |
| ASSERT (LegacyEfiHddTable); | |
| Private->LegacyEfiHddTable = LegacyEfiHddTable; | |
| Private->LegacyEfiHddTableIndex = 0x00; | |
| // | |
| // start testtest | |
| // GetTimerValue (&Ticker); | |
| // | |
| // gRT->SetVariable (L"EndOfLoadFv", | |
| // &gEfiGlobalVariableGuid, | |
| // EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS, | |
| // sizeof (UINT64), | |
| // (VOID *)&Ticker | |
| // ); | |
| // end testtest | |
| // | |
| return EFI_SUCCESS; | |
| } | |
| /** | |
| Shadow all legacy16 OPROMs that haven't been shadowed. | |
| Warning: Use this with caution. This routine disconnects all EFI | |
| drivers. If used externally then caller must re-connect EFI | |
| drivers. | |
| @param This Protocol instance pointer. | |
| @retval EFI_SUCCESS OPROMs shadowed | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| LegacyBiosShadowAllLegacyOproms ( | |
| IN EFI_LEGACY_BIOS_PROTOCOL *This | |
| ) | |
| { | |
| LEGACY_BIOS_INSTANCE *Private; | |
| // | |
| // EFI_LEGACY_BIOS_PLATFORM_PROTOCOL *LegacyBiosPlatform; | |
| // EFI_LEGACY16_TABLE *Legacy16Table; | |
| // | |
| Private = LEGACY_BIOS_INSTANCE_FROM_THIS (This); | |
| // | |
| // LegacyBiosPlatform = Private->LegacyBiosPlatform; | |
| // Legacy16Table = Private->Legacy16Table; | |
| // | |
| // Shadow PCI ROMs. We must do this near the end since this will kick | |
| // of Native EFI drivers that may be needed to collect info for Legacy16 | |
| // | |
| // WARNING: PciIo is gone after this call. | |
| // | |
| PciProgramAllInterruptLineRegisters (Private); | |
| PciShadowRoms (Private); | |
| // | |
| // Shadow PXE base code, BIS etc. | |
| // | |
| // LegacyBiosPlatform->ShadowServiceRoms (LegacyBiosPlatform, | |
| // &Private->OptionRom, | |
| // Legacy16Table); | |
| // | |
| return EFI_SUCCESS; | |
| } | |
| /** | |
| Get the PCI BIOS interface version. | |
| @param Private Driver private data. | |
| @return The PCI interface version number in Binary Coded Decimal (BCD) format. | |
| E.g.: 0x0210 indicates 2.10, 0x0300 indicates 3.00 | |
| **/ | |
| UINT16 | |
| GetPciInterfaceVersion ( | |
| IN LEGACY_BIOS_INSTANCE *Private | |
| ) | |
| { | |
| EFI_IA32_REGISTER_SET Reg; | |
| BOOLEAN ThunkFailed; | |
| UINT16 PciInterfaceVersion; | |
| PciInterfaceVersion = 0; | |
| Reg.X.AX = 0xB101; | |
| Reg.E.EDI = 0; | |
| ThunkFailed = Private->LegacyBios.Int86 (&Private->LegacyBios, 0x1A, &Reg); | |
| if (!ThunkFailed) { | |
| // | |
| // From PCI Firmware 3.0 Specification: | |
| // If the CARRY FLAG [CF] is cleared and AH is set to 00h, it is still necessary to examine the | |
| // contents of [EDX] for the presence of the string "PCI" + (trailing space) to fully validate the | |
| // presence of the PCI function set. [BX] will further indicate the version level, with enough | |
| // granularity to allow for incremental changes in the code that don't affect the function interface. | |
| // Version numbers are stored as Binary Coded Decimal (BCD) values. For example, Version 2.10 | |
| // would be returned as a 02h in the [BH] registers and 10h in the [BL] registers. | |
| // | |
| if ((Reg.X.Flags.CF == 0) && (Reg.H.AH == 0) && (Reg.E.EDX == SIGNATURE_32 ('P', 'C', 'I', ' '))) { | |
| PciInterfaceVersion = Reg.X.BX; | |
| } | |
| } | |
| return PciInterfaceVersion; | |
| } | |
| /** | |
| Callback function to calculate SMBIOS table size, and allocate memory for SMBIOS table. | |
| SMBIOS table will be copied into EfiReservedMemoryType memory in legacy boot path. | |
| @param Event Event whose notification function is being invoked. | |
| @param Context The pointer to the notification function's context, | |
| which is implementation-dependent. | |
| **/ | |
| VOID | |
| EFIAPI | |
| InstallSmbiosEventCallback ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| SMBIOS_TABLE_ENTRY_POINT *EntryPointStructure; | |
| // | |
| // Get SMBIOS table from EFI configuration table | |
| // | |
| Status = EfiGetSystemConfigurationTable ( | |
| &gEfiSmbiosTableGuid, | |
| &mRuntimeSmbiosEntryPoint | |
| ); | |
| if ((EFI_ERROR (Status)) || (mRuntimeSmbiosEntryPoint == NULL)) { | |
| return; | |
| } | |
| EntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *)mRuntimeSmbiosEntryPoint; | |
| // | |
| // Allocate memory for SMBIOS Entry Point Structure. | |
| // CSM framework spec requires SMBIOS table below 4GB in EFI_TO_COMPATIBILITY16_BOOT_TABLE. | |
| // | |
| if (mReserveSmbiosEntryPoint == 0) { | |
| // | |
| // Entrypoint structure with fixed size is allocated only once. | |
| // | |
| mReserveSmbiosEntryPoint = SIZE_4GB - 1; | |
| Status = gBS->AllocatePages ( | |
| AllocateMaxAddress, | |
| EfiReservedMemoryType, | |
| EFI_SIZE_TO_PAGES ((UINTN)(EntryPointStructure->EntryPointLength)), | |
| &mReserveSmbiosEntryPoint | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| mReserveSmbiosEntryPoint = 0; | |
| return; | |
| } | |
| DEBUG ((DEBUG_INFO, "Allocate memory for Smbios Entry Point Structure\n")); | |
| } | |
| if ((mStructureTableAddress != 0) && | |
| (mStructureTablePages < EFI_SIZE_TO_PAGES ((UINT32)EntryPointStructure->TableLength))) | |
| { | |
| // | |
| // If original buffer is not enough for the new SMBIOS table, free original buffer and re-allocate | |
| // | |
| gBS->FreePages (mStructureTableAddress, mStructureTablePages); | |
| mStructureTableAddress = 0; | |
| mStructureTablePages = 0; | |
| DEBUG ((DEBUG_INFO, "Original size is not enough. Re-allocate the memory.\n")); | |
| } | |
| if (mStructureTableAddress == 0) { | |
| // | |
| // Allocate reserved memory below 4GB. | |
| // Smbios spec requires the structure table is below 4GB. | |
| // | |
| mStructureTableAddress = SIZE_4GB - 1; | |
| mStructureTablePages = EFI_SIZE_TO_PAGES (EntryPointStructure->TableLength); | |
| Status = gBS->AllocatePages ( | |
| AllocateMaxAddress, | |
| EfiReservedMemoryType, | |
| mStructureTablePages, | |
| &mStructureTableAddress | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| gBS->FreePages ( | |
| mReserveSmbiosEntryPoint, | |
| EFI_SIZE_TO_PAGES ((UINTN)(EntryPointStructure->EntryPointLength)) | |
| ); | |
| mReserveSmbiosEntryPoint = 0; | |
| mStructureTableAddress = 0; | |
| mStructureTablePages = 0; | |
| return; | |
| } | |
| DEBUG ((DEBUG_INFO, "Allocate memory for Smbios Structure Table\n")); | |
| } | |
| } | |
| /** | |
| Callback function to toggle EndOfDxe status. NULL pointer detection needs | |
| this status to decide if it's necessary to change attributes of page 0. | |
| @param Event Event whose notification function is being invoked. | |
| @param Context The pointer to the notification function's context, | |
| which is implementation-dependent. | |
| **/ | |
| VOID | |
| EFIAPI | |
| ToggleEndOfDxeStatus ( | |
| IN EFI_EVENT Event, | |
| IN VOID *Context | |
| ) | |
| { | |
| mEndOfDxe = TRUE; | |
| return; | |
| } | |
| /** | |
| Install Driver to produce Legacy BIOS protocol. | |
| @param ImageHandle Handle of driver image. | |
| @param SystemTable Pointer to system table. | |
| @retval EFI_SUCCESS Legacy BIOS protocol installed | |
| @retval No protocol installed, unload driver. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| LegacyBiosInstall ( | |
| IN EFI_HANDLE ImageHandle, | |
| IN EFI_SYSTEM_TABLE *SystemTable | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| LEGACY_BIOS_INSTANCE *Private; | |
| EFI_TO_COMPATIBILITY16_INIT_TABLE *EfiToLegacy16InitTable; | |
| EFI_PHYSICAL_ADDRESS MemoryAddress; | |
| EFI_PHYSICAL_ADDRESS EbdaReservedBaseAddress; | |
| VOID *MemoryPtr; | |
| EFI_PHYSICAL_ADDRESS MemoryAddressUnder1MB; | |
| UINTN Index; | |
| UINT32 *BaseVectorMaster; | |
| EFI_PHYSICAL_ADDRESS StartAddress; | |
| UINT32 *ClearPtr; | |
| EFI_PHYSICAL_ADDRESS MemStart; | |
| UINT32 IntRedirCode; | |
| UINT32 Granularity; | |
| BOOLEAN DecodeOn; | |
| UINT32 MemorySize; | |
| EFI_GCD_MEMORY_SPACE_DESCRIPTOR Descriptor; | |
| UINT64 Length; | |
| UINT8 *SecureBoot; | |
| EFI_EVENT InstallSmbiosEvent; | |
| EFI_EVENT EndOfDxeEvent; | |
| // | |
| // Load this driver's image to memory | |
| // | |
| Status = RelocateImageUnder4GIfNeeded (ImageHandle, SystemTable); | |
| if (EFI_ERROR (Status)) { | |
| return Status; | |
| } | |
| // | |
| // When UEFI Secure Boot is enabled, CSM module will not start any more. | |
| // | |
| SecureBoot = NULL; | |
| GetEfiGlobalVariable2 (EFI_SECURE_BOOT_MODE_NAME, (VOID **)&SecureBoot, NULL); | |
| if ((SecureBoot != NULL) && (*SecureBoot == SECURE_BOOT_MODE_ENABLE)) { | |
| FreePool (SecureBoot); | |
| return EFI_SECURITY_VIOLATION; | |
| } | |
| if (SecureBoot != NULL) { | |
| FreePool (SecureBoot); | |
| } | |
| Private = &mPrivateData; | |
| ZeroMem (Private, sizeof (LEGACY_BIOS_INSTANCE)); | |
| // | |
| // Grab a copy of all the protocols we depend on. Any error would | |
| // be a dispatcher bug!. | |
| // | |
| Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&Private->Cpu); | |
| ASSERT_EFI_ERROR (Status); | |
| Status = gBS->LocateProtocol (&gEfiTimerArchProtocolGuid, NULL, (VOID **)&Private->Timer); | |
| ASSERT_EFI_ERROR (Status); | |
| Status = gBS->LocateProtocol (&gEfiLegacyRegion2ProtocolGuid, NULL, (VOID **)&Private->LegacyRegion); | |
| ASSERT_EFI_ERROR (Status); | |
| Status = gBS->LocateProtocol (&gEfiLegacyBiosPlatformProtocolGuid, NULL, (VOID **)&Private->LegacyBiosPlatform); | |
| ASSERT_EFI_ERROR (Status); | |
| Status = gBS->LocateProtocol (&gEfiLegacy8259ProtocolGuid, NULL, (VOID **)&Private->Legacy8259); | |
| ASSERT_EFI_ERROR (Status); | |
| Status = gBS->LocateProtocol (&gEfiLegacyInterruptProtocolGuid, NULL, (VOID **)&Private->LegacyInterrupt); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Locate Memory Test Protocol if exists | |
| // | |
| Status = gBS->LocateProtocol ( | |
| &gEfiGenericMemTestProtocolGuid, | |
| NULL, | |
| (VOID **)&Private->GenericMemoryTest | |
| ); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Make sure all memory from 0-640K is tested | |
| // | |
| for (StartAddress = 0; StartAddress < 0xa0000; ) { | |
| gDS->GetMemorySpaceDescriptor (StartAddress, &Descriptor); | |
| if (Descriptor.GcdMemoryType != EfiGcdMemoryTypeReserved) { | |
| StartAddress = Descriptor.BaseAddress + Descriptor.Length; | |
| continue; | |
| } | |
| Length = MIN (Descriptor.Length, 0xa0000 - StartAddress); | |
| Private->GenericMemoryTest->CompatibleRangeTest ( | |
| Private->GenericMemoryTest, | |
| StartAddress, | |
| Length | |
| ); | |
| StartAddress = StartAddress + Length; | |
| } | |
| // | |
| // Make sure all memory from 1MB to 16MB is tested and added to memory map | |
| // | |
| for (StartAddress = BASE_1MB; StartAddress < BASE_16MB; ) { | |
| gDS->GetMemorySpaceDescriptor (StartAddress, &Descriptor); | |
| if (Descriptor.GcdMemoryType != EfiGcdMemoryTypeReserved) { | |
| StartAddress = Descriptor.BaseAddress + Descriptor.Length; | |
| continue; | |
| } | |
| Length = MIN (Descriptor.Length, BASE_16MB - StartAddress); | |
| Private->GenericMemoryTest->CompatibleRangeTest ( | |
| Private->GenericMemoryTest, | |
| StartAddress, | |
| Length | |
| ); | |
| StartAddress = StartAddress + Length; | |
| } | |
| Private->Signature = LEGACY_BIOS_INSTANCE_SIGNATURE; | |
| Private->LegacyBios.Int86 = LegacyBiosInt86; | |
| Private->LegacyBios.FarCall86 = LegacyBiosFarCall86; | |
| Private->LegacyBios.CheckPciRom = LegacyBiosCheckPciRom; | |
| Private->LegacyBios.InstallPciRom = LegacyBiosInstallPciRom; | |
| Private->LegacyBios.LegacyBoot = LegacyBiosLegacyBoot; | |
| Private->LegacyBios.UpdateKeyboardLedStatus = LegacyBiosUpdateKeyboardLedStatus; | |
| Private->LegacyBios.GetBbsInfo = LegacyBiosGetBbsInfo; | |
| Private->LegacyBios.ShadowAllLegacyOproms = LegacyBiosShadowAllLegacyOproms; | |
| Private->LegacyBios.PrepareToBootEfi = LegacyBiosPrepareToBootEfi; | |
| Private->LegacyBios.GetLegacyRegion = LegacyBiosGetLegacyRegion; | |
| Private->LegacyBios.CopyLegacyRegion = LegacyBiosCopyLegacyRegion; | |
| Private->LegacyBios.BootUnconventionalDevice = LegacyBiosBootUnconventionalDevice; | |
| Private->ImageHandle = ImageHandle; | |
| // | |
| // Enable read attribute of legacy region. | |
| // | |
| DecodeOn = TRUE; | |
| Private->LegacyRegion->Decode ( | |
| Private->LegacyRegion, | |
| 0xc0000, | |
| 0x40000, | |
| &Granularity, | |
| &DecodeOn | |
| ); | |
| // | |
| // Set Cachebility for legacy region | |
| // BUGBUG: Comments about this legacy region cacheability setting | |
| // This setting will make D865GCHProduction CSM Unhappy | |
| // | |
| if (PcdGetBool (PcdLegacyBiosCacheLegacyRegion)) { | |
| gDS->SetMemorySpaceAttributes ( | |
| 0x0, | |
| 0xA0000, | |
| EFI_MEMORY_WB | |
| ); | |
| gDS->SetMemorySpaceAttributes ( | |
| 0xc0000, | |
| 0x40000, | |
| EFI_MEMORY_WB | |
| ); | |
| } | |
| gDS->SetMemorySpaceAttributes ( | |
| 0xA0000, | |
| 0x20000, | |
| EFI_MEMORY_UC | |
| ); | |
| // | |
| // Allocate 0 - 4K for real mode interrupt vectors and BDA. | |
| // | |
| AllocateLegacyMemory ( | |
| AllocateAddress, | |
| EfiReservedMemoryType, | |
| 0, | |
| 1, | |
| &MemoryAddress | |
| ); | |
| ASSERT (MemoryAddress == 0x000000000); | |
| ClearPtr = (VOID *)((UINTN)0x0000); | |
| // | |
| // Initialize region from 0x0000 to 4k. This initializes interrupt vector | |
| // range. | |
| // | |
| ACCESS_PAGE0_CODE ( | |
| gBS->SetMem ((VOID *)ClearPtr, 0x400, INITIAL_VALUE_BELOW_1K); | |
| ZeroMem ((VOID *)((UINTN)ClearPtr + 0x400), 0xC00); | |
| ); | |
| // | |
| // Allocate pages for OPROM usage | |
| // | |
| MemorySize = PcdGet32 (PcdEbdaReservedMemorySize); | |
| ASSERT ((MemorySize & 0xFFF) == 0); | |
| Status = AllocateLegacyMemory ( | |
| AllocateAddress, | |
| EfiReservedMemoryType, | |
| CONVENTIONAL_MEMORY_TOP - MemorySize, | |
| EFI_SIZE_TO_PAGES (MemorySize), | |
| &MemoryAddress | |
| ); | |
| ASSERT_EFI_ERROR (Status); | |
| ZeroMem ((VOID *)((UINTN)MemoryAddress), MemorySize); | |
| // | |
| // Allocate all 32k chunks from 0x60000 ~ 0x88000 for Legacy OPROMs that | |
| // don't use PMM but look for zeroed memory. Note that various non-BBS | |
| // OpROMs expect different areas to be free | |
| // | |
| EbdaReservedBaseAddress = MemoryAddress; | |
| MemoryAddress = PcdGet32 (PcdOpromReservedMemoryBase); | |
| MemorySize = PcdGet32 (PcdOpromReservedMemorySize); | |
| // | |
| // Check if base address and size for reserved memory are 4KB aligned. | |
| // | |
| ASSERT ((MemoryAddress & 0xFFF) == 0); | |
| ASSERT ((MemorySize & 0xFFF) == 0); | |
| // | |
| // Check if the reserved memory is below EBDA reserved range. | |
| // | |
| ASSERT ((MemoryAddress < EbdaReservedBaseAddress) && ((MemoryAddress + MemorySize - 1) < EbdaReservedBaseAddress)); | |
| for (MemStart = MemoryAddress; MemStart < MemoryAddress + MemorySize; MemStart += 0x1000) { | |
| Status = AllocateLegacyMemory ( | |
| AllocateAddress, | |
| EfiBootServicesCode, | |
| MemStart, | |
| 1, | |
| &StartAddress | |
| ); | |
| if (!EFI_ERROR (Status)) { | |
| MemoryPtr = (VOID *)((UINTN)StartAddress); | |
| ZeroMem (MemoryPtr, 0x1000); | |
| } else { | |
| DEBUG ((DEBUG_ERROR, "WARNING: Allocate legacy memory fail for SCSI card - %x\n", MemStart)); | |
| } | |
| } | |
| // | |
| // Allocate low PMM memory and zero it out | |
| // | |
| MemorySize = PcdGet32 (PcdLowPmmMemorySize); | |
| ASSERT ((MemorySize & 0xFFF) == 0); | |
| Status = AllocateLegacyMemory ( | |
| AllocateMaxAddress, | |
| EfiBootServicesCode, | |
| CONVENTIONAL_MEMORY_TOP, | |
| EFI_SIZE_TO_PAGES (MemorySize), | |
| &MemoryAddressUnder1MB | |
| ); | |
| ASSERT_EFI_ERROR (Status); | |
| ZeroMem ((VOID *)((UINTN)MemoryAddressUnder1MB), MemorySize); | |
| // | |
| // Allocate space for thunker and Init Thunker | |
| // | |
| Status = AllocateLegacyMemory ( | |
| AllocateMaxAddress, | |
| EfiReservedMemoryType, | |
| CONVENTIONAL_MEMORY_TOP, | |
| (sizeof (LOW_MEMORY_THUNK) / EFI_PAGE_SIZE) + 2, | |
| &MemoryAddress | |
| ); | |
| ASSERT_EFI_ERROR (Status); | |
| Private->IntThunk = (LOW_MEMORY_THUNK *)(UINTN)MemoryAddress; | |
| EfiToLegacy16InitTable = &Private->IntThunk->EfiToLegacy16InitTable; | |
| EfiToLegacy16InitTable->ThunkStart = (UINT32)(EFI_PHYSICAL_ADDRESS)(UINTN)MemoryAddress; | |
| EfiToLegacy16InitTable->ThunkSizeInBytes = (UINT32)(sizeof (LOW_MEMORY_THUNK)); | |
| Status = LegacyBiosInitializeThunk (Private); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Init the legacy memory map in memory < 1 MB. | |
| // | |
| EfiToLegacy16InitTable->BiosLessThan1MB = (UINT32)MemoryAddressUnder1MB; | |
| EfiToLegacy16InitTable->LowPmmMemory = (UINT32)MemoryAddressUnder1MB; | |
| EfiToLegacy16InitTable->LowPmmMemorySizeInBytes = MemorySize; | |
| MemorySize = PcdGet32 (PcdHighPmmMemorySize); | |
| ASSERT ((MemorySize & 0xFFF) == 0); | |
| // | |
| // Allocate high PMM Memory under 16 MB | |
| // | |
| Status = AllocateLegacyMemory ( | |
| AllocateMaxAddress, | |
| EfiBootServicesCode, | |
| 0x1000000, | |
| EFI_SIZE_TO_PAGES (MemorySize), | |
| &MemoryAddress | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| // | |
| // If it fails, allocate high PMM Memory under 4GB | |
| // | |
| Status = AllocateLegacyMemory ( | |
| AllocateMaxAddress, | |
| EfiBootServicesCode, | |
| 0xFFFFFFFF, | |
| EFI_SIZE_TO_PAGES (MemorySize), | |
| &MemoryAddress | |
| ); | |
| } | |
| if (!EFI_ERROR (Status)) { | |
| EfiToLegacy16InitTable->HiPmmMemory = (UINT32)(EFI_PHYSICAL_ADDRESS)(UINTN)MemoryAddress; | |
| EfiToLegacy16InitTable->HiPmmMemorySizeInBytes = MemorySize; | |
| } | |
| // | |
| // ShutdownAPs(); | |
| // | |
| // Start the Legacy BIOS; | |
| // | |
| Status = ShadowAndStartLegacy16 (Private); | |
| if (EFI_ERROR (Status)) { | |
| return Status; | |
| } | |
| // | |
| // Initialize interrupt redirection code and entries; | |
| // IDT Vectors 0x68-0x6f must be redirected to IDT Vectors 0x08-0x0f. | |
| // | |
| CopyMem ( | |
| Private->IntThunk->InterruptRedirectionCode, | |
| (VOID *)(UINTN)InterruptRedirectionTemplate, | |
| sizeof (Private->IntThunk->InterruptRedirectionCode) | |
| ); | |
| // | |
| // Save Unexpected interrupt vector so can restore it just prior to boot | |
| // | |
| ACCESS_PAGE0_CODE ( | |
| BaseVectorMaster = (UINT32 *)(sizeof (UINT32) * PROTECTED_MODE_BASE_VECTOR_MASTER); | |
| Private->BiosUnexpectedInt = BaseVectorMaster[0]; | |
| IntRedirCode = (UINT32)(UINTN)Private->IntThunk->InterruptRedirectionCode; | |
| for (Index = 0; Index < 8; Index++) { | |
| BaseVectorMaster[Index] = (EFI_SEGMENT (IntRedirCode + Index * 4) << 16) | EFI_OFFSET (IntRedirCode + Index * 4); | |
| } | |
| ); | |
| // | |
| // Save EFI value | |
| // | |
| Private->ThunkSeg = (UINT16)(EFI_SEGMENT (IntRedirCode)); | |
| // | |
| // Allocate reserved memory for SMBIOS table used in legacy boot if SMBIOS table exists | |
| // | |
| InstallSmbiosEventCallback (NULL, NULL); | |
| // | |
| // Create callback function to update the size of reserved memory after LegacyBiosDxe starts | |
| // | |
| Status = gBS->CreateEventEx ( | |
| EVT_NOTIFY_SIGNAL, | |
| TPL_NOTIFY, | |
| InstallSmbiosEventCallback, | |
| NULL, | |
| &gEfiSmbiosTableGuid, | |
| &InstallSmbiosEvent | |
| ); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Create callback to update status of EndOfDxe, which is needed by NULL | |
| // pointer detection | |
| // | |
| Status = gBS->CreateEventEx ( | |
| EVT_NOTIFY_SIGNAL, | |
| TPL_NOTIFY, | |
| ToggleEndOfDxeStatus, | |
| NULL, | |
| &gEfiEndOfDxeEventGroupGuid, | |
| &EndOfDxeEvent | |
| ); | |
| ASSERT_EFI_ERROR (Status); | |
| // | |
| // Make a new handle and install the protocol | |
| // | |
| Private->Handle = NULL; | |
| Status = gBS->InstallProtocolInterface ( | |
| &Private->Handle, | |
| &gEfiLegacyBiosProtocolGuid, | |
| EFI_NATIVE_INTERFACE, | |
| &Private->LegacyBios | |
| ); | |
| Private->Csm16PciInterfaceVersion = GetPciInterfaceVersion (Private); | |
| DEBUG (( | |
| DEBUG_INFO, | |
| "CSM16 PCI BIOS Interface Version: %02x.%02x\n", | |
| (UINT8)(Private->Csm16PciInterfaceVersion >> 8), | |
| (UINT8)Private->Csm16PciInterfaceVersion | |
| )); | |
| ASSERT (Private->Csm16PciInterfaceVersion != 0); | |
| return Status; | |
| } |