2ea3576e16
Current implementation uses following two methods
EnableNullDetection()
DisableNullDetection()
to enable/disable page 0. These two methods will check PCD
PcdNullPointerDetectionPropertyMask to know if the page 0 is disabled or not.
This is due to the fact that old GCD service doesn't provide paging related
attributes of memory block. Since this issue has been fixed, GCD services
can be used to determine the paging status of page 0. This is also make it
possible to just use a new macro
ACCESS_PAGE0_CODE(
<code accessing page 0>
);
to replace above methods to do the same job, which also makes code more
readability.
Cc: Liming Gao <liming.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
1196 lines
40 KiB
C
1196 lines
40 KiB
C
/** @file
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Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions
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of the BSD License which accompanies this distribution. The
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full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "LegacyBiosInterface.h"
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#define PHYSICAL_ADDRESS_TO_POINTER(Address) ((VOID *) ((UINTN) Address))
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//
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// define maximum number of HDD system supports
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//
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#define MAX_HDD_ENTRIES 0x30
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//
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// Module Global:
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// Since this driver will only ever produce one instance of the Private Data
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// protocol you are not required to dynamically allocate the PrivateData.
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//
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LEGACY_BIOS_INSTANCE mPrivateData;
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//
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// The SMBIOS table in EfiRuntimeServicesData memory
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//
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VOID *mRuntimeSmbiosEntryPoint = NULL;
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//
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// The SMBIOS table in EfiReservedMemoryType memory
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//
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EFI_PHYSICAL_ADDRESS mReserveSmbiosEntryPoint = 0;
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EFI_PHYSICAL_ADDRESS mStructureTableAddress = 0;
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UINTN mStructureTablePages = 0;
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BOOLEAN mEndOfDxe = FALSE;
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/**
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Do an AllocatePages () of type AllocateMaxAddress for EfiBootServicesCode
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memory.
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@param AllocateType Allocated Legacy Memory Type
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@param StartPageAddress Start address of range
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@param Pages Number of pages to allocate
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@param Result Result of allocation
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@retval EFI_SUCCESS Legacy16 code loaded
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@retval Other No protocol installed, unload driver.
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**/
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EFI_STATUS
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AllocateLegacyMemory (
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IN EFI_ALLOCATE_TYPE AllocateType,
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IN EFI_PHYSICAL_ADDRESS StartPageAddress,
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IN UINTN Pages,
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OUT EFI_PHYSICAL_ADDRESS *Result
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)
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{
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EFI_STATUS Status;
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EFI_PHYSICAL_ADDRESS MemPage;
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//
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// Allocate Pages of memory less <= StartPageAddress
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//
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MemPage = (EFI_PHYSICAL_ADDRESS) (UINTN) StartPageAddress;
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Status = gBS->AllocatePages (
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AllocateType,
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EfiBootServicesCode,
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Pages,
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&MemPage
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);
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//
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// Do not ASSERT on Status error but let caller decide since some cases
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// memory is already taken but that is ok.
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//
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if (!EFI_ERROR (Status)) {
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*Result = (EFI_PHYSICAL_ADDRESS) (UINTN) MemPage;
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}
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//
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// If reach here the status = EFI_SUCCESS
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//
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return Status;
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}
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/**
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This function is called when EFI needs to reserve an area in the 0xE0000 or 0xF0000
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64 KB blocks.
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Note: inconsistency with the Framework CSM spec. Per the spec, this function may be
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invoked only once. This limitation is relaxed to allow multiple calls in this implemenation.
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@param This Protocol instance pointer.
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@param LegacyMemorySize Size of required region
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@param Region Region to use. 00 = Either 0xE0000 or 0xF0000
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block Bit0 = 1 0xF0000 block Bit1 = 1 0xE0000
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block
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@param Alignment Address alignment. Bit mapped. First non-zero
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bit from right is alignment.
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@param LegacyMemoryAddress Region Assigned
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@retval EFI_SUCCESS Region assigned
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@retval EFI_ACCESS_DENIED Procedure previously invoked
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@retval Other Region not assigned
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**/
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EFI_STATUS
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EFIAPI
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LegacyBiosGetLegacyRegion (
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IN EFI_LEGACY_BIOS_PROTOCOL *This,
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IN UINTN LegacyMemorySize,
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IN UINTN Region,
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IN UINTN Alignment,
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OUT VOID **LegacyMemoryAddress
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)
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{
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LEGACY_BIOS_INSTANCE *Private;
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EFI_IA32_REGISTER_SET Regs;
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EFI_STATUS Status;
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UINT32 Granularity;
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Private = LEGACY_BIOS_INSTANCE_FROM_THIS (This);
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Private->LegacyRegion->UnLock (Private->LegacyRegion, 0xE0000, 0x20000, &Granularity);
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ZeroMem (&Regs, sizeof (EFI_IA32_REGISTER_SET));
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Regs.X.AX = Legacy16GetTableAddress;
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Regs.X.BX = (UINT16) Region;
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Regs.X.CX = (UINT16) LegacyMemorySize;
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Regs.X.DX = (UINT16) Alignment;
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Private->LegacyBios.FarCall86 (
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&Private->LegacyBios,
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Private->Legacy16CallSegment,
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Private->Legacy16CallOffset,
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&Regs,
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NULL,
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0
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);
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if (Regs.X.AX == 0) {
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*LegacyMemoryAddress = (VOID *) (((UINTN) Regs.X.DS << 4) + Regs.X.BX);
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Status = EFI_SUCCESS;
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} else {
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Status = EFI_OUT_OF_RESOURCES;
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}
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Private->Cpu->FlushDataCache (Private->Cpu, 0xE0000, 0x20000, EfiCpuFlushTypeWriteBackInvalidate);
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Private->LegacyRegion->Lock (Private->LegacyRegion, 0xE0000, 0x20000, &Granularity);
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return Status;
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}
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/**
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This function is called when copying data to the region assigned by
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EFI_LEGACY_BIOS_PROTOCOL.GetLegacyRegion().
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@param This Protocol instance pointer.
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@param LegacyMemorySize Size of data to copy
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@param LegacyMemoryAddress Legacy Region destination address Note: must
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be in region assigned by
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LegacyBiosGetLegacyRegion
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@param LegacyMemorySourceAddress Source of data
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@retval EFI_SUCCESS The data was copied successfully.
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@retval EFI_ACCESS_DENIED Either the starting or ending address is out of bounds.
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**/
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EFI_STATUS
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EFIAPI
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LegacyBiosCopyLegacyRegion (
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IN EFI_LEGACY_BIOS_PROTOCOL *This,
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IN UINTN LegacyMemorySize,
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IN VOID *LegacyMemoryAddress,
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IN VOID *LegacyMemorySourceAddress
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)
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{
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LEGACY_BIOS_INSTANCE *Private;
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UINT32 Granularity;
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if ((LegacyMemoryAddress < (VOID *)(UINTN)0xE0000 ) ||
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((UINTN) LegacyMemoryAddress + LegacyMemorySize > (UINTN) 0x100000)
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) {
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return EFI_ACCESS_DENIED;
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}
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//
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// There is no protection from writes over lapping if this function is
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// called multiple times.
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//
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Private = LEGACY_BIOS_INSTANCE_FROM_THIS (This);
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Private->LegacyRegion->UnLock (Private->LegacyRegion, 0xE0000, 0x20000, &Granularity);
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CopyMem (LegacyMemoryAddress, LegacyMemorySourceAddress, LegacyMemorySize);
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Private->Cpu->FlushDataCache (Private->Cpu, 0xE0000, 0x20000, EfiCpuFlushTypeWriteBackInvalidate);
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Private->LegacyRegion->Lock (Private->LegacyRegion, 0xE0000, 0x20000, &Granularity);
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return EFI_SUCCESS;
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}
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/**
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Find Legacy16 BIOS image in the FLASH device and shadow it into memory. Find
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the $EFI table in the shadow area. Thunk into the Legacy16 code after it had
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been shadowed.
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@param Private Legacy BIOS context data
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@retval EFI_SUCCESS Legacy16 code loaded
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@retval Other No protocol installed, unload driver.
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**/
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EFI_STATUS
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ShadowAndStartLegacy16 (
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IN LEGACY_BIOS_INSTANCE *Private
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)
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{
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EFI_STATUS Status;
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UINT8 *Ptr;
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UINT8 *PtrEnd;
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BOOLEAN Done;
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EFI_COMPATIBILITY16_TABLE *Table;
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UINT8 CheckSum;
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EFI_IA32_REGISTER_SET Regs;
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EFI_TO_COMPATIBILITY16_INIT_TABLE *EfiToLegacy16InitTable;
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EFI_TO_COMPATIBILITY16_BOOT_TABLE *EfiToLegacy16BootTable;
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VOID *LegacyBiosImage;
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UINTN LegacyBiosImageSize;
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UINTN E820Size;
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UINT32 *ClearPtr;
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BBS_TABLE *BbsTable;
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LEGACY_EFI_HDD_TABLE *LegacyEfiHddTable;
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UINTN Index;
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UINT32 TpmPointer;
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VOID *TpmBinaryImage;
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UINTN TpmBinaryImageSize;
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UINTN Location;
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UINTN Alignment;
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UINTN TempData;
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EFI_PHYSICAL_ADDRESS Address;
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UINT16 OldMask;
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UINT16 NewMask;
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UINT32 Granularity;
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EFI_GCD_MEMORY_SPACE_DESCRIPTOR Descriptor;
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Location = 0;
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Alignment = 0;
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//
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// we allocate the C/D/E/F segment as RT code so no one will use it any more.
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//
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Address = 0xC0000;
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gDS->GetMemorySpaceDescriptor (Address, &Descriptor);
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if (Descriptor.GcdMemoryType == EfiGcdMemoryTypeSystemMemory) {
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//
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// If it is already reserved, we should be safe, or else we allocate it.
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//
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Status = gBS->AllocatePages (
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AllocateAddress,
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EfiRuntimeServicesCode,
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0x40000/EFI_PAGE_SIZE,
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&Address
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);
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if (EFI_ERROR (Status)) {
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//
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// Bugbug: need to figure out whether C/D/E/F segment should be marked as reserved memory.
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//
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DEBUG ((DEBUG_ERROR, "Failed to allocate the C/D/E/F segment Status = %r", Status));
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}
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}
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//
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// start testtest
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// GetTimerValue (&Ticker);
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//
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// gRT->SetVariable (L"StartLegacy",
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// &gEfiGlobalVariableGuid,
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// EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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// sizeof (UINT64),
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// (VOID *)&Ticker
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// );
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// end testtest
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//
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EfiToLegacy16BootTable = &Private->IntThunk->EfiToLegacy16BootTable;
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Status = Private->LegacyBiosPlatform->GetPlatformInfo (
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Private->LegacyBiosPlatform,
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EfiGetPlatformBinarySystemRom,
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&LegacyBiosImage,
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&LegacyBiosImageSize,
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&Location,
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&Alignment,
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0,
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0
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);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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Private->BiosStart = (UINT32) (0x100000 - LegacyBiosImageSize);
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Private->OptionRom = 0xc0000;
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Private->LegacyBiosImageSize = (UINT32) LegacyBiosImageSize;
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//
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// Can only shadow into memory allocated for legacy useage.
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//
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ASSERT (Private->BiosStart > Private->OptionRom);
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//
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// Shadow Legacy BIOS. Turn on memory and copy image
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//
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Private->LegacyRegion->UnLock (Private->LegacyRegion, 0xc0000, 0x40000, &Granularity);
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ClearPtr = (VOID *) ((UINTN) 0xc0000);
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//
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// Initialize region from 0xc0000 to start of BIOS to all ffs. This allows unused
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// regions to be used by EMM386 etc.
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//
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SetMem ((VOID *) ClearPtr, (UINTN) (0x40000 - LegacyBiosImageSize), 0xff);
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TempData = Private->BiosStart;
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CopyMem (
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(VOID *) TempData,
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LegacyBiosImage,
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(UINTN) LegacyBiosImageSize
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);
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Private->Cpu->FlushDataCache (Private->Cpu, 0xc0000, 0x40000, EfiCpuFlushTypeWriteBackInvalidate);
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//
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// Search for Legacy16 table in Shadowed ROM
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//
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Done = FALSE;
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Table = NULL;
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for (Ptr = (UINT8 *) TempData; Ptr < (UINT8 *) ((UINTN) 0x100000) && !Done; Ptr += 0x10) {
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if (*(UINT32 *) Ptr == SIGNATURE_32 ('I', 'F', 'E', '$')) {
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Table = (EFI_COMPATIBILITY16_TABLE *) Ptr;
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PtrEnd = Ptr + Table->TableLength;
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for (CheckSum = 0; Ptr < PtrEnd; Ptr++) {
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CheckSum = (UINT8) (CheckSum +*Ptr);
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}
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Done = TRUE;
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}
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}
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if (Table == NULL) {
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DEBUG ((EFI_D_ERROR, "No Legacy16 table found\n"));
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return EFI_NOT_FOUND;
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}
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if (!Done) {
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//
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// Legacy16 table header checksum error.
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//
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DEBUG ((EFI_D_ERROR, "Legacy16 table found with bad talbe header checksum\n"));
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}
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//
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// Remember location of the Legacy16 table
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//
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Private->Legacy16Table = Table;
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Private->Legacy16CallSegment = Table->Compatibility16CallSegment;
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Private->Legacy16CallOffset = Table->Compatibility16CallOffset;
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EfiToLegacy16InitTable = &Private->IntThunk->EfiToLegacy16InitTable;
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Private->Legacy16InitPtr = EfiToLegacy16InitTable;
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Private->Legacy16BootPtr = &Private->IntThunk->EfiToLegacy16BootTable;
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Private->InternalIrqRoutingTable = NULL;
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Private->NumberIrqRoutingEntries = 0;
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Private->BbsTablePtr = NULL;
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Private->LegacyEfiHddTable = NULL;
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Private->DiskEnd = 0;
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Private->Disk4075 = 0;
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Private->HddTablePtr = &Private->IntThunk->EfiToLegacy16BootTable.HddInfo;
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Private->NumberHddControllers = MAX_IDE_CONTROLLER;
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Private->Dump[0] = 'D';
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Private->Dump[1] = 'U';
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Private->Dump[2] = 'M';
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Private->Dump[3] = 'P';
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ZeroMem (
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Private->Legacy16BootPtr,
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sizeof (EFI_TO_COMPATIBILITY16_BOOT_TABLE)
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);
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//
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// Store away a copy of the EFI System Table
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//
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Table->EfiSystemTable = (UINT32) (UINTN) gST;
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//
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// IPF CSM integration -Bug
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//
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// Construct the Legacy16 boot memory map. This sets up number of
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// E820 entries.
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//
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LegacyBiosBuildE820 (Private, &E820Size);
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//
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// Initialize BDA and EBDA standard values needed to load Legacy16 code
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//
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LegacyBiosInitBda (Private);
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LegacyBiosInitCmos (Private);
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//
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// All legacy interrupt should be masked when do initialization work from legacy 16 code.
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//
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Private->Legacy8259->GetMask(Private->Legacy8259, &OldMask, NULL, NULL, NULL);
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NewMask = 0xFFFF;
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Private->Legacy8259->SetMask(Private->Legacy8259, &NewMask, NULL, NULL, NULL);
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//
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// Call into Legacy16 code to do an INIT
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//
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ZeroMem (&Regs, sizeof (EFI_IA32_REGISTER_SET));
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Regs.X.AX = Legacy16InitializeYourself;
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Regs.X.ES = EFI_SEGMENT (*((UINT32 *) &EfiToLegacy16InitTable));
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Regs.X.BX = EFI_OFFSET (*((UINT32 *) &EfiToLegacy16InitTable));
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Private->LegacyBios.FarCall86 (
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&Private->LegacyBios,
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Table->Compatibility16CallSegment,
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Table->Compatibility16CallOffset,
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&Regs,
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NULL,
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0
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);
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//
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// Restore original legacy interrupt mask value
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//
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Private->Legacy8259->SetMask(Private->Legacy8259, &OldMask, NULL, NULL, NULL);
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if (Regs.X.AX != 0) {
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return EFI_DEVICE_ERROR;
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}
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//
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// start testtest
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// GetTimerValue (&Ticker);
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//
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// gRT->SetVariable (L"BackFromInitYourself",
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// &gEfiGlobalVariableGuid,
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// EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
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// sizeof (UINT64),
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// (VOID *)&Ticker
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// );
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// end testtest
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//
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// Copy E820 table after InitializeYourself is completed
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//
|
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ZeroMem (&Regs, sizeof (EFI_IA32_REGISTER_SET));
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Regs.X.AX = Legacy16GetTableAddress;
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Regs.X.CX = (UINT16) E820Size;
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Regs.X.DX = 1;
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Private->LegacyBios.FarCall86 (
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&Private->LegacyBios,
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Table->Compatibility16CallSegment,
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Table->Compatibility16CallOffset,
|
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&Regs,
|
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NULL,
|
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0
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);
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Table->E820Pointer = (UINT32) (Regs.X.DS * 16 + Regs.X.BX);
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Table->E820Length = (UINT32) E820Size;
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if (Regs.X.AX != 0) {
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DEBUG ((EFI_D_ERROR, "Legacy16 E820 length insufficient\n"));
|
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} else {
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TempData = Table->E820Pointer;
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CopyMem ((VOID *) TempData, Private->E820Table, E820Size);
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}
|
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//
|
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// Get PnPInstallationCheck Info.
|
|
//
|
|
Private->PnPInstallationCheckSegment = Table->PnPInstallationCheckSegment;
|
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Private->PnPInstallationCheckOffset = Table->PnPInstallationCheckOffset;
|
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|
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//
|
|
// Check if PCI Express is supported. If yes, Save base address.
|
|
//
|
|
Status = Private->LegacyBiosPlatform->GetPlatformInfo (
|
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Private->LegacyBiosPlatform,
|
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EfiGetPlatformPciExpressBase,
|
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NULL,
|
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NULL,
|
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&Location,
|
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&Alignment,
|
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0,
|
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0
|
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);
|
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if (!EFI_ERROR (Status)) {
|
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Private->Legacy16Table->PciExpressBase = (UINT32)Location;
|
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Location = 0;
|
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}
|
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//
|
|
// 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 ((EFI_D_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;
|
|
//
|
|
// Skip Floppy and possible onboard IDE drives
|
|
//
|
|
EfiToLegacy16BootTable->NumberBbsEntries = 1 + 2 * MAX_IDE_CONTROLLER;
|
|
|
|
for (Index = 0; Index < (sizeof (Private->IntThunk->BbsTable) / sizeof (BBS_TABLE)); 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 ((EFI_D_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 ((EFI_D_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 ((EFI_D_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 interupt vectors and BDA.
|
|
//
|
|
AllocateLegacyMemory (
|
|
AllocateAddress,
|
|
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,
|
|
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,
|
|
MemStart,
|
|
1,
|
|
&StartAddress
|
|
);
|
|
if (!EFI_ERROR (Status)) {
|
|
MemoryPtr = (VOID *) ((UINTN) StartAddress);
|
|
ZeroMem (MemoryPtr, 0x1000);
|
|
} else {
|
|
DEBUG ((EFI_D_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,
|
|
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,
|
|
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,
|
|
0x1000000,
|
|
EFI_SIZE_TO_PAGES (MemorySize),
|
|
&MemoryAddress
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
//
|
|
// If it fails, allocate high PMM Memory under 4GB
|
|
//
|
|
Status = AllocateLegacyMemory (
|
|
AllocateMaxAddress,
|
|
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 ((EFI_D_INFO, "CSM16 PCI BIOS Interface Version: %02x.%02x\n",
|
|
(UINT8) (Private->Csm16PciInterfaceVersion >> 8),
|
|
(UINT8) Private->Csm16PciInterfaceVersion
|
|
));
|
|
ASSERT (Private->Csm16PciInterfaceVersion != 0);
|
|
return Status;
|
|
}
|