Miki, Thanks for the contribution. I need sometime to look at all the APIs the new library exposes and may get back to you with more comments next week.
Thanks, Ray > -----Original Message----- > From: Shindo, Miki <miki.shi...@intel.com> > Sent: Friday, March 6, 2020 6:14 AM > To: devel@edk2.groups.io > Cc: Chaganty, Rangasai V <rangasai.v.chaga...@intel.com>; Chiu, Chasel > <chasel.c...@intel.com>; Desimone, Nathaniel L > <nathaniel.l.desim...@intel.com>; Agyeman, Prince <prince.agye...@intel.com>; > Ni, Ray <ray...@intel.com> > Subject: [edk2-platform:PATCH v2] IntelSiliconPkg/DxeAslUpdateLib: Add > DxeAslUpdateLib support > > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2536 > > This commit adds DxeAslUpdateLib library support in IntelSiliconPkg, > which allows AML to be updated in DXE. > > Signed-off-by: Miki Shindo <miki.shi...@intel.com> > Cc: Sai Chaganty <rangasai.v.chaga...@intel.com> > Cc: Chasel Chiu <chasel.c...@intel.com> > Cc: Nate DeSimone <nathaniel.l.desim...@intel.com> > Cc: Prince Agyeman <prince.agye...@intel.com> > Cc: Ray Ni <ray...@intel.com> > Reviewed-by: Chasel Chiu <chasel.c...@intel.com> > --- > Silicon/Intel/IntelSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.c | > 553 > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > ++++++++++++++++++++++++++++++++++++++ > Silicon/Intel/IntelSiliconPkg/Include/Library/AslUpdateLib.h | > 178 > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec | > 4 ++++ > Silicon/Intel/IntelSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.inf | > 42 > ++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 777 insertions(+) > > diff --git > a/Silicon/Intel/IntelSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.c > b/Silicon/Intel/IntelSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.c > new file mode 100644 > index 0000000000..1eae8bca62 > --- /dev/null > +++ b/Silicon/Intel/IntelSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.c > @@ -0,0 +1,553 @@ > +/** @file > + Boot service DXE ASL update library implementation. > + Note that the current version of the library updates AML. > + > + These functions in this file can be called during DXE and cannot be called > during runtime > + or in SMM which should use a RT or SMM library. > + > + This library uses the ACPI Support protocol. > + > + Copyright (c) 2020, Intel Corporation. All rights reserved.<BR> > + SPDX-License-Identifier: BSD-2-Clause-Patent > +**/ > + > +#include <Base.h> > +#include <Uefi/UefiBaseType.h> > +#include <Uefi/UefiSpec.h> > +#include <Library/UefiBootServicesTableLib.h> > +#include <Library/DebugLib.h> > +#include <Library/UefiLib.h> > +#include <Library/BaseMemoryLib.h> > +#include <Library/MemoryAllocationLib.h> > + > +#include <Library/AslUpdateLib.h> > + > +// > +// Function implemenations > +// > +static EFI_ACPI_SDT_PROTOCOL *mAcpiSdt = NULL; > +static EFI_ACPI_TABLE_PROTOCOL *mAcpiTable = NULL; > + > +/** > + Initialize the ASL update library state. > + This must be called prior to invoking other library functions. > + > + @retval EFI_SUCCESS - The function completed successfully. > +**/ > +EFI_STATUS > +InitializeAslUpdateLib ( > + VOID > + ) > +{ > + EFI_STATUS Status; > + > + /// > + /// Locate ACPI tables > + /// > + Status = gBS->LocateProtocol (&gEfiAcpiSdtProtocolGuid, NULL, (VOID **) > &mAcpiSdt); > + ASSERT_EFI_ERROR (Status); > + Status = gBS->LocateProtocol (&gEfiAcpiTableProtocolGuid, NULL, (VOID **) > &mAcpiTable); > + ASSERT_EFI_ERROR (Status); > + return Status; > +} > + > +/** > + This function calculates and updates an UINT8 checksum. > + > + @param Buffer Pointer to buffer to checksum > + @param Size Number of bytes to checksum > + @param ChecksumOffset Offset to place the checksum result in > + > + @return EFI_SUCCESS The function completed successfully. > + > +**/ > +EFI_STATUS > +AcpiPlatformChecksum ( > + IN VOID *Buffer, > + IN UINTN Size, > + IN UINTN ChecksumOffset > + ) > +{ > + UINT8 Sum; > + UINT8 *Ptr; > + > + Sum = 0; > + // > + // Initialize pointer > + // > + Ptr = Buffer; > + > + // > + // set checksum to 0 first > + // > + Ptr[ChecksumOffset] = 0; > + > + // > + // add all content of buffer > + // > + while ((Size--) != 0) { > + Sum = (UINT8) (Sum + (*Ptr++)); > + } > + // > + // set checksum > + // > + Ptr = Buffer; > + Ptr[ChecksumOffset] = (UINT8) (0xff - Sum + 1); > + > + return EFI_SUCCESS; > +} > + > +/** > + This procedure will update immediate value assigned to a Name > + > + @param[in] AslSignature - The signature of Operation Region that we > want to update. > + @param[in] Buffer - source of data to be written over original > aml > + @param[in] Length - length of data to be overwritten > + > + @retval EFI_SUCCESS - The function completed successfully. > + @retval EFI_NOT_FOUND - Failed to locate AcpiTable. > +**/ > +EFI_STATUS > +UpdateNameAslCode ( > + IN UINT32 AslSignature, > + IN VOID *Buffer, > + IN UINTN Length > + ) > +{ > + EFI_STATUS Status; > + EFI_ACPI_DESCRIPTION_HEADER *Table; > + UINT8 *CurrPtr; > + UINT8 *EndPtr; > + UINT32 *Signature; > + UINT8 *DsdtPointer; > + UINTN Handle; > + UINT8 DataSize; > + > + if (mAcpiTable == NULL) { > + InitializeAslUpdateLib (); > + if (mAcpiTable == NULL) { > + return EFI_NOT_READY; > + } > + } > + > + /// > + /// Locate table with matching ID > + /// > + Handle = 0; > + Status = LocateAcpiTableBySignature ( > + EFI_ACPI_3_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE, > + (EFI_ACPI_DESCRIPTION_HEADER **) &Table, > + &Handle > + ); > + if (EFI_ERROR (Status)) { > + return Status; > + } > + > + /// > + /// Point to the beginning of the DSDT table > + /// > + CurrPtr = (UINT8 *) Table; > + if (CurrPtr == NULL) { > + return EFI_NOT_FOUND; > + } > + > + // > + // EndPtr = beginning of table + length of table > + // > + EndPtr = CurrPtr + ((EFI_ACPI_COMMON_HEADER *) CurrPtr)->Length; > + > + /// > + /// Loop through the ASL looking for values that we must fix up. > + /// > + for (DsdtPointer = CurrPtr; DsdtPointer < EndPtr; DsdtPointer++) { > + /// > + /// Get a pointer to compare for signature > + /// > + Signature = (UINT32 *) DsdtPointer; > + /// > + /// Check if this is the Device Object signature we are looking for > + /// > + if ((*Signature) == AslSignature) { > + /// > + /// Look for Name Encoding > + /// > + if (*(DsdtPointer-1) == AML_NAME_OP) { > + /// > + /// Check if size of new and old data is the same > + /// > + DataSize = *(DsdtPointer+4); > + if ((Length == 1 && DataSize == 0xA) || > + (Length == 2 && DataSize == 0xB) || > + (Length == 4 && DataSize == 0xC)) { > + CopyMem (DsdtPointer+5, Buffer, Length); > + } else if (Length == 1 && ((*(UINT8*) Buffer) == 0 || (*(UINT8*) > Buffer) == 1) && (DataSize == 0 || DataSize == 1)) { > + CopyMem (DsdtPointer+4, Buffer, Length); > + } else { > + FreePool (Table); > + return EFI_BAD_BUFFER_SIZE; > + } > + Status = mAcpiTable->UninstallAcpiTable ( > + mAcpiTable, > + Handle > + ); > + Handle = 0; > + Status = mAcpiTable->InstallAcpiTable ( > + mAcpiTable, > + Table, > + Table->Length, > + &Handle > + ); > + FreePool (Table); > + return Status; > + } > + } > + } > + return EFI_NOT_FOUND; > +} > + > +/** > + This procedure will update immediate value assigned to a Name in SSDT table > + > + @param[in] TableId - Pointer to an ASCII string containing the > OEM Table ID from the ACPI table header > + @param[in] TableIdSize - Length of the TableId to match. Table ID > are 8 bytes long, this function > + @param[in] Buffer - source of data to be written over original > aml > + @param[in] Length - length of data to be overwritten > + > + @retval EFI_SUCCESS - The function completed successfully. > + @retval EFI_NOT_FOUND - Failed to locate AcpiTable. > +**/ > +EFI_STATUS > +UpdateSsdtNameAslCode ( > + IN UINT8 *TableId, > + IN UINT8 TableIdSize, > + IN UINT32 AslSignature, > + IN VOID *Buffer, > + IN UINTN Length > + ) > +{ > + EFI_STATUS Status; > + EFI_ACPI_DESCRIPTION_HEADER *Table; > + UINT8 *CurrPtr; > + UINT32 *Signature; > + UINT8 *SsdtPointer; > + UINTN Handle; > + UINT8 DataSize; > + > + if (mAcpiTable == NULL) { > + InitializeAslUpdateLib (); > + if (mAcpiTable == NULL) { > + return EFI_NOT_READY; > + } > + } > + > + /// > + /// Locate table with matching ID > + /// > + Handle = 0; > + Status = LocateAcpiTableByOemTableId ( > + TableId, > + TableIdSize, > + (EFI_ACPI_DESCRIPTION_HEADER **) &Table, > + &Handle > + ); > + if (EFI_ERROR (Status)) { > + return Status; > + } > + > + /// > + /// Point to the beginning of the DSDT table > + /// > + CurrPtr = (UINT8 *) Table; > + if (CurrPtr == NULL) { > + return EFI_NOT_FOUND; > + } > + > + /// > + /// Loop through the ASL looking for values that we must fix up. > + /// > + for (SsdtPointer = CurrPtr; SsdtPointer <= (CurrPtr + > ((EFI_ACPI_COMMON_HEADER *) CurrPtr)->Length); SsdtPointer++) { > + /// > + /// Get a pointer to compare for signature > + /// > + Signature = (UINT32 *) SsdtPointer; > + /// > + /// Check if this is the Device Object signature we are looking for > + /// > + if ((*Signature) == AslSignature) { > + /// > + /// Look for Name Encoding > + /// > + if (*(SsdtPointer-1) == AML_NAME_OP) { > + /// > + /// Check if size of new and old data is the same > + /// > + DataSize = *(SsdtPointer+4); > + if ((Length == 1 && DataSize == 0xA) || > + (Length == 2 && DataSize == 0xB) || > + (Length == 4 && DataSize == 0xC)) { > + CopyMem (SsdtPointer+5, Buffer, Length); > + } else if (Length == 1 && ((*(UINT8*) Buffer) == 0 || (*(UINT8*) > Buffer) == 1) && (DataSize == 0 || DataSize == 1)) { > + CopyMem (SsdtPointer+4, Buffer, Length); > + } else { > + return EFI_BAD_BUFFER_SIZE; > + } > + AcpiPlatformChecksum ( > + Table, > + Table->Length, > + OFFSET_OF (EFI_ACPI_DESCRIPTION_HEADER, > + Checksum) > + ); > + return Status; > + } > + } > + } > + return EFI_NOT_FOUND; > +} > + > +/** > + This procedure will update the name of ASL Method > + > + @param[in] AslSignature - The signature of Operation Region that we > want to update. > + @param[in] Buffer - source of data to be written over original > aml > + @param[in] Length - length of data to be overwritten > + > + @retval EFI_SUCCESS - The function completed successfully. > + @retval EFI_NOT_FOUND - Failed to locate AcpiTable. > +**/ > +EFI_STATUS > +UpdateMethodAslCode ( > + IN UINT32 AslSignature, > + IN VOID *Buffer, > + IN UINTN Length > + ) > +{ > + EFI_STATUS Status; > + EFI_ACPI_DESCRIPTION_HEADER *Table; > + UINT8 *CurrPtr; > + UINT32 *Signature; > + UINT8 *DsdtPointer; > + UINTN Handle; > + > + if (mAcpiTable == NULL) { > + InitializeAslUpdateLib (); > + if (mAcpiTable == NULL) { > + return EFI_NOT_READY; > + } > + } > + > + /// > + /// Locate table with matching ID > + /// > + Handle = 0; > + Status = LocateAcpiTableBySignature ( > + EFI_ACPI_3_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE, > + (EFI_ACPI_DESCRIPTION_HEADER **) &Table, > + &Handle > + ); > + if (EFI_ERROR (Status)) { > + return Status; > + } > + > + /// > + /// Point to the beginning of the DSDT table > + /// > + CurrPtr = (UINT8 *) Table; > + if (CurrPtr == NULL) { > + return EFI_NOT_FOUND; > + } > + > + /// > + /// Loop through the ASL looking for values that we must fix up. > + /// > + for (DsdtPointer = CurrPtr; DsdtPointer <= (CurrPtr + > ((EFI_ACPI_COMMON_HEADER *) CurrPtr)->Length); DsdtPointer++) { > + /// > + /// Get a pointer to compare for signature > + /// > + Signature = (UINT32 *) DsdtPointer; > + /// > + /// Check if this is the Device Object signature we are looking for > + /// > + if ((*Signature) == AslSignature) { > + /// > + /// Look for Name Encoding > + /// > + if ((*(DsdtPointer-3) == AML_METHOD_OP) > + || (*(DsdtPointer-2) == AML_METHOD_OP) > + ) > + { > + CopyMem (DsdtPointer, Buffer, Length); > + Status = mAcpiTable->UninstallAcpiTable ( > + mAcpiTable, > + Handle > + ); > + Handle = 0; > + Status = mAcpiTable->InstallAcpiTable ( > + mAcpiTable, > + Table, > + Table->Length, > + &Handle > + ); > + FreePool (Table); > + return Status; > + } > + } > + } > + return EFI_NOT_FOUND; > +} > + > +/** > + This function uses the ACPI SDT protocol to locate an ACPI table. > + It is really only useful for finding tables that only have a single > instance, > + e.g. FADT, FACS, MADT, etc. It is not good for locating SSDT, etc. > + > + @param[in] Signature - Pointer to an ASCII string containing the > OEM Table ID from the ACPI table header > + @param[in, out] Table - Updated with a pointer to the table > + @param[in, out] Handle - AcpiSupport protocol table handle for the > table found > + @param[in, out] Version - The version of the table desired > + > + @retval EFI_SUCCESS - The function completed successfully. > +**/ > +EFI_STATUS > +LocateAcpiTableBySignature ( > + IN UINT32 Signature, > + IN OUT EFI_ACPI_DESCRIPTION_HEADER **Table, > + IN OUT UINTN *Handle > + ) > +{ > + EFI_STATUS Status; > + INTN Index; > + EFI_ACPI_TABLE_VERSION Version; > + EFI_ACPI_DESCRIPTION_HEADER *OrgTable; > + > + if (mAcpiSdt == NULL) { > + InitializeAslUpdateLib (); > + if (mAcpiSdt == NULL) { > + return EFI_NOT_READY; > + } > + } > + > + /// > + /// Locate table with matching ID > + /// > + Version = 0; > + Index = 0; > + do { > + Status = mAcpiSdt->GetAcpiTable (Index, (EFI_ACPI_SDT_HEADER > **)&OrgTable, &Version, Handle); > + if (Status == EFI_NOT_FOUND) { > + break; > + } > + ASSERT_EFI_ERROR (Status); > + Index++; > + } while (OrgTable->Signature != Signature); > + > + if (Status != EFI_NOT_FOUND) { > + *Table = AllocateCopyPool (OrgTable->Length, OrgTable); > + ASSERT (*Table); > + } > + > + /// > + /// If we found the table, there will be no error. > + /// > + return Status; > +} > + > +/** > + This function uses the ACPI SDT protocol to locate an ACPI SSDT table. > + > + @param[in] TableId - Pointer to an ASCII string containing the > OEM Table ID from the ACPI table header > + @param[in] TableIdSize - Length of the TableId to match. Table ID > are 8 bytes long, this function > + will consider it a match if the first > TableIdSize bytes match > + @param[in, out] Table - Updated with a pointer to the table > + @param[in, out] Handle - AcpiSupport protocol table handle for the > table found > + @param[in, out] Version - See AcpiSupport protocol, GetAcpiTable > function for use > + > + @retval EFI_SUCCESS - The function completed successfully. > +**/ > +EFI_STATUS > +LocateAcpiTableByOemTableId ( > + IN UINT8 *TableId, > + IN UINT8 TableIdSize, > + IN OUT EFI_ACPI_DESCRIPTION_HEADER **Table, > + IN OUT UINTN *Handle > + ) > +{ > + EFI_STATUS Status; > + INTN Index; > + EFI_ACPI_TABLE_VERSION Version; > + EFI_ACPI_DESCRIPTION_HEADER *OrgTable; > + > + if (mAcpiSdt == NULL) { > + InitializeAslUpdateLib (); > + if (mAcpiSdt == NULL) { > + return EFI_NOT_READY; > + } > + } > + /// > + /// Locate table with matching ID > + /// > + Version = 0; > + Index = 0; > + do { > + Status = mAcpiSdt->GetAcpiTable (Index, (EFI_ACPI_SDT_HEADER > **)&OrgTable, &Version, Handle); > + if (Status == EFI_NOT_FOUND) { > + break; > + } > + ASSERT_EFI_ERROR (Status); > + Index++; > + } while (CompareMem (&(OrgTable->OemTableId), TableId, TableIdSize)); > + > + if (Status != EFI_NOT_FOUND) { > + *Table = OrgTable; > + ASSERT (*Table); > + } > + > + /// > + /// If we found the table, there will be no error. > + /// > + return Status; > +} > + > +/** > + This function calculates and updates an UINT8 checksum. > + > + @param[in] Buffer Pointer to buffer to checksum > + @param[in] Size Number of bytes to checksum > + @param[in] ChecksumOffset Offset to place the checksum result in > + > + @retval EFI_SUCCESS The function completed successfully. > +**/ > +EFI_STATUS > +AcpiChecksum ( > + IN VOID *Buffer, > + IN UINTN Size, > + IN UINTN ChecksumOffset > + ) > +{ > + UINT8 Sum; > + UINT8 *Ptr; > + > + Sum = 0; > + /// > + /// Initialize pointer > + /// > + Ptr = Buffer; > + > + /// > + /// set checksum to 0 first > + /// > + Ptr[ChecksumOffset] = 0; > + > + /// > + /// add all content of buffer > + /// > + while (Size--) { > + Sum = (UINT8) (Sum + (*Ptr++)); > + } > + /// > + /// set checksum > + /// > + Ptr = Buffer; > + Ptr[ChecksumOffset] = (UINT8) (0xff - Sum + 1); > + > + return EFI_SUCCESS; > +} > diff --git a/Silicon/Intel/IntelSiliconPkg/Include/Library/AslUpdateLib.h > b/Silicon/Intel/IntelSiliconPkg/Include/Library/AslUpdateLib.h > new file mode 100644 > index 0000000000..108bb52413 > --- /dev/null > +++ b/Silicon/Intel/IntelSiliconPkg/Include/Library/AslUpdateLib.h > @@ -0,0 +1,178 @@ > +/** @file > + ASL dynamic update library definitions. > + > + This library provides dymanic update to various ASL structures. > + There may be different libraries for different environments (PEI, BS, RT, > SMM). > + Make sure you meet the requirements for the library (protocol > dependencies, use > + restrictions, etc). > + > + Note that the current version of the library updates AML. > + > + Copyright (c) 2020 Intel Corporation. All rights reserved. <BR> > + > + SPDX-License-Identifier: BSD-2-Clause-Patent > +**/ > +#ifndef _ASL_UPDATE_LIB_H_ > +#define _ASL_UPDATE_LIB_H_ > + > +// > +// Include files > +// > +#include <IndustryStandard/Acpi.h> > +#include <Protocol/AcpiTable.h> > +#include <Protocol/AcpiSystemDescriptionTable.h> > + > +// > +// AML parsing definitions > +// > +#define AML_RESRC_TEMP_END_TAG 0x0079 > + > +// > +// ASL PSS package structure layout > +// > +#pragma pack (1) > +typedef struct { > + UINT8 NameOp; // 12h ;First opcode is a NameOp. > + UINT8 PackageLead; // 20h ;First opcode is a NameOp. > + UINT8 NumEntries; // 06h ;First opcode is a NameOp. > + UINT8 DwordPrefix1; // 0Ch > + UINT32 CoreFrequency; // 00h > + UINT8 DwordPrefix2; // 0Ch > + UINT32 Power; // 00h > + UINT8 DwordPrefix3; // 0Ch > + UINT32 TransLatency; // 00h > + UINT8 DwordPrefix4; // 0Ch > + UINT32 BmLatency; // 00h > + UINT8 DwordPrefix5; // 0Ch > + UINT32 Control; // 00h > + UINT8 DwordPrefix6; // 0Ch > + UINT32 Status; // 00h > +} PSS_PACKAGE_LAYOUT; > +#pragma pack() > + > +/** > + Initialize the ASL update library state. > + This must be called prior to invoking other library functions. > + > + > + @retval EFI_SUCCESS The function completed successfully. > +**/ > +EFI_STATUS > +InitializeAslUpdateLib ( > + VOID > + ); > + > +/** > + This procedure will update immediate value assigned to a Name > + > + @param[in] AslSignature The signature of Operation Region > that we want to update. > + @param[in] Buffer source of data to be written over > original aml > + @param[in] Length length of data to be overwritten > + > + @retval EFI_SUCCESS The function completed successfully. > +**/ > +EFI_STATUS > +UpdateNameAslCode( > + IN UINT32 AslSignature, > + IN VOID *Buffer, > + IN UINTN Length > + ); > + > +/** > + This procedure will update the name of ASL Method > + > + @param[in] AslSignature - The signature of Operation Region that we > want to update. > + @param[in] Buffer - source of data to be written over original > aml > + @param[in] Length - length of data to be overwritten > + > + @retval EFI_SUCCESS - The function completed successfully. > + @retval EFI_NOT_FOUND - Failed to locate AcpiTable. > +**/ > +EFI_STATUS > +UpdateSsdtNameAslCode ( > + IN UINT8 *TableId, > + IN UINT8 TableIdSize, > + IN UINT32 AslSignature, > + IN VOID *Buffer, > + IN UINTN Length > + ); > + > +/** > + This procedure will update the name of ASL Method > + > + @param[in] AslSignature - The signature of Operation Region that we > want to update. > + @param[in] Buffer - source of data to be written over original > aml > + @param[in] Length - length of data to be overwritten > + > + @retval EFI_SUCCESS - The function completed successfully. > + @retval EFI_NOT_FOUND - Failed to locate AcpiTable. > +**/ > +EFI_STATUS > +UpdateMethodAslCode ( > + IN UINT32 AslSignature, > + IN VOID *Buffer, > + IN UINTN Length > + ); > + > +/** > + This function uses the ACPI support protocol to locate an ACPI table using > the . > + It is really only useful for finding tables that only have a single > instance, > + e.g. FADT, FACS, MADT, etc. It is not good for locating SSDT, etc. > + Matches are determined by finding the table with ACPI table that has > + a matching signature and version. > + > + @param[in] Signature Pointer to an ASCII string > containing the Signature to match > + @param[in, out] Table Updated with a pointer to the table > + @param[in, out] Handle AcpiSupport protocol table handle > for the table found > + @param[in, out] Version On input, the version of the table > desired, > + on output, the versions the table > belongs to > + @see AcpiSupport protocol for details > + > + @retval EFI_SUCCESS The function completed successfully. > +**/ > +EFI_STATUS > +LocateAcpiTableBySignature ( > + IN UINT32 Signature, > + IN OUT EFI_ACPI_DESCRIPTION_HEADER **Table, > + IN OUT UINTN *Handle > + ); > + > +/** > + This function uses the ACPI support protocol to locate an ACPI SSDT table. > + The table is located by searching for a matching OEM Table ID field. > + Partial match searches are supported via the TableIdSize parameter. > + > + @param[in] TableId Pointer to an ASCII string > containing the OEM Table ID from the ACPI table header > + @param[in] TableIdSize Length of the TableId to match. > Table ID are 8 bytes long, this function > + will consider it a match if the > first TableIdSize bytes match > + @param[in, out] Table Updated with a pointer to the table > + @param[in, out] Handle AcpiSupport protocol table handle > for the table found > + @param[in, out] Version See AcpiSupport protocol, > GetAcpiTable function for use > + > + @retval EFI_SUCCESS The function completed successfully. > +**/ > +EFI_STATUS > +LocateAcpiTableByOemTableId ( > + IN UINT8 *TableId, > + IN UINT8 TableIdSize, > + IN OUT EFI_ACPI_DESCRIPTION_HEADER **Table, > + IN OUT UINTN *Handle > + ); > + > +/** > + This function calculates and updates an UINT8 checksum. > + > + @param[in] Buffer Pointer to buffer to checksum > + @param[in] Size Number of bytes to checksum > + @param[in] ChecksumOffset Offset to place the checksum result > in > + > + @retval EFI_SUCCESS The function completed successfully. > +**/ > +EFI_STATUS > +AcpiChecksum ( > + IN VOID *Buffer, > + IN UINTN Size, > + IN UINTN ChecksumOffset > + ); > + > +#endif > diff --git a/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec > b/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec > index 3c49fb289c..d5debbf0da 100644 > --- a/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec > +++ b/Silicon/Intel/IntelSiliconPkg/IntelSiliconPkg.dec > @@ -30,6 +30,10 @@ > # > PeiGetVtdPmrAlignmentLib|Include/Library/PeiGetVtdPmrAlignmentLib.h > > + ## @libraryclass Provides services to update AML in DXE > + # > + AslUpdateLib|Include/Library/AslUpdateLib.h > + > [Guids] > ## GUID for Package token space > # {A9F8D54E-1107-4F0A-ADD0-4587E7A4A735} > diff --git > a/Silicon/Intel/IntelSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.inf > b/Silicon/Intel/IntelSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.inf > new file mode 100644 > index 0000000000..1183b320d5 > --- /dev/null > +++ > b/Silicon/Intel/IntelSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.inf > @@ -0,0 +1,42 @@ > +## @file > +# Provides services to update ASL tables. > +# Note that the current version of the library updates AML. > +# > +# Copyright (c) 2020, Intel Corporation. All rights reserved.<BR> > +# > +# SPDX-License-Identifier: BSD-2-Clause-Patent > +# > +## > + > + > + > +[Defines] > +INF_VERSION = 0x00010017 > +BASE_NAME = DxeAslUpdateLib > +FILE_GUID = 8621697D-4E3A-4bf2-ADB0-3E2FF06559CA > +VERSION_STRING = 1.0 > +MODULE_TYPE = BASE > +LIBRARY_CLASS = AslUpdateLib > + > + > +[LibraryClasses] > +BaseLib > +IoLib > +DebugLib > +PcdLib > +BaseMemoryLib > +UefiLib > +MemoryAllocationLib > + > + > +[Packages] > +MdePkg/MdePkg.dec > +IntelSiliconPkg/IntelSiliconPkg.dec > + > +[Sources] > +DxeAslUpdateLib.c > + > + > +[Protocols] > +gEfiAcpiTableProtocolGuid ## CONSUMES > +gEfiAcpiSdtProtocolGuid ## CONSUMES > -- > 2.16.2.windows.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. 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