[edk2-devel] [PATCH 1/1] EmbeddedPkg/AcpiLib: Add more helper functions
Abner Chang
abner.chang at hpe.com
Sun Aug 22 14:42:35 UTC 2021
Hi Pham,
First at all, you have to update the copyright. Other comments are in below,
> -----Original Message-----
> From: Nhi Pham [mailto:nhi at os.amperecomputing.com]
> Sent: Tuesday, August 17, 2021 9:24 PM
> To: devel at edk2.groups.io
> Cc: patches at amperecomputing.com; Nhi Pham
> <nhi at os.amperecomputing.com>; Leif Lindholm <leif at nuviainc.com>; Ard
> Biesheuvel <ardb+tianocore at kernel.org>; Chang, Abner (HPS SW/FW
> Technologist) <abner.chang at hpe.com>; Schaefer, Daniel
> <daniel.schaefer at hpe.com>
> Subject: [PATCH 1/1] EmbeddedPkg/AcpiLib: Add more helper functions
>
> This adds more helper functions that assist in calculating the checksum,
> locating an ACPI table by signature, and updating an AML integer object.
>
> Cc: Leif Lindholm <leif at nuviainc.com>
> Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
> Cc: Abner Chang <abner.chang at hpe.com>
> Cc: Daniel Schaefer <daniel.schaefer at hpe.com>
> Signed-off-by: Nhi Pham <nhi at os.amperecomputing.com>
> ---
> EmbeddedPkg/Library/AcpiLib/AcpiLib.inf | 2 +
> EmbeddedPkg/Include/Library/AcpiLib.h | 68 ++++++++
> EmbeddedPkg/Library/AcpiLib/AcpiLib.c | 183 ++++++++++++++++++++
> 3 files changed, 253 insertions(+)
>
> diff --git a/EmbeddedPkg/Library/AcpiLib/AcpiLib.inf
> b/EmbeddedPkg/Library/AcpiLib/AcpiLib.inf
> index 538fe09cca29..154cb1eebc80 100644
> --- a/EmbeddedPkg/Library/AcpiLib/AcpiLib.inf
> +++ b/EmbeddedPkg/Library/AcpiLib/AcpiLib.inf
> @@ -23,6 +23,8 @@ [Packages]
> EmbeddedPkg/EmbeddedPkg.dec
>
> [LibraryClasses]
> + BaseLib
> + BaseMemoryLib
> DebugLib
> UefiBootServicesTableLib
>
> diff --git a/EmbeddedPkg/Include/Library/AcpiLib.h
> b/EmbeddedPkg/Include/Library/AcpiLib.h
> index c142446d9d59..cdb6ea410c54 100644
> --- a/EmbeddedPkg/Include/Library/AcpiLib.h
> +++ b/EmbeddedPkg/Include/Library/AcpiLib.h
> @@ -13,6 +13,7 @@
> #include <Uefi.h>
>
> #include <IndustryStandard/Acpi10.h>
> +#include <Protocol/AcpiSystemDescriptionTable.h>
>
> //
> // Macros for the Generic Address Space
> @@ -128,4 +129,71 @@ LocateAndInstallAcpiFromFv (
> IN CONST EFI_GUID* AcpiFile
> );
>
> +/**
> + This function calculates and updates an UINT8 checksum.
> +
> + @param Buffer Pointer to buffer to checksum
> + @param Size Number of bytes to checksum
> +
> + @retval EFI_SUCCESS The function completed successfully.
> + @retval EFI_INVALID_PARAMETER Invalid parameter.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +AcpiUpdateChecksum (
> + IN UINT8 *Buffer,
> + IN UINTN Size
> + );
> +
> +/**
> + This function uses the ACPI SDT protocol to locate an ACPI table
> + with a given signature that only have a single instance.
> +
> + Caution: This function does not act correctly with tables having
> + more than 2 instances like SSDT table.
> +
> + @param AcpiTableSdtProtocol Pointer to ACPI SDT protocol.
> + @param TableSignature ACPI table signature.
> + @param Table Pointer to the table.
> + @param TableKey Pointer to the table key.
> +
> + @return EFI_SUCCESS The function completed successfully.
> + @return EFI_INVALID_PARAMETER At least one of parameters is invalid.
> + @retval EFI_NOT_FOUND The requested index is too large and a
> table was not found.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +AcpiLocateTableBySignature (
> + IN EFI_ACPI_SDT_PROTOCOL *AcpiSdtProtocol,
> + IN UINT32 TableSignature,
> + OUT EFI_ACPI_DESCRIPTION_HEADER **Table,
> + OUT UINTN *TableKey
> + );
> +
> +/**
> + This function updates the integer value of an AML Object.
> +
> + @param AcpiTableSdtProtocol Pointer to ACPI SDT protocol.
> + @param TableHandle Points to the table representing the starting
> point
> + for the object path search.
> + @param AsciiObjectPath Pointer to the ACPI path of the object being
> updated.
> + @param Value New value to write to the object.
> +
> + @return EFI_SUCCESS The function completed successfully.
> + @return EFI_INVALID_PARAMETER At least one of parameters is invalid
> or the data type
> + of the ACPI object is not an integer value.
> + @retval EFI_NOT_FOUND The object is not found with the given path.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +AcpiAmlObjectUpdateInteger (
> + IN EFI_ACPI_SDT_PROTOCOL *AcpiSdtProtocol,
> + IN EFI_ACPI_HANDLE TableHandle,
> + IN CHAR8 *AsciiObjectPath,
> + IN UINTN Value
> + );
> +
> #endif // __ACPI_LIB_H__
> diff --git a/EmbeddedPkg/Library/AcpiLib/AcpiLib.c
> b/EmbeddedPkg/Library/AcpiLib/AcpiLib.c
> index ff7d678433d5..e07919ae323f 100644
> --- a/EmbeddedPkg/Library/AcpiLib/AcpiLib.c
> +++ b/EmbeddedPkg/Library/AcpiLib/AcpiLib.c
> @@ -9,9 +9,12 @@
> #include <Uefi.h>
>
> #include <Library/AcpiLib.h>
> +#include <Library/BaseLib.h>
> +#include <Library/BaseMemoryLib.h>
> #include <Library/DebugLib.h>
> #include <Library/UefiBootServicesTableLib.h>
>
> +#include <Protocol/AcpiSystemDescriptionTable.h>
> #include <Protocol/AcpiTable.h>
> #include <Protocol/FirmwareVolume2.h>
>
> @@ -170,3 +173,183 @@ LocateAndInstallAcpiFromFv (
> {
> return LocateAndInstallAcpiFromFvConditional (AcpiFile, NULL);
> }
> +
> +/**
> + This function calculates and updates an UINT8 checksum.
> +
> + @param Buffer Pointer to buffer to checksum
> + @param Size Number of bytes to checksum
> +
> + @retval EFI_SUCCESS The function completed successfully.
> + @retval EFI_INVALID_PARAMETER Invalid parameter.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +AcpiUpdateChecksum (
> + IN UINT8 *Buffer,
> + IN UINTN Size
> + )
> +{
> + UINTN ChecksumOffset;
> +
> + if (Buffer == NULL || Size == 0) {
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + ChecksumOffset = OFFSET_OF (EFI_ACPI_DESCRIPTION_HEADER,
> Checksum);
> +
> + //
> + // Set checksum to 0 first
> + //
> + Buffer[ChecksumOffset] = 0;
> +
> + //
> + // Update checksum value
> + //
> + Buffer[ChecksumOffset] = CalculateCheckSum8 (Buffer, Size);
> +
> + return EFI_SUCCESS;
> +}
> +
> +/**
> + This function uses the ACPI SDT protocol to locate an ACPI table
> + with a given signature that only have a single instance.
> +
> + Caution: This function does not act correctly with tables having
> + more than 2 instances like SSDT table.
Instead of having this caution, why not returning an array of table pointers and TableKeys, also another new parameter indicates how many tables are matched to the signature?
How to use the array depends on the caller.
> +
> + @param AcpiTableSdtProtocol Pointer to ACPI SDT protocol.
> + @param TableSignature ACPI table signature.
> + @param Table Pointer to the table.
> + @param TableKey Pointer to the table key.
> +
> + @return EFI_SUCCESS The function completed successfully.
> + @return EFI_INVALID_PARAMETER At least one of parameters is invalid.
> + @retval EFI_NOT_FOUND The requested index is too large and a
> table was not found.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +AcpiLocateTableBySignature (
> + IN EFI_ACPI_SDT_PROTOCOL *AcpiSdtProtocol,
> + IN UINT32 TableSignature,
> + OUT EFI_ACPI_DESCRIPTION_HEADER **Table,
> + OUT UINTN *TableKey
> + )
> +{
> + EFI_STATUS Status;
> + EFI_ACPI_SDT_HEADER *TempTable;
> + EFI_ACPI_TABLE_VERSION TableVersion;
> + UINTN TableIndex;
> +
> + if (AcpiSdtProtocol == NULL
> + || Table == NULL
> + || TableKey == NULL) {
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + Status = EFI_SUCCESS;
> +
> + //
> + // Search for ACPI Table with matching signature
> + //
> + TableVersion = 0;
> + TableIndex = 0;
> + while (!EFI_ERROR (Status)) {
> + Status = AcpiSdtProtocol->GetAcpiTable (
> + TableIndex,
> + &TempTable,
> + &TableVersion,
> + TableKey
> + );
> + if (!EFI_ERROR (Status)) {
> + TableIndex++;
> +
> + if (((EFI_ACPI_DESCRIPTION_HEADER *)TempTable)->Signature ==
> TableSignature) {
> + *Table = (EFI_ACPI_DESCRIPTION_HEADER *)TempTable;
> + break;
> + }
> + }
> + }
> +
> + return Status;
> +}
> +
> +/**
> + This function updates the integer value of an AML Object.
> +
> + @param AcpiTableSdtProtocol Pointer to ACPI SDT protocol.
> + @param TableHandle Points to the table representing the starting
> point
> + for the object path search.
> + @param AsciiObjectPath Pointer to the ACPI path of the object being
> updated.
> + @param Value New value to write to the object.
> +
> + @return EFI_SUCCESS The function completed successfully.
> + @return EFI_INVALID_PARAMETER At least one of parameters is invalid
> or the data type
> + of the ACPI object is not an integer value.
> + @retval EFI_NOT_FOUND The object is not found with the given path.
> +
> +**/
> +EFI_STATUS
> +EFIAPI
> +AcpiAmlObjectUpdateInteger (
> + IN EFI_ACPI_SDT_PROTOCOL *AcpiSdtProtocol,
> + IN EFI_ACPI_HANDLE TableHandle,
> + IN CHAR8 *AsciiObjectPath,
> + IN UINTN Value
> + )
> +{
> + EFI_STATUS Status;
> + EFI_ACPI_HANDLE ObjectHandle;
> + EFI_ACPI_DATA_TYPE DataType;
> + UINT8 *Buffer;
> + UINTN BufferSize;
> +
> + if (AcpiSdtProtocol == NULL || AsciiObjectPath == NULL) {
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + Status = AcpiSdtProtocol->FindPath (TableHandle, AsciiObjectPath,
> &ObjectHandle);
> + if (EFI_ERROR (Status)) {
> + return Status;
> + }
> +
> + Status = AcpiSdtProtocol->GetOption (ObjectHandle, 0, &DataType, (VOID
We can use AML_OP_PARSE_INDEX_GET_OPCODE instead of '0', which is more readable.
> *)&Buffer, &BufferSize);
> + if (EFI_ERROR (Status)) {
> + return Status;
> + }
> +
> + if (Buffer[0] != AML_NAME_OP) {
> + return EFI_NOT_FOUND;
> + }
> +
> + switch (Buffer[5]) {
After getting the opcode from ACPI handle, the BufferSize suppose is in value of 1 or 2 if I interpret the code correctly. You can access to Buffer[5] because the buffer points the AML node.
Below can be executed correctly but seems to me not quite proper. Furthermore, can we leverage AcpiSdtProtocol ->SetOpion for updating value instead of having below code block?
Abner
> + case AML_ZERO_OP:
> + case AML_ONE_OP:
> + Buffer[5] = (UINT8)Value;
> + break;
> +
> + case AML_BYTE_PREFIX:
> + Buffer[6] = (UINT8)Value;
> + break;
> +
> + case AML_WORD_PREFIX:
> + CopyMem ((VOID *)&Buffer[6], (VOID *)&Buffer, sizeof (UINT16));
> + break;
> +
> + case AML_DWORD_PREFIX:
> + CopyMem ((VOID *)&Buffer[6], (VOID *)&Buffer, sizeof (UINT32));
> + break;
> +
> + case AML_QWORD_PREFIX:
> + CopyMem ((VOID *)&Buffer[6], (VOID *)&Buffer, sizeof (UINT64));
> + break;
> +
> + default:
> + // The data type of the ACPI object is not an integer value.
> + return EFI_INVALID_PARAMETER;
> + }
> +
> + return Status;
> +}
> --
> 2.17.1
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