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/** @file
RAS2 table parser
Copyright (c) 2024, Arm Limited. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- ACPI 6.5 Specification - August 2022
**/
#include <Library/PrintLib.h>
#include <Library/BaseLib.h>
#include <Library/UefiLib.h>
#include "AcpiParser.h"
#include "AcpiView.h"
// Local variables
STATIC CONST UINT16 *Ras2PccDescriptors;
STATIC ACPI_DESCRIPTION_HEADER_INFO AcpiHdrInfo;
/**
An ACPI_PARSER array describing the ACPI RAS2 Table.
*/
STATIC CONST ACPI_PARSER Ras2Parser[] = {
PARSE_ACPI_HEADER (&AcpiHdrInfo),
{ L"Reserved", 2, 36, L"0x%x", NULL, NULL, NULL, NULL },
{ L"PCC Descriptors", 2, 38, L"%d", NULL, (VOID **)&Ras2PccDescriptors, NULL, NULL }
};
/**
An ACPI_PARSER array describing the RAS2 PCC ID Entry
*/
STATIC CONST ACPI_PARSER Ras2StructurePccDescriptor[] = {
{ L"PCC ID", 1, 0, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Reserved", 1, 1, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Reserved", 1, 2, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Feature Type", 1, 3, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Instance", 4, 4, L"0x%x", NULL, NULL, NULL, NULL }
};
STATIC
VOID
DumpPccEntry (
IN UINT8 *Ptr,
IN UINT32 Length
)
{
ParseAcpi (
TRUE,
2,
"PCC Descriptor Entry",
Ptr,
Length,
PARSER_PARAMS (Ras2StructurePccDescriptor)
);
}
/**
This function parses the ACPI RAS2 table.
When trace is enabled this function parses the RAS2 table and
traces the ACPI table fields.
This function parses the following RAS2 structures:
- Pcc Instries
- Entry Pcc ID
- Entry Feature Type
- Entry Pcc Instance
This function also performs validation of the ACPI table fields.
@param [in] Trace If TRUE, trace the ACPI fields.
@param [in] Ptr Pointer to the start of the buffer.
@param [in] AcpiTableLength Length of the ACPI table.
@param [in] AcpiTableRevision Revision of the ACPI table.
**/
VOID
EFIAPI
ParseAcpiRas2 (
IN BOOLEAN Trace,
IN UINT8 *Ptr,
IN UINT32 AcpiTableLength,
IN UINT8 AcpiTableRevision
)
{
UINT32 Offset;
UINT16 Count = 0;
CONST CHAR16 *Message;
if (!Trace) {
return;
}
// Parse ACPI Header + RAS2 "fixed" fields
Offset = ParseAcpi (
Trace,
0,
"RAS2",
Ptr,
AcpiTableLength,
PARSER_PARAMS (Ras2Parser)
);
// Table is too small to contain data
if (Offset >= AcpiTableLength) {
return;
}
// Loop over rest of table for PCC Entries and dump them
while (Offset <= (AcpiTableLength - sizeof (EFI_ACPI_RAS2_PCC_DESCRIPTOR))) {
DumpPccEntry (
Ptr + Offset,
sizeof (EFI_ACPI_RAS2_PCC_DESCRIPTOR)
);
Offset += sizeof (EFI_ACPI_RAS2_PCC_DESCRIPTOR);
Count++;
} // while
// Check counts match and print error if not
if (Count != *Ras2PccDescriptors) {
Message = Count > *Ras2PccDescriptors ? L"many" : L"few";
IncrementWarningCount ();
Print (
L"\nWARNING: Too %s descriptors provided (advertised %d, provided %d)",
Message,
*Ras2PccDescriptors,
Count
);
}
}
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