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/** @file
AGDI table parser
Copyright (c) 2025, Arm Limited. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- ACPI for the Arm Components 1.2 EAC1 Platform Design Document,
dated July 2025.
(https://developer.arm.com/documentation/den0093/1-2eac1/)
**/
#include <IndustryStandard/ArmAgdiTable.h>
#include <Library/PrintLib.h>
#include <Library/UefiLib.h>
#include "AcpiParser.h"
#include "AcpiView.h"
#include "AcpiViewConfig.h"
STATIC ACPI_DESCRIPTION_HEADER_INFO mAcpiHdrInfo;
/**
Validate Signaling Mode Value.
@param [in] Ptr Pointer to the start of the field data.
@param [in] Length Length of the field.
@param [in] Context Pointer to context specific information e.g. this
could be a pointer to the ACPI table header.
**/
STATIC
VOID
EFIAPI
ValidateSignalingFlags (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
if (*Ptr >= ArmAgdiSignalingModeInval) {
IncrementErrorCount ();
Print (L"\nERROR: Signaling Flags must be either 0, 1 or 2");
}
}
/**
Validate that the Reserved field has expected value.
@param [in] Ptr Pointer to the start of the field data.
@param [in] Length Length of the field.
@param [in] Context Pointer to context specific information e.g. this
could be a pointer to the ACPI table header.
**/
STATIC
VOID
EFIAPI
ValidateResField (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
if (*Ptr != 0) {
IncrementErrorCount ();
Print (L"\nERROR: Reserved bits in Flags must be 0");
}
}
/**
An ACPI_PARSER array describing the AGDI Signaling Mode Flags field.
**/
STATIC CONST ACPI_PARSER AgdiSignalingModeFlags[] = {
{ L"Signaling Mode", 2, 0, L"%u", NULL, NULL, ValidateSignalingFlags, NULL },
{ L"Reserved", 6, 2, L"%u", NULL, NULL, ValidateResField, NULL },
};
/**
This function dumps the signaling mode flags field.
If no format string is specified the Format must be NULL.
@param [in] Format Optional format string for tracing the data.
@param [in] Ptr Pointer to the start of the buffer.
@param [in] Length Length of the field.
**/
STATIC
VOID
EFIAPI
DumpSignalingFlags (
IN CONST CHAR16 *Format OPTIONAL,
IN UINT8 *Ptr,
IN UINT32 Length
)
{
if (Format != NULL) {
Print (Format, *(UINT32 *)Ptr);
return;
}
Print (L"0x%x\n", *Ptr);
ParseAcpiBitFields (
TRUE,
2,
NULL,
Ptr,
1,
PARSER_PARAMS (AgdiSignalingModeFlags)
);
}
/**
An ACPI_PARSER array describing the ACPI AGDI Table.
**/
STATIC CONST ACPI_PARSER AgdiParser[] = {
PARSE_ACPI_HEADER (&mAcpiHdrInfo),
{ L"Signaling mode Flags", 1, 36, NULL, DumpSignalingFlags, NULL, NULL, NULL },
{ L"Reserved", 3, 37, L"0x%x 0x%x 0x%x", Dump3Chars, NULL, NULL, NULL },
{ L"Sdei Event Number", 4, 40, L"0x%x", NULL, NULL, NULL, NULL },
{ L"GSIV", 4, 44, L"0x%x", NULL, NULL, NULL, NULL },
};
/**
This function parses the ACPI AGDI table.
When trace is enabled this function parses the AGDI table and
traces the ACPI table fields.
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
ParseAcpiAgdi (
IN BOOLEAN Trace,
IN UINT8 *Ptr,
IN UINT32 AcpiTableLength,
IN UINT8 AcpiTableRevision
)
{
if (!Trace) {
return;
}
// Parse ACPI Header + RASF "fixed" fields
ParseAcpi (
Trace,
0,
"AGDI",
Ptr,
AcpiTableLength,
PARSER_PARAMS (AgdiParser)
);
}
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