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/** @file
ACPI table parser
Copyright (c) 2016 - 2020, ARM Limited. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <IndustryStandard/Acpi.h>
#include <Library/UefiLib.h>
#include "AcpiParser.h"
#include "AcpiTableParser.h"
#include "AcpiView.h"
/**
A list of registered ACPI table parsers.
**/
STATIC ACPI_TABLE_PARSER mTableParserList[MAX_ACPI_TABLE_PARSERS];
/**
Register the ACPI table Parser
This function registers the ACPI table parser.
@param [in] Signature The ACPI table signature.
@param [in] ParserProc The ACPI table parser.
@retval EFI_SUCCESS The parser is registered.
@retval EFI_INVALID_PARAMETER A parameter is invalid.
@retval EFI_ALREADY_STARTED The parser for the Table
was already registered.
@retval EFI_OUT_OF_RESOURCES No space to register the
parser.
**/
EFI_STATUS
EFIAPI
RegisterParser (
IN UINT32 Signature,
IN PARSE_ACPI_TABLE_PROC ParserProc
)
{
UINT32 Index;
if ((ParserProc == NULL) || (Signature == ACPI_PARSER_SIGNATURE_NULL)) {
return EFI_INVALID_PARAMETER;
}
// Search if a parser is already installed
for (Index = 0;
Index < (sizeof (mTableParserList) / sizeof (mTableParserList[0]));
Index++)
{
if (Signature == mTableParserList[Index].Signature) {
if (mTableParserList[Index].Parser != NULL) {
return EFI_ALREADY_STARTED;
}
}
}
// Find the first free slot and register the parser
for (Index = 0;
Index < (sizeof (mTableParserList) / sizeof (mTableParserList[0]));
Index++)
{
if (mTableParserList[Index].Signature == ACPI_PARSER_SIGNATURE_NULL) {
mTableParserList[Index].Signature = Signature;
mTableParserList[Index].Parser = ParserProc;
return EFI_SUCCESS;
}
}
// No free slot found
return EFI_OUT_OF_RESOURCES;
}
/**
Deregister the ACPI table Parser
This function deregisters the ACPI table parser.
@param [in] Signature The ACPI table signature.
@retval EFI_SUCCESS The parser was deregistered.
@retval EFI_INVALID_PARAMETER A parameter is invalid.
@retval EFI_NOT_FOUND A registered parser was not found.
**/
EFI_STATUS
EFIAPI
DeregisterParser (
IN UINT32 Signature
)
{
UINT32 Index;
if (Signature == ACPI_PARSER_SIGNATURE_NULL) {
return EFI_INVALID_PARAMETER;
}
for (Index = 0;
Index < (sizeof (mTableParserList) / sizeof (mTableParserList[0]));
Index++)
{
if (Signature == mTableParserList[Index].Signature) {
mTableParserList[Index].Signature = ACPI_PARSER_SIGNATURE_NULL;
mTableParserList[Index].Parser = NULL;
return EFI_SUCCESS;
}
}
// No matching registered parser found.
return EFI_NOT_FOUND;
}
/**
Get the ACPI table Parser
This function returns the ACPI table parser proc from the list of
registered parsers.
@param [in] Signature The ACPI table signature.
@param [out] ParserProc Pointer to a ACPI table parser proc.
@retval EFI_SUCCESS The parser was returned successfully.
@retval EFI_INVALID_PARAMETER A parameter is invalid.
@retval EFI_NOT_FOUND A registered parser was not found.
**/
EFI_STATUS
EFIAPI
GetParser (
IN UINT32 Signature,
OUT PARSE_ACPI_TABLE_PROC * ParserProc
)
{
UINT32 Index;
if ((ParserProc == NULL) || (Signature == ACPI_PARSER_SIGNATURE_NULL)) {
return EFI_INVALID_PARAMETER;
}
for (Index = 0;
Index < (sizeof (mTableParserList) / sizeof (mTableParserList[0]));
Index++)
{
if (Signature == mTableParserList[Index].Signature) {
*ParserProc = mTableParserList[Index].Parser;
return EFI_SUCCESS;
}
}
// No matching registered parser found.
return EFI_NOT_FOUND;
}
/**
This function processes the ACPI tables.
This function calls ProcessTableReportOptions() to list the ACPI
tables, perform binary dump of the tables and determine if the
ACPI fields should be traced.
This function also invokes the parser for the ACPI tables.
This function also performs a RAW dump of the ACPI table including
the unknown/unparsed ACPI tables and validates the checksum.
@param [in] Ptr Pointer to the start of the ACPI
table data buffer.
**/
VOID
EFIAPI
ProcessAcpiTable (
IN UINT8* Ptr
)
{
EFI_STATUS Status;
BOOLEAN Trace;
CONST UINT32* AcpiTableSignature;
CONST UINT32* AcpiTableLength;
CONST UINT8* AcpiTableRevision;
CONST UINT8* SignaturePtr;
PARSE_ACPI_TABLE_PROC ParserProc;
ParseAcpiHeader (
Ptr,
&AcpiTableSignature,
&AcpiTableLength,
&AcpiTableRevision
);
Trace = ProcessTableReportOptions (
*AcpiTableSignature,
Ptr,
*AcpiTableLength
);
if (Trace) {
DumpRaw (Ptr, *AcpiTableLength);
// Do not process the ACPI table any further if the table length read
// is invalid. The ACPI table should at least contain the table header.
if (*AcpiTableLength < sizeof (EFI_ACPI_DESCRIPTION_HEADER)) {
SignaturePtr = (CONST UINT8*)AcpiTableSignature;
IncrementErrorCount ();
Print (
L"ERROR: Invalid %c%c%c%c table length. Length = %d\n",
SignaturePtr[0],
SignaturePtr[1],
SignaturePtr[2],
SignaturePtr[3],
*AcpiTableLength
);
return;
}
if (GetConsistencyChecking ()) {
VerifyChecksum (TRUE, Ptr, *AcpiTableLength);
}
}
Status = GetParser (*AcpiTableSignature, &ParserProc);
if (EFI_ERROR (Status)) {
// No registered parser found, do default handling.
if (Trace) {
DumpAcpiHeader (Ptr);
}
return;
}
ParserProc (
Trace,
Ptr,
*AcpiTableLength,
*AcpiTableRevision
);
}
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