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/** @file
RSDP table parser
Copyright (c) 2016 - 2019, ARM Limited. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- ACPI 6.2 Specification - Errata A, September 2017
**/
#include <Library/UefiLib.h>
#include "AcpiParser.h"
#include "AcpiTableParser.h"
// Local Variables
STATIC CONST UINT64* XsdtAddress;
/**
This function validates the RSDT Address.
@param [in] Ptr Pointer to the start of the field data.
@param [in] Context Pointer to context specific information e.g. this
could be a pointer to the ACPI table header.
**/
STATIC
VOID
EFIAPI
ValidateRsdtAddress (
IN UINT8* Ptr,
IN VOID* Context
)
{
#if defined(MDE_CPU_ARM) || defined (MDE_CPU_AARCH64)
// Reference: Server Base Boot Requirements System Software on ARM Platforms
// Section: 4.2.1.1 RSDP
// Root System Description Pointer (RSDP), ACPI ? 5.2.5.
// - Within the RSDP, the RsdtAddress field must be null (zero) and the
// XsdtAddresss MUST be a valid, non-null, 64-bit value.
UINT32 RsdtAddr;
RsdtAddr = *(UINT32*)Ptr;
if (RsdtAddr != 0) {
IncrementErrorCount ();
Print (
L"\nERROR: Rsdt Address = 0x%p. This must be NULL on ARM Platforms.",
RsdtAddr
);
}
#endif
}
/**
This function validates the XSDT Address.
@param [in] Ptr Pointer to the start of the field data.
@param [in] Context Pointer to context specific information e.g. this
could be a pointer to the ACPI table header.
**/
STATIC
VOID
EFIAPI
ValidateXsdtAddress (
IN UINT8* Ptr,
IN VOID* Context
)
{
#if defined(MDE_CPU_ARM) || defined (MDE_CPU_AARCH64)
// Reference: Server Base Boot Requirements System Software on ARM Platforms
// Section: 4.2.1.1 RSDP
// Root System Description Pointer (RSDP), ACPI ? 5.2.5.
// - Within the RSDP, the RsdtAddress field must be null (zero) and the
// XsdtAddresss MUST be a valid, non-null, 64-bit value.
UINT64 XsdtAddr;
XsdtAddr = *(UINT64*)Ptr;
if (XsdtAddr == 0) {
IncrementErrorCount ();
Print (
L"\nERROR: Xsdt Address = 0x%p. This must not be NULL on ARM Platforms.",
XsdtAddr
);
}
#endif
}
/**
An array describing the ACPI RSDP Table.
**/
STATIC CONST ACPI_PARSER RsdpParser[] = {
{L"Signature", 8, 0, NULL, Dump8Chars, NULL, NULL, NULL},
{L"Checksum", 1, 8, L"0x%x", NULL, NULL, NULL, NULL},
{L"Oem ID", 6, 9, NULL, Dump6Chars, NULL, NULL, NULL},
{L"Revision", 1, 15, L"%d", NULL, NULL, NULL, NULL},
{L"RSDT Address", 4, 16, L"0x%x", NULL, NULL, ValidateRsdtAddress, NULL},
{L"Length", 4, 20, L"%d", NULL, NULL, NULL, NULL},
{L"XSDT Address", 8, 24, L"0x%lx", NULL, (VOID**)&XsdtAddress,
ValidateXsdtAddress, NULL},
{L"Extended Checksum", 1, 32, L"0x%x", NULL, NULL, NULL, NULL},
{L"Reserved", 3, 33, L"%x %x %x", Dump3Chars, NULL, NULL, NULL}
};
/**
This function parses the ACPI RSDP table.
This function invokes the parser for the XSDT table.
* Note - This function does not support parsing of RSDT table.
This function also performs a RAW dump of the ACPI table and
validates the checksum.
@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
ParseAcpiRsdp (
IN BOOLEAN Trace,
IN UINT8* Ptr,
IN UINT32 AcpiTableLength,
IN UINT8 AcpiTableRevision
)
{
if (Trace) {
DumpRaw (Ptr, AcpiTableLength);
VerifyChecksum (TRUE, Ptr, AcpiTableLength);
}
ParseAcpi (Trace, 0, "RSDP", Ptr, AcpiTableLength, PARSER_PARAMS (RsdpParser));
// This code currently supports parsing of XSDT table only
// and does not parse the RSDT table. Platforms provide the
// RSDT to enable compatibility with ACPI 1.0 operating systems.
// Therefore the RSDT should not be used on ARM platforms.
if ((*XsdtAddress) == 0) {
IncrementErrorCount ();
Print (L"ERROR: XSDT Pointer is not set.\n");
return;
}
ProcessAcpiTable ((UINT8*)(UINTN)(*XsdtAddress));
}
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