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/** @file
HPET table parser
Copyright (C) 2024 Advanced Micro Devices, Inc. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- HPET spec, version 1.0a
**/
#include <Library/UefiLib.h>
#include "AcpiParser.h"
STATIC ACPI_DESCRIPTION_HEADER_INFO AcpiHdrInfo;
/**
This function prints HPET page protection flags.
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.
**/
VOID
EFIAPI
DumpHpetPageProtectionFlag (
IN CONST CHAR16 *Format OPTIONAL,
IN UINT8 *Ptr
)
{
if (Format != NULL) {
Print (Format, *(UINT8 *)Ptr);
return;
}
Print (L"0x%X ", *(UINT8 *)Ptr);
switch (*Ptr) {
case 0:
Print (L"(no guarantee for page protection)");
break;
case 1:
Print (L"(4K page protection)");
break;
case 2:
Print (L"(64K page protection)");
break;
default:
IncrementErrorCount ();
Print (L"(OEM Reserved)");
break;
}
return;
}
/**
An ACPI_PARSER array describing the ACPI HPET flags.
**/
STATIC CONST ACPI_PARSER DumpHpetFlagParser[] = {
{ L"Page Protection Flag", 4, 0, NULL, DumpHpetPageProtectionFlag, NULL, NULL, NULL },
{ L"OEM Attributes", 4, 4, L"0x%x", NULL, NULL, NULL, NULL }
};
/**
This function prints HPET Flags fields.
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.
**/
VOID
EFIAPI
DumpHpetFlag (
IN CONST CHAR16 *Format OPTIONAL,
IN UINT8 *Ptr
)
{
if (Format != NULL) {
Print (Format, *(UINT8 *)Ptr);
return;
}
Print (L"0x%X\n", *(UINT8 *)Ptr);
ParseAcpiBitFields (
TRUE,
2,
NULL,
Ptr,
4,
PARSER_PARAMS (DumpHpetFlagParser)
);
}
/**
This function prints HPET Counter size fields.
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.
**/
VOID
EFIAPI
DumpCounterSize (
IN CONST CHAR16 *Format OPTIONAL,
IN UINT8 *Ptr
)
{
if (Format != NULL) {
Print (Format, *(UINT32 *)Ptr);
return;
}
Print (L"0x%X ", *(UINT32 *)Ptr);
if (*Ptr == 0) {
Print (L"(Max 32-bit counter size)");
} else {
Print (L"(Max 64-bit counter size)");
}
}
/**
This function validates the flags.
@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
ValidateHpetRevId (
IN UINT8 *Ptr,
IN VOID *Context
)
{
if ((*(UINT8 *)Ptr) == 0) {
IncrementErrorCount ();
Print (
L"\nERROR: HPET Hardware Rev ID must be set."
);
}
}
/**
An ACPI_PARSER array describing the ACPI HPET Event Timer Block ID.
**/
STATIC CONST ACPI_PARSER HpetEventTimerBlockIdFlagParser[] = {
{ L"Hardware Rev ID", 8, 0, L"0x%x", NULL, NULL, ValidateHpetRevId, NULL },
{ L"Comparators in 1st Timer Block", 5, 8, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Counter max size", 1, 13, NULL, DumpCounterSize, NULL, NULL, NULL },
{ L"Reserved", 1, 14, L"%d", NULL, NULL, NULL, NULL },
{ L"LegacyReplacement IRQ Routing", 1, 15, L"%d", NULL, NULL, NULL, NULL },
{ L"PCI Vendor ID of 1st Timer Block", 16, 16, L"0x%x", NULL, NULL, NULL, NULL }
};
/**
This function prints Hardware ID of HPET Event timer block.
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.
**/
VOID
EFIAPI
DumpHpetEventTimerBlockId (
IN CONST CHAR16 *Format OPTIONAL,
IN UINT8 *Ptr
)
{
if (Format != NULL) {
Print (Format, *(UINT32 *)Ptr);
return;
}
Print (L"0x%X\n", *(UINT32 *)Ptr);
ParseAcpiBitFields (
TRUE,
2,
NULL,
Ptr,
4,
PARSER_PARAMS (HpetEventTimerBlockIdFlagParser)
);
}
/**
An ACPI_PARSER array describing the ACPI HPET Table.
**/
STATIC CONST ACPI_PARSER HpetParser[] = {
PARSE_ACPI_HEADER (&AcpiHdrInfo),
{ L"Event Timer Block ID", 4, 36, NULL, DumpHpetEventTimerBlockId, NULL, NULL, NULL },
{ L"Base Address", 12, 40, NULL, DumpGas, NULL, NULL, NULL },
{ L"HPET Number", 1, 52, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Minimum Clock Ticks", 2, 53, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Page Protection and OEM Attributes",1, 55, NULL, DumpHpetFlag, NULL, NULL, NULL }
};
/**
This function parses the ACPI HPET table.
@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
ParseAcpiHpet (
IN BOOLEAN Trace,
IN UINT8 *Ptr,
IN UINT32 AcpiTableLength,
IN UINT8 AcpiTableRevision
)
{
ParseAcpi (
Trace,
0,
"HPET",
Ptr,
AcpiTableLength,
PARSER_PARAMS (HpetParser)
);
}
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