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|
/** @file
PCCT table parser
Copyright (c) 2021 - 2024, Arm Limited. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- ACPI 6.4 Specification - January 2021
**/
#include <Library/BaseMemoryLib.h>
#include <Library/PrintLib.h>
#include <Library/UefiLib.h>
#include "AcpiParser.h"
#include "AcpiView.h"
#include "AcpiViewConfig.h"
#include "PcctParser.h"
// Local variables
STATIC ACPI_DESCRIPTION_HEADER_INFO AcpiHdrInfo;
STATIC UINT32 *PccGlobalFlags;
STATIC UINT8 *PccSubspaceLength;
STATIC UINT8 *PccSubspaceType;
STATIC UINT8 *ExtendedPccSubspaceInterruptFlags;
/**
This function validates the length coded on 4 bytes of a shared memory range
@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
ValidateRangeLength4 (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
if (*(UINT32 *)Ptr < MIN_EXT_PCC_SUBSPACE_MEM_RANGE_LEN) {
IncrementErrorCount ();
Print (
L"\nError: Shared memory range length is too short.\n"
L"Length is %u when it should be greater than or equal to %u",
*(UINT32 *)Ptr,
MIN_EXT_PCC_SUBSPACE_MEM_RANGE_LEN
);
}
}
/**
This function validates the length coded on 8 bytes of a shared memory range
@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
ValidateRangeLength8 (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
if (*(UINT64 *)Ptr <= MIN_MEMORY_RANGE_LENGTH) {
IncrementErrorCount ();
Print (
L"\nError: Shared memory range length is too short.\n"
L"Length is %u when it should be greater than %u",
*(UINT64 *)Ptr,
MIN_MEMORY_RANGE_LENGTH
);
}
}
/**
This function validates address space for Memory/IO GAS.
@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
ValidatePccMemoryIoGas (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
switch (*(UINT8 *)Ptr) {
#if !(defined (MDE_CPU_ARM) || defined (MDE_CPU_AARCH64))
case EFI_ACPI_6_4_SYSTEM_IO:
#endif //if not (defined (MDE_CPU_ARM) || defined (MDE_CPU_AARCH64))
case EFI_ACPI_6_4_SYSTEM_MEMORY:
return;
default:
IncrementErrorCount ();
Print (L"\nError: Invalid address space");
}
}
/**
This function validates address space for structures of types other than 0.
@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
ValidatePccGas (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
switch (*(UINT8 *)Ptr) {
#if !(defined (MDE_CPU_ARM) || defined (MDE_CPU_AARCH64))
case EFI_ACPI_6_4_SYSTEM_IO:
#endif //if not (defined (MDE_CPU_ARM) || defined (MDE_CPU_AARCH64))
case EFI_ACPI_6_4_FUNCTIONAL_FIXED_HARDWARE:
case EFI_ACPI_6_4_SYSTEM_MEMORY:
return;
default:
IncrementErrorCount ();
Print (L"\nError: Invalid address space");
}
}
/**
This function validates doorbell address space for type 4 structure.
@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
ValidatePccDoorbellGas (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
// For responder subspaces this field is optional, if not present the field
// should just contain zeros.
if (*PccSubspaceType == EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_4_EXTENDED_PCC) {
if (IsZeroBuffer (
Ptr,
sizeof (EFI_ACPI_6_4_GENERIC_ADDRESS_STRUCTURE)
))
{
return;
}
}
ValidatePccGas (Ptr, Length, Context);
}
/**
This function validates interrupt acknowledge address space for
type 4 structure.
@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
ValidatePccIntAckGas (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
// If the subspace does not support interrupts or the interrupt is
// edge driven the register may be omitted. A value of 0x0 on all
// 12 bytes of the GAS structure indicates the register is not
// present.
if (((*PccGlobalFlags & EFI_ACPI_6_4_PCCT_FLAGS_PLATFORM_INTERRUPT) !=
EFI_ACPI_6_4_PCCT_FLAGS_PLATFORM_INTERRUPT) ||
((*ExtendedPccSubspaceInterruptFlags &
EFI_ACPI_6_4_PCCT_SUBSPACE_PLATFORM_INTERRUPT_FLAGS_MODE) ==
EFI_ACPI_6_4_PCCT_SUBSPACE_PLATFORM_INTERRUPT_FLAGS_MODE))
{
if (IsZeroBuffer (
Ptr,
sizeof (EFI_ACPI_6_4_GENERIC_ADDRESS_STRUCTURE)
))
{
return;
}
}
ValidatePccGas (Ptr, Length, Context);
}
/**
This function validates error status address space for type 4 structure.
@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
ValidatePccErrStatusGas (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
// This field is ignored by the OSPM on responder channels.
if (*PccSubspaceType == EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_4_EXTENDED_PCC) {
return;
}
ValidatePccGas (Ptr, Length, Context);
}
/**
This function validates platform interrupt flags for type 4 structure.
@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
ValidatePlatInterrupt (
IN UINT8 *Ptr,
IN UINT32 Length,
IN VOID *Context
)
{
// If a responder subspace is present in the PCCT, then the global Platform
// Interrupt flag must be set to 1.
if ((*PccSubspaceType == EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_4_EXTENDED_PCC) &&
((*PccGlobalFlags & EFI_ACPI_6_4_PCCT_FLAGS_PLATFORM_INTERRUPT) !=
EFI_ACPI_6_4_PCCT_FLAGS_PLATFORM_INTERRUPT))
{
IncrementErrorCount ();
Print (
L"\nError: Global Platform interrupt flag must be set to 1" \
L" if a PCC type 4 structure is present in PCCT."
);
}
}
/**
An ACPI_PARSER array describing the ACPI PCCT Table.
*/
STATIC CONST ACPI_PARSER PcctParser[] = {
PARSE_ACPI_HEADER (&AcpiHdrInfo),
{ L"Flags", 4, 36, NULL, NULL, (VOID **)&PccGlobalFlags, NULL, NULL },
{ L"Reserved", 8, 40, NULL, NULL, NULL, NULL, NULL }
};
/**
An ACPI_PARSER array describing the platform communications channel subspace
structure header.
*/
STATIC CONST ACPI_PARSER PccSubspaceHeaderParser[] = {
PCC_SUBSPACE_HEADER ()
// ... Type Specific Fields ...
};
/**
An ACPI_PARSER array describing the Generic Communications Subspace - Type 0
*/
STATIC CONST ACPI_PARSER PccSubspaceType0Parser[] = {
PCC_SUBSPACE_HEADER (),
{ L"Reserved", 6, 2, L"%x %x %x %x %x %x", Dump6Chars, NULL, NULL, NULL },
{ L"Base Address", 8, 8, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Memory Range Length",8, 16, L"0x%lx", NULL, NULL, ValidateRangeLength8,
NULL },
{ L"Doorbell Register",12, 24, NULL, DumpGas, NULL, ValidatePccMemoryIoGas,
NULL },
{ L"Doorbell Preserve",8, 36, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Doorbell Write", 8, 44, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Nominal Latency", 4, 52, L"%u", NULL, NULL, NULL, NULL },
{ L"Maximum Periodic Access Rate",4, 56, L"%u", NULL, NULL, NULL, NULL },
{ L"Minimum Request Turnaround Time",2, 60, L"%u", NULL, NULL, NULL, NULL }
};
/**
An ACPI_PARSER array describing the HW-Reduced Communications Subspace
- Type 1
*/
STATIC CONST ACPI_PARSER PccSubspaceType1Parser[] = {
PCC_SUBSPACE_HEADER (),
{ L"Platform Interrupt",4, 2, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Platform Interrupt Flags",1, 6, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Reserved", 1, 7, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Base Address", 8, 8, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Memory Range Length",8, 16, L"0x%lx", NULL, NULL, ValidateRangeLength8,
NULL },
{ L"Doorbell Register",12, 24, NULL, DumpGas, NULL,
ValidatePccGas, NULL },
{ L"Doorbell Preserve",8, 36, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Doorbell Write", 8, 44, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Nominal Latency", 4, 52, L"%u", NULL, NULL, NULL, NULL },
{ L"Maximum Periodic Access Rate",4, 56, L"%u", NULL, NULL, NULL, NULL },
{ L"Minimum Request Turnaround Time",2, 60, L"%u", NULL, NULL, NULL, NULL }
};
/**
An ACPI_PARSER array describing the HW-Reduced Communications Subspace
- Type 2
*/
STATIC CONST ACPI_PARSER PccSubspaceType2Parser[] = {
PCC_SUBSPACE_HEADER (),
{ L"Platform Interrupt",4, 2, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Platform Interrupt Flags",1, 6, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Reserved", 1, 7, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Base Address", 8, 8, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Memory Range Length",8, 16, L"0x%lx", NULL, NULL, ValidateRangeLength8,
NULL },
{ L"Doorbell Register",12, 24, NULL, DumpGas, NULL,
ValidatePccGas, NULL },
{ L"Doorbell Preserve",8, 36, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Doorbell Write", 8, 44, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Nominal Latency", 4, 52, L"%u", NULL, NULL, NULL, NULL },
{ L"Maximum Periodic Access Rate",4, 56, L"%u", NULL, NULL, NULL, NULL },
{ L"Minimum Request Turnaround Time",2, 60, L"%u", NULL, NULL, NULL, NULL },
{ L"Platform Interrupt Ack Register",12, 62, NULL, DumpGas, NULL,
ValidatePccGas, NULL },
{ L"Platform Interrupt Ack Preserve",8, 74, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Platform Interrupt Ack Write",8, 82, L"0x%lx", NULL, NULL,
NULL, NULL },
};
/**
An ACPI_PARSER array describing the Extended PCC Subspaces - Type 3/4
*/
STATIC CONST ACPI_PARSER PccSubspaceType3Parser[] = {
PCC_SUBSPACE_HEADER (),
{ L"Platform Interrupt", 4, 2, L"0x%x", NULL, NULL,
ValidatePlatInterrupt, NULL },
{ L"Platform Interrupt Flags", 1, 6, L"0x%x", NULL,
(VOID **)&ExtendedPccSubspaceInterruptFlags,NULL, NULL },
{ L"Reserved", 1, 7, L"0x%x", NULL, NULL,NULL, NULL },
{ L"Base Address", 8, 8, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Memory Range Length", 4, 16, L"0x%x", NULL, NULL,ValidateRangeLength4,
NULL },
{ L"Doorbell Register", 12, 20, NULL, DumpGas, NULL,
ValidatePccDoorbellGas, NULL },
{ L"Doorbell Preserve", 8, 32, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Doorbell Write", 8, 40, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Nominal Latency", 4, 48, L"%u", NULL, NULL,NULL, NULL },
{ L"Maximum Periodic Access Rate", 4, 52, L"%u", NULL, NULL,NULL, NULL },
{ L"Minimum Request Turnaround Time", 4, 56, L"%u", NULL, NULL,NULL, NULL },
{ L"Platform Interrupt Ack Register", 12, 60, NULL, DumpGas, NULL,
ValidatePccIntAckGas, NULL },
{ L"Platform Interrupt Ack Preserve", 8, 72, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Platform Interrupt Ack Set", 8, 80, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Reserved", 8, 88, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Cmd Complete Check Reg Addr", 12, 96, NULL, DumpGas, NULL,
ValidatePccGas, NULL },
{ L"Cmd Complete Check Mask", 8, 108, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Cmd Update Reg Addr", 12, 116, NULL, DumpGas, NULL,
ValidatePccGas, NULL },
{ L"Cmd Update Preserve mask", 8, 128, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Cmd Update Set mask", 8, 136, L"0x%lx", NULL, NULL,NULL, NULL },
{ L"Error Status Register", 12, 144, NULL, DumpGas, NULL,
ValidatePccErrStatusGas, NULL },
{ L"Error Status Mask", 8, 156, L"0x%lx", NULL, NULL,NULL, NULL },
};
/**
An ACPI_PARSER array describing the HW Registers based Communications
Subspace Structure - Type 5
*/
STATIC CONST ACPI_PARSER PccSubspaceType5Parser[] = {
PCC_SUBSPACE_HEADER (),
{ L"Version", 2, 2, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Base Address", 8, 4, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Shared Memory Range Length",8, 12, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Doorbell Register", 12, 20, NULL, DumpGas, NULL,
ValidatePccMemoryIoGas,NULL },
{ L"Doorbell Preserve", 8, 32, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Doorbell Write", 8, 40, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Command Complete Check Register",12, 48, NULL, DumpGas, NULL,
ValidatePccMemoryIoGas,NULL },
{ L"Command Complete Check Mask",8, 60, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Error Status Register",12, 68, NULL, DumpGas, NULL,
ValidatePccMemoryIoGas,NULL },
{ L"Error Status Mask", 8, 80, L"0x%lx", NULL, NULL, NULL, NULL },
{ L"Nominal Latency", 4, 88, L"0x%x", NULL, NULL, NULL, NULL },
{ L"Minimum Request Turnaround Time",4, 92, L"0x%x", NULL, NULL, NULL, NULL }
};
/**
This function parses the PCC Subspace type 0.
@param [in] Ptr Pointer to the start of Subspace Structure.
@param [in] Length Length of the Subspace Structure.
**/
STATIC
VOID
DumpPccSubspaceType0 (
IN UINT8 *Ptr,
IN UINT8 Length
)
{
ParseAcpi (
TRUE,
2,
"Subspace Type 0",
Ptr,
Length,
PARSER_PARAMS (PccSubspaceType0Parser)
);
}
/**
This function parses the PCC Subspace type 1.
@param [in] Ptr Pointer to the start of the Subspace Structure.
@param [in] Length Length of the Subspace Structure.
**/
STATIC
VOID
DumpPccSubspaceType1 (
IN UINT8 *Ptr,
IN UINT8 Length
)
{
ParseAcpi (
TRUE,
2,
"Subspace Type 1",
Ptr,
Length,
PARSER_PARAMS (PccSubspaceType1Parser)
);
}
/**
This function parses the PCC Subspace type 2.
@param [in] Ptr Pointer to the start of the Subspace Structure.
@param [in] Length Length of the Subspace Structure.
**/
STATIC
VOID
DumpPccSubspaceType2 (
IN UINT8 *Ptr,
IN UINT8 Length
)
{
ParseAcpi (
TRUE,
2,
"Subspace Type 2",
Ptr,
Length,
PARSER_PARAMS (PccSubspaceType2Parser)
);
}
/**
This function parses the PCC Subspace type 3.
@param [in] Ptr Pointer to the start of the Subspace Structure.
@param [in] Length Length of the Subspace Structure.
**/
STATIC
VOID
DumpPccSubspaceType3 (
IN UINT8 *Ptr,
IN UINT8 Length
)
{
ParseAcpi (
TRUE,
2,
"Subspace Type 3",
Ptr,
Length,
PARSER_PARAMS (PccSubspaceType3Parser)
);
}
/**
This function parses the PCC Subspace type 4.
@param [in] Ptr Pointer to the start of the Subspace Structure.
@param [in] Length Length of the Subspace Structure.
**/
STATIC
VOID
DumpPccSubspaceType4 (
IN UINT8 *Ptr,
IN UINT8 Length
)
{
ParseAcpi (
TRUE,
2,
"Subspace Type 4",
Ptr,
Length,
PARSER_PARAMS (PccSubspaceType3Parser)
);
}
/**
This function parses the PCC Subspace type 5.
@param [in] Ptr Pointer to the start of the Subspace Structure.
@param [in] Length Length of the Subspace Structure.
**/
STATIC
VOID
DumpPccSubspaceType5 (
IN UINT8 *Ptr,
IN UINT8 Length
)
{
ParseAcpi (
TRUE,
2,
"Subspace Type 5",
Ptr,
Length,
PARSER_PARAMS (PccSubspaceType5Parser)
);
}
/**
This function parses the ACPI PCCT table including its sub-structures
of type 0 through 4.
When trace is enabled this function parses the PCCT 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
ParseAcpiPcct (
IN BOOLEAN Trace,
IN UINT8 *Ptr,
IN UINT32 AcpiTableLength,
IN UINT8 AcpiTableRevision
)
{
UINT32 Offset;
UINT8 *PccSubspacePtr;
UINTN SubspaceCount;
if (!Trace) {
return;
}
Offset = ParseAcpi (
TRUE,
0,
"PCCT",
Ptr,
AcpiTableLength,
PARSER_PARAMS (PcctParser)
);
PccSubspacePtr = Ptr + Offset;
SubspaceCount = 0;
while (Offset < AcpiTableLength) {
// Parse common structure header to obtain Type and Length.
ParseAcpi (
FALSE,
0,
NULL,
PccSubspacePtr,
AcpiTableLength - Offset,
PARSER_PARAMS (PccSubspaceHeaderParser)
);
// Check if the values used to control the parsing logic have been
// successfully read.
if ((PccSubspaceType == NULL) ||
(PccSubspaceLength == NULL))
{
IncrementErrorCount ();
Print (
L"ERROR: Insufficient remaining table buffer length to read the " \
L"structure header. Length = %u.\n",
AcpiTableLength - Offset
);
return;
}
// Validate Structure length
if ((*PccSubspaceLength == 0) ||
((Offset + (*PccSubspaceLength)) > AcpiTableLength))
{
IncrementErrorCount ();
Print (
L"ERROR: Invalid Structure length. " \
L"Length = %u. Offset = %u. AcpiTableLength = %u.\n",
*PccSubspaceLength,
Offset,
AcpiTableLength
);
return;
}
switch (*PccSubspaceType) {
case EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_GENERIC:
DumpPccSubspaceType0 (
PccSubspacePtr,
*PccSubspaceLength
);
break;
case EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_1_HW_REDUCED_COMMUNICATIONS:
DumpPccSubspaceType1 (
PccSubspacePtr,
*PccSubspaceLength
);
break;
case EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_2_HW_REDUCED_COMMUNICATIONS:
DumpPccSubspaceType2 (
PccSubspacePtr,
*PccSubspaceLength
);
break;
case EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_3_EXTENDED_PCC:
DumpPccSubspaceType3 (
PccSubspacePtr,
*PccSubspaceLength
);
break;
case EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_4_EXTENDED_PCC:
DumpPccSubspaceType4 (
PccSubspacePtr,
*PccSubspaceLength
);
break;
case EFI_ACPI_6_4_PCCT_SUBSPACE_TYPE_5_HW_REGISTERS_COMMUNICATIONS:
DumpPccSubspaceType5 (
PccSubspacePtr,
*PccSubspaceLength
);
break;
default:
IncrementErrorCount ();
Print (
L"ERROR: Unknown PCC subspace structure:"
L" Type = %u, Length = %u\n",
PccSubspaceType,
*PccSubspaceLength
);
}
PccSubspacePtr += *PccSubspaceLength;
Offset += *PccSubspaceLength;
SubspaceCount++;
} // while
if (SubspaceCount > MAX_PCC_SUBSPACES) {
IncrementErrorCount ();
Print (L"ERROR: Too many PCC subspaces.");
}
}
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