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/** @file
Functions for processor information common to ARM and AARCH64.
Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <IndustryStandard/ArmCache.h>
#include <IndustryStandard/ArmStdSmc.h>
#include <IndustryStandard/SmBios.h>
#include <Library/ArmLib.h>
#include <Library/ArmSmcLib.h>
#include <Library/BaseMemoryLib.h>
#include "SmbiosProcessor.h"
/** Returns the maximum cache level implemented by the current CPU.
@return The maximum cache level implemented.
**/
UINT8
SmbiosProcessorGetMaxCacheLevel (
VOID
)
{
CLIDR_DATA Clidr;
UINT8 CacheLevel;
UINT8 MaxCacheLevel;
MaxCacheLevel = 0;
// Read the CLIDR register to find out what caches are present.
Clidr.Data = ReadCLIDR ();
// Get the cache type for the L1 cache. If it's 0, there are no caches.
if (CLIDR_GET_CACHE_TYPE (Clidr.Data, 1) == ClidrCacheTypeNone) {
return 0;
}
for (CacheLevel = 1; CacheLevel <= MAX_ARM_CACHE_LEVEL; CacheLevel++) {
if (CLIDR_GET_CACHE_TYPE (Clidr.Data, CacheLevel) == ClidrCacheTypeNone) {
MaxCacheLevel = CacheLevel;
break;
}
}
return MaxCacheLevel;
}
/** Returns whether or not the specified cache level has separate I/D caches.
@param CacheLevel The cache level (L1, L2 etc.).
@return TRUE if the cache level has separate I/D caches, FALSE otherwise.
**/
BOOLEAN
SmbiosProcessorHasSeparateCaches (
UINT8 CacheLevel
)
{
CLIDR_CACHE_TYPE CacheType;
CLIDR_DATA Clidr;
BOOLEAN SeparateCaches;
SeparateCaches = FALSE;
Clidr.Data = ReadCLIDR ();
CacheType = CLIDR_GET_CACHE_TYPE (Clidr.Data, CacheLevel - 1);
if (CacheType == ClidrCacheTypeSeparate) {
SeparateCaches = TRUE;
}
return SeparateCaches;
}
/** Checks if ther ARM64 SoC ID SMC call is supported
@return Whether the ARM64 SoC ID call is supported.
**/
BOOLEAN
HasSmcArm64SocId (
VOID
)
{
ARM_SMC_ARGS Args;
INT32 SmcCallStatus;
BOOLEAN Arm64SocIdSupported;
Arm64SocIdSupported = FALSE;
Args.Arg0 = SMCCC_VERSION;
ArmCallSmc (&Args);
SmcCallStatus = (INT32)Args.Arg0;
if (SmcCallStatus < 0 || (SmcCallStatus >> 16) >= 1) {
Args.Arg0 = SMCCC_ARCH_FEATURES;
Args.Arg1 = SMCCC_ARCH_SOC_ID;
ArmCallSmc (&Args);
if (Args.Arg0 >= 0) {
Arm64SocIdSupported = TRUE;
}
}
return Arm64SocIdSupported;
}
/** Fetches the JEP106 code and SoC Revision.
@param Jep106Code JEP 106 code.
@param SocRevision SoC revision.
@retval EFI_SUCCESS Succeeded.
@retval EFI_UNSUPPORTED Failed.
**/
EFI_STATUS
SmbiosGetSmcArm64SocId (
OUT INT32 *Jep106Code,
OUT INT32 *SocRevision
)
{
ARM_SMC_ARGS Args;
INT32 SmcCallStatus;
EFI_STATUS Status;
Status = EFI_SUCCESS;
Args.Arg0 = SMCCC_ARCH_SOC_ID;
Args.Arg1 = 0;
ArmCallSmc (&Args);
SmcCallStatus = (INT32)Args.Arg0;
if (SmcCallStatus >= 0) {
*Jep106Code = (INT32)Args.Arg0;
} else {
Status = EFI_UNSUPPORTED;
}
Args.Arg0 = SMCCC_ARCH_SOC_ID;
Args.Arg1 = 1;
ArmCallSmc (&Args);
SmcCallStatus = (INT32)Args.Arg0;
if (SmcCallStatus >= 0) {
*SocRevision = (INT32)Args.Arg0;
} else {
Status = EFI_UNSUPPORTED;
}
return Status;
}
/** Returns a value for the Processor ID field that conforms to SMBIOS
requirements.
@return Processor ID.
**/
UINT64
SmbiosGetProcessorId (
VOID
)
{
INT32 Jep106Code;
INT32 SocRevision;
UINT64 ProcessorId;
if (HasSmcArm64SocId ()) {
SmbiosGetSmcArm64SocId (&Jep106Code, &SocRevision);
ProcessorId = ((UINT64)Jep106Code << 32) | SocRevision;
} else {
ProcessorId = ArmReadMidr ();
}
return ProcessorId;
}
/** Returns the external clock frequency.
@return The external clock frequency.
**/
UINTN
SmbiosGetExternalClockFrequency (
VOID
)
{
return ArmReadCntFrq ();
}
/** Returns the SMBIOS ProcessorFamily field value.
@return The value for the ProcessorFamily field.
**/
UINT8
SmbiosGetProcessorFamily (
VOID
)
{
return ProcessorFamilyIndicatorFamily2;
}
/** Returns the ProcessorFamily2 field value.
@return The value for the ProcessorFamily2 field.
**/
UINT16
SmbiosGetProcessorFamily2 (
VOID
)
{
UINTN MainIdRegister;
UINT16 ProcessorFamily2;
MainIdRegister = ArmReadMidr ();
if (((MainIdRegister >> 16) & 0xF) < 8) {
ProcessorFamily2 = ProcessorFamilyARM;
} else {
if (sizeof (VOID*) == 4) {
ProcessorFamily2 = ProcessorFamilyARMv7;
} else {
ProcessorFamily2 = ProcessorFamilyARMv8;
}
}
return ProcessorFamily2;
}
/** Returns the SMBIOS Processor Characteristics.
@return Processor Characteristics bitfield.
**/
PROCESSOR_CHARACTERISTIC_FLAGS
SmbiosGetProcessorCharacteristics (
VOID
)
{
PROCESSOR_CHARACTERISTIC_FLAGS Characteristics;
ZeroMem (&Characteristics, sizeof (Characteristics));
Characteristics.ProcessorArm64SocId = HasSmcArm64SocId ();
return Characteristics;
}
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