include/arch/aarch64/arch_features.h - filogic/atf - Gitiles

 /*
  * Copyright (c) 2019-2022, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #ifndef ARCH_FEATURES_H
 #define ARCH_FEATURES_H

 #include <stdbool.h>

 #include <arch_helpers.h>
 #include <common/feat_detect.h>

 static inline bool is_armv7_gentimer_present(void)
 {
 	/* The Generic Timer is always present in an ARMv8-A implementation */
 	return true;
 }

 static inline bool is_armv8_1_pan_present(void)
 {
 	return ((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_PAN_SHIFT) &
 		ID_AA64MMFR1_EL1_PAN_MASK) != 0U;
 }

 static inline bool is_armv8_1_vhe_present(void)
 {
 	return ((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_VHE_SHIFT) &
 		ID_AA64MMFR1_EL1_VHE_MASK) != 0U;
 }

 static inline bool is_armv8_2_ttcnp_present(void)
 {
 	return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_CNP_SHIFT) &
 		ID_AA64MMFR2_EL1_CNP_MASK) != 0U;
 }

 static inline bool is_feat_pacqarma3_present(void)
 {
 	uint64_t mask_id_aa64isar2 =
 			(ID_AA64ISAR2_GPA3_MASK << ID_AA64ISAR2_GPA3_SHIFT) |
 			(ID_AA64ISAR2_APA3_MASK << ID_AA64ISAR2_APA3_SHIFT);

 	/* If any of the fields is not zero, QARMA3 algorithm is present */
 	return (read_id_aa64isar2_el1() & mask_id_aa64isar2) != 0U;
 }

 static inline bool is_armv8_3_pauth_present(void)
 {
 	uint64_t mask_id_aa64isar1 =
 		(ID_AA64ISAR1_GPI_MASK << ID_AA64ISAR1_GPI_SHIFT) |
 		(ID_AA64ISAR1_GPA_MASK << ID_AA64ISAR1_GPA_SHIFT) |
 		(ID_AA64ISAR1_API_MASK << ID_AA64ISAR1_API_SHIFT) |
 		(ID_AA64ISAR1_APA_MASK << ID_AA64ISAR1_APA_SHIFT);

 	/*
 	 * If any of the fields is not zero or QARMA3 is present,
 	 * PAuth is present
 	 */
 	return ((read_id_aa64isar1_el1() & mask_id_aa64isar1) != 0U ||
 		is_feat_pacqarma3_present());
 }

 static inline bool is_armv8_4_dit_present(void)
 {
 	return ((read_id_aa64pfr0_el1() >> ID_AA64PFR0_DIT_SHIFT) &
 		ID_AA64PFR0_DIT_MASK) == 1U;
 }

 static inline bool is_armv8_4_ttst_present(void)
 {
 	return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_ST_SHIFT) &
 		ID_AA64MMFR2_EL1_ST_MASK) == 1U;
 }

 static inline bool is_armv8_5_bti_present(void)
 {
 	return ((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_BT_SHIFT) &
 		ID_AA64PFR1_EL1_BT_MASK) == BTI_IMPLEMENTED;
 }

 static inline unsigned int get_armv8_5_mte_support(void)
 {
 	return ((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_MTE_SHIFT) &
 		ID_AA64PFR1_EL1_MTE_MASK);
 }

 static inline bool is_armv8_4_sel2_present(void)
 {
 	return ((read_id_aa64pfr0_el1() >> ID_AA64PFR0_SEL2_SHIFT) &
 		ID_AA64PFR0_SEL2_MASK) == 1ULL;
 }

 static inline bool is_armv8_6_twed_present(void)
 {
 	return (((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_TWED_SHIFT) &
 		ID_AA64MMFR1_EL1_TWED_MASK) == ID_AA64MMFR1_EL1_TWED_SUPPORTED);
 }

 static unsigned int read_feat_fgt_id_field(void)
 {
 	return (read_id_aa64mmfr0_el1() >> ID_AA64MMFR0_EL1_FGT_SHIFT) &
 		ID_AA64MMFR0_EL1_FGT_MASK;
 }

 static inline bool is_feat_fgt_supported(void)
 {
 	if (ENABLE_FEAT_FGT == FEAT_STATE_DISABLED) {
 		return false;
 	}

 	if (ENABLE_FEAT_FGT == FEAT_STATE_ALWAYS) {
 		return true;
 	}

 	return read_feat_fgt_id_field() != 0U;
 }

 static inline unsigned long int get_armv8_6_ecv_support(void)
 {
 	return ((read_id_aa64mmfr0_el1() >> ID_AA64MMFR0_EL1_ECV_SHIFT) &
 		ID_AA64MMFR0_EL1_ECV_MASK);
 }

 static inline bool is_armv8_5_rng_present(void)
 {
 	return ((read_id_aa64isar0_el1() >> ID_AA64ISAR0_RNDR_SHIFT) &
 		ID_AA64ISAR0_RNDR_MASK);
 }

 /*******************************************************************************
  * Functions to identify the presence of the Activity Monitors Extension
  ******************************************************************************/
 static unsigned int read_feat_amu_id_field(void)
 {
 	return (read_id_aa64pfr0_el1() >> ID_AA64PFR0_AMU_SHIFT) &
 		ID_AA64PFR0_AMU_MASK;
 }

 static inline bool is_feat_amu_supported(void)
 {
 	if (ENABLE_FEAT_AMUv1 == FEAT_STATE_DISABLED) {
 		return false;
 	}

 	if (ENABLE_FEAT_AMUv1 == FEAT_STATE_ALWAYS) {
 		return true;
 	}

 	return read_feat_amu_id_field() >= ID_AA64PFR0_AMU_V1;
 }

 static inline bool is_armv8_6_feat_amuv1p1_present(void)
 {
 	return read_feat_amu_id_field() >= ID_AA64PFR0_AMU_V1P1;
 }

 /*
  * Return MPAM version:
  *
  * 0x00: None Armv8.0 or later
  * 0x01: v0.1 Armv8.4 or later
  * 0x10: v1.0 Armv8.2 or later
  * 0x11: v1.1 Armv8.4 or later
  *
  */
 static inline unsigned int get_mpam_version(void)
 {
 	return (unsigned int)((((read_id_aa64pfr0_el1() >>
 		ID_AA64PFR0_MPAM_SHIFT) & ID_AA64PFR0_MPAM_MASK) << 4) |
 				((read_id_aa64pfr1_el1() >>
 		ID_AA64PFR1_MPAM_FRAC_SHIFT) & ID_AA64PFR1_MPAM_FRAC_MASK));
 }

 static inline unsigned int read_feat_hcx_id_field(void)
 {
 	return (read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_HCX_SHIFT) &
 		ID_AA64MMFR1_EL1_HCX_MASK;
 }

 static inline bool is_feat_hcx_supported(void)
 {
 	if (ENABLE_FEAT_HCX == FEAT_STATE_DISABLED) {
 		return false;
 	}

 	if (ENABLE_FEAT_HCX == FEAT_STATE_ALWAYS) {
 		return true;
 	}

 	return read_feat_hcx_id_field() != 0U;
 }

 static inline bool is_feat_rng_trap_present(void)
 {
 	return (((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_RNDR_TRAP_SHIFT) &
 			ID_AA64PFR1_EL1_RNDR_TRAP_MASK)
 			== ID_AA64PFR1_EL1_RNG_TRAP_SUPPORTED);
 }

 static inline unsigned int get_armv9_2_feat_rme_support(void)
 {
 	/*
 	 * Return the RME version, zero if not supported.  This function can be
 	 * used as both an integer value for the RME version or compared to zero
 	 * to detect RME presence.
 	 */
 	return (unsigned int)(read_id_aa64pfr0_el1() >>
 		ID_AA64PFR0_FEAT_RME_SHIFT) & ID_AA64PFR0_FEAT_RME_MASK;
 }

 /*********************************************************************************
  * Function to identify the presence of FEAT_SB (Speculation Barrier Instruction)
  ********************************************************************************/
 static inline bool is_armv8_0_feat_sb_present(void)
 {
 	return (((read_id_aa64isar1_el1() >> ID_AA64ISAR1_SB_SHIFT) &
 		ID_AA64ISAR1_SB_MASK) == ID_AA64ISAR1_SB_SUPPORTED);
 }

 /*********************************************************************************
  * Function to identify the presence of FEAT_CSV2_2 (Cache Speculation Variant 2)
  ********************************************************************************/
 static inline bool is_armv8_0_feat_csv2_2_present(void)
 {
 	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_CSV2_SHIFT) &
 		ID_AA64PFR0_CSV2_MASK) == ID_AA64PFR0_CSV2_2_SUPPORTED);
 }

 /**********************************************************************************
  * Function to identify the presence of FEAT_SPE (Statistical Profiling Extension)
  *********************************************************************************/
 static inline bool is_armv8_2_feat_spe_present(void)
 {
 	return (((read_id_aa64dfr0_el1() >> ID_AA64DFR0_PMS_SHIFT) &
 		ID_AA64DFR0_PMS_MASK) != ID_AA64DFR0_SPE_NOT_SUPPORTED);
 }

 /*******************************************************************************
  * Function to identify the presence of FEAT_SVE (Scalable Vector Extension)
  ******************************************************************************/
 static inline bool is_armv8_2_feat_sve_present(void)
 {
 	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_SVE_SHIFT) &
 		ID_AA64PFR0_SVE_MASK) == ID_AA64PFR0_SVE_SUPPORTED);
 }

 /*******************************************************************************
  * Function to identify the presence of FEAT_RAS (Reliability,Availability,
  * and Serviceability Extension)
  ******************************************************************************/
 static inline bool is_armv8_2_feat_ras_present(void)
 {
 	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_RAS_SHIFT) &
 		ID_AA64PFR0_RAS_MASK) != ID_AA64PFR0_RAS_NOT_SUPPORTED);
 }

 /**************************************************************************
  * Function to identify the presence of FEAT_DIT (Data Independent Timing)
  *************************************************************************/
 static inline bool is_armv8_4_feat_dit_present(void)
 {
 	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_DIT_SHIFT) &
 		ID_AA64PFR0_DIT_MASK) == ID_AA64PFR0_DIT_SUPPORTED);
 }

 /*************************************************************************
  * Function to identify the presence of FEAT_TRF (TraceLift)
  ************************************************************************/
 static inline bool is_arm8_4_feat_trf_present(void)
 {
 	return (((read_id_aa64dfr0_el1() >> ID_AA64DFR0_TRACEFILT_SHIFT) &
 		ID_AA64DFR0_TRACEFILT_MASK) == ID_AA64DFR0_TRACEFILT_SUPPORTED);
 }

 /********************************************************************************
  * Function to identify the presence of FEAT_NV2 (Enhanced Nested Virtualization
  * Support)
  *******************************************************************************/
 static inline unsigned int get_armv8_4_feat_nv_support(void)
 {
 	return (((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_NV_SHIFT) &
 		ID_AA64MMFR2_EL1_NV_MASK));
 }

 /*******************************************************************************
  * Function to identify the presence of FEAT_BRBE (Branch Record Buffer
  * Extension)
  ******************************************************************************/
 static inline bool is_feat_brbe_present(void)
 {
 	return (((read_id_aa64dfr0_el1() >> ID_AA64DFR0_BRBE_SHIFT) &
 		ID_AA64DFR0_BRBE_MASK) == ID_AA64DFR0_BRBE_SUPPORTED);
 }

 /*******************************************************************************
  * Function to identify the presence of FEAT_TRBE (Trace Buffer Extension)
  ******************************************************************************/
 static inline bool is_feat_trbe_present(void)
 {
 	return (((read_id_aa64dfr0_el1() >> ID_AA64DFR0_TRACEBUFFER_SHIFT) &
 		ID_AA64DFR0_TRACEBUFFER_MASK) == ID_AA64DFR0_TRACEBUFFER_SUPPORTED);
 }

 #endif /* ARCH_FEATURES_H */
	/*
	* Copyright (c) 2019-2022, Arm Limited. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#ifndef ARCH_FEATURES_H
	#define ARCH_FEATURES_H

	#include <stdbool.h>

	#include <arch_helpers.h>
	#include <common/feat_detect.h>

	static inline bool is_armv7_gentimer_present(void)
	{
	/* The Generic Timer is always present in an ARMv8-A implementation */
	return true;
	}

	static inline bool is_armv8_1_pan_present(void)
	{
	return ((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_PAN_SHIFT) &
	ID_AA64MMFR1_EL1_PAN_MASK) != 0U;
	}

	static inline bool is_armv8_1_vhe_present(void)
	{
	return ((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_VHE_SHIFT) &
	ID_AA64MMFR1_EL1_VHE_MASK) != 0U;
	}

	static inline bool is_armv8_2_ttcnp_present(void)
	{
	return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_CNP_SHIFT) &
	ID_AA64MMFR2_EL1_CNP_MASK) != 0U;
	}

	static inline bool is_feat_pacqarma3_present(void)
	{
	uint64_t mask_id_aa64isar2 =
	(ID_AA64ISAR2_GPA3_MASK << ID_AA64ISAR2_GPA3_SHIFT) \|
	(ID_AA64ISAR2_APA3_MASK << ID_AA64ISAR2_APA3_SHIFT);

	/* If any of the fields is not zero, QARMA3 algorithm is present */
	return (read_id_aa64isar2_el1() & mask_id_aa64isar2) != 0U;
	}

	static inline bool is_armv8_3_pauth_present(void)
	{
	uint64_t mask_id_aa64isar1 =
	(ID_AA64ISAR1_GPI_MASK << ID_AA64ISAR1_GPI_SHIFT) \|
	(ID_AA64ISAR1_GPA_MASK << ID_AA64ISAR1_GPA_SHIFT) \|
	(ID_AA64ISAR1_API_MASK << ID_AA64ISAR1_API_SHIFT) \|
	(ID_AA64ISAR1_APA_MASK << ID_AA64ISAR1_APA_SHIFT);

	/*
	* If any of the fields is not zero or QARMA3 is present,
	* PAuth is present
	*/
	return ((read_id_aa64isar1_el1() & mask_id_aa64isar1) != 0U \|\|
	is_feat_pacqarma3_present());
	}

	static inline bool is_armv8_4_dit_present(void)
	{
	return ((read_id_aa64pfr0_el1() >> ID_AA64PFR0_DIT_SHIFT) &
	ID_AA64PFR0_DIT_MASK) == 1U;
	}

	static inline bool is_armv8_4_ttst_present(void)
	{
	return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_ST_SHIFT) &
	ID_AA64MMFR2_EL1_ST_MASK) == 1U;
	}

	static inline bool is_armv8_5_bti_present(void)
	{
	return ((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_BT_SHIFT) &
	ID_AA64PFR1_EL1_BT_MASK) == BTI_IMPLEMENTED;
	}

	static inline unsigned int get_armv8_5_mte_support(void)
	{
	return ((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_MTE_SHIFT) &
	ID_AA64PFR1_EL1_MTE_MASK);
	}

	static inline bool is_armv8_4_sel2_present(void)
	{
	return ((read_id_aa64pfr0_el1() >> ID_AA64PFR0_SEL2_SHIFT) &
	ID_AA64PFR0_SEL2_MASK) == 1ULL;
	}

	static inline bool is_armv8_6_twed_present(void)
	{
	return (((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_TWED_SHIFT) &
	ID_AA64MMFR1_EL1_TWED_MASK) == ID_AA64MMFR1_EL1_TWED_SUPPORTED);
	}

	static unsigned int read_feat_fgt_id_field(void)
	{
	return (read_id_aa64mmfr0_el1() >> ID_AA64MMFR0_EL1_FGT_SHIFT) &
	ID_AA64MMFR0_EL1_FGT_MASK;
	}

	static inline bool is_feat_fgt_supported(void)
	{
	if (ENABLE_FEAT_FGT == FEAT_STATE_DISABLED) {
	return false;
	}

	if (ENABLE_FEAT_FGT == FEAT_STATE_ALWAYS) {
	return true;
	}

	return read_feat_fgt_id_field() != 0U;
	}

	static inline unsigned long int get_armv8_6_ecv_support(void)
	{
	return ((read_id_aa64mmfr0_el1() >> ID_AA64MMFR0_EL1_ECV_SHIFT) &
	ID_AA64MMFR0_EL1_ECV_MASK);
	}

	static inline bool is_armv8_5_rng_present(void)
	{
	return ((read_id_aa64isar0_el1() >> ID_AA64ISAR0_RNDR_SHIFT) &
	ID_AA64ISAR0_RNDR_MASK);
	}

	/*******************************************************************************
	* Functions to identify the presence of the Activity Monitors Extension
	******************************************************************************/
	static unsigned int read_feat_amu_id_field(void)
	{
	return (read_id_aa64pfr0_el1() >> ID_AA64PFR0_AMU_SHIFT) &
	ID_AA64PFR0_AMU_MASK;
	}

	static inline bool is_feat_amu_supported(void)
	{
	if (ENABLE_FEAT_AMUv1 == FEAT_STATE_DISABLED) {
	return false;
	}

	if (ENABLE_FEAT_AMUv1 == FEAT_STATE_ALWAYS) {
	return true;
	}

	return read_feat_amu_id_field() >= ID_AA64PFR0_AMU_V1;
	}

	static inline bool is_armv8_6_feat_amuv1p1_present(void)
	{
	return read_feat_amu_id_field() >= ID_AA64PFR0_AMU_V1P1;
	}

	/*
	* Return MPAM version:
	*
	* 0x00: None Armv8.0 or later
	* 0x01: v0.1 Armv8.4 or later
	* 0x10: v1.0 Armv8.2 or later
	* 0x11: v1.1 Armv8.4 or later
	*
	*/
	static inline unsigned int get_mpam_version(void)
	{
	return (unsigned int)((((read_id_aa64pfr0_el1() >>
	ID_AA64PFR0_MPAM_SHIFT) & ID_AA64PFR0_MPAM_MASK) << 4) \|
	((read_id_aa64pfr1_el1() >>
	ID_AA64PFR1_MPAM_FRAC_SHIFT) & ID_AA64PFR1_MPAM_FRAC_MASK));
	}

	static inline unsigned int read_feat_hcx_id_field(void)
	{
	return (read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_HCX_SHIFT) &
	ID_AA64MMFR1_EL1_HCX_MASK;
	}

	static inline bool is_feat_hcx_supported(void)
	{
	if (ENABLE_FEAT_HCX == FEAT_STATE_DISABLED) {
	return false;
	}

	if (ENABLE_FEAT_HCX == FEAT_STATE_ALWAYS) {
	return true;
	}

	return read_feat_hcx_id_field() != 0U;
	}

	static inline bool is_feat_rng_trap_present(void)
	{
	return (((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_RNDR_TRAP_SHIFT) &
	ID_AA64PFR1_EL1_RNDR_TRAP_MASK)
	== ID_AA64PFR1_EL1_RNG_TRAP_SUPPORTED);
	}

	static inline unsigned int get_armv9_2_feat_rme_support(void)
	{
	/*
	* Return the RME version, zero if not supported. This function can be
	* used as both an integer value for the RME version or compared to zero
	* to detect RME presence.
	*/
	return (unsigned int)(read_id_aa64pfr0_el1() >>
	ID_AA64PFR0_FEAT_RME_SHIFT) & ID_AA64PFR0_FEAT_RME_MASK;
	}

	/*********************************************************************************
	* Function to identify the presence of FEAT_SB (Speculation Barrier Instruction)
	********************************************************************************/
	static inline bool is_armv8_0_feat_sb_present(void)
	{
	return (((read_id_aa64isar1_el1() >> ID_AA64ISAR1_SB_SHIFT) &
	ID_AA64ISAR1_SB_MASK) == ID_AA64ISAR1_SB_SUPPORTED);
	}

	/*********************************************************************************
	* Function to identify the presence of FEAT_CSV2_2 (Cache Speculation Variant 2)
	********************************************************************************/
	static inline bool is_armv8_0_feat_csv2_2_present(void)
	{
	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_CSV2_SHIFT) &
	ID_AA64PFR0_CSV2_MASK) == ID_AA64PFR0_CSV2_2_SUPPORTED);
	}

	/**********************************************************************************
	* Function to identify the presence of FEAT_SPE (Statistical Profiling Extension)
	*********************************************************************************/
	static inline bool is_armv8_2_feat_spe_present(void)
	{
	return (((read_id_aa64dfr0_el1() >> ID_AA64DFR0_PMS_SHIFT) &
	ID_AA64DFR0_PMS_MASK) != ID_AA64DFR0_SPE_NOT_SUPPORTED);
	}

	/*******************************************************************************
	* Function to identify the presence of FEAT_SVE (Scalable Vector Extension)
	******************************************************************************/
	static inline bool is_armv8_2_feat_sve_present(void)
	{
	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_SVE_SHIFT) &
	ID_AA64PFR0_SVE_MASK) == ID_AA64PFR0_SVE_SUPPORTED);
	}

	/*******************************************************************************
	* Function to identify the presence of FEAT_RAS (Reliability,Availability,
	* and Serviceability Extension)
	******************************************************************************/
	static inline bool is_armv8_2_feat_ras_present(void)
	{
	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_RAS_SHIFT) &
	ID_AA64PFR0_RAS_MASK) != ID_AA64PFR0_RAS_NOT_SUPPORTED);
	}

	/**************************************************************************
	* Function to identify the presence of FEAT_DIT (Data Independent Timing)
	*************************************************************************/
	static inline bool is_armv8_4_feat_dit_present(void)
	{
	return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_DIT_SHIFT) &
	ID_AA64PFR0_DIT_MASK) == ID_AA64PFR0_DIT_SUPPORTED);
	}

	/*************************************************************************
	* Function to identify the presence of FEAT_TRF (TraceLift)
	************************************************************************/
	static inline bool is_arm8_4_feat_trf_present(void)
	{
	return (((read_id_aa64dfr0_el1() >> ID_AA64DFR0_TRACEFILT_SHIFT) &
	ID_AA64DFR0_TRACEFILT_MASK) == ID_AA64DFR0_TRACEFILT_SUPPORTED);
	}

	/********************************************************************************
	* Function to identify the presence of FEAT_NV2 (Enhanced Nested Virtualization
	* Support)
	*******************************************************************************/
	static inline unsigned int get_armv8_4_feat_nv_support(void)
	{
	return (((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_NV_SHIFT) &
	ID_AA64MMFR2_EL1_NV_MASK));
	}

	/*******************************************************************************
	* Function to identify the presence of FEAT_BRBE (Branch Record Buffer
	* Extension)
	******************************************************************************/
	static inline bool is_feat_brbe_present(void)
	{
	return (((read_id_aa64dfr0_el1() >> ID_AA64DFR0_BRBE_SHIFT) &
	ID_AA64DFR0_BRBE_MASK) == ID_AA64DFR0_BRBE_SUPPORTED);
	}

	/*******************************************************************************
	* Function to identify the presence of FEAT_TRBE (Trace Buffer Extension)
	******************************************************************************/
	static inline bool is_feat_trbe_present(void)
	{
	return (((read_id_aa64dfr0_el1() >> ID_AA64DFR0_TRACEBUFFER_SHIFT) &
	ID_AA64DFR0_TRACEBUFFER_MASK) == ID_AA64DFR0_TRACEBUFFER_SUPPORTED);
	}

	#endif /* ARCH_FEATURES_H */