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

 /*
  * Copyright (c) 2019-2023, 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>

 #define ISOLATE_FIELD(reg, feat)					\
 	((unsigned int)(((reg) >> (feat)) & ID_REG_FIELD_MASK))

 #define CREATE_FEATURE_FUNCS_VER(name, read_func, idvalue, guard)	\
 static inline bool is_ ## name ## _supported(void)			\
 {									\
 	if ((guard) == FEAT_STATE_DISABLED) {				\
 		return false;						\
 	}								\
 	if ((guard) == FEAT_STATE_ALWAYS) {				\
 		return true;						\
 	}								\
 	return read_func() >= (idvalue);				\
 }

 #define CREATE_FEATURE_FUNCS(name, idreg, idfield, guard)		\
 static unsigned int read_ ## name ## _id_field(void)			\
 {									\
 	return ISOLATE_FIELD(read_ ## idreg(), idfield);		\
 }									\
 CREATE_FEATURE_FUNCS_VER(name, read_ ## name ## _id_field, 1U, guard)

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

 CREATE_FEATURE_FUNCS(feat_pan, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_PAN_SHIFT,
 		     ENABLE_FEAT_PAN)
 CREATE_FEATURE_FUNCS(feat_vhe, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_VHE_SHIFT,
 		     ENABLE_FEAT_VHE)

 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_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);
 }

 CREATE_FEATURE_FUNCS(feat_sel2, id_aa64pfr0_el1, ID_AA64PFR0_SEL2_SHIFT,
 		     ENABLE_FEAT_SEL2)
 CREATE_FEATURE_FUNCS(feat_twed, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_TWED_SHIFT,
 		     ENABLE_FEAT_TWED)
 CREATE_FEATURE_FUNCS(feat_fgt, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_FGT_SHIFT,
 		     ENABLE_FEAT_FGT)
 CREATE_FEATURE_FUNCS(feat_mte_perm, id_aa64pfr2_el1,
 		     ID_AA64PFR2_EL1_MTEPERM_SHIFT, ENABLE_FEAT_MTE_PERM)
 CREATE_FEATURE_FUNCS(feat_ecv, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_ECV_SHIFT,
 		     ENABLE_FEAT_ECV)
 CREATE_FEATURE_FUNCS_VER(feat_ecv_v2, read_feat_ecv_id_field,
 			 ID_AA64MMFR0_EL1_ECV_SELF_SYNCH, ENABLE_FEAT_ECV)

 CREATE_FEATURE_FUNCS(feat_rng, id_aa64isar0_el1, ID_AA64ISAR0_RNDR_SHIFT,
 		     ENABLE_FEAT_RNG)
 CREATE_FEATURE_FUNCS(feat_tcr2, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_TCRX_SHIFT,
 		     ENABLE_FEAT_TCR2)

 CREATE_FEATURE_FUNCS(feat_s2poe, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S2POE_SHIFT,
 		     ENABLE_FEAT_S2POE)
 CREATE_FEATURE_FUNCS(feat_s1poe, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S1POE_SHIFT,
 		     ENABLE_FEAT_S1POE)
 static inline bool is_feat_sxpoe_supported(void)
 {
 	return is_feat_s1poe_supported() || is_feat_s2poe_supported();
 }

 CREATE_FEATURE_FUNCS(feat_s2pie, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S2PIE_SHIFT,
 		     ENABLE_FEAT_S2PIE)
 CREATE_FEATURE_FUNCS(feat_s1pie, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S1PIE_SHIFT,
 		     ENABLE_FEAT_S1PIE)
 static inline bool is_feat_sxpie_supported(void)
 {
 	return is_feat_s1pie_supported() || is_feat_s2pie_supported();
 }

 /* FEAT_GCS: Guarded Control Stack */
 CREATE_FEATURE_FUNCS(feat_gcs, id_aa64pfr1_el1, ID_AA64PFR1_EL1_GCS_SHIFT,
 		     ENABLE_FEAT_GCS)

 /* FEAT_AMU: Activity Monitors Extension */
 CREATE_FEATURE_FUNCS(feat_amu, id_aa64pfr0_el1, ID_AA64PFR0_AMU_SHIFT,
 		     ENABLE_FEAT_AMU)
 CREATE_FEATURE_FUNCS_VER(feat_amuv1p1, read_feat_amu_id_field,
 			 ID_AA64PFR0_AMU_V1P1, ENABLE_FEAT_AMUv1p1)

 /*
  * 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 read_feat_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));
 }

 CREATE_FEATURE_FUNCS_VER(feat_mpam, read_feat_mpam_version, 1U,
 			 ENABLE_MPAM_FOR_LOWER_ELS)

 /* FEAT_HCX: Extended Hypervisor Configuration Register */
 CREATE_FEATURE_FUNCS(feat_hcx, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_HCX_SHIFT,
 		     ENABLE_FEAT_HCX)

 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 unsigned int read_feat_sb_id_field(void)
 {
 	return ISOLATE_FIELD(read_id_aa64isar1_el1(), ID_AA64ISAR1_SB_SHIFT);
 }

 /* FEAT_CSV2_2: Cache Speculation Variant 2 */
 CREATE_FEATURE_FUNCS(feat_csv2, id_aa64pfr0_el1, ID_AA64PFR0_CSV2_SHIFT, 0)
 CREATE_FEATURE_FUNCS_VER(feat_csv2_2, read_feat_csv2_id_field,
 			 ID_AA64PFR0_CSV2_2_SUPPORTED, ENABLE_FEAT_CSV2_2)

 /* FEAT_SPE: Statistical Profiling Extension */
 CREATE_FEATURE_FUNCS(feat_spe, id_aa64dfr0_el1, ID_AA64DFR0_PMS_SHIFT,
 		     ENABLE_SPE_FOR_NS)

 /* FEAT_SVE: Scalable Vector Extension */
 CREATE_FEATURE_FUNCS(feat_sve, id_aa64pfr0_el1, ID_AA64PFR0_SVE_SHIFT,
 		     ENABLE_SVE_FOR_NS)

 /* FEAT_RAS: Reliability, Accessibility, Serviceability */
 CREATE_FEATURE_FUNCS(feat_ras, id_aa64pfr0_el1,
 		     ID_AA64PFR0_RAS_SHIFT, ENABLE_FEAT_RAS)

 /* FEAT_DIT: Data Independent Timing instructions */
 CREATE_FEATURE_FUNCS(feat_dit, id_aa64pfr0_el1,
 		     ID_AA64PFR0_DIT_SHIFT, ENABLE_FEAT_DIT)

 CREATE_FEATURE_FUNCS(feat_sys_reg_trace, id_aa64dfr0_el1,
 		     ID_AA64DFR0_TRACEVER_SHIFT, ENABLE_SYS_REG_TRACE_FOR_NS)

 /* FEAT_TRF: TraceFilter */
 CREATE_FEATURE_FUNCS(feat_trf, id_aa64dfr0_el1, ID_AA64DFR0_TRACEFILT_SHIFT,
 		     ENABLE_TRF_FOR_NS)

 /* FEAT_NV2: Enhanced Nested Virtualization */
 CREATE_FEATURE_FUNCS(feat_nv, id_aa64mmfr2_el1, ID_AA64MMFR2_EL1_NV_SHIFT, 0)
 CREATE_FEATURE_FUNCS_VER(feat_nv2, read_feat_nv_id_field,
 			 ID_AA64MMFR2_EL1_NV2_SUPPORTED, CTX_INCLUDE_NEVE_REGS)

 /* FEAT_BRBE: Branch Record Buffer Extension */
 CREATE_FEATURE_FUNCS(feat_brbe, id_aa64dfr0_el1, ID_AA64DFR0_BRBE_SHIFT,
 		     ENABLE_BRBE_FOR_NS)

 /* FEAT_TRBE: Trace Buffer Extension */
 CREATE_FEATURE_FUNCS(feat_trbe, id_aa64dfr0_el1, ID_AA64DFR0_TRACEBUFFER_SHIFT,
 		     ENABLE_TRBE_FOR_NS)

 static inline unsigned int read_feat_sme_fa64_id_field(void)
 {
 	return ISOLATE_FIELD(read_id_aa64smfr0_el1(),
 			     ID_AA64SMFR0_EL1_SME_FA64_SHIFT);
 }
 /* FEAT_SMEx: Scalar Matrix Extension */
 CREATE_FEATURE_FUNCS(feat_sme, id_aa64pfr1_el1, ID_AA64PFR1_EL1_SME_SHIFT,
 		     ENABLE_SME_FOR_NS)
 CREATE_FEATURE_FUNCS_VER(feat_sme2, read_feat_sme_id_field,
 			 ID_AA64PFR1_EL1_SME2_SUPPORTED, ENABLE_SME2_FOR_NS)

 /*******************************************************************************
  * Function to get hardware granularity support
  ******************************************************************************/

 static inline unsigned int read_id_aa64mmfr0_el0_tgran4_field(void)
 {
 	return ISOLATE_FIELD(read_id_aa64mmfr0_el1(),
 			     ID_AA64MMFR0_EL1_TGRAN4_SHIFT);
 }

 static inline unsigned int read_id_aa64mmfr0_el0_tgran16_field(void)
 {
 	return ISOLATE_FIELD(read_id_aa64mmfr0_el1(),
 			     ID_AA64MMFR0_EL1_TGRAN16_SHIFT);
 }

 static inline unsigned int read_id_aa64mmfr0_el0_tgran64_field(void)
 {
 	return ISOLATE_FIELD(read_id_aa64mmfr0_el1(),
 			     ID_AA64MMFR0_EL1_TGRAN64_SHIFT);
 }

 static inline unsigned int read_feat_pmuv3_id_field(void)
 {
 	return ISOLATE_FIELD(read_id_aa64dfr0_el1(), ID_AA64DFR0_PMUVER_SHIFT);
 }

 static inline unsigned int read_feat_mtpmu_id_field(void)
 {
 	return ISOLATE_FIELD(read_id_aa64dfr0_el1(), ID_AA64DFR0_MTPMU_SHIFT);
 }

 static inline bool is_feat_mtpmu_supported(void)
 {
 	if (DISABLE_MTPMU == FEAT_STATE_DISABLED) {
 		return false;
 	}

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

 	unsigned int mtpmu = read_feat_mtpmu_id_field();

 	return (mtpmu != 0U) && (mtpmu != ID_AA64DFR0_MTPMU_DISABLED);
 }

 #endif /* ARCH_FEATURES_H */
	/*
	* Copyright (c) 2019-2023, 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>

	#define ISOLATE_FIELD(reg, feat) \
	((unsigned int)(((reg) >> (feat)) & ID_REG_FIELD_MASK))

	#define CREATE_FEATURE_FUNCS_VER(name, read_func, idvalue, guard) \
	static inline bool is_ ## name ## _supported(void) \
	{ \
	if ((guard) == FEAT_STATE_DISABLED) { \
	return false; \
	} \
	if ((guard) == FEAT_STATE_ALWAYS) { \
	return true; \
	} \
	return read_func() >= (idvalue); \
	}

	#define CREATE_FEATURE_FUNCS(name, idreg, idfield, guard) \
	static unsigned int read_ ## name ## _id_field(void) \
	{ \
	return ISOLATE_FIELD(read_ ## idreg(), idfield); \
	} \
	CREATE_FEATURE_FUNCS_VER(name, read_ ## name ## _id_field, 1U, guard)

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

	CREATE_FEATURE_FUNCS(feat_pan, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_PAN_SHIFT,
	ENABLE_FEAT_PAN)
	CREATE_FEATURE_FUNCS(feat_vhe, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_VHE_SHIFT,
	ENABLE_FEAT_VHE)

	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_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);
	}

	CREATE_FEATURE_FUNCS(feat_sel2, id_aa64pfr0_el1, ID_AA64PFR0_SEL2_SHIFT,
	ENABLE_FEAT_SEL2)
	CREATE_FEATURE_FUNCS(feat_twed, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_TWED_SHIFT,
	ENABLE_FEAT_TWED)
	CREATE_FEATURE_FUNCS(feat_fgt, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_FGT_SHIFT,
	ENABLE_FEAT_FGT)
	CREATE_FEATURE_FUNCS(feat_mte_perm, id_aa64pfr2_el1,
	ID_AA64PFR2_EL1_MTEPERM_SHIFT, ENABLE_FEAT_MTE_PERM)
	CREATE_FEATURE_FUNCS(feat_ecv, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_ECV_SHIFT,
	ENABLE_FEAT_ECV)
	CREATE_FEATURE_FUNCS_VER(feat_ecv_v2, read_feat_ecv_id_field,
	ID_AA64MMFR0_EL1_ECV_SELF_SYNCH, ENABLE_FEAT_ECV)

	CREATE_FEATURE_FUNCS(feat_rng, id_aa64isar0_el1, ID_AA64ISAR0_RNDR_SHIFT,
	ENABLE_FEAT_RNG)
	CREATE_FEATURE_FUNCS(feat_tcr2, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_TCRX_SHIFT,
	ENABLE_FEAT_TCR2)

	CREATE_FEATURE_FUNCS(feat_s2poe, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S2POE_SHIFT,
	ENABLE_FEAT_S2POE)
	CREATE_FEATURE_FUNCS(feat_s1poe, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S1POE_SHIFT,
	ENABLE_FEAT_S1POE)
	static inline bool is_feat_sxpoe_supported(void)
	{
	return is_feat_s1poe_supported() \|\| is_feat_s2poe_supported();
	}

	CREATE_FEATURE_FUNCS(feat_s2pie, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S2PIE_SHIFT,
	ENABLE_FEAT_S2PIE)
	CREATE_FEATURE_FUNCS(feat_s1pie, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S1PIE_SHIFT,
	ENABLE_FEAT_S1PIE)
	static inline bool is_feat_sxpie_supported(void)
	{
	return is_feat_s1pie_supported() \|\| is_feat_s2pie_supported();
	}

	/* FEAT_GCS: Guarded Control Stack */
	CREATE_FEATURE_FUNCS(feat_gcs, id_aa64pfr1_el1, ID_AA64PFR1_EL1_GCS_SHIFT,
	ENABLE_FEAT_GCS)

	/* FEAT_AMU: Activity Monitors Extension */
	CREATE_FEATURE_FUNCS(feat_amu, id_aa64pfr0_el1, ID_AA64PFR0_AMU_SHIFT,
	ENABLE_FEAT_AMU)
	CREATE_FEATURE_FUNCS_VER(feat_amuv1p1, read_feat_amu_id_field,
	ID_AA64PFR0_AMU_V1P1, ENABLE_FEAT_AMUv1p1)

	/*
	* 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 read_feat_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));
	}

	CREATE_FEATURE_FUNCS_VER(feat_mpam, read_feat_mpam_version, 1U,
	ENABLE_MPAM_FOR_LOWER_ELS)

	/* FEAT_HCX: Extended Hypervisor Configuration Register */
	CREATE_FEATURE_FUNCS(feat_hcx, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_HCX_SHIFT,
	ENABLE_FEAT_HCX)

	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 unsigned int read_feat_sb_id_field(void)
	{
	return ISOLATE_FIELD(read_id_aa64isar1_el1(), ID_AA64ISAR1_SB_SHIFT);
	}

	/* FEAT_CSV2_2: Cache Speculation Variant 2 */
	CREATE_FEATURE_FUNCS(feat_csv2, id_aa64pfr0_el1, ID_AA64PFR0_CSV2_SHIFT, 0)
	CREATE_FEATURE_FUNCS_VER(feat_csv2_2, read_feat_csv2_id_field,
	ID_AA64PFR0_CSV2_2_SUPPORTED, ENABLE_FEAT_CSV2_2)

	/* FEAT_SPE: Statistical Profiling Extension */
	CREATE_FEATURE_FUNCS(feat_spe, id_aa64dfr0_el1, ID_AA64DFR0_PMS_SHIFT,
	ENABLE_SPE_FOR_NS)

	/* FEAT_SVE: Scalable Vector Extension */
	CREATE_FEATURE_FUNCS(feat_sve, id_aa64pfr0_el1, ID_AA64PFR0_SVE_SHIFT,
	ENABLE_SVE_FOR_NS)

	/* FEAT_RAS: Reliability, Accessibility, Serviceability */
	CREATE_FEATURE_FUNCS(feat_ras, id_aa64pfr0_el1,
	ID_AA64PFR0_RAS_SHIFT, ENABLE_FEAT_RAS)

	/* FEAT_DIT: Data Independent Timing instructions */
	CREATE_FEATURE_FUNCS(feat_dit, id_aa64pfr0_el1,
	ID_AA64PFR0_DIT_SHIFT, ENABLE_FEAT_DIT)

	CREATE_FEATURE_FUNCS(feat_sys_reg_trace, id_aa64dfr0_el1,
	ID_AA64DFR0_TRACEVER_SHIFT, ENABLE_SYS_REG_TRACE_FOR_NS)

	/* FEAT_TRF: TraceFilter */
	CREATE_FEATURE_FUNCS(feat_trf, id_aa64dfr0_el1, ID_AA64DFR0_TRACEFILT_SHIFT,
	ENABLE_TRF_FOR_NS)

	/* FEAT_NV2: Enhanced Nested Virtualization */
	CREATE_FEATURE_FUNCS(feat_nv, id_aa64mmfr2_el1, ID_AA64MMFR2_EL1_NV_SHIFT, 0)
	CREATE_FEATURE_FUNCS_VER(feat_nv2, read_feat_nv_id_field,
	ID_AA64MMFR2_EL1_NV2_SUPPORTED, CTX_INCLUDE_NEVE_REGS)

	/* FEAT_BRBE: Branch Record Buffer Extension */
	CREATE_FEATURE_FUNCS(feat_brbe, id_aa64dfr0_el1, ID_AA64DFR0_BRBE_SHIFT,
	ENABLE_BRBE_FOR_NS)

	/* FEAT_TRBE: Trace Buffer Extension */
	CREATE_FEATURE_FUNCS(feat_trbe, id_aa64dfr0_el1, ID_AA64DFR0_TRACEBUFFER_SHIFT,
	ENABLE_TRBE_FOR_NS)

	static inline unsigned int read_feat_sme_fa64_id_field(void)
	{
	return ISOLATE_FIELD(read_id_aa64smfr0_el1(),
	ID_AA64SMFR0_EL1_SME_FA64_SHIFT);
	}
	/* FEAT_SMEx: Scalar Matrix Extension */
	CREATE_FEATURE_FUNCS(feat_sme, id_aa64pfr1_el1, ID_AA64PFR1_EL1_SME_SHIFT,
	ENABLE_SME_FOR_NS)
	CREATE_FEATURE_FUNCS_VER(feat_sme2, read_feat_sme_id_field,
	ID_AA64PFR1_EL1_SME2_SUPPORTED, ENABLE_SME2_FOR_NS)

	/*******************************************************************************
	* Function to get hardware granularity support
	******************************************************************************/

	static inline unsigned int read_id_aa64mmfr0_el0_tgran4_field(void)
	{
	return ISOLATE_FIELD(read_id_aa64mmfr0_el1(),
	ID_AA64MMFR0_EL1_TGRAN4_SHIFT);
	}

	static inline unsigned int read_id_aa64mmfr0_el0_tgran16_field(void)
	{
	return ISOLATE_FIELD(read_id_aa64mmfr0_el1(),
	ID_AA64MMFR0_EL1_TGRAN16_SHIFT);
	}

	static inline unsigned int read_id_aa64mmfr0_el0_tgran64_field(void)
	{
	return ISOLATE_FIELD(read_id_aa64mmfr0_el1(),
	ID_AA64MMFR0_EL1_TGRAN64_SHIFT);
	}

	static inline unsigned int read_feat_pmuv3_id_field(void)
	{
	return ISOLATE_FIELD(read_id_aa64dfr0_el1(), ID_AA64DFR0_PMUVER_SHIFT);
	}

	static inline unsigned int read_feat_mtpmu_id_field(void)
	{
	return ISOLATE_FIELD(read_id_aa64dfr0_el1(), ID_AA64DFR0_MTPMU_SHIFT);
	}

	static inline bool is_feat_mtpmu_supported(void)
	{
	if (DISABLE_MTPMU == FEAT_STATE_DISABLED) {
	return false;
	}

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

	unsigned int mtpmu = read_feat_mtpmu_id_field();

	return (mtpmu != 0U) && (mtpmu != ID_AA64DFR0_MTPMU_DISABLED);
	}

	#endif /* ARCH_FEATURES_H */