include/arch/aarch64/arch_features.h

/*
 * Copyright (c) 2019-2024, 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, mask)						\
	((unsigned int)(((reg) >> (feat)) & mask))

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

#define CREATE_FEATURE_PRESENT(name, idreg, idfield, mask, idval)		\
__attribute__((always_inline))							\
static inline bool is_ ## name ## _present(void)				\
{										\
	return (ISOLATE_FIELD(read_ ## idreg(), idfield, mask) >= idval) 	\
		? true : false; 						\
}

#define CREATE_FEATURE_FUNCS(name, idreg, idfield, mask, idval, guard)		\
CREATE_FEATURE_PRESENT(name, idreg, idfield, mask, idval)			\
CREATE_FEATURE_SUPPORTED(name, is_ ## name ## _present, guard)


/* +----------------------------+
 * |	Features supported	|
 * +----------------------------+
 * |	GENTIMER		|
 * +----------------------------+
 * |	FEAT_PAN		|
 * +----------------------------+
 * |	FEAT_VHE		|
 * +----------------------------+
 * |	FEAT_TTCNP		|
 * +----------------------------+
 * |	FEAT_UAO		|
 * +----------------------------+
 * |	FEAT_PACQARMA3		|
 * +----------------------------+
 * |	FEAT_PAUTH		|
 * +----------------------------+
 * |	FEAT_TTST		|
 * +----------------------------+
 * |	FEAT_BTI		|
 * +----------------------------+
 * |	FEAT_MTE2		|
 * +----------------------------+
 * |	FEAT_SSBS		|
 * +----------------------------+
 * |	FEAT_NMI		|
 * +----------------------------+
 * |	FEAT_GCS		|
 * +----------------------------+
 * |	FEAT_EBEP		|
 * +----------------------------+
 * |	FEAT_SEBEP		|
 * +----------------------------+
 * |	FEAT_SEL2		|
 * +----------------------------+
 * |	FEAT_TWED		|
 * +----------------------------+
 * |	FEAT_FGT		|
 * +----------------------------+
 * |	FEAT_EC/ECV2		|
 * +----------------------------+
 * |	FEAT_RNG		|
 * +----------------------------+
 * |	FEAT_TCR2		|
 * +----------------------------+
 * |	FEAT_S2POE		|
 * +----------------------------+
 * |	FEAT_S1POE		|
 * +----------------------------+
 * |	FEAT_S2PIE		|
 * +----------------------------+
 * |	FEAT_S1PIE		|
 * +----------------------------+
 * |	FEAT_AMU/AMUV1P1	|
 * +----------------------------+
 * |	FEAT_MPAM		|
 * +----------------------------+
 * |	FEAT_HCX		|
 * +----------------------------+
 * |	FEAT_RNG_TRAP		|
 * +----------------------------+
 * |	FEAT_RME		|
 * +----------------------------+
 * |	FEAT_SB			|
 * +----------------------------+
 * |	FEAT_CSV2/CSV3		|
 * +----------------------------+
 * |	FEAT_SPE		|
 * +----------------------------+
 * |	FEAT_SVE		|
 * +----------------------------+
 * |	FEAT_RAS		|
 * +----------------------------+
 * |	FEAT_DIT		|
 * +----------------------------+
 * |	FEAT_SYS_REG_TRACE	|
 * +----------------------------+
 * |	FEAT_TRF		|
 * +----------------------------+
 * |	FEAT_NV/NV2		|
 * +----------------------------+
 * |	FEAT_BRBE		|
 * +----------------------------+
 * |	FEAT_TRBE		|
 * +----------------------------+
 * |	FEAT_SME/SME2		|
 * +----------------------------+
 * |	FEAT_PMUV3		|
 * +----------------------------+
 * |	FEAT_MTPMU		|
 * +----------------------------+
 * |	FEAT_FGT2		|
 * +----------------------------+
 */

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

/* FEAT_PAN: Privileged access never */
CREATE_FEATURE_FUNCS(feat_pan, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_PAN_SHIFT,
		     ID_AA64MMFR1_EL1_PAN_MASK, 1U, ENABLE_FEAT_PAN)

/* FEAT_VHE: Virtualization Host Extensions */
CREATE_FEATURE_FUNCS(feat_vhe, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_VHE_SHIFT,
		     ID_AA64MMFR1_EL1_VHE_MASK, 1U, ENABLE_FEAT_VHE)

/* FEAT_TTCNP: Translation table common not private */
CREATE_FEATURE_PRESENT(feat_ttcnp, id_aa64mmfr2_el1, ID_AA64MMFR2_EL1_CNP_SHIFT,
			ID_AA64MMFR2_EL1_CNP_MASK, 1U)

/* FEAT_UAO: User access override */
CREATE_FEATURE_PRESENT(feat_uao, id_aa64mmfr2_el1, ID_AA64MMFR2_EL1_UAO_SHIFT,
			ID_AA64MMFR2_EL1_UAO_MASK, 1U)

/* If any of the fields is not zero, QARMA3 algorithm is present */
CREATE_FEATURE_PRESENT(feat_pacqarma3, id_aa64isar2_el1, 0,
			((ID_AA64ISAR2_GPA3_MASK << ID_AA64ISAR2_GPA3_SHIFT) |
			(ID_AA64ISAR2_APA3_MASK << ID_AA64ISAR2_APA3_SHIFT)), 1U)

/* PAUTH */
__attribute__((always_inline))
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());
}

/* FEAT_TTST: Small translation tables */
CREATE_FEATURE_PRESENT(feat_ttst, id_aa64mmfr2_el1, ID_AA64MMFR2_EL1_ST_SHIFT,
			ID_AA64MMFR2_EL1_ST_MASK, 1U)

/* FEAT_BTI: Branch target identification */
CREATE_FEATURE_PRESENT(feat_bti, id_aa64pfr1_el1, ID_AA64PFR1_EL1_BT_SHIFT,
			ID_AA64PFR1_EL1_BT_MASK, BTI_IMPLEMENTED)

/* FEAT_MTE2: Memory tagging extension */
CREATE_FEATURE_FUNCS(feat_mte2, id_aa64pfr1_el1, ID_AA64PFR1_EL1_MTE_SHIFT,
		     ID_AA64PFR1_EL1_MTE_MASK, MTE_IMPLEMENTED_ELX, ENABLE_FEAT_MTE2)

/* FEAT_SSBS: Speculative store bypass safe */
CREATE_FEATURE_PRESENT(feat_ssbs, id_aa64pfr1_el1, ID_AA64PFR1_EL1_SSBS_SHIFT,
			ID_AA64PFR1_EL1_SSBS_MASK, 1U)

/* FEAT_NMI: Non-maskable interrupts */
CREATE_FEATURE_PRESENT(feat_nmi, id_aa64pfr1_el1, ID_AA64PFR1_EL1_NMI_SHIFT,
			ID_AA64PFR1_EL1_NMI_MASK, NMI_IMPLEMENTED)

/* FEAT_EBEP */
CREATE_FEATURE_PRESENT(feat_ebep, id_aa64dfr1_el1, ID_AA64DFR1_EBEP_SHIFT,
			ID_AA64DFR1_EBEP_MASK, EBEP_IMPLEMENTED)

/* FEAT_SEBEP */
CREATE_FEATURE_PRESENT(feat_sebep, id_aa64dfr0_el1, ID_AA64DFR0_SEBEP_SHIFT,
			ID_AA64DFR0_SEBEP_MASK, SEBEP_IMPLEMENTED)

/* FEAT_SEL2: Secure EL2 */
CREATE_FEATURE_FUNCS(feat_sel2, id_aa64pfr0_el1, ID_AA64PFR0_SEL2_SHIFT,
		     ID_AA64PFR0_SEL2_MASK, 1U, ENABLE_FEAT_SEL2)

/* FEAT_TWED: Delayed trapping of WFE */
CREATE_FEATURE_FUNCS(feat_twed, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_TWED_SHIFT,
		     ID_AA64MMFR1_EL1_TWED_MASK, 1U, ENABLE_FEAT_TWED)

/* FEAT_FGT: Fine-grained traps */
CREATE_FEATURE_FUNCS(feat_fgt, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_FGT_SHIFT,
		     ID_AA64MMFR0_EL1_FGT_MASK, 1U, ENABLE_FEAT_FGT)

/* FEAT_FGT2: Fine-grained traps extended */
CREATE_FEATURE_FUNCS(feat_fgt2, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_FGT_SHIFT,
		     ID_AA64MMFR0_EL1_FGT_MASK, FGT2_IMPLEMENTED, ENABLE_FEAT_FGT2)

/* FEAT_ECV: Enhanced Counter Virtualization */
CREATE_FEATURE_FUNCS(feat_ecv, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_ECV_SHIFT,
		     ID_AA64MMFR0_EL1_ECV_MASK, 1U, ENABLE_FEAT_ECV)
CREATE_FEATURE_FUNCS(feat_ecv_v2, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_ECV_SHIFT,
		     ID_AA64MMFR0_EL1_ECV_MASK, ID_AA64MMFR0_EL1_ECV_SELF_SYNCH, ENABLE_FEAT_ECV)

/* FEAT_RNG: Random number generator */
CREATE_FEATURE_FUNCS(feat_rng, id_aa64isar0_el1, ID_AA64ISAR0_RNDR_SHIFT,
		     ID_AA64ISAR0_RNDR_MASK, 1U, ENABLE_FEAT_RNG)

/* FEAT_TCR2: Support TCR2_ELx regs */
CREATE_FEATURE_FUNCS(feat_tcr2, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_TCRX_SHIFT,
		     ID_AA64MMFR3_EL1_TCRX_MASK, 1U, ENABLE_FEAT_TCR2)

/* FEAT_S2POE */
CREATE_FEATURE_FUNCS(feat_s2poe, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S2POE_SHIFT,
		     ID_AA64MMFR3_EL1_S2POE_MASK, 1U, ENABLE_FEAT_S2POE)

/* FEAT_S1POE */
CREATE_FEATURE_FUNCS(feat_s1poe, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S1POE_SHIFT,
		     ID_AA64MMFR3_EL1_S1POE_MASK, 1U, ENABLE_FEAT_S1POE)

__attribute__((always_inline))
static inline bool is_feat_sxpoe_supported(void)
{
	return is_feat_s1poe_supported() || is_feat_s2poe_supported();
}

/* FEAT_S2PIE */
CREATE_FEATURE_FUNCS(feat_s2pie, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S2PIE_SHIFT,
		     ID_AA64MMFR3_EL1_S2PIE_MASK, 1U, ENABLE_FEAT_S2PIE)

/* FEAT_S1PIE */
CREATE_FEATURE_FUNCS(feat_s1pie, id_aa64mmfr3_el1, ID_AA64MMFR3_EL1_S1PIE_SHIFT,
		     ID_AA64MMFR3_EL1_S1PIE_MASK, 1U, ENABLE_FEAT_S1PIE)

__attribute__((always_inline))
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,
		     ID_AA64PFR1_EL1_GCS_MASK, 1U, ENABLE_FEAT_GCS)

/* FEAT_AMU: Activity Monitors Extension */
CREATE_FEATURE_FUNCS(feat_amu, id_aa64pfr0_el1, ID_AA64PFR0_AMU_SHIFT,
		     ID_AA64PFR0_AMU_MASK, 1U, ENABLE_FEAT_AMU)

/* FEAT_AMUV1P1: AMU Extension v1.1 */
CREATE_FEATURE_FUNCS(feat_amuv1p1, id_aa64pfr0_el1, ID_AA64PFR0_AMU_SHIFT,
		     ID_AA64PFR0_AMU_MASK, 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
 *
 */
__attribute__((always_inline))
static inline bool is_feat_mpam_present(void)
{
	unsigned int ret = (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));
	return ret;
}

CREATE_FEATURE_SUPPORTED(feat_mpam, is_feat_mpam_present, ENABLE_FEAT_MPAM)

/*
 * FEAT_DebugV8P9: Debug extension. This function checks the field 3:0 of
 * ID_AA64DFR0 Aarch64 Debug Feature Register 0 for the version of
 * Feat_Debug supported. The value of the field determines feature presence
 *
 * 0b0110 - Arm v8.0 debug
 * 0b0111 - Arm v8.0 debug architecture with Virtualization host extensions
 * 0x1000 - FEAT_Debugv8p2 is supported
 * 0x1001 - FEAT_Debugv8p4 is supported
 * 0x1010 - FEAT_Debugv8p8 is supported
 * 0x1011 - FEAT_Debugv8p9 is supported
 *
 */
CREATE_FEATURE_FUNCS(feat_debugv8p9, id_aa64dfr0_el1, ID_AA64DFR0_DEBUGVER_SHIFT,
		ID_AA64DFR0_DEBUGVER_MASK, DEBUGVER_V8P9_IMPLEMENTED,
		ENABLE_FEAT_DEBUGV8P9)

/* FEAT_HCX: Extended Hypervisor Configuration Register */
CREATE_FEATURE_FUNCS(feat_hcx, id_aa64mmfr1_el1, ID_AA64MMFR1_EL1_HCX_SHIFT,
		     ID_AA64MMFR1_EL1_HCX_MASK, 1U, ENABLE_FEAT_HCX)

/* FEAT_RNG_TRAP: Trapping support */
CREATE_FEATURE_PRESENT(feat_rng_trap, id_aa64pfr1_el1, ID_AA64PFR1_EL1_RNDR_TRAP_SHIFT,
		      ID_AA64PFR1_EL1_RNDR_TRAP_MASK, RNG_TRAP_IMPLEMENTED)

/* Return the RME version, zero if not supported. */
CREATE_FEATURE_FUNCS(feat_rme, id_aa64pfr0_el1, ID_AA64PFR0_FEAT_RME_SHIFT,
		    ID_AA64PFR0_FEAT_RME_MASK, 1U, ENABLE_RME)

/* FEAT_SB: Speculation barrier instruction */
CREATE_FEATURE_PRESENT(feat_sb, id_aa64isar1_el1, ID_AA64ISAR1_SB_SHIFT,
		       ID_AA64ISAR1_SB_MASK, 1U)

/*
 * FEAT_CSV2: Cache Speculation Variant 2. This checks bit fields[56-59]
 * of id_aa64pfr0_el1 register and can be used to check for below features:
 * FEAT_CSV2_2: Cache Speculation Variant CSV2_2.
 * FEAT_CSV2_3: Cache Speculation Variant CSV2_3.
 * 0b0000 - Feature FEAT_CSV2 is not implemented.
 * 0b0001 - Feature FEAT_CSV2 is implemented, but FEAT_CSV2_2 and FEAT_CSV2_3
 *          are not implemented.
 * 0b0010 - Feature FEAT_CSV2_2 is implemented but FEAT_CSV2_3 is not
 *          implemented.
 * 0b0011 - Feature FEAT_CSV2_3 is implemented.
 */

CREATE_FEATURE_FUNCS(feat_csv2_2, id_aa64pfr0_el1, ID_AA64PFR0_CSV2_SHIFT,
		     ID_AA64PFR0_CSV2_MASK, CSV2_2_IMPLEMENTED, ENABLE_FEAT_CSV2_2)
CREATE_FEATURE_FUNCS(feat_csv2_3, id_aa64pfr0_el1, ID_AA64PFR0_CSV2_SHIFT,
		     ID_AA64PFR0_CSV2_MASK, CSV2_3_IMPLEMENTED, ENABLE_FEAT_CSV2_3)

/* FEAT_SPE: Statistical Profiling Extension */
CREATE_FEATURE_FUNCS(feat_spe, id_aa64dfr0_el1, ID_AA64DFR0_PMS_SHIFT,
		     ID_AA64DFR0_PMS_MASK, 1U, ENABLE_SPE_FOR_NS)

/* FEAT_SVE: Scalable Vector Extension */
CREATE_FEATURE_FUNCS(feat_sve, id_aa64pfr0_el1, ID_AA64PFR0_SVE_SHIFT,
		     ID_AA64PFR0_SVE_MASK, 1U, ENABLE_SVE_FOR_NS)

/* FEAT_RAS: Reliability, Accessibility, Serviceability */
CREATE_FEATURE_FUNCS(feat_ras, id_aa64pfr0_el1, ID_AA64PFR0_RAS_SHIFT,
		     ID_AA64PFR0_RAS_MASK, 1U, ENABLE_FEAT_RAS)

/* FEAT_DIT: Data Independent Timing instructions */
CREATE_FEATURE_FUNCS(feat_dit, id_aa64pfr0_el1, ID_AA64PFR0_DIT_SHIFT,
		     ID_AA64PFR0_DIT_MASK, 1U, ENABLE_FEAT_DIT)

/* FEAT_SYS_REG_TRACE */
CREATE_FEATURE_FUNCS(feat_sys_reg_trace, id_aa64dfr0_el1, ID_AA64DFR0_TRACEVER_SHIFT,
		    ID_AA64DFR0_TRACEVER_MASK, 1U, ENABLE_SYS_REG_TRACE_FOR_NS)

/* FEAT_TRF: TraceFilter */
CREATE_FEATURE_FUNCS(feat_trf, id_aa64dfr0_el1, ID_AA64DFR0_TRACEFILT_SHIFT,
		     ID_AA64DFR0_TRACEFILT_MASK, 1U, ENABLE_TRF_FOR_NS)

/* FEAT_NV2: Enhanced Nested Virtualization */
CREATE_FEATURE_FUNCS(feat_nv, id_aa64mmfr2_el1, ID_AA64MMFR2_EL1_NV_SHIFT,
		     ID_AA64MMFR2_EL1_NV_MASK, 1U, 0U)
CREATE_FEATURE_FUNCS(feat_nv2, id_aa64mmfr2_el1, ID_AA64MMFR2_EL1_NV_SHIFT,
		     ID_AA64MMFR2_EL1_NV_MASK, NV2_IMPLEMENTED, CTX_INCLUDE_NEVE_REGS)

/* FEAT_BRBE: Branch Record Buffer Extension */
CREATE_FEATURE_FUNCS(feat_brbe, id_aa64dfr0_el1, ID_AA64DFR0_BRBE_SHIFT,
		     ID_AA64DFR0_BRBE_MASK, 1U, ENABLE_BRBE_FOR_NS)

/* FEAT_TRBE: Trace Buffer Extension */
CREATE_FEATURE_FUNCS(feat_trbe, id_aa64dfr0_el1, ID_AA64DFR0_TRACEBUFFER_SHIFT,
		     ID_AA64DFR0_TRACEBUFFER_MASK, 1U, ENABLE_TRBE_FOR_NS)

/* FEAT_SME_FA64: Full A64 Instruction support in streaming SVE mode */
CREATE_FEATURE_PRESENT(feat_sme_fa64, id_aa64smfr0_el1, ID_AA64SMFR0_EL1_SME_FA64_SHIFT,
		    ID_AA64SMFR0_EL1_SME_FA64_MASK, 1U)

/* FEAT_SMEx: Scalar Matrix Extension */
CREATE_FEATURE_FUNCS(feat_sme, id_aa64pfr1_el1, ID_AA64PFR1_EL1_SME_SHIFT,
		     ID_AA64PFR1_EL1_SME_MASK, 1U, ENABLE_SME_FOR_NS)

CREATE_FEATURE_FUNCS(feat_sme2, id_aa64pfr1_el1, ID_AA64PFR1_EL1_SME_SHIFT,
		     ID_AA64PFR1_EL1_SME_MASK, SME2_IMPLEMENTED, ENABLE_SME2_FOR_NS)

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

__attribute__((always_inline))
static inline bool is_feat_tgran4K_present(void)
{
	unsigned int tgranx = ISOLATE_FIELD(read_id_aa64mmfr0_el1(),
			     ID_AA64MMFR0_EL1_TGRAN4_SHIFT, ID_REG_FIELD_MASK);
	return (tgranx < 8U);
}

CREATE_FEATURE_PRESENT(feat_tgran16K, id_aa64mmfr0_el1, ID_AA64MMFR0_EL1_TGRAN16_SHIFT,
		       ID_AA64MMFR0_EL1_TGRAN16_MASK, TGRAN16_IMPLEMENTED)

__attribute__((always_inline))
static inline bool is_feat_tgran64K_present(void)
{
	unsigned int tgranx = ISOLATE_FIELD(read_id_aa64mmfr0_el1(),
			     ID_AA64MMFR0_EL1_TGRAN64_SHIFT, ID_REG_FIELD_MASK);
	return (tgranx < 8U);
}

/* FEAT_PMUV3 */
CREATE_FEATURE_PRESENT(feat_pmuv3, id_aa64dfr0_el1, ID_AA64DFR0_PMUVER_SHIFT,
		      ID_AA64DFR0_PMUVER_MASK, 1U)

/* FEAT_MTPMU */
__attribute__((always_inline))
static inline bool is_feat_mtpmu_present(void)
{
	unsigned int mtpmu = ISOLATE_FIELD(read_id_aa64dfr0_el1(), ID_AA64DFR0_MTPMU_SHIFT,
					   ID_AA64DFR0_MTPMU_MASK);
	return (mtpmu != 0U) && (mtpmu != MTPMU_NOT_IMPLEMENTED);
}

CREATE_FEATURE_SUPPORTED(feat_mtpmu, is_feat_mtpmu_present, DISABLE_MTPMU)

#endif /* ARCH_FEATURES_H */