1 /* 2 * Copyright (c) 2019-2020, Arm Limited. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #ifndef ARCH_FEATURES_H 8 #define ARCH_FEATURES_H 9 10 #include <stdbool.h> 11 12 #include <arch_helpers.h> 13 14 static inline bool is_armv7_gentimer_present(void) 15 { 16 /* The Generic Timer is always present in an ARMv8-A implementation */ 17 return true; 18 } 19 20 static inline bool is_armv8_2_ttcnp_present(void) 21 { 22 return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_CNP_SHIFT) & 23 ID_AA64MMFR2_EL1_CNP_MASK) != 0U; 24 } 25 26 static inline bool is_armv8_3_pauth_present(void) 27 { 28 uint64_t mask = (ID_AA64ISAR1_GPI_MASK << ID_AA64ISAR1_GPI_SHIFT) | 29 (ID_AA64ISAR1_GPA_MASK << ID_AA64ISAR1_GPA_SHIFT) | 30 (ID_AA64ISAR1_API_MASK << ID_AA64ISAR1_API_SHIFT) | 31 (ID_AA64ISAR1_APA_MASK << ID_AA64ISAR1_APA_SHIFT); 32 33 /* If any of the fields is not zero, PAuth is present */ 34 return (read_id_aa64isar1_el1() & mask) != 0U; 35 } 36 37 static inline bool is_armv8_4_ttst_present(void) 38 { 39 return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_ST_SHIFT) & 40 ID_AA64MMFR2_EL1_ST_MASK) == 1U; 41 } 42 43 static inline bool is_armv8_5_bti_present(void) 44 { 45 return ((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_BT_SHIFT) & 46 ID_AA64PFR1_EL1_BT_MASK) == BTI_IMPLEMENTED; 47 } 48 49 static inline unsigned int get_armv8_5_mte_support(void) 50 { 51 return ((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_MTE_SHIFT) & 52 ID_AA64PFR1_EL1_MTE_MASK); 53 } 54 55 static inline bool is_armv8_4_sel2_present(void) 56 { 57 return ((read_id_aa64pfr0_el1() >> ID_AA64PFR0_SEL2_SHIFT) & 58 ID_AA64PFR0_SEL2_MASK) == 1ULL; 59 } 60 61 static inline bool is_armv8_6_twed_present(void) 62 { 63 return (((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_TWED_SHIFT) & 64 ID_AA64MMFR1_EL1_TWED_MASK) == ID_AA64MMFR1_EL1_TWED_SUPPORTED); 65 } 66 67 static inline bool is_armv8_6_fgt_present(void) 68 { 69 return ((read_id_aa64mmfr0_el1() >> ID_AA64MMFR0_EL1_FGT_SHIFT) & 70 ID_AA64MMFR0_EL1_FGT_MASK) == ID_AA64MMFR0_EL1_FGT_SUPPORTED; 71 } 72 73 /* 74 * Return MPAM version: 75 * 76 * 0x00: None Armv8.0 or later 77 * 0x01: v0.1 Armv8.4 or later 78 * 0x10: v1.0 Armv8.2 or later 79 * 0x11: v1.1 Armv8.4 or later 80 * 81 */ 82 static inline unsigned int get_mpam_version(void) 83 { 84 return (unsigned int)((((read_id_aa64pfr0_el1() >> 85 ID_AA64PFR0_MPAM_SHIFT) & ID_AA64PFR0_MPAM_MASK) << 4) | 86 ((read_id_aa64pfr1_el1() >> 87 ID_AA64PFR1_MPAM_FRAC_SHIFT) & ID_AA64PFR1_MPAM_FRAC_MASK)); 88 } 89 90 #endif /* ARCH_FEATURES_H */ 91