1 /* 2 * Copyright (c) 2019, 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_3_pauth_apa_api_present(void) 38 { 39 uint64_t mask = (ID_AA64ISAR1_API_MASK << ID_AA64ISAR1_API_SHIFT) | 40 (ID_AA64ISAR1_APA_MASK << ID_AA64ISAR1_APA_SHIFT); 41 42 return (read_id_aa64isar1_el1() & mask) != 0U; 43 } 44 45 static inline bool is_armv8_4_ttst_present(void) 46 { 47 return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_ST_SHIFT) & 48 ID_AA64MMFR2_EL1_ST_MASK) == 1U; 49 } 50 51 #endif /* ARCH_FEATURES_H */ 52