include/arch/aarch64/arch_features.h

   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 static inline bool is_armv8_5_bti_present(void)
  52 {
  53         return ((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_BT_SHIFT) &
  54                 ID_AA64PFR1_EL1_BT_MASK) == BTI_IMPLEMENTED;
  55 }
  56
  57 static inline unsigned int get_armv8_5_mte_support(void)
  58 {
  59         return ((read_id_aa64pfr1_el1() >> ID_AA64PFR1_EL1_MTE_SHIFT) &
  60                 ID_AA64PFR1_EL1_MTE_MASK);
  61 }
  62
  63 #endif /* ARCH_FEATURES_H */