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/*
* Copyright (c) 2019, 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>
static inline bool is_armv7_gentimer_present(void)
{
/* The Generic Timer is always present in an ARMv8-A implementation */
return true;
}
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_armv8_3_pauth_present(void)
{
uint64_t mask = (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, PAuth is present */
return (read_id_aa64isar1_el1() & mask) != 0U;
}
static inline bool is_armv8_3_pauth_api_present(void)
{
return ((read_id_aa64isar1_el1() >> ID_AA64ISAR1_API_SHIFT) &
ID_AA64ISAR1_API_MASK) != 0U;
}
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;
}
#endif /* ARCH_FEATURES_H */