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https://github.com/ARM-software/arm-trusted-firmware.git
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b86048c40c
The previous commit added the infrastructure to load and save ARMv8.3-PAuth registers during Non-secure <-> Secure world switches, but didn't actually enable pointer authentication in the firmware. This patch adds the functionality needed for platforms to provide authentication keys for the firmware, and a new option (ENABLE_PAUTH) to enable pointer authentication in the firmware itself. This option is disabled by default, and it requires CTX_INCLUDE_PAUTH_REGS to be enabled. Change-Id: I35127ec271e1198d43209044de39fa712ef202a5 Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/*
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* Copyright (c) 2019, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef ARCH_FEATURES_H
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#define ARCH_FEATURES_H
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#include <stdbool.h>
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#include <arch_helpers.h>
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static inline bool is_armv7_gentimer_present(void)
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{
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/* The Generic Timer is always present in an ARMv8-A implementation */
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return true;
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}
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static inline bool is_armv8_2_ttcnp_present(void)
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{
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return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_CNP_SHIFT) &
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ID_AA64MMFR2_EL1_CNP_MASK) != 0U;
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}
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static inline bool is_armv8_3_pauth_present(void)
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{
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uint64_t mask = (ID_AA64ISAR1_GPI_MASK << ID_AA64ISAR1_GPI_SHIFT) |
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(ID_AA64ISAR1_GPA_MASK << ID_AA64ISAR1_GPA_SHIFT) |
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(ID_AA64ISAR1_API_MASK << ID_AA64ISAR1_API_SHIFT) |
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(ID_AA64ISAR1_APA_MASK << ID_AA64ISAR1_APA_SHIFT);
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/* If any of the fields is not zero, PAuth is present */
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return (read_id_aa64isar1_el1() & mask) != 0U;
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}
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static inline bool is_armv8_3_pauth_api_present(void)
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{
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return ((read_id_aa64isar1_el1() >> ID_AA64ISAR1_API_SHIFT) &
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ID_AA64ISAR1_API_MASK) != 0U;
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}
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static inline bool is_armv8_4_ttst_present(void)
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{
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return ((read_id_aa64mmfr2_el1() >> ID_AA64MMFR2_EL1_ST_SHIFT) &
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ID_AA64MMFR2_EL1_ST_MASK) == 1U;
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}
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#endif /* ARCH_FEATURES_H */
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