pac.h

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/*
 * Copyright (c) 2026 BayLibre SAS
 *
 * SPDX-License-Identifier: Apache-2.0
 */

 
#ifndef ZEPHYR_INCLUDE_ARCH_ARM64_PAC_H_
#define ZEPHYR_INCLUDE_ARCH_ARM64_PAC_H_

 
#include <zephyr/types.h>
 
/* Forward declaration */
struct k_thread;

struct pac_key {
        uint64_t lo;  /* Low 64 bits of key */
        uint64_t hi;  /* High 64 bits of key */
};

struct pac_keys {
        union {
                struct {
                        struct pac_key apia;  /* Instruction Pointer Authentication Key A */
                        struct pac_key apib;  /* Instruction Pointer Authentication Key B */
                        struct pac_key apda;  /* Data Pointer Authentication Key A */
                        struct pac_key apdb;  /* Data Pointer Authentication Key B */
                        struct pac_key apga;  /* Generic Authentication Key */
                };
                uint8_t raw_bytes[5 * 2 * 8];  /* 5 keys × 2 (hi/lo) × 8 bytes = 80 bytes */
        };
};

void z_arm64_pac_keys_generate(struct pac_keys *keys);

void z_arm64_pac_keys_save(struct pac_keys *keys);

void z_arm64_pac_keys_restore(const struct pac_keys *keys);

void z_arm64_pac_thread_context_switch(struct k_thread *new_thread, struct k_thread *old_thread);

 
#endif /* ZEPHYR_INCLUDE_ARCH_ARM64_PAC_H_ */