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/*
* Copyright (c) 2021-2022, ARM Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef TRNG_SVC_H
#define TRNG_SVC_H
#include <stdbool.h>
#include <stdint.h>
#include <lib/smccc.h>
/* SMC function IDs for TRNG queries */
#define ARM_TRNG_VERSION U(0x84000050)
#define ARM_TRNG_FEATURES U(0x84000051)
#define ARM_TRNG_GET_UUID U(0x84000052)
#define ARM_TRNG_RND32 U(0x84000053)
#define ARM_TRNG_RND64 U(0xC4000053)
/* TRNG version numbers */
#define TRNG_VERSION_MAJOR (0x1)
#define TRNG_VERSION_MINOR (0x0)
/* TRNG Error Numbers */
#define TRNG_E_SUCCESS (0)
#define TRNG_E_NOT_SUPPORTED (-1)
#define TRNG_E_INVALID_PARAMS (-2)
#define TRNG_E_NO_ENTROPY (-3)
#define TRNG_E_NOT_IMPLEMENTED (-4)
/* TRNG Entropy Bit Numbers */
#define TRNG_RND32_ENTROPY_MAXBITS (96U)
#define TRNG_RND64_ENTROPY_MAXBITS (192U)
/* Public API to perform the initial TRNG entropy setup */
void trng_setup(void);
/* Public API to verify function id is part of TRNG */
bool is_trng_fid(uint32_t smc_fid);
/* Handler to be called to handle TRNG smc calls */
uintptr_t trng_smc_handler(
uint32_t smc_fid,
u_register_t x1,
u_register_t x2,
u_register_t x3,
u_register_t x4,
void *cookie,
void *handle,
u_register_t flags
);
#endif /* TRNG_SVC_H */
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