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/** @file
Arm Firmware TRNG definitions.
Copyright (c) 2021 - 2022, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- [1] Arm True Random Number Generator Firmware, Interface 1.0,
Platform Design Document.
(https://developer.arm.com/documentation/den0098/latest/)
@par Glossary:
- TRNG - True Random Number Generator
- FID - Function ID
**/
#ifndef ARM_FW_TRNG_DEFS_H_
#define ARM_FW_TRNG_DEFS_H_
#include <IndustryStandard/ArmStdSmc.h>
// Firmware TRNG revision mask and shift
#define TRNG_REV_MAJOR_MASK 0x7FFF
#define TRNG_REV_MINOR_MASK 0xFFFF
#define TRNG_REV_MAJOR_SHIFT 16
#if defined (MDE_CPU_ARM)
/** FID to use on AArch32 platform to request entropy.
*/
#define ARM_SMC_ID_TRNG_RND ARM_SMC_ID_TRNG_RND_AARCH32
/** Maximum bits of entropy supported on AArch32.
*/
#define MAX_ENTROPY_BITS 96
#elif defined (MDE_CPU_AARCH64)
/** FID to use on AArch64 platform to request entropy.
*/
#define ARM_SMC_ID_TRNG_RND ARM_SMC_ID_TRNG_RND_AARCH64
/** Maximum bits of entropy supported on AArch64.
*/
#define MAX_ENTROPY_BITS 192
#else
#error "Firmware TRNG not supported. Unknown chipset."
#endif
#endif // ARM_FW_TRNG_DEFS_H_
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