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