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a37e31fc97
The ARM DEN0098 document describe an SMCCC based firmware service to deliver hardware generated random numbers. Its existence is advertised according to the SMCCC v1.1 specification. Add a (dummy) call to probe functions implemented in each architecture (ARM and arm64), to determine the existence of this interface. For now this return false, but this will be overwritten by each architecture's support patch. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
40 lines
880 B
C
40 lines
880 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2020 Arm Limited
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*/
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#define pr_fmt(fmt) "smccc: " fmt
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#include <linux/cache.h>
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#include <linux/init.h>
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#include <linux/arm-smccc.h>
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#include <asm/archrandom.h>
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static u32 smccc_version = ARM_SMCCC_VERSION_1_0;
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static enum arm_smccc_conduit smccc_conduit = SMCCC_CONDUIT_NONE;
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bool __ro_after_init smccc_trng_available = false;
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void __init arm_smccc_version_init(u32 version, enum arm_smccc_conduit conduit)
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{
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smccc_version = version;
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smccc_conduit = conduit;
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smccc_trng_available = smccc_probe_trng();
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}
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enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
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{
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if (smccc_version < ARM_SMCCC_VERSION_1_1)
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return SMCCC_CONDUIT_NONE;
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return smccc_conduit;
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}
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EXPORT_SYMBOL_GPL(arm_smccc_1_1_get_conduit);
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u32 arm_smccc_get_version(void)
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{
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return smccc_version;
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}
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EXPORT_SYMBOL_GPL(arm_smccc_get_version);
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