2f88bd3a12
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737 Apply uncrustify changes to .c/.h files in the MdePkg package Cc: Andrew Fish <afish@apple.com> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
/** @file
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Random number generator services that uses RdRand instruction access
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to provide high-quality random numbers.
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Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
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Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Uefi.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include "BaseRngLibInternals.h"
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//
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// Bit mask used to determine if RdRand instruction is supported.
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//
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#define RDRAND_MASK BIT30
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STATIC BOOLEAN mRdRandSupported;
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/**
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The constructor function checks whether or not RDRAND instruction is supported
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by the host hardware.
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The constructor function checks whether or not RDRAND instruction is supported.
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It will ASSERT() if RDRAND instruction is not supported.
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It will always return EFI_SUCCESS.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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BaseRngLibConstructor (
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VOID
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)
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{
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UINT32 RegEcx;
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//
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// Determine RDRAND support by examining bit 30 of the ECX register returned by
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// CPUID. A value of 1 indicates that processor support RDRAND instruction.
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//
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AsmCpuid (1, 0, 0, &RegEcx, 0);
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ASSERT ((RegEcx & RDRAND_MASK) == RDRAND_MASK);
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mRdRandSupported = ((RegEcx & RDRAND_MASK) == RDRAND_MASK);
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return EFI_SUCCESS;
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}
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/**
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Generates a 16-bit random number.
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@param[out] Rand Buffer pointer to store the 16-bit random value.
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@retval TRUE Random number generated successfully.
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@retval FALSE Failed to generate the random number.
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**/
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BOOLEAN
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EFIAPI
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ArchGetRandomNumber16 (
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OUT UINT16 *Rand
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)
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{
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return AsmRdRand16 (Rand);
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}
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/**
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Generates a 32-bit random number.
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@param[out] Rand Buffer pointer to store the 32-bit random value.
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@retval TRUE Random number generated successfully.
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@retval FALSE Failed to generate the random number.
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**/
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BOOLEAN
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EFIAPI
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ArchGetRandomNumber32 (
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OUT UINT32 *Rand
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)
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{
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return AsmRdRand32 (Rand);
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}
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/**
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Generates a 64-bit random number.
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@param[out] Rand Buffer pointer to store the 64-bit random value.
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@retval TRUE Random number generated successfully.
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@retval FALSE Failed to generate the random number.
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**/
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BOOLEAN
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EFIAPI
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ArchGetRandomNumber64 (
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OUT UINT64 *Rand
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)
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{
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return AsmRdRand64 (Rand);
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}
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/**
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Checks whether RDRAND is supported.
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@retval TRUE RDRAND is supported.
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@retval FALSE RDRAND is not supported.
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**/
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BOOLEAN
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EFIAPI
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ArchIsRngSupported (
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VOID
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)
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{
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/*
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Existing software depends on this always returning TRUE, so for
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now hard-code it.
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return mRdRandSupported;
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*/
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return TRUE;
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}
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