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/** @file
Provide rand noise source.
Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/TimerLib.h>
/**
Get 64-bit noise source
@param[out] Rand Buffer pointer to store 64-bit noise source
@retval TRUE Get randomness successfully.
@retval FALSE Failed to generate
**/
BOOLEAN
EFIAPI
GetRandomNoise64 (
OUT UINT64 *Rand
)
{
UINT32 Index;
UINT32 *RandPtr;
if (NULL == Rand) {
return FALSE;
}
RandPtr = (UINT32 *)Rand;
for (Index = 0; Index < 2; Index ++) {
*RandPtr = (UINT32) ((AsmReadTsc ()) & 0xFF);
RandPtr++;
MicroSecondDelay (10);
}
return TRUE;
}
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