/** @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; | |
} |