projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| b7396789 XL |
1 | /** @file\r |
| 2 | Provide rand noise source.\r | |
| 3 | \r | |
| 4 | Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>\r | |
| 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
| 6 | \r | |
| 7 | **/\r | |
| 8 | \r | |
| 9 | #include <Library/BaseLib.h>\r | |
| 10 | #include <Library/DebugLib.h>\r | |
| 11 | #include <Library/TimerLib.h>\r | |
| 12 | \r | |
| 13 | /**\r | |
| 14 | Get 64-bit noise source\r | |
| 15 | \r | |
| 16 | @param[out] Rand Buffer pointer to store 64-bit noise source\r | |
| 17 | \r | |
| 18 | @retval TRUE Get randomness successfully.\r | |
| 19 | @retval FALSE Failed to generate\r | |
| 20 | **/\r | |
| 21 | BOOLEAN\r | |
| 22 | EFIAPI\r | |
| 23 | GetRandomNoise64 (\r | |
| 24 | OUT UINT64 *Rand\r | |
| 25 | )\r | |
| 26 | {\r | |
| 27 | UINT32 Index;\r | |
| 28 | UINT32 *RandPtr;\r | |
| 29 | \r | |
| 30 | if (NULL == Rand) {\r | |
| 31 | return FALSE;\r | |
| 32 | }\r | |
| 33 | \r | |
| 34 | RandPtr = (UINT32 *)Rand;\r | |
| 35 | \r | |
| 36 | for (Index = 0; Index < 2; Index ++) {\r | |
| 37 | *RandPtr = (UINT32) ((AsmReadTsc ()) & 0xFF);\r | |
| 38 | RandPtr++;\r | |
| 39 | MicroSecondDelay (10);\r | |
| 40 | }\r | |
| 41 | \r | |
| 42 | return TRUE;\r | |
| 43 | }\r |