projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3aa8dc6c LQ |
1 | /** @file\r |
| 2 | RDRAND Support Routines.\r | |
| 3 | \r | |
| 4 | Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>\r | |
| 5 | This program and the accompanying materials\r | |
| 6 | are licensed and made available under the terms and conditions of the BSD License\r | |
| 7 | which accompanies this distribution. The full text of the license may be found at\r | |
| 8 | http://opensource.org/licenses/bsd-license.php\r | |
| 9 | \r | |
| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 12 | \r | |
| 13 | **/\r | |
| 14 | \r | |
| 15 | #include "RdRand.h"\r | |
| 16 | \r | |
| 17 | /**\r | |
| 18 | Calls RDRAND to request a word-length random number.\r | |
| 19 | \r | |
| 20 | @param[out] Rand Buffer pointer to store the random number.\r | |
| 21 | @param[in] NeedRetry Determine whether or not to loop retry.\r | |
| 22 | \r | |
| 23 | @retval EFI_SUCCESS Random word generation succeeded.\r | |
| 24 | @retval EFI_NOT_READY Failed to request random word.\r | |
| 25 | \r | |
| 26 | **/\r | |
| 27 | EFI_STATUS\r | |
| 28 | EFIAPI\r | |
| 29 | RdRandWord (\r | |
| 30 | OUT UINTN *Rand,\r | |
| 31 | IN BOOLEAN NeedRetry\r | |
| 32 | )\r | |
| 33 | {\r | |
| 34 | return RdRand64 (Rand, NeedRetry);\r | |
| 35 | }\r | |
| 36 | \r | |
| 37 | /**\r | |
| 38 | Calls RDRAND to request multiple word-length random numbers.\r | |
| 39 | \r | |
| 40 | @param[in] Length Size of the buffer, in words, to fill with.\r | |
| 41 | @param[out] RandBuffer Pointer to the buffer to store the random result.\r | |
| 42 | \r | |
| 43 | @retval EFI_SUCCESS Random words generation succeeded.\r | |
| 44 | @retval EFI_NOT_READY Failed to request random words.\r | |
| 45 | \r | |
| 46 | **/\r | |
| 47 | EFI_STATUS\r | |
| 48 | EFIAPI\r | |
| 49 | RdRandGetWords (\r | |
| 50 | IN UINTN Length,\r | |
| 51 | OUT UINTN *RandBuffer\r | |
| 52 | )\r | |
| 53 | {\r | |
| 54 | EFI_STATUS Status;\r | |
| 55 | UINT32 Index;\r | |
| 56 | \r | |
| 57 | for (Index = 0; Index < Length; Index++) {\r | |
| 58 | //\r | |
| 59 | // Obtain one word-length (64-bit) Random Number with possible retry-loop.\r | |
| 60 | //\r | |
| 61 | Status = RdRand64 (RandBuffer, TRUE);\r | |
| 62 | if (EFI_ERROR (Status)) {\r | |
| 63 | return Status;\r | |
| 64 | }\r | |
| 65 | \r | |
| 66 | RandBuffer++;\r | |
| 67 | }\r | |
| 68 | \r | |
| 69 | return EFI_SUCCESS;\r | |
| 70 | } |