projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 9eb5ccda PG |
1 | /** @file\r |
| 2 | Aarch64 specific code.\r | |
| 3 | \r | |
| 4 | Copyright (c) 2022, Arm Limited. All rights reserved.<BR>\r | |
| 5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
| 6 | **/\r | |
| 7 | \r | |
| 8 | #include <Library/BaseLib.h>\r | |
| 9 | #include <Library/BaseMemoryLib.h>\r | |
| 10 | #include <Library/DebugLib.h>\r | |
| 11 | #include <Library/MemoryAllocationLib.h>\r | |
| 12 | #include <Library/ArmTrngLib.h>\r | |
| 13 | \r | |
| 14 | #include "RngDxeInternals.h"\r | |
| 15 | \r | |
| 16 | // Maximum number of Rng algorithms.\r | |
| 17 | #define RNG_AVAILABLE_ALGO_MAX 2\r | |
| 18 | \r | |
| 19 | /** Allocate and initialize mAvailableAlgoArray with the available\r | |
| 20 | Rng algorithms. Also update mAvailableAlgoArrayCount.\r | |
| 21 | \r | |
| 22 | @retval EFI_SUCCESS The function completed successfully.\r | |
| 23 | @retval EFI_OUT_OF_RESOURCES Could not allocate memory.\r | |
| 24 | **/\r | |
| 25 | EFI_STATUS\r | |
| 26 | EFIAPI\r | |
| 27 | GetAvailableAlgorithms (\r | |
| 28 | VOID\r | |
| 29 | )\r | |
| 30 | {\r | |
| 31 | UINT64 DummyRand;\r | |
| 32 | UINT16 MajorRevision;\r | |
| 33 | UINT16 MinorRevision;\r | |
| 34 | \r | |
| 35 | // Rng algorithms 2 times, one for the allocation, one to populate.\r | |
| 36 | mAvailableAlgoArray = AllocateZeroPool (RNG_AVAILABLE_ALGO_MAX);\r | |
| 37 | if (mAvailableAlgoArray == NULL) {\r | |
| 38 | return EFI_OUT_OF_RESOURCES;\r | |
| 39 | }\r | |
| 40 | \r | |
| 41 | // Check RngGetBytes() before advertising PcdCpuRngSupportedAlgorithm.\r | |
| 42 | if (!EFI_ERROR (RngGetBytes (sizeof (DummyRand), (UINT8 *)&DummyRand))) {\r | |
| 43 | CopyMem (\r | |
| 44 | &mAvailableAlgoArray[mAvailableAlgoArrayCount],\r | |
| 45 | PcdGetPtr (PcdCpuRngSupportedAlgorithm),\r | |
| 46 | sizeof (EFI_RNG_ALGORITHM)\r | |
| 47 | );\r | |
| 48 | mAvailableAlgoArrayCount++;\r | |
| 49 | \r | |
| 50 | DEBUG_CODE_BEGIN ();\r | |
| 51 | if (IsZeroGuid (PcdGetPtr (PcdCpuRngSupportedAlgorithm))) {\r | |
| 52 | DEBUG ((\r | |
| 53 | DEBUG_WARN,\r | |
| 54 | "PcdCpuRngSupportedAlgorithm should be a non-zero GUID\n"\r | |
| 55 | ));\r | |
| 56 | }\r | |
| 57 | \r | |
| 58 | DEBUG_CODE_END ();\r | |
| 59 | }\r | |
| 60 | \r | |
| 61 | // Raw algorithm (Trng)\r | |
| 62 | if (!EFI_ERROR (GetArmTrngVersion (&MajorRevision, &MinorRevision))) {\r | |
| 63 | CopyMem (\r | |
| 64 | &mAvailableAlgoArray[mAvailableAlgoArrayCount],\r | |
| 65 | &gEfiRngAlgorithmRaw,\r | |
| 66 | sizeof (EFI_RNG_ALGORITHM)\r | |
| 67 | );\r | |
| 68 | mAvailableAlgoArrayCount++;\r | |
| 69 | }\r | |
| 70 | \r | |
| 71 | return EFI_SUCCESS;\r | |
| 72 | }\r |