projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 469e1e1e AB |
1 | #/* @file\r |
| 2 | #\r | |
| 3 | # Copyright (c) 2016, Linaro Limited. All rights reserved.\r | |
| 4 | #\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 <Base.h>\r | |
| 16 | \r | |
| 17 | #include <Library/ArmLib.h>\r | |
| 18 | #include <Library/CacheMaintenanceLib.h>\r | |
| 19 | #include <Library/DebugLib.h>\r | |
| 20 | \r | |
| 21 | //\r | |
| 22 | // This is a hack. We define a weak symbol with external linkage, which may or\r | |
| 23 | // may not be overridden by a non-weak alternative that is defined with a non\r | |
| 24 | // zero value in the object that contains the MMU routines. Since static\r | |
| 25 | // libraries are pulled in on a per-object basis, and since the MMU object will\r | |
| 26 | // only be pulled in if any of its other symbols are referenced by the client\r | |
| 27 | // module, we can use the value below to figure out whether the MMU routines are\r | |
| 28 | // in use by this module, and decide whether cache maintenance of the function\r | |
| 29 | // ArmReplaceLiveTranslationEntry () is required.\r | |
| 30 | //\r | |
| 31 | INT32 __attribute__((weak)) HaveMmuRoutines;\r | |
| 32 | \r | |
| 33 | EFI_STATUS\r | |
| 34 | EFIAPI\r | |
| 35 | AArch64LibConstructor (\r | |
| 36 | IN EFI_PEI_FILE_HANDLE FileHandle,\r | |
| 37 | IN CONST EFI_PEI_SERVICES **PeiServices\r | |
| 38 | )\r | |
| 39 | {\r | |
| 40 | extern UINT32 ArmReplaceLiveTranslationEntrySize;\r | |
| 41 | \r | |
| 42 | EFI_FV_FILE_INFO FileInfo;\r | |
| 43 | EFI_STATUS Status;\r | |
| 44 | \r | |
| 45 | if (HaveMmuRoutines == 0) {\r | |
| 46 | return RETURN_SUCCESS;\r | |
| 47 | }\r | |
| 48 | \r | |
| 49 | ASSERT (FileHandle != NULL);\r | |
| 50 | \r | |
| 51 | Status = (*PeiServices)->FfsGetFileInfo (FileHandle, &FileInfo);\r | |
| 52 | ASSERT_EFI_ERROR (Status);\r | |
| 53 | \r | |
| 54 | //\r | |
| 55 | // Some platforms do not cope very well with cache maintenance being\r | |
| 56 | // performed on regions backed by NOR flash. Since the cache maintenance\r | |
| 57 | // is unnecessary to begin with in that case, perform it only when not\r | |
| 58 | // executing in place.\r | |
| 59 | //\r | |
| 60 | if ((UINTN)FileInfo.Buffer <= (UINTN)ArmReplaceLiveTranslationEntry &&\r | |
| 61 | ((UINTN)FileInfo.Buffer + FileInfo.BufferSize >=\r | |
| 62 | (UINTN)ArmReplaceLiveTranslationEntry + ArmReplaceLiveTranslationEntrySize)) {\r | |
| 63 | DEBUG ((EFI_D_INFO, "ArmLib: skipping cache maintence on XIP PEIM\n"));\r | |
| 64 | } else {\r | |
| 65 | DEBUG ((EFI_D_INFO, "ArmLib: performing cache maintence on shadowed PEIM\n"));\r | |
| 66 | //\r | |
| 67 | // The ArmReplaceLiveTranslationEntry () helper function may be invoked\r | |
| 68 | // with the MMU off so we have to ensure that it gets cleaned to the PoC\r | |
| 69 | //\r | |
| 70 | WriteBackDataCacheRange (ArmReplaceLiveTranslationEntry,\r | |
| 71 | ArmReplaceLiveTranslationEntrySize);\r | |
| 72 | }\r | |
| 73 | \r | |
| 74 | return RETURN_SUCCESS;\r | |
| 75 | }\r |