mirror of https://github.com/acidanthera/audk.git
76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
#/* @file
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#
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# Copyright (c) 2016, Linaro Limited. All rights reserved.
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#*/
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#include <Base.h>
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#include <Library/ArmLib.h>
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#include <Library/CacheMaintenanceLib.h>
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#include <Library/DebugLib.h>
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//
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// This is a hack. We define a weak symbol with external linkage, which may or
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// may not be overridden by a non-weak alternative that is defined with a non
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// zero value in the object that contains the MMU routines. Since static
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// libraries are pulled in on a per-object basis, and since the MMU object will
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// only be pulled in if any of its other symbols are referenced by the client
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// module, we can use the value below to figure out whether the MMU routines are
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// in use by this module, and decide whether cache maintenance of the function
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// ArmReplaceLiveTranslationEntry () is required.
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//
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INT32 __attribute__((weak)) HaveMmuRoutines;
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EFI_STATUS
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EFIAPI
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AArch64LibConstructor (
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IN EFI_PEI_FILE_HANDLE FileHandle,
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IN CONST EFI_PEI_SERVICES **PeiServices
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)
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{
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extern UINT32 ArmReplaceLiveTranslationEntrySize;
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EFI_FV_FILE_INFO FileInfo;
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EFI_STATUS Status;
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if (HaveMmuRoutines == 0) {
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return RETURN_SUCCESS;
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}
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ASSERT (FileHandle != NULL);
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Status = (*PeiServices)->FfsGetFileInfo (FileHandle, &FileInfo);
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ASSERT_EFI_ERROR (Status);
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//
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// Some platforms do not cope very well with cache maintenance being
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// performed on regions backed by NOR flash. Since the cache maintenance
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// is unnecessary to begin with in that case, perform it only when not
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// executing in place.
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//
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if ((UINTN)FileInfo.Buffer <= (UINTN)ArmReplaceLiveTranslationEntry &&
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((UINTN)FileInfo.Buffer + FileInfo.BufferSize >=
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(UINTN)ArmReplaceLiveTranslationEntry + ArmReplaceLiveTranslationEntrySize)) {
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DEBUG ((EFI_D_INFO, "ArmLib: skipping cache maintence on XIP PEIM\n"));
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} else {
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DEBUG ((EFI_D_INFO, "ArmLib: performing cache maintence on shadowed PEIM\n"));
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//
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// The ArmReplaceLiveTranslationEntry () helper function may be invoked
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// with the MMU off so we have to ensure that it gets cleaned to the PoC
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//
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WriteBackDataCacheRange (ArmReplaceLiveTranslationEntry,
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ArmReplaceLiveTranslationEntrySize);
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}
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return RETURN_SUCCESS;
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}
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