diff options
Diffstat (limited to 'InOsEmuPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c')
-rw-r--r-- | InOsEmuPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/InOsEmuPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c b/InOsEmuPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c new file mode 100644 index 0000000000..1c689390f8 --- /dev/null +++ b/InOsEmuPkg/Library/PeiCoreServicesTablePointerLib/PeiServicesTablePointer.c @@ -0,0 +1,102 @@ +/** @file
+ PEI Services Table Pointer Library for PEI Core.
+
+ This library is used for PEI Core which does executed from flash device directly but
+ executed in memory. When the PEI Core does a Set of the PEI Service table pointer
+ a PPI is reinstalled so that PEIMs can update the copy of the PEI Services table
+ they have cached.
+
+ Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+ Portiions copyrigth (c) 2011, Apple Inc. All rights reserved.
+ This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php.
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <PiPei.h>
+#include <Library/PeiServicesTablePointerLib.h>
+#include <Library/DebugLib.h>
+
+#include <Ppi/EmuPeiServicesTableUpdate.h>
+
+
+CONST EFI_PEI_SERVICES **gPeiServices = NULL;
+
+/**
+ Caches a pointer PEI Services Table.
+
+ Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
+ in a CPU specific manner as specified in the CPU binding section of the Platform Initialization
+ Pre-EFI Initialization Core Interface Specification.
+
+ If PeiServicesTablePointer is NULL, then ASSERT().
+
+ @param PeiServicesTablePointer The address of PeiServices pointer.
+**/
+VOID
+EFIAPI
+SetPeiServicesTablePointer (
+ IN CONST EFI_PEI_SERVICES **PeiServicesTablePointer
+ )
+{
+ EFI_STATUS Status;
+ EFI_PEI_PPI_DESCRIPTOR *PpiDescriptor;
+ VOID *NotUsed;
+
+ gPeiServices = PeiServicesTablePointer;
+
+ Status = (*PeiServicesTablePointer)->LocatePpi (
+ PeiServicesTablePointer,
+ &gEmuPeiServicesTableUpdatePpiGuid, // GUID
+ 0, // INSTANCE
+ &PpiDescriptor, // EFI_PEI_PPI_DESCRIPTOR
+ &NotUsed // PPI
+ );
+ if (!EFI_ERROR (Status)) {
+ //
+ // Standard PI Mechanism is to use negative offset from IDT.
+ // We can't do that in the emulator, so we make up a constant location
+ // that every one can use. The first try may fail as the PEI Core is still
+ // initializing its self, but that is OK.
+ //
+
+ // Reinstall PPI to consumers know to update PEI Services pointer
+ Status = (*PeiServicesTablePointer)->ReInstallPpi (
+ PeiServicesTablePointer,
+ PpiDescriptor,
+ PpiDescriptor
+ );
+
+ }
+
+}
+
+/**
+ Retrieves the cached value of the PEI Services Table pointer.
+
+ Returns the cached value of the PEI Services Table pointer in a CPU specific manner
+ as specified in the CPU binding section of the Platform Initialization Pre-EFI
+ Initialization Core Interface Specification.
+
+ If the cached PEI Services Table pointer is NULL, then ASSERT().
+
+ @return The pointer to PeiServices.
+
+**/
+CONST EFI_PEI_SERVICES **
+EFIAPI
+GetPeiServicesTablePointer (
+ VOID
+ )
+{
+ ASSERT (gPeiServices != NULL);
+ ASSERT (*gPeiServices != NULL);
+ return gPeiServices;
+}
+
+
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