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Diffstat (limited to 'Core/MdePkg/Library/UefiSalLib/UefiSalLib.c')
| -rw-r--r-- | Core/MdePkg/Library/UefiSalLib/UefiSalLib.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/UefiSalLib/UefiSalLib.c b/Core/MdePkg/Library/UefiSalLib/UefiSalLib.c new file mode 100644 index 0000000000..e79c7ce8a9 --- /dev/null +++ b/Core/MdePkg/Library/UefiSalLib/UefiSalLib.c @@ -0,0 +1,139 @@ +/** @file
+ SAL Library implementation retrieving the SAL Entry Point from the SAL System Table
+ register in the EFI System Configuration Table.
+
+ Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>
+ 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 <PiDxe.h>
+#include <IndustryStandard/Sal.h>
+
+#include <Library/SalLib.h>
+#include <Library/UefiLib.h>
+#include <Library/DebugLib.h>
+
+#include <Guid/SalSystemTable.h>
+
+EFI_PLABEL mPlabel;
+SAL_PROC mSalProcEntry;
+
+/**
+ Makes a SAL procedure call.
+
+ This is a wrapper function to make a SAL procedure call.
+ No parameter checking is performed on the 8 input parameters,
+ but there are some common rules that the caller should follow
+ when making a SAL call. Any address passed to SAL as buffers
+ for return parameters must be 8-byte aligned. Unaligned
+ addresses may cause undefined results. For those parameters
+ defined as reserved or some fields defined as reserved must be
+ zero filled or the invalid argument return value may be returned
+ or undefined result may occur during the execution of the procedure.
+ This function is only available on IPF.
+
+ @param Index The SAL procedure Index number.
+ @param Arg2 The 2nd parameter for SAL procedure calls.
+ @param Arg3 The 3rd parameter for SAL procedure calls.
+ @param Arg4 The 4th parameter for SAL procedure calls.
+ @param Arg5 The 5th parameter for SAL procedure calls.
+ @param Arg6 The 6th parameter for SAL procedure calls.
+ @param Arg7 The 7th parameter for SAL procedure calls.
+ @param Arg8 The 8th parameter for SAL procedure calls.
+
+ @return SAL returned registers.
+
+**/
+SAL_RETURN_REGS
+EFIAPI
+SalCall (
+ IN UINT64 Index,
+ IN UINT64 Arg2,
+ IN UINT64 Arg3,
+ IN UINT64 Arg4,
+ IN UINT64 Arg5,
+ IN UINT64 Arg6,
+ IN UINT64 Arg7,
+ IN UINT64 Arg8
+ )
+{
+ //
+ // mSalProcEntry is initialized in library constructor as SAL entry.
+ //
+ return mSalProcEntry(
+ Index,
+ Arg2,
+ Arg3,
+ Arg4,
+ Arg5,
+ Arg6,
+ Arg7,
+ Arg8
+ );
+
+}
+
+/**
+ The constructor function of UEFI SAL Lib.
+
+ The constructor function looks up the SAL System Table in the EFI System Configuration
+ Table. Once the SAL System Table is found, the SAL Entry Point in the SAL System Table
+ will be derived and stored into a global variable for library usage.
+ It will ASSERT() if the SAL System Table cannot be found or the data in the SAL System
+ Table is not the valid data.
+
+ @param ImageHandle The firmware allocated handle for the EFI image.
+ @param SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+UefiSalLibConstructor (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+ SAL_ST_ENTRY_POINT_DESCRIPTOR *SalStEntryDes;
+ SAL_SYSTEM_TABLE_HEADER *SalSystemTable;
+
+ Status = EfiGetSystemConfigurationTable (
+ &gEfiSalSystemTableGuid,
+ (VOID **) &SalSystemTable
+ );
+ ASSERT_EFI_ERROR (Status);
+ ASSERT (SalSystemTable != NULL);
+
+ //
+ // Check the first entry of SAL System Table,
+ // because the SAL entry is in ascending order with the entry type,
+ // the type 0 entry should be the first if exist.
+ //
+ SalStEntryDes = (SAL_ST_ENTRY_POINT_DESCRIPTOR *)(SalSystemTable + 1);
+
+ //
+ // Assure the SAL ENTRY Type is 0
+ //
+ ASSERT (SalStEntryDes->Type == EFI_SAL_ST_ENTRY_POINT);
+
+ mPlabel.EntryPoint = SalStEntryDes->SalProcEntry;
+ mPlabel.GP = SalStEntryDes->SalGlobalDataPointer;
+ //
+ // Make sure the EntryPoint has the valid value
+ //
+ ASSERT ((mPlabel.EntryPoint != 0) && (mPlabel.GP != 0));
+
+ mSalProcEntry = (SAL_PROC)((UINT64)&(mPlabel.EntryPoint));
+
+ return EFI_SUCCESS;
+}
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