mirror of https://github.com/acidanthera/audk.git
140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
/** @file
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SAL Library implementation retrieving the SAL Entry Point from the SAL System Table
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register in the EFI System Configuration Table.
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Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are
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licensed and made available under the terms and conditions of
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the BSD License which accompanies this distribution. The full
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text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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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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#include <PiDxe.h>
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#include <IndustryStandard/Sal.h>
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#include <Library/SalLib.h>
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#include <Library/UefiLib.h>
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#include <Library/DebugLib.h>
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#include <Guid/SalSystemTable.h>
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EFI_PLABEL mPlabel;
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SAL_PROC mSalProcEntry;
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/**
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Makes a SAL procedure call.
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This is a wrapper function to make a SAL procedure call.
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No parameter checking is performed on the 8 input parameters,
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but there are some common rules that the caller should follow
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when making a SAL call. Any address passed to SAL as buffers
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for return parameters must be 8-byte aligned. Unaligned
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addresses may cause undefined results. For those parameters
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defined as reserved or some fields defined as reserved must be
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zero filled or the invalid argument return value may be returned
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or undefined result may occur during the execution of the procedure.
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This function is only available on IPF.
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@param Index The SAL procedure Index number.
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@param Arg2 The 2nd parameter for SAL procedure calls.
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@param Arg3 The 3rd parameter for SAL procedure calls.
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@param Arg4 The 4th parameter for SAL procedure calls.
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@param Arg5 The 5th parameter for SAL procedure calls.
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@param Arg6 The 6th parameter for SAL procedure calls.
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@param Arg7 The 7th parameter for SAL procedure calls.
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@param Arg8 The 8th parameter for SAL procedure calls.
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@return SAL returned registers.
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**/
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SAL_RETURN_REGS
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EFIAPI
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SalCall (
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IN UINT64 Index,
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IN UINT64 Arg2,
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IN UINT64 Arg3,
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IN UINT64 Arg4,
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IN UINT64 Arg5,
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IN UINT64 Arg6,
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IN UINT64 Arg7,
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IN UINT64 Arg8
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)
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{
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//
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// mSalProcEntry is initialized in library constructor as SAL entry.
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//
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return mSalProcEntry(
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Index,
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Arg2,
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Arg3,
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Arg4,
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Arg5,
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Arg6,
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Arg7,
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Arg8
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);
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}
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/**
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The constructor function of UEFI SAL Lib.
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The constructor function looks up the SAL System Table in the EFI System Configuration
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Table. Once the SAL System Table is found, the SAL Entry Point in the SAL System Table
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will be derived and stored into a global variable for library usage.
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It will ASSERT() if the SAL System Table cannot be found or the data in the SAL System
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Table is not the valid data.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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UefiSalLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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SAL_ST_ENTRY_POINT_DESCRIPTOR *SalStEntryDes;
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SAL_SYSTEM_TABLE_HEADER *SalSystemTable;
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Status = EfiGetSystemConfigurationTable (
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&gEfiSalSystemTableGuid,
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(VOID **) &SalSystemTable
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);
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ASSERT_EFI_ERROR (Status);
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ASSERT (SalSystemTable != NULL);
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//
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// Check the first entry of SAL System Table,
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// because the SAL entry is in ascending order with the entry type,
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// the type 0 entry should be the first if exist.
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//
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SalStEntryDes = (SAL_ST_ENTRY_POINT_DESCRIPTOR *)(SalSystemTable + 1);
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//
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// Assure the SAL ENTRY Type is 0
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//
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ASSERT (SalStEntryDes->Type == EFI_SAL_ST_ENTRY_POINT);
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mPlabel.EntryPoint = SalStEntryDes->SalProcEntry;
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mPlabel.GP = SalStEntryDes->SalGlobalDataPointer;
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//
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// Make sure the EntryPoint has the valid value
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//
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ASSERT ((mPlabel.EntryPoint != 0) && (mPlabel.GP != 0));
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mSalProcEntry = (SAL_PROC)((UINT64)&(mPlabel.EntryPoint));
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return EFI_SUCCESS;
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}
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