75a3814159
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7360 6f19259b-4bc3-4df7-8a09-765794883524
128 lines
4.4 KiB
C
128 lines
4.4 KiB
C
/** @file
|
|
PAL Library implementation retrieving the PAL Entry Point from the SAL System Table
|
|
register in the EFI System Confguration Table.
|
|
|
|
Copyright (c) 2007 - 2008, Intel Corporation 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 <PiDxe.h>
|
|
|
|
#include <IndustryStandard/Sal.h>
|
|
#include <Library/UefiLib.h>
|
|
#include <Library/BaseLib.h>
|
|
#include <Library/DebugLib.h>
|
|
|
|
#include <Guid/SalSystemTable.h>
|
|
|
|
UINT64 mPalProcEntry;
|
|
|
|
/**
|
|
Makes a PAL procedure call.
|
|
|
|
This is a wrapper function to make a PAL procedure call. Based on the Index value,
|
|
this API will make static or stacked PAL call. Architected procedures may be designated
|
|
as required or optional. If a PAL procedure is specified as optional, a unique return
|
|
code of 0xFFFFFFFFFFFFFFFF is returned in the Status field of the PAL_CALL_RETURN structure.
|
|
This indicates that the procedure is not present in this PAL implementation. It is the
|
|
caller's responsibility to check for this return code after calling any optional PAL
|
|
procedure. No parameter checking is performed on the 4 input parameters, but there are
|
|
some common rules that the caller should follow when making a PAL call. Any address
|
|
passed to PAL 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 PAL procedure Index number.
|
|
@param Arg2 The 2nd parameter for PAL procedure calls.
|
|
@param Arg3 The 3rd parameter for PAL procedure calls.
|
|
@param Arg4 The 4th parameter for PAL procedure calls.
|
|
|
|
@return Structure returned from the PAL Call procedure, including the status and return value.
|
|
|
|
**/
|
|
PAL_CALL_RETURN
|
|
EFIAPI
|
|
PalCall (
|
|
IN UINT64 Index,
|
|
IN UINT64 Arg2,
|
|
IN UINT64 Arg3,
|
|
IN UINT64 Arg4
|
|
)
|
|
{
|
|
//
|
|
// mPalProcEntry is initialized in library constructor as PAL entry.
|
|
//
|
|
return AsmPalCall (
|
|
mPalProcEntry,
|
|
Index,
|
|
Arg2,
|
|
Arg3,
|
|
Arg4
|
|
);
|
|
|
|
}
|
|
|
|
/**
|
|
The constructor function of UEFI Pal Lib.
|
|
|
|
The constructor function looks up the SAL System Table in the EFI System Configuration
|
|
Table. Once the SAL System Table is found, the PAL 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
|
|
UefiPalLibConstructor (
|
|
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);
|
|
|
|
mPalProcEntry = SalStEntryDes->PalProcEntry;
|
|
//
|
|
// Make sure the PalCallAddress has the valid value
|
|
//
|
|
ASSERT (mPalProcEntry != 0);
|
|
|
|
return EFI_SUCCESS;
|
|
}
|