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/** @file
Provides library services to make PAL Calls.
The PAL Library provides a service to make a PAL CALL. This service is identical
in functionality to AsmPalCall() in the Itanium specific functions of the Base Library.
The only difference is that the PAL Entry Point is not passed in. Implementations
of this library class must manage PAL Entry Point on their own. For example, a PEI
implementation can use a PPI to lookup the PAL Entry Point, and a DXE implementation
can contain a constructor to look up the PAL Entry Point from a HOB. This library class
is only available on IPF.
Copyright (c) 2006 -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.
**/
#ifndef __PAL_CALL_LIB_H__
#define __PAL_CALL_LIB_H__
#include <IndustryStandard/Pal.h>
/**
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
);
#endif
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