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/** @file
PAL Library Class implementation whose PAL entry is collected
from HOB or SAL System Table.
Copyright (c) 2007 - 2008 Intel Corporation. All rights reserved
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.
Module Name: DxePalCallLib.c
**/
#include <PiDxe.h>
#include <ItaniumFamilyCpuDxe.h>
#include <IndustryStandard/Sal.h>
#include <Guid/PalEntryHob.h>
#include <Guid/SalSystemTable.h>
#include <Library/PalCallLib.h>
#include <Library/BaseLib.h>
#include <Library/HobLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiLib.h>
BOOLEAN mPalCallAddressHob = FALSE;
BOOLEAN mPalCallAddressSal = FALSE;
UINT64 mPalCallAddress;
/**
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
)
{
EFI_HOB_GUID_TYPE *GuidHob;
EFI_STATUS Status;
SAL_ST_ENTRY_POINT_DESCRIPTOR *SalStEntryDes;
SAL_SYSTEM_TABLE_HEADER *SalSystemTable;
if (!mPalCallAddressHob) {
//
// Collect PAL entry from HOBs
//
GuidHob = GetFirstGuidHob (&gPalEntryHobGuid);
ASSERT (GuidHob != NULL);
mPalCallAddress = *((EFI_PHYSICAL_ADDRESS *) GET_GUID_HOB_DATA (GuidHob));
ASSERT (mPalCallAddress != 0);
mPalCallAddressHob = TRUE;
}
if (!mPalCallAddressSal) {
Status = EfiGetSystemConfigurationTable (
&gEfiSalSystemTableGuid,
(VOID **) &SalSystemTable
);
if (!EFI_ERROR (Status)) {
//
// Move the SAL System Table point to the first Entry
// Due to 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);
if (SalStEntryDes->PalProcEntry != 0) {
mPalCallAddress = SalStEntryDes->PalProcEntry;
mPalCallAddressSal = TRUE;
}
}
}
return AsmPalCall (mPalCallAddress, Index, Arg2, Arg3, Arg4);
}
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