mirror of https://github.com/acidanthera/audk.git
117 lines
4.0 KiB
C
117 lines
4.0 KiB
C
/** @file
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PAL Library Class implementation whose PAL entry is collected
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from HOB or SAL System Table.
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Copyright (c) 2007 - 2008 Intel Corporation. All rights reserved
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This software and associated documentation (if any) is furnished
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under a license and may only be used or copied in accordance
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with the terms of the license. Except as permitted by such
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license, no part of this software or documentation may be
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reproduced, stored in a retrieval system, or transmitted in any
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form or by any means without the express written consent of
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Intel Corporation.
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Module Name: DxePalCallLib.c
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**/
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#include <PiDxe.h>
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#include <ItaniumFamilyCpuDxe.h>
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#include <IndustryStandard/Sal.h>
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#include <Guid/PalEntryHob.h>
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#include <Guid/SalSystemTable.h>
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#include <Library/PalCallLib.h>
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#include <Library/BaseLib.h>
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#include <Library/HobLib.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiLib.h>
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BOOLEAN mPalCallAddressHob = FALSE;
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BOOLEAN mPalCallAddressSal = FALSE;
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UINT64 mPalCallAddress;
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/**
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Makes a PAL procedure call.
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This is a wrapper function to make a PAL procedure call. Based on the Index value,
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this API will make static or stacked PAL call. Architected procedures may be designated
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as required or optional. If a PAL procedure is specified as optional, a unique return
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code of 0xFFFFFFFFFFFFFFFF is returned in the Status field of the PAL_CALL_RETURN structure.
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This indicates that the procedure is not present in this PAL implementation. It is the
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caller's responsibility to check for this return code after calling any optional PAL
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procedure. No parameter checking is performed on the 4 input parameters, but there are
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some common rules that the caller should follow when making a PAL call. Any address
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passed to PAL as buffers for return parameters must be 8-byte aligned. Unaligned addresses
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may cause undefined results. For those parameters defined as reserved or some fields
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defined as reserved must be zero filled or the invalid argument return value may be
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returned 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 PAL procedure Index number.
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@param Arg2 The 2nd parameter for PAL procedure calls.
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@param Arg3 The 3rd parameter for PAL procedure calls.
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@param Arg4 The 4th parameter for PAL procedure calls.
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@return Structure returned from the PAL Call procedure, including the status and return value.
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**/
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PAL_CALL_RETURN
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EFIAPI
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PalCall (
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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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)
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{
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EFI_HOB_GUID_TYPE *GuidHob;
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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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if (!mPalCallAddressHob) {
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//
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// Collect PAL entry from HOBs
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//
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GuidHob = GetFirstGuidHob (&gPalEntryHobGuid);
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ASSERT (GuidHob != NULL);
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mPalCallAddress = *((EFI_PHYSICAL_ADDRESS *) GET_GUID_HOB_DATA (GuidHob));
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ASSERT (mPalCallAddress != 0);
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mPalCallAddressHob = TRUE;
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}
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if (!mPalCallAddressSal) {
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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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if (!EFI_ERROR (Status)) {
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//
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// Move the SAL System Table point to the first Entry
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// Due to 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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if (SalStEntryDes->PalProcEntry != 0) {
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mPalCallAddress = SalStEntryDes->PalProcEntry;
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mPalCallAddressSal = TRUE;
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}
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}
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}
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return AsmPalCall (mPalCallAddress, Index, Arg2, Arg3, Arg4);
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}
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