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102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
/** @file
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PAL Call Services Function.
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Copyright (c) 2006 - 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: PalCallLib.c
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**/
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#include <PiPei.h>
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#include <Ppi/SecPlatformInformation.h>
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#include <Library/PalCallLib.h>
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#include <Library/PeiServicesTablePointerLib.h>
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#include <Library/PeiServicesLib.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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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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UINT64 PalCallAddress;
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PAL_CALL_RETURN ReturnVal;
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CONST EFI_PEI_SERVICES **PeiServices;
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EFI_STATUS Status;
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EFI_SEC_PLATFORM_INFORMATION_PPI *SecPlatformPpi;
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IPF_HANDOFF_STATUS IpfStatus;
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UINT64 RecordSize;
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//
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// Get PEI Service Table Pointer
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//
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PeiServices = GetPeiServicesTablePointer ();
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//
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// Locate SEC Platform Information PPI
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//
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Status = PeiServicesLocatePpi (
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&gEfiSecPlatformInformationPpiGuid,
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0,
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NULL,
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(VOID **)&SecPlatformPpi
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);
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ASSERT_EFI_ERROR (Status);
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//
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// Retrieve PAL call address from platform information reported by the PPI
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//
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RecordSize = sizeof (IpfStatus);
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SecPlatformPpi->PlatformInformation (
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PeiServices,
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&RecordSize,
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(EFI_SEC_PLATFORM_INFORMATION_RECORD *) &IpfStatus
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);
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PalCallAddress = IpfStatus.PalCallAddress;
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ReturnVal = AsmPalCall (PalCallAddress, Index, Arg2, Arg3, Arg4);
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return ReturnVal;
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}
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