mirror of https://github.com/acidanthera/audk.git
Add PeiServiceTablePointerLib that uses KR1 to save/restore the PEI Services Table Pointer
This library is only valid for Ipf git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1993 6f19259b-4bc3-4df7-8a09-765794883524
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mdkinney
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//++
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//
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// Copyright (c) 2006 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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//
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//
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// Module Name:
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//
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// ReadKr1.s
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//
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// Abstract:
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//
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// Contains assembly code for read Kr1.
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//
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//--
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.file "ReadKr1.s"
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#include "IpfMacro.i"
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//---------------------------------------------------------------------------------
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//++
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// AsmReadKr1
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//
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// This routine is used to get KR1. KR1 is used to store Pei Service Table
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// Pointer in archeture.
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//
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// Arguments :
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//
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// On Entry : None.
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//
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// Return Value: Pei Services Table.
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//
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//--
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//----------------------------------------------------------------------------------
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PROCEDURE_ENTRY (AsmReadKr1)
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mov r8 = ar.k1;; // Pei Services Table Pointer
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br.ret.dpnt b0;;
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PROCEDURE_EXIT (AsmReadKr1)
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//++
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//
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// Copyright (c) 2006 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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//
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//
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// Module Name:
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//
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// WriteKr1.s
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//
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// Abstract:
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//
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// Contains assembly code for write Kr1.
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//
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//--
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.file "WriteKr1.s"
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#include "IpfMacro.i"
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//---------------------------------------------------------------------------------
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//++
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// AsmWriteKr1
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//
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// This routine is used to Write KR1. KR1 is used to store Pei Service Table
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// Pointer in archeture.
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//
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// Arguments : r32 Pei Services Table Pointer
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//
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// On Entry : None.
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//
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// Return Value: None.
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//
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//--
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//----------------------------------------------------------------------------------
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PROCEDURE_ENTRY (AsmWriteKr1)
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mov ar.k1 = r32;; // Pei Services Table Pointer
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br.ret.dpnt b0;;
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PROCEDURE_EXIT (AsmWriteKr1)
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/*++
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Copyright (c) 2006 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:
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PeiServicesTablePointer.c
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Abstract:
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PEI Services Table Pointer Library.
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--*/
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/**
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Reads the current value of Kr1.
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@return The current value of Kr1.
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**/
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UINT64
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EFIAPI
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AsmReadKr1 (
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VOID
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);
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/**
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Writes the current value of Kr1.
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@param Value The 64-bit value to write to Kr1.
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**/
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VOID
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EFIAPI
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AsmWriteKr1 (
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IN UINT64 Value
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);
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/**
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The function returns the pointer to PeiServices.
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The function returns the pointer to PeiServices.
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It will ASSERT() if the pointer to PeiServices is NULL.
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@retval The pointer to PeiServices.
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**/
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EFI_PEI_SERVICES **
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EFIAPI
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GetPeiServicesTablePointer (
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VOID
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)
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{
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EFI_PEI_SERVICES **PeiServices;
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PeiServices = (EFI_PEI_SERVICES **)(UINTN)AsmReadKr1 ();
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ASSERT (PeiServices != NULL);
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return PeiServices;
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}
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/**
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The constructor function caches the pointer to PEI services.
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The constructor function caches the pointer to PEI services.
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It will always return EFI_SUCCESS.
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@param FfsHeader Pointer to FFS header the loaded driver.
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@param PeiServices Pointer to the PEI services.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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PeiServicesTablePointerLibConstructor (
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IN EFI_FFS_FILE_HEADER *FfsHeader,
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IN EFI_PEI_SERVICES **PeiServices
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)
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{
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AsmWriteKr1 ((UINT64)(UINTN)PeiServices);
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return EFI_SUCCESS;
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}
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@ -0,0 +1,51 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<ModuleSurfaceArea xmlns="http://www.TianoCore.org/2006/Edk2.0">
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<MsaHeader>
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<ModuleName>PeiServicesTablePointerLibKr1</ModuleName>
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<ModuleType>PEIM</ModuleType>
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<GuidValue>C5F16B67-888F-44ba-ABDB-C2354FB63C49</GuidValue>
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<Version>1.0</Version>
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<Abstract>Component description file for IPF KR1 Pei Services Table Pointer Library</Abstract>
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<Description>PEI Services Table Library implementation that retrieves a pointer to the PEI
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Services Table from the KR1 register on IPF.</Description>
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<Copyright>Copyright (c) 2006, Intel Corporation.</Copyright>
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<License>All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.</License>
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<Specification>FRAMEWORK_BUILD_PACKAGING_SPECIFICATION 0x00000052</Specification>
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</MsaHeader>
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<ModuleDefinitions>
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<SupportedArchitectures>IPF</SupportedArchitectures>
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<BinaryModule>false</BinaryModule>
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<OutputFileBasename>PeiServicesTablePointerLibKr1</OutputFileBasename>
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</ModuleDefinitions>
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<LibraryClassDefinitions>
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<LibraryClass Usage="ALWAYS_PRODUCED">
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<Keyword>PeiServicesTablePointerLib</Keyword>
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</LibraryClass>
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<LibraryClass Usage="ALWAYS_CONSUMED">
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<Keyword>BaseLib</Keyword>
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</LibraryClass>
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<LibraryClass Usage="ALWAYS_CONSUMED">
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<Keyword>DebugLib</Keyword>
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</LibraryClass>
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</LibraryClassDefinitions>
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<SourceFiles>
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<Filename>PeiServicesTablePointer.c</Filename>
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<Filename SupArchList="IPF">Ipf/ReadKr1.s</Filename>
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<Filename SupArchList="IPF">Ipf/WriteKr1.s</Filename>
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</SourceFiles>
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<PackageDependencies>
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<Package PackageGuid="5e0e9358-46b6-4ae2-8218-4ab8b9bbdcec"/>
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</PackageDependencies>
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<Externs>
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<Specification>EFI_SPECIFICATION_VERSION 0x00020000</Specification>
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<Specification>EDK_RELEASE_VERSION 0x00020000</Specification>
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<Extern>
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<Constructor>PeiServicesTablePointerLibConstructor</Constructor>
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</Extern>
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</Externs>
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</ModuleSurfaceArea>
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