2b63446b1d
Add SmmCpuPlatformHookLib that provides platform specific functions that are used to initialize SMM and process SMIs. A Null instance of this library is provided that should work for most platforms. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Jeff Fan <jeff.fan@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18639 6f19259b-4bc3-4df7-8a09-765794883524
109 lines
3.4 KiB
C
109 lines
3.4 KiB
C
/** @file
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SMM CPU Platform Hook NULL library instance.
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Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
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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.
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**/
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#include <PiSmm.h>
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#include <Library/SmmCpuPlatformHookLib.h>
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/**
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Checks if platform produces a valid SMI.
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This function checks if platform produces a valid SMI. This function is
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called at SMM entry to detect if this is a spurious SMI. This function
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must be implemented in an MP safe way because it is called by multiple CPU
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threads.
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@retval TRUE There is a valid SMI
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@retval FALSE There is no valid SMI
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**/
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BOOLEAN
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EFIAPI
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PlatformValidSmi (
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VOID
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)
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{
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return TRUE;
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}
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/**
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Clears platform top level SMI status bit.
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This function clears platform top level SMI status bit.
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@retval TRUE The platform top level SMI status is cleared.
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@retval FALSE The platform top level SMI status cannot be cleared.
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**/
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BOOLEAN
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EFIAPI
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ClearTopLevelSmiStatus (
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VOID
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)
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{
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return TRUE;
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}
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/**
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Performs platform specific way of SMM BSP election.
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This function performs platform specific way of SMM BSP election.
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@param IsBsp Output parameter. TRUE: the CPU this function executes
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on is elected to be the SMM BSP. FALSE: the CPU this
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function executes on is to be SMM AP.
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@retval EFI_SUCCESS The function executes successfully.
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@retval EFI_NOT_READY The function does not determine whether this CPU should be
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BSP or AP. This may occur if hardware init sequence to
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enable the determination is yet to be done, or the function
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chooses not to do BSP election and will let SMM CPU driver to
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use its default BSP election process.
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@retval EFI_DEVICE_ERROR The function cannot determine whether this CPU should be
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BSP or AP due to hardware error.
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**/
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EFI_STATUS
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EFIAPI
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PlatformSmmBspElection (
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OUT BOOLEAN *IsBsp
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)
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{
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return EFI_NOT_READY;
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}
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/**
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Get platform page table attribute.
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This function gets page table attribute of platform.
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@param Address Input parameter. Obtain the page table entries attribute on this address.
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@param PageSize Output parameter. The size of the page.
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@param NumOfPages Output parameter. Number of page.
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@param PageAttribute Output parameter. Paging Attributes (WB, UC, etc).
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@retval EFI_SUCCESS The platform page table attribute from the address is determined.
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@retval EFI_UNSUPPORTED The platform does not support getting page table attribute for the address.
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**/
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EFI_STATUS
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EFIAPI
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GetPlatformPageTableAttribute (
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IN UINT64 Address,
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IN OUT SMM_PAGE_SIZE_TYPE *PageSize,
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IN OUT UINTN *NumOfPages,
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IN OUT UINTN *PageAttribute
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)
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{
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return EFI_UNSUPPORTED;
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}
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