UefiCpuPkg/CpuDxe: Enable protection for newly added page table
[mirror_edk2.git] / UefiCpuPkg / Library / SmmCpuPlatformHookLibNull / SmmCpuPlatformHookLibNull.c
1 /** @file
2 SMM CPU Platform Hook NULL library instance.
3
4 Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14 #include <PiSmm.h>
15 #include <Library/SmmCpuPlatformHookLib.h>
16
17 /**
18 Checks if platform produces a valid SMI.
19
20 This function checks if platform produces a valid SMI. This function is
21 called at SMM entry to detect if this is a spurious SMI. This function
22 must be implemented in an MP safe way because it is called by multiple CPU
23 threads.
24
25 @retval TRUE There is a valid SMI
26 @retval FALSE There is no valid SMI
27
28 **/
29 BOOLEAN
30 EFIAPI
31 PlatformValidSmi (
32 VOID
33 )
34 {
35 return TRUE;
36 }
37
38 /**
39 Clears platform top level SMI status bit.
40
41 This function clears platform top level SMI status bit.
42
43 @retval TRUE The platform top level SMI status is cleared.
44 @retval FALSE The platform top level SMI status cannot be cleared.
45
46 **/
47 BOOLEAN
48 EFIAPI
49 ClearTopLevelSmiStatus (
50 VOID
51 )
52 {
53 return TRUE;
54 }
55
56 /**
57 Performs platform specific way of SMM BSP election.
58
59 This function performs platform specific way of SMM BSP election.
60
61 @param IsBsp Output parameter. TRUE: the CPU this function executes
62 on is elected to be the SMM BSP. FALSE: the CPU this
63 function executes on is to be SMM AP.
64
65 @retval EFI_SUCCESS The function executes successfully.
66 @retval EFI_NOT_READY The function does not determine whether this CPU should be
67 BSP or AP. This may occur if hardware init sequence to
68 enable the determination is yet to be done, or the function
69 chooses not to do BSP election and will let SMM CPU driver to
70 use its default BSP election process.
71 @retval EFI_DEVICE_ERROR The function cannot determine whether this CPU should be
72 BSP or AP due to hardware error.
73
74 **/
75 EFI_STATUS
76 EFIAPI
77 PlatformSmmBspElection (
78 OUT BOOLEAN *IsBsp
79 )
80 {
81 return EFI_NOT_READY;
82 }
83
84 /**
85 Get platform page table attribute.
86
87 This function gets page table attribute of platform.
88
89 @param Address Input parameter. Obtain the page table entries attribute on this address.
90 @param PageSize Output parameter. The size of the page.
91 @param NumOfPages Output parameter. Number of page.
92 @param PageAttribute Output parameter. Paging Attributes (WB, UC, etc).
93
94 @retval EFI_SUCCESS The platform page table attribute from the address is determined.
95 @retval EFI_UNSUPPORTED The platform does not support getting page table attribute for the address.
96
97 **/
98 EFI_STATUS
99 EFIAPI
100 GetPlatformPageTableAttribute (
101 IN UINT64 Address,
102 IN OUT SMM_PAGE_SIZE_TYPE *PageSize,
103 IN OUT UINTN *NumOfPages,
104 IN OUT UINTN *PageAttribute
105 )
106 {
107 return EFI_UNSUPPORTED;
108 }