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1 | /** @file\r | |
2 | SMM CPU Platform Hook library instance for QEMU.\r | |
3 | \r | |
4 | Copyright (c) 2020, Red Hat, Inc.\r | |
5 | Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>\r | |
6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
7 | \r | |
8 | **/\r | |
9 | #include <Library/BaseLib.h> // AsmReadMsr64()\r | |
10 | #include <PiSmm.h>\r | |
11 | #include <Register/Intel/ArchitecturalMsr.h> // MSR_IA32_APIC_BASE_REGISTER\r | |
12 | \r | |
13 | #include <Library/SmmCpuPlatformHookLib.h>\r | |
14 | \r | |
15 | /**\r | |
16 | Checks if platform produces a valid SMI.\r | |
17 | \r | |
18 | This function checks if platform produces a valid SMI. This function is\r | |
19 | called at SMM entry to detect if this is a spurious SMI. This function\r | |
20 | must be implemented in an MP safe way because it is called by multiple CPU\r | |
21 | threads.\r | |
22 | \r | |
23 | @retval TRUE There is a valid SMI\r | |
24 | @retval FALSE There is no valid SMI\r | |
25 | \r | |
26 | **/\r | |
27 | BOOLEAN\r | |
28 | EFIAPI\r | |
29 | PlatformValidSmi (\r | |
30 | VOID\r | |
31 | )\r | |
32 | {\r | |
33 | return TRUE;\r | |
34 | }\r | |
35 | \r | |
36 | /**\r | |
37 | Clears platform top level SMI status bit.\r | |
38 | \r | |
39 | This function clears platform top level SMI status bit.\r | |
40 | \r | |
41 | @retval TRUE The platform top level SMI status is cleared.\r | |
42 | @retval FALSE The platform top level SMI status cannot be\r | |
43 | cleared.\r | |
44 | \r | |
45 | **/\r | |
46 | BOOLEAN\r | |
47 | EFIAPI\r | |
48 | ClearTopLevelSmiStatus (\r | |
49 | VOID\r | |
50 | )\r | |
51 | {\r | |
52 | return TRUE;\r | |
53 | }\r | |
54 | \r | |
55 | /**\r | |
56 | Performs platform specific way of SMM BSP election.\r | |
57 | \r | |
58 | This function performs platform specific way of SMM BSP election.\r | |
59 | \r | |
60 | @param IsBsp Output parameter. TRUE: the CPU this function\r | |
61 | executes on is elected to be the SMM BSP. FALSE:\r | |
62 | the CPU this function executes on is to be SMM AP.\r | |
63 | \r | |
64 | @retval EFI_SUCCESS The function executes successfully.\r | |
65 | @retval EFI_NOT_READY The function does not determine whether this CPU\r | |
66 | should be BSP or AP. This may occur if hardware\r | |
67 | init sequence to enable the determination is yet to\r | |
68 | be done, or the function chooses not to do BSP\r | |
69 | election and will let SMM CPU driver to use its\r | |
70 | default BSP election process.\r | |
71 | @retval EFI_DEVICE_ERROR The function cannot determine whether this CPU\r | |
72 | should be BSP or AP due to hardware error.\r | |
73 | \r | |
74 | **/\r | |
75 | EFI_STATUS\r | |
76 | EFIAPI\r | |
77 | PlatformSmmBspElection (\r | |
78 | OUT BOOLEAN *IsBsp\r | |
79 | )\r | |
80 | {\r | |
81 | MSR_IA32_APIC_BASE_REGISTER ApicBaseMsr;\r | |
82 | \r | |
83 | ApicBaseMsr.Uint64 = AsmReadMsr64 (MSR_IA32_APIC_BASE);\r | |
84 | *IsBsp = (BOOLEAN)(ApicBaseMsr.Bits.BSP == 1);\r | |
85 | return EFI_SUCCESS;\r | |
86 | }\r | |
87 | \r | |
88 | /**\r | |
89 | Get platform page table attribute.\r | |
90 | \r | |
91 | This function gets page table attribute of platform.\r | |
92 | \r | |
93 | @param Address Input parameter. Obtain the page table entries\r | |
94 | attribute on this address.\r | |
95 | @param PageSize Output parameter. The size of the page.\r | |
96 | @param NumOfPages Output parameter. Number of page.\r | |
97 | @param PageAttribute Output parameter. Paging Attributes (WB, UC, etc).\r | |
98 | \r | |
99 | @retval EFI_SUCCESS The platform page table attribute from the address\r | |
100 | is determined.\r | |
101 | @retval EFI_UNSUPPORTED The platform does not support getting page table\r | |
102 | attribute for the address.\r | |
103 | \r | |
104 | **/\r | |
105 | EFI_STATUS\r | |
106 | EFIAPI\r | |
107 | GetPlatformPageTableAttribute (\r | |
108 | IN UINT64 Address,\r | |
109 | IN OUT SMM_PAGE_SIZE_TYPE *PageSize,\r | |
110 | IN OUT UINTN *NumOfPages,\r | |
111 | IN OUT UINTN *PageAttribute\r | |
112 | )\r | |
113 | {\r | |
114 | return EFI_UNSUPPORTED;\r | |
115 | }\r |