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1 | /** @file\r |
2 | \r | |
3 | Secure Encrypted Virtualization (SEV) library helper function\r | |
4 | \r | |
5 | Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r | |
6 | \r | |
b26f0cf9 | 7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
a1f22614 BS |
8 | \r |
9 | **/\r | |
10 | \r | |
11 | #include <Library/BaseLib.h>\r | |
12 | #include <Library/DebugLib.h>\r | |
bd13ecf3 | 13 | #include <Library/MemEncryptSevLib.h>\r |
61a044c6 | 14 | #include <Library/PcdLib.h>\r |
a1f22614 BS |
15 | #include <Register/Amd/Cpuid.h>\r |
16 | #include <Register/Amd/Msr.h>\r | |
bd13ecf3 | 17 | #include <Register/Cpuid.h>\r |
61a044c6 LE |
18 | #include <Register/QemuSmramSaveStateMap.h>\r |
19 | #include <Register/SmramSaveStateMap.h>\r | |
20 | #include <Uefi/UefiBaseType.h>\r | |
a1f22614 BS |
21 | \r |
22 | STATIC BOOLEAN mSevStatus = FALSE;\r | |
23 | STATIC BOOLEAN mSevStatusChecked = FALSE;\r | |
24 | \r | |
25 | /**\r | |
26 | \r | |
27 | Returns a boolean to indicate whether SEV is enabled\r | |
28 | \r | |
29 | @retval TRUE SEV is enabled\r | |
30 | @retval FALSE SEV is not enabled\r | |
31 | **/\r | |
32 | STATIC\r | |
33 | BOOLEAN\r | |
34 | EFIAPI\r | |
35 | InternalMemEncryptSevIsEnabled (\r | |
36 | VOID\r | |
37 | )\r | |
38 | {\r | |
39 | UINT32 RegEax;\r | |
40 | MSR_SEV_STATUS_REGISTER Msr;\r | |
41 | CPUID_MEMORY_ENCRYPTION_INFO_EAX Eax;\r | |
42 | \r | |
43 | //\r | |
44 | // Check if memory encryption leaf exist\r | |
45 | //\r | |
46 | AsmCpuid (CPUID_EXTENDED_FUNCTION, &RegEax, NULL, NULL, NULL);\r | |
47 | if (RegEax >= CPUID_MEMORY_ENCRYPTION_INFO) {\r | |
48 | //\r | |
49 | // CPUID Fn8000_001F[EAX] Bit 1 (Sev supported)\r | |
50 | //\r | |
51 | AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, &Eax.Uint32, NULL, NULL, NULL);\r | |
52 | \r | |
53 | if (Eax.Bits.SevBit) {\r | |
54 | //\r | |
55 | // Check MSR_0xC0010131 Bit 0 (Sev Enabled)\r | |
56 | //\r | |
57 | Msr.Uint32 = AsmReadMsr32 (MSR_SEV_STATUS);\r | |
58 | if (Msr.Bits.SevBit) {\r | |
59 | return TRUE;\r | |
60 | }\r | |
61 | }\r | |
62 | }\r | |
63 | \r | |
64 | return FALSE;\r | |
65 | }\r | |
66 | \r | |
67 | /**\r | |
a1f22614 BS |
68 | Returns a boolean to indicate whether SEV is enabled\r |
69 | \r | |
70 | @retval TRUE SEV is enabled\r | |
71 | @retval FALSE SEV is not enabled\r | |
d4dd22c7 | 72 | **/\r |
a1f22614 BS |
73 | BOOLEAN\r |
74 | EFIAPI\r | |
75 | MemEncryptSevIsEnabled (\r | |
76 | VOID\r | |
77 | )\r | |
78 | {\r | |
79 | if (mSevStatusChecked) {\r | |
80 | return mSevStatus;\r | |
81 | }\r | |
82 | \r | |
83 | mSevStatus = InternalMemEncryptSevIsEnabled();\r | |
84 | mSevStatusChecked = TRUE;\r | |
85 | \r | |
86 | return mSevStatus;\r | |
87 | }\r | |
61a044c6 LE |
88 | \r |
89 | \r | |
90 | /**\r | |
91 | Locate the page range that covers the initial (pre-SMBASE-relocation) SMRAM\r | |
92 | Save State Map.\r | |
93 | \r | |
94 | @param[out] BaseAddress The base address of the lowest-address page that\r | |
95 | covers the initial SMRAM Save State Map.\r | |
96 | \r | |
97 | @param[out] NumberOfPages The number of pages in the page range that covers\r | |
98 | the initial SMRAM Save State Map.\r | |
99 | \r | |
100 | @retval RETURN_SUCCESS BaseAddress and NumberOfPages have been set on\r | |
101 | output.\r | |
102 | \r | |
103 | @retval RETURN_UNSUPPORTED SMM is unavailable.\r | |
104 | **/\r | |
105 | RETURN_STATUS\r | |
106 | EFIAPI\r | |
107 | MemEncryptSevLocateInitialSmramSaveStateMapPages (\r | |
108 | OUT UINTN *BaseAddress,\r | |
109 | OUT UINTN *NumberOfPages\r | |
110 | )\r | |
111 | {\r | |
112 | UINTN MapStart;\r | |
113 | UINTN MapEnd;\r | |
114 | UINTN MapPagesStart; // MapStart rounded down to page boundary\r | |
115 | UINTN MapPagesEnd; // MapEnd rounded up to page boundary\r | |
116 | UINTN MapPagesSize; // difference between MapPagesStart and MapPagesEnd\r | |
117 | \r | |
118 | if (!FeaturePcdGet (PcdSmmSmramRequire)) {\r | |
119 | return RETURN_UNSUPPORTED;\r | |
120 | }\r | |
121 | \r | |
122 | MapStart = SMM_DEFAULT_SMBASE + SMRAM_SAVE_STATE_MAP_OFFSET;\r | |
123 | MapEnd = MapStart + sizeof (QEMU_SMRAM_SAVE_STATE_MAP);\r | |
124 | MapPagesStart = MapStart & ~(UINTN)EFI_PAGE_MASK;\r | |
125 | MapPagesEnd = ALIGN_VALUE (MapEnd, EFI_PAGE_SIZE);\r | |
126 | MapPagesSize = MapPagesEnd - MapPagesStart;\r | |
127 | \r | |
128 | ASSERT ((MapPagesSize & EFI_PAGE_MASK) == 0);\r | |
129 | \r | |
130 | *BaseAddress = MapPagesStart;\r | |
131 | *NumberOfPages = MapPagesSize >> EFI_PAGE_SHIFT;\r | |
132 | \r | |
133 | return RETURN_SUCCESS;\r | |
134 | }\r |