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a746ca5b TL |
1 | /** @file\r |
2 | \r | |
3 | Virtual Memory Management Services to set or clear the memory encryption bit\r | |
4 | \r | |
5 | Copyright (c) 2020, AMD Incorporated. All rights reserved.<BR>\r | |
6 | \r | |
7 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
8 | \r | |
9 | **/\r | |
10 | \r | |
11 | #include <Library/CpuLib.h>\r | |
12 | #include <Library/MemEncryptSevLib.h>\r | |
13 | \r | |
14 | #include "VirtualMemory.h"\r | |
15 | \r | |
c330af02 TL |
16 | /**\r |
17 | Return the pagetable memory encryption mask.\r | |
18 | \r | |
19 | @return The pagetable memory encryption mask.\r | |
20 | \r | |
21 | **/\r | |
22 | UINT64\r | |
23 | EFIAPI\r | |
24 | InternalGetMemEncryptionAddressMask (\r | |
25 | VOID\r | |
26 | )\r | |
27 | {\r | |
ac0a286f | 28 | UINT64 EncryptionMask;\r |
c330af02 | 29 | \r |
ac0a286f | 30 | EncryptionMask = MemEncryptSevGetEncryptionMask ();\r |
c330af02 TL |
31 | EncryptionMask &= PAGING_1G_ADDRESS_MASK_64;\r |
32 | \r | |
33 | return EncryptionMask;\r | |
34 | }\r | |
35 | \r | |
a746ca5b TL |
36 | /**\r |
37 | This function clears memory encryption bit for the memory region specified by\r | |
38 | PhysicalAddress and Length from the current page table context.\r | |
39 | \r | |
40 | @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r | |
41 | current CR3)\r | |
42 | @param[in] PhysicalAddress The physical address that is the start\r | |
43 | address of a memory region.\r | |
44 | @param[in] Length The length of memory region\r | |
a746ca5b TL |
45 | \r |
46 | @retval RETURN_SUCCESS The attributes were cleared for the\r | |
47 | memory region.\r | |
48 | @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r | |
49 | @retval RETURN_UNSUPPORTED Clearing the memory encyrption attribute\r | |
50 | is not supported\r | |
51 | **/\r | |
52 | RETURN_STATUS\r | |
53 | EFIAPI\r | |
54 | InternalMemEncryptSevSetMemoryDecrypted (\r | |
ac0a286f MK |
55 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r |
56 | IN PHYSICAL_ADDRESS PhysicalAddress,\r | |
57 | IN UINTN Length\r | |
a746ca5b TL |
58 | )\r |
59 | {\r | |
60 | //\r | |
61 | // This function is not available during SEC.\r | |
62 | //\r | |
63 | return RETURN_UNSUPPORTED;\r | |
64 | }\r | |
65 | \r | |
66 | /**\r | |
67 | This function sets memory encryption bit for the memory region specified by\r | |
68 | PhysicalAddress and Length from the current page table context.\r | |
69 | \r | |
70 | @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r | |
71 | current CR3)\r | |
72 | @param[in] PhysicalAddress The physical address that is the start\r | |
73 | address of a memory region.\r | |
74 | @param[in] Length The length of memory region\r | |
75 | @param[in] Flush Flush the caches before applying the\r | |
76 | encryption mask\r | |
77 | \r | |
78 | @retval RETURN_SUCCESS The attributes were set for the memory\r | |
79 | region.\r | |
80 | @retval RETURN_INVALID_PARAMETER Number of pages is zero.\r | |
81 | @retval RETURN_UNSUPPORTED Setting the memory encyrption attribute\r | |
82 | is not supported\r | |
83 | **/\r | |
84 | RETURN_STATUS\r | |
85 | EFIAPI\r | |
86 | InternalMemEncryptSevSetMemoryEncrypted (\r | |
ac0a286f MK |
87 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r |
88 | IN PHYSICAL_ADDRESS PhysicalAddress,\r | |
89 | IN UINTN Length\r | |
a746ca5b TL |
90 | )\r |
91 | {\r | |
92 | //\r | |
93 | // This function is not available during SEC.\r | |
94 | //\r | |
95 | return RETURN_UNSUPPORTED;\r | |
96 | }\r | |
901a9bfc BS |
97 | \r |
98 | /**\r | |
99 | This function clears memory encryption bit for the MMIO region specified by\r | |
100 | PhysicalAddress and Length.\r | |
101 | \r | |
102 | @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use\r | |
103 | current CR3)\r | |
104 | @param[in] PhysicalAddress The physical address that is the start\r | |
105 | address of a MMIO region.\r | |
106 | @param[in] Length The length of memory region\r | |
107 | \r | |
108 | @retval RETURN_SUCCESS The attributes were cleared for the\r | |
109 | memory region.\r | |
110 | @retval RETURN_INVALID_PARAMETER Length is zero.\r | |
111 | @retval RETURN_UNSUPPORTED Clearing the memory encyrption attribute\r | |
112 | is not supported\r | |
113 | **/\r | |
114 | RETURN_STATUS\r | |
115 | EFIAPI\r | |
116 | InternalMemEncryptSevClearMmioPageEncMask (\r | |
ac0a286f MK |
117 | IN PHYSICAL_ADDRESS Cr3BaseAddress,\r |
118 | IN PHYSICAL_ADDRESS PhysicalAddress,\r | |
119 | IN UINTN Length\r | |
901a9bfc BS |
120 | )\r |
121 | {\r | |
122 | //\r | |
123 | // This function is not available during SEC.\r | |
124 | //\r | |
125 | return RETURN_UNSUPPORTED;\r | |
126 | }\r |