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c90decb9 LE |
1 | /** @file\r |
2 | \r | |
3 | Stateless fw_cfg library implementation.\r | |
4 | \r | |
5 | Clients must call QemuFwCfgIsAvailable() first.\r | |
6 | \r | |
7 | Copyright (C) 2013, Red Hat, Inc.\r | |
8 | Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>\r | |
6264abc2 | 9 | Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>\r |
c90decb9 LE |
10 | \r |
11 | This program and the accompanying materials are licensed and made available\r | |
12 | under the terms and conditions of the BSD License which accompanies this\r | |
13 | distribution. The full text of the license may be found at\r | |
14 | http://opensource.org/licenses/bsd-license.php\r | |
15 | \r | |
16 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
17 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
18 | **/\r | |
19 | \r | |
20 | #include <Library/DebugLib.h>\r | |
21 | #include <Library/QemuFwCfgLib.h>\r | |
22 | \r | |
5297c0bf | 23 | #include "QemuFwCfgLibInternal.h"\r |
c90decb9 LE |
24 | \r |
25 | /**\r | |
26 | Returns a boolean indicating if the firmware configuration interface\r | |
27 | is available or not.\r | |
28 | \r | |
29 | This function may change fw_cfg state.\r | |
30 | \r | |
31 | @retval TRUE The interface is available\r | |
32 | @retval FALSE The interface is not available\r | |
33 | \r | |
34 | **/\r | |
35 | BOOLEAN\r | |
36 | EFIAPI\r | |
37 | QemuFwCfgIsAvailable (\r | |
38 | VOID\r | |
39 | )\r | |
40 | {\r | |
41 | UINT32 Signature;\r | |
42 | UINT32 Revision;\r | |
43 | \r | |
44 | QemuFwCfgSelectItem (QemuFwCfgItemSignature);\r | |
45 | Signature = QemuFwCfgRead32 ();\r | |
46 | DEBUG ((EFI_D_INFO, "FW CFG Signature: 0x%x\n", Signature));\r | |
47 | QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);\r | |
48 | Revision = QemuFwCfgRead32 ();\r | |
49 | DEBUG ((EFI_D_INFO, "FW CFG Revision: 0x%x\n", Revision));\r | |
50 | if ((Signature != SIGNATURE_32 ('Q', 'E', 'M', 'U')) ||\r | |
51 | (Revision < 1)\r | |
52 | ) {\r | |
53 | DEBUG ((EFI_D_INFO, "QemuFwCfg interface not supported.\n"));\r | |
54 | return FALSE;\r | |
55 | }\r | |
56 | \r | |
57 | DEBUG ((EFI_D_INFO, "QemuFwCfg interface is supported.\n"));\r | |
58 | return TRUE;\r | |
59 | }\r | |
60 | \r | |
61 | \r | |
62 | /**\r | |
63 | Returns a boolean indicating if the firmware configuration interface is\r | |
64 | available for library-internal purposes.\r | |
65 | \r | |
66 | This function never changes fw_cfg state.\r | |
67 | \r | |
68 | @retval TRUE The interface is available internally.\r | |
69 | @retval FALSE The interface is not available internally.\r | |
70 | **/\r | |
71 | BOOLEAN\r | |
c90decb9 LE |
72 | InternalQemuFwCfgIsAvailable (\r |
73 | VOID\r | |
74 | )\r | |
75 | {\r | |
76 | //\r | |
77 | // We always return TRUE, because the consumer of this library ought to have\r | |
78 | // called QemuFwCfgIsAvailable before making other calls which would hit this\r | |
79 | // path.\r | |
80 | //\r | |
81 | return TRUE;\r | |
82 | }\r | |
2c8dcbc6 LE |
83 | \r |
84 | /**\r | |
85 | Returns a boolean indicating whether QEMU provides the DMA-like access method\r | |
86 | for fw_cfg.\r | |
87 | \r | |
88 | @retval TRUE The DMA-like access method is available.\r | |
89 | @retval FALSE The DMA-like access method is unavailable.\r | |
90 | **/\r | |
91 | BOOLEAN\r | |
92 | InternalQemuFwCfgDmaIsAvailable (\r | |
93 | VOID\r | |
94 | )\r | |
95 | {\r | |
96 | return FALSE;\r | |
97 | }\r | |
6264abc2 BS |
98 | \r |
99 | /**\r | |
100 | \r | |
101 | Returns a boolean indicating whether SEV is enabled\r | |
102 | \r | |
103 | @retval TRUE SEV is enabled\r | |
104 | @retval FALSE SEV is disabled\r | |
105 | **/\r | |
106 | BOOLEAN\r | |
107 | InternalQemuFwCfgSevIsEnabled (\r | |
108 | VOID\r | |
109 | )\r | |
110 | {\r | |
111 | //\r | |
112 | // DMA is not supported in SEC phase hence SEV support is irrelevant\r | |
113 | //\r | |
114 | return FALSE;\r | |
115 | }\r | |
116 | \r | |
117 | /**\r | |
118 | Allocate a bounce buffer for SEV DMA.\r | |
119 | \r | |
120 | @param[in] NumPage Number of pages.\r | |
121 | @param[out] Buffer Allocated DMA Buffer pointer\r | |
122 | \r | |
123 | **/\r | |
124 | VOID\r | |
125 | InternalQemuFwCfgSevDmaAllocateBuffer (\r | |
126 | OUT VOID **Buffer,\r | |
127 | IN UINT32 NumPages\r | |
128 | )\r | |
129 | {\r | |
130 | //\r | |
131 | // We should never reach here\r | |
132 | //\r | |
133 | ASSERT (FALSE);\r | |
134 | }\r | |
135 | \r | |
136 | /**\r | |
137 | Free the DMA buffer allocated using InternalQemuFwCfgSevDmaAllocateBuffer\r | |
138 | \r | |
139 | @param[in] NumPage Number of pages.\r | |
140 | @param[in] Buffer DMA Buffer pointer\r | |
141 | \r | |
142 | **/\r | |
143 | VOID\r | |
144 | InternalQemuFwCfgSevDmaFreeBuffer (\r | |
145 | IN VOID *Buffer,\r | |
146 | IN UINT32 NumPages\r | |
147 | )\r | |
148 | {\r | |
149 | //\r | |
150 | // We should never reach here\r | |
151 | //\r | |
152 | ASSERT (FALSE);\r | |
153 | }\r |