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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 | |
9 | \r | |
10 | This program and the accompanying materials are licensed and made available\r | |
11 | under the terms and conditions of the BSD License which accompanies this\r | |
12 | distribution. The full text of the license may be found at\r | |
13 | http://opensource.org/licenses/bsd-license.php\r | |
14 | \r | |
15 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
16 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
17 | **/\r | |
18 | \r | |
19 | #include <Library/DebugLib.h>\r | |
20 | #include <Library/QemuFwCfgLib.h>\r | |
21 | \r | |
5297c0bf | 22 | #include "QemuFwCfgLibInternal.h"\r |
c90decb9 LE |
23 | \r |
24 | /**\r | |
25 | Returns a boolean indicating if the firmware configuration interface\r | |
26 | is available or not.\r | |
27 | \r | |
28 | This function may change fw_cfg state.\r | |
29 | \r | |
30 | @retval TRUE The interface is available\r | |
31 | @retval FALSE The interface is not available\r | |
32 | \r | |
33 | **/\r | |
34 | BOOLEAN\r | |
35 | EFIAPI\r | |
36 | QemuFwCfgIsAvailable (\r | |
37 | VOID\r | |
38 | )\r | |
39 | {\r | |
40 | UINT32 Signature;\r | |
41 | UINT32 Revision;\r | |
42 | \r | |
43 | QemuFwCfgSelectItem (QemuFwCfgItemSignature);\r | |
44 | Signature = QemuFwCfgRead32 ();\r | |
45 | DEBUG ((EFI_D_INFO, "FW CFG Signature: 0x%x\n", Signature));\r | |
46 | QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);\r | |
47 | Revision = QemuFwCfgRead32 ();\r | |
48 | DEBUG ((EFI_D_INFO, "FW CFG Revision: 0x%x\n", Revision));\r | |
49 | if ((Signature != SIGNATURE_32 ('Q', 'E', 'M', 'U')) ||\r | |
50 | (Revision < 1)\r | |
51 | ) {\r | |
52 | DEBUG ((EFI_D_INFO, "QemuFwCfg interface not supported.\n"));\r | |
53 | return FALSE;\r | |
54 | }\r | |
55 | \r | |
56 | DEBUG ((EFI_D_INFO, "QemuFwCfg interface is supported.\n"));\r | |
57 | return TRUE;\r | |
58 | }\r | |
59 | \r | |
60 | \r | |
61 | /**\r | |
62 | Returns a boolean indicating if the firmware configuration interface is\r | |
63 | available for library-internal purposes.\r | |
64 | \r | |
65 | This function never changes fw_cfg state.\r | |
66 | \r | |
67 | @retval TRUE The interface is available internally.\r | |
68 | @retval FALSE The interface is not available internally.\r | |
69 | **/\r | |
70 | BOOLEAN\r | |
c90decb9 LE |
71 | InternalQemuFwCfgIsAvailable (\r |
72 | VOID\r | |
73 | )\r | |
74 | {\r | |
75 | //\r | |
76 | // We always return TRUE, because the consumer of this library ought to have\r | |
77 | // called QemuFwCfgIsAvailable before making other calls which would hit this\r | |
78 | // path.\r | |
79 | //\r | |
80 | return TRUE;\r | |
81 | }\r | |
2c8dcbc6 LE |
82 | \r |
83 | /**\r | |
84 | Returns a boolean indicating whether QEMU provides the DMA-like access method\r | |
85 | for fw_cfg.\r | |
86 | \r | |
87 | @retval TRUE The DMA-like access method is available.\r | |
88 | @retval FALSE The DMA-like access method is unavailable.\r | |
89 | **/\r | |
90 | BOOLEAN\r | |
91 | InternalQemuFwCfgDmaIsAvailable (\r | |
92 | VOID\r | |
93 | )\r | |
94 | {\r | |
95 | return FALSE;\r | |
96 | }\r |