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2ce7e221 LE |
1 | /** @file\r |
2 | \r | |
3 | Stateful and implicitly initialized fw_cfg library implementation.\r | |
4 | \r | |
5 | Copyright (C) 2013, Red Hat, Inc.\r | |
6 | Copyright (c) 2011 - 2013, Intel Corporation. All rights reserved.<BR>\r | |
7 | \r | |
8 | This program and the accompanying materials are licensed and made available\r | |
9 | under the terms and conditions of the BSD License which accompanies this\r | |
10 | distribution. The full text of the license may be found at\r | |
11 | http://opensource.org/licenses/bsd-license.php\r | |
12 | \r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
14 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
15 | **/\r | |
16 | \r | |
17 | #include <Library/DebugLib.h>\r | |
18 | #include <Library/QemuFwCfgLib.h>\r | |
19 | \r | |
5297c0bf LE |
20 | #include "QemuFwCfgLibInternal.h"\r |
21 | \r | |
2ce7e221 | 22 | STATIC BOOLEAN mQemuFwCfgSupported = FALSE;\r |
2c8dcbc6 | 23 | STATIC BOOLEAN mQemuFwCfgDmaSupported;\r |
2ce7e221 LE |
24 | \r |
25 | \r | |
26 | /**\r | |
27 | Returns a boolean indicating if the firmware configuration interface\r | |
28 | is available or not.\r | |
29 | \r | |
30 | This function may change fw_cfg state.\r | |
31 | \r | |
32 | @retval TRUE The interface is available\r | |
33 | @retval FALSE The interface is not available\r | |
34 | \r | |
35 | **/\r | |
36 | BOOLEAN\r | |
37 | EFIAPI\r | |
38 | QemuFwCfgIsAvailable (\r | |
39 | VOID\r | |
40 | )\r | |
41 | {\r | |
42 | return InternalQemuFwCfgIsAvailable ();\r | |
43 | }\r | |
44 | \r | |
45 | \r | |
46 | RETURN_STATUS\r | |
47 | EFIAPI\r | |
48 | QemuFwCfgInitialize (\r | |
49 | VOID\r | |
50 | )\r | |
51 | {\r | |
52 | UINT32 Signature;\r | |
53 | UINT32 Revision;\r | |
54 | \r | |
55 | //\r | |
56 | // Enable the access routines while probing to see if it is supported.\r | |
2c8dcbc6 | 57 | // For probing we always use the IO Port (IoReadFifo8()) access method.\r |
2ce7e221 LE |
58 | //\r |
59 | mQemuFwCfgSupported = TRUE;\r | |
2c8dcbc6 | 60 | mQemuFwCfgDmaSupported = FALSE;\r |
2ce7e221 LE |
61 | \r |
62 | QemuFwCfgSelectItem (QemuFwCfgItemSignature);\r | |
63 | Signature = QemuFwCfgRead32 ();\r | |
64 | DEBUG ((EFI_D_INFO, "FW CFG Signature: 0x%x\n", Signature));\r | |
65 | QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);\r | |
66 | Revision = QemuFwCfgRead32 ();\r | |
67 | DEBUG ((EFI_D_INFO, "FW CFG Revision: 0x%x\n", Revision));\r | |
68 | if ((Signature != SIGNATURE_32 ('Q', 'E', 'M', 'U')) ||\r | |
69 | (Revision < 1)\r | |
70 | ) {\r | |
71 | DEBUG ((EFI_D_INFO, "QemuFwCfg interface not supported.\n"));\r | |
72 | mQemuFwCfgSupported = FALSE;\r | |
73 | return RETURN_SUCCESS;\r | |
74 | }\r | |
75 | \r | |
2c8dcbc6 LE |
76 | if ((Revision & FW_CFG_F_DMA) == 0) {\r |
77 | DEBUG ((DEBUG_INFO, "QemuFwCfg interface (IO Port) is supported.\n"));\r | |
78 | } else {\r | |
79 | mQemuFwCfgDmaSupported = TRUE;\r | |
80 | DEBUG ((DEBUG_INFO, "QemuFwCfg interface (DMA) is supported.\n"));\r | |
81 | }\r | |
2ce7e221 LE |
82 | return RETURN_SUCCESS;\r |
83 | }\r | |
84 | \r | |
85 | \r | |
86 | /**\r | |
87 | Returns a boolean indicating if the firmware configuration interface is\r | |
88 | available for library-internal purposes.\r | |
89 | \r | |
90 | This function never changes fw_cfg state.\r | |
91 | \r | |
92 | @retval TRUE The interface is available internally.\r | |
93 | @retval FALSE The interface is not available internally.\r | |
94 | **/\r | |
95 | BOOLEAN\r | |
2ce7e221 LE |
96 | InternalQemuFwCfgIsAvailable (\r |
97 | VOID\r | |
98 | )\r | |
99 | {\r | |
100 | return mQemuFwCfgSupported;\r | |
101 | }\r | |
2c8dcbc6 LE |
102 | \r |
103 | /**\r | |
104 | Returns a boolean indicating whether QEMU provides the DMA-like access method\r | |
105 | for fw_cfg.\r | |
106 | \r | |
107 | @retval TRUE The DMA-like access method is available.\r | |
108 | @retval FALSE The DMA-like access method is unavailable.\r | |
109 | **/\r | |
110 | BOOLEAN\r | |
111 | InternalQemuFwCfgDmaIsAvailable (\r | |
112 | VOID\r | |
113 | )\r | |
114 | {\r | |
115 | return mQemuFwCfgDmaSupported;\r | |
116 | }\r |