projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| 20 | STATIC BOOLEAN mQemuFwCfgSupported = FALSE;\r | |
| 21 | \r | |
| 22 | \r | |
| 23 | /**\r | |
| 24 | Returns a boolean indicating if the firmware configuration interface\r | |
| 25 | is available or not.\r | |
| 26 | \r | |
| 27 | This function may change fw_cfg state.\r | |
| 28 | \r | |
| 29 | @retval TRUE The interface is available\r | |
| 30 | @retval FALSE The interface is not available\r | |
| 31 | \r | |
| 32 | **/\r | |
| 33 | BOOLEAN\r | |
| 34 | EFIAPI\r | |
| 35 | QemuFwCfgIsAvailable (\r | |
| 36 | VOID\r | |
| 37 | )\r | |
| 38 | {\r | |
| 39 | return InternalQemuFwCfgIsAvailable ();\r | |
| 40 | }\r | |
| 41 | \r | |
| 42 | \r | |
| 43 | RETURN_STATUS\r | |
| 44 | EFIAPI\r | |
| 45 | QemuFwCfgInitialize (\r | |
| 46 | VOID\r | |
| 47 | )\r | |
| 48 | {\r | |
| 49 | UINT32 Signature;\r | |
| 50 | UINT32 Revision;\r | |
| 51 | \r | |
| 52 | //\r | |
| 53 | // Enable the access routines while probing to see if it is supported.\r | |
| 54 | //\r | |
| 55 | mQemuFwCfgSupported = TRUE;\r | |
| 56 | \r | |
| 57 | QemuFwCfgSelectItem (QemuFwCfgItemSignature);\r | |
| 58 | Signature = QemuFwCfgRead32 ();\r | |
| 59 | DEBUG ((EFI_D_INFO, "FW CFG Signature: 0x%x\n", Signature));\r | |
| 60 | QemuFwCfgSelectItem (QemuFwCfgItemInterfaceVersion);\r | |
| 61 | Revision = QemuFwCfgRead32 ();\r | |
| 62 | DEBUG ((EFI_D_INFO, "FW CFG Revision: 0x%x\n", Revision));\r | |
| 63 | if ((Signature != SIGNATURE_32 ('Q', 'E', 'M', 'U')) ||\r | |
| 64 | (Revision < 1)\r | |
| 65 | ) {\r | |
| 66 | DEBUG ((EFI_D_INFO, "QemuFwCfg interface not supported.\n"));\r | |
| 67 | mQemuFwCfgSupported = FALSE;\r | |
| 68 | return RETURN_SUCCESS;\r | |
| 69 | }\r | |
| 70 | \r | |
| 71 | DEBUG ((EFI_D_INFO, "QemuFwCfg interface is supported.\n"));\r | |
| 72 | return RETURN_SUCCESS;\r | |
| 73 | }\r | |
| 74 | \r | |
| 75 | \r | |
| 76 | /**\r | |
| 77 | Returns a boolean indicating if the firmware configuration interface is\r | |
| 78 | available for library-internal purposes.\r | |
| 79 | \r | |
| 80 | This function never changes fw_cfg state.\r | |
| 81 | \r | |
| 82 | @retval TRUE The interface is available internally.\r | |
| 83 | @retval FALSE The interface is not available internally.\r | |
| 84 | **/\r | |
| 85 | BOOLEAN\r | |
| 86 | EFIAPI\r | |
| 87 | InternalQemuFwCfgIsAvailable (\r | |
| 88 | VOID\r | |
| 89 | )\r | |
| 90 | {\r | |
| 91 | return mQemuFwCfgSupported;\r | |
| 92 | }\r |