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2558bfe3 LE |
1 | /** @file\r |
2 | Decide whether the firmware should expose an ACPI- and/or a Device Tree-based\r | |
3 | hardware description to the operating system.\r | |
4 | \r | |
5 | Copyright (c) 2017, Red Hat, Inc.\r | |
6 | \r | |
7 | This program and the accompanying materials are licensed and made available\r | |
8 | under the terms and conditions of the BSD License which accompanies this\r | |
9 | distribution. The full text of the license may be found at\r | |
10 | http://opensource.org/licenses/bsd-license.php\r | |
11 | \r | |
12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r | |
13 | WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | **/\r | |
15 | \r | |
16 | #include <Guid/PlatformHasAcpi.h>\r | |
17 | #include <Guid/PlatformHasDeviceTree.h>\r | |
18 | #include <Library/BaseLib.h>\r | |
19 | #include <Library/DebugLib.h>\r | |
7e5f1b67 | 20 | #include <Library/PcdLib.h>\r |
110316a9 | 21 | #include <Library/QemuFwCfgLib.h>\r |
2558bfe3 LE |
22 | #include <Library/UefiBootServicesTableLib.h>\r |
23 | \r | |
24 | EFI_STATUS\r | |
25 | EFIAPI\r | |
26 | PlatformHasAcpiDt (\r | |
27 | IN EFI_HANDLE ImageHandle,\r | |
28 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
29 | )\r | |
30 | {\r | |
110316a9 LE |
31 | EFI_STATUS Status;\r |
32 | FIRMWARE_CONFIG_ITEM FwCfgItem;\r | |
33 | UINTN FwCfgSize;\r | |
2558bfe3 LE |
34 | \r |
35 | //\r | |
36 | // If we fail to install any of the necessary protocols below, the OS will be\r | |
37 | // unbootable anyway (due to lacking hardware description), so tolerate no\r | |
38 | // errors here.\r | |
39 | //\r | |
110316a9 | 40 | if (MAX_UINTN == MAX_UINT64 &&\r |
7e5f1b67 | 41 | !PcdGetBool (PcdForceNoAcpi) &&\r |
110316a9 LE |
42 | !EFI_ERROR (\r |
43 | QemuFwCfgFindFile (\r | |
44 | "etc/table-loader",\r | |
45 | &FwCfgItem,\r | |
46 | &FwCfgSize\r | |
47 | )\r | |
48 | )) {\r | |
49 | //\r | |
50 | // Only make ACPI available on 64-bit systems, and only if QEMU generates\r | |
51 | // (a subset of) the ACPI tables.\r | |
52 | //\r | |
2558bfe3 LE |
53 | Status = gBS->InstallProtocolInterface (\r |
54 | &ImageHandle,\r | |
55 | &gEdkiiPlatformHasAcpiGuid,\r | |
56 | EFI_NATIVE_INTERFACE,\r | |
57 | NULL\r | |
58 | );\r | |
59 | if (EFI_ERROR (Status)) {\r | |
60 | goto Failed;\r | |
61 | }\r | |
110316a9 LE |
62 | \r |
63 | return Status;\r | |
2558bfe3 LE |
64 | }\r |
65 | \r | |
66 | //\r | |
110316a9 | 67 | // Expose the Device Tree otherwise.\r |
2558bfe3 | 68 | //\r |
110316a9 LE |
69 | Status = gBS->InstallProtocolInterface (\r |
70 | &ImageHandle,\r | |
71 | &gEdkiiPlatformHasDeviceTreeGuid,\r | |
72 | EFI_NATIVE_INTERFACE,\r | |
73 | NULL\r | |
74 | );\r | |
75 | if (EFI_ERROR (Status)) {\r | |
76 | goto Failed;\r | |
2558bfe3 LE |
77 | }\r |
78 | \r | |
79 | return Status;\r | |
80 | \r | |
81 | Failed:\r | |
82 | ASSERT_EFI_ERROR (Status);\r | |
83 | CpuDeadLoop ();\r | |
84 | //\r | |
85 | // Keep compilers happy.\r | |
86 | //\r | |
87 | return Status;\r | |
88 | }\r |