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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 | |
20 | #include <Library/QemuFwCfgLib.h>\r | |
21 | #include <Library/UefiBootServicesTableLib.h>\r | |
22 | \r | |
23 | EFI_STATUS\r | |
24 | EFIAPI\r | |
25 | PlatformHasAcpiDt (\r | |
26 | IN EFI_HANDLE ImageHandle,\r | |
27 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
28 | )\r | |
29 | {\r | |
30 | EFI_STATUS Status;\r | |
31 | FIRMWARE_CONFIG_ITEM FwCfgItem;\r | |
32 | UINTN FwCfgSize;\r | |
33 | \r | |
34 | //\r | |
35 | // If we fail to install any of the necessary protocols below, the OS will be\r | |
36 | // unbootable anyway (due to lacking hardware description), so tolerate no\r | |
37 | // errors here.\r | |
38 | //\r | |
39 | if (MAX_UINTN == MAX_UINT64 &&\r | |
40 | !EFI_ERROR (\r | |
41 | QemuFwCfgFindFile (\r | |
42 | "etc/table-loader",\r | |
43 | &FwCfgItem,\r | |
44 | &FwCfgSize\r | |
45 | )\r | |
46 | )) {\r | |
47 | //\r | |
48 | // Only make ACPI available on 64-bit systems, and only if QEMU generates\r | |
49 | // (a subset of) the ACPI tables.\r | |
50 | //\r | |
51 | Status = gBS->InstallProtocolInterface (\r | |
52 | &ImageHandle,\r | |
53 | &gEdkiiPlatformHasAcpiGuid,\r | |
54 | EFI_NATIVE_INTERFACE,\r | |
55 | NULL\r | |
56 | );\r | |
57 | if (EFI_ERROR (Status)) {\r | |
58 | goto Failed;\r | |
59 | }\r | |
60 | \r | |
61 | return Status;\r | |
62 | }\r | |
63 | \r | |
64 | //\r | |
65 | // Expose the Device Tree otherwise.\r | |
66 | //\r | |
67 | Status = gBS->InstallProtocolInterface (\r | |
68 | &ImageHandle,\r | |
69 | &gEdkiiPlatformHasDeviceTreeGuid,\r | |
70 | EFI_NATIVE_INTERFACE,\r | |
71 | NULL\r | |
72 | );\r | |
73 | if (EFI_ERROR (Status)) {\r | |
74 | goto Failed;\r | |
75 | }\r | |
76 | \r | |
77 | return Status;\r | |
78 | \r | |
79 | Failed:\r | |
80 | ASSERT_EFI_ERROR (Status);\r | |
81 | CpuDeadLoop ();\r | |
82 | //\r | |
83 | // Keep compilers happy.\r | |
84 | //\r | |
85 | return Status;\r | |
86 | }\r |