]>
Commit | Line | Data |
---|---|---|
c9eb56e5 | 1 | /** @file\r |
61ac4fc7 | 2 | Detection code for hypervisor debug port.\r |
c09d9571 | 3 | Non-SEC instance, caches the result of detection.\r |
c9eb56e5 PB |
4 | \r |
5 | Copyright (c) 2017, Red Hat, Inc.<BR>\r | |
b26f0cf9 | 6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r |
c9eb56e5 PB |
7 | \r |
8 | **/\r | |
9 | \r | |
10 | #include <Base.h>\r | |
c09d9571 PB |
11 | #include "DebugLibDetect.h"\r |
12 | \r | |
91a5b136 LE |
13 | //\r |
14 | // Set to TRUE if the debug I/O port has been checked\r | |
15 | //\r | |
16 | STATIC BOOLEAN mDebugIoPortChecked = FALSE;\r | |
17 | \r | |
c09d9571 PB |
18 | //\r |
19 | // Set to TRUE if the debug I/O port is enabled\r | |
20 | //\r | |
21 | STATIC BOOLEAN mDebugIoPortFound = FALSE;\r | |
c9eb56e5 PB |
22 | \r |
23 | /**\r | |
91a5b136 LE |
24 | This constructor function must not do anything.\r |
25 | \r | |
26 | Some modules consuming this library instance, such as the DXE Core, invoke\r | |
27 | the DEBUG() macro before they explicitly call\r | |
28 | ProcessLibraryConstructorList(). Therefore the auto-generated call from\r | |
29 | ProcessLibraryConstructorList() to this constructor function may be preceded\r | |
30 | by some calls to PlatformDebugLibIoPortFound() below. Hence\r | |
31 | PlatformDebugLibIoPortFound() must not rely on anything this constructor\r | |
32 | could set up.\r | |
c9eb56e5 PB |
33 | \r |
34 | @retval RETURN_SUCCESS The constructor always returns RETURN_SUCCESS.\r | |
35 | \r | |
36 | **/\r | |
37 | RETURN_STATUS\r | |
38 | EFIAPI\r | |
39 | PlatformDebugLibIoPortConstructor (\r | |
40 | VOID\r | |
41 | )\r | |
42 | {\r | |
43 | return RETURN_SUCCESS;\r | |
44 | }\r | |
c09d9571 PB |
45 | \r |
46 | /**\r | |
91a5b136 LE |
47 | At the first call, check if the debug I/O port device is present, and cache\r |
48 | the result for later use. At subsequent calls, return the cached result.\r | |
c09d9571 PB |
49 | \r |
50 | @retval TRUE if the debug I/O port device was detected.\r | |
51 | @retval FALSE otherwise\r | |
52 | \r | |
53 | **/\r | |
54 | BOOLEAN\r | |
55 | EFIAPI\r | |
56 | PlatformDebugLibIoPortFound (\r | |
57 | VOID\r | |
58 | )\r | |
59 | {\r | |
91a5b136 LE |
60 | if (!mDebugIoPortChecked) {\r |
61 | mDebugIoPortFound = PlatformDebugLibIoPortDetect ();\r | |
62 | mDebugIoPortChecked = TRUE;\r | |
63 | }\r | |
c09d9571 PB |
64 | return mDebugIoPortFound;\r |
65 | }\r |