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1 | /** @file\r |
2 | Functions to make Xen hypercalls.\r | |
3 | \r | |
4 | Copyright (C) 2014, Citrix Ltd.\r | |
5 | \r | |
6 | This program and the accompanying materials\r | |
7 | are licensed and made available under the terms and conditions of the BSD License\r | |
8 | which accompanies this distribution. The full text of the license may be found at\r | |
9 | http://opensource.org/licenses/bsd-license.php\r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | \r | |
14 | **/\r | |
15 | \r | |
16 | #include <PiDxe.h>\r | |
17 | #include <Library/HobLib.h>\r | |
18 | #include <Guid/XenInfo.h>\r | |
19 | \r | |
20 | #include "XenBusDxe.h"\r | |
21 | #include "XenHypercall.h"\r | |
22 | \r | |
23 | #include <IndustryStandard/Xen/hvm/params.h>\r | |
24 | #include <IndustryStandard/Xen/memory.h>\r | |
25 | \r | |
26 | EFI_STATUS\r | |
27 | XenHyperpageInit (\r | |
28 | IN OUT XENBUS_DEVICE *Dev\r | |
29 | )\r | |
30 | {\r | |
31 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
32 | EFI_XEN_INFO *XenInfo;\r | |
33 | \r | |
34 | GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);\r | |
35 | if (GuidHob == NULL) {\r | |
36 | return EFI_NOT_FOUND;\r | |
37 | }\r | |
38 | XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);\r | |
39 | Dev->Hyperpage = XenInfo->HyperPages;\r | |
40 | return EFI_SUCCESS;\r | |
41 | }\r | |
42 | \r | |
43 | UINT64\r | |
44 | XenHypercallHvmGetParam (\r | |
45 | IN XENBUS_DEVICE *Dev,\r | |
cec6ad0a | 46 | IN UINT32 Index\r |
abcbbb14 AP |
47 | )\r |
48 | {\r | |
49 | xen_hvm_param_t Parameter;\r | |
50 | INTN Error;\r | |
51 | \r | |
52 | ASSERT (Dev->Hyperpage != NULL);\r | |
53 | \r | |
54 | Parameter.domid = DOMID_SELF;\r | |
55 | Parameter.index = Index;\r | |
017a4866 | 56 | Error = XenHypercall2 ((UINT8*)Dev->Hyperpage + __HYPERVISOR_hvm_op * 32,\r |
abcbbb14 AP |
57 | HVMOP_get_param, (INTN) &Parameter);\r |
58 | if (Error != 0) {\r | |
59 | DEBUG ((EFI_D_ERROR,\r | |
60 | "XenHypercall: Error %d trying to get HVM parameter %d\n",\r | |
61 | Error, Index));\r | |
62 | return 0;\r | |
63 | }\r | |
64 | return Parameter.value;\r | |
65 | }\r | |
66 | \r | |
67 | INTN\r | |
68 | XenHypercallMemoryOp (\r | |
69 | IN XENBUS_DEVICE *Dev,\r | |
70 | IN UINTN Operation,\r | |
71 | IN OUT VOID *Arguments\r | |
72 | )\r | |
73 | {\r | |
74 | ASSERT (Dev->Hyperpage != NULL);\r | |
017a4866 | 75 | return XenHypercall2 ((UINT8*)Dev->Hyperpage + __HYPERVISOR_memory_op * 32,\r |
abcbbb14 AP |
76 | Operation, (INTN) Arguments);\r |
77 | }\r | |
78 | \r | |
79 | INTN\r | |
80 | XenHypercallEventChannelOp (\r | |
81 | IN XENBUS_DEVICE *Dev,\r | |
82 | IN INTN Operation,\r | |
83 | IN OUT VOID *Arguments\r | |
84 | )\r | |
85 | {\r | |
86 | ASSERT (Dev->Hyperpage != NULL);\r | |
017a4866 | 87 | return XenHypercall2 ((UINT8*)Dev->Hyperpage + __HYPERVISOR_event_channel_op * 32,\r |
abcbbb14 AP |
88 | Operation, (INTN) Arguments);\r |
89 | }\r | |
90 | \r | |
91 | EFI_STATUS\r | |
92 | XenGetSharedInfoPage (\r | |
93 | IN OUT XENBUS_DEVICE *Dev\r | |
94 | )\r | |
95 | {\r | |
96 | xen_add_to_physmap_t Parameter;\r | |
97 | \r | |
98 | ASSERT (Dev->SharedInfo == NULL);\r | |
99 | \r | |
100 | Parameter.domid = DOMID_SELF;\r | |
101 | Parameter.space = XENMAPSPACE_shared_info;\r | |
102 | Parameter.idx = 0;\r | |
103 | \r | |
104 | //\r | |
105 | // using reserved page because the page is not released when Linux is\r | |
106 | // starting because of the add_to_physmap. QEMU might try to access the\r | |
107 | // page, and fail because it have no right to do so (segv).\r | |
108 | //\r | |
109 | Dev->SharedInfo = AllocateReservedPages (1);\r | |
110 | Parameter.gpfn = (UINTN) Dev->SharedInfo >> EFI_PAGE_SHIFT;\r | |
111 | if (XenHypercallMemoryOp (Dev, XENMEM_add_to_physmap, &Parameter) != 0) {\r | |
112 | FreePages (Dev->SharedInfo, 1);\r | |
113 | Dev->SharedInfo = NULL;\r | |
114 | return EFI_LOAD_ERROR;\r | |
115 | }\r | |
116 | \r | |
117 | return EFI_SUCCESS;\r | |
118 | }\r |