projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| cd8ff8fd AB |
1 | /** @file\r |
| 2 | Xen Hypercall Library implementation for Intel architecture\r | |
| 3 | \r | |
| 4 | Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>\r | |
| 5 | This program and the accompanying materials are licensed and made available under\r | |
| 6 | the terms and conditions of the BSD License that accompanies this distribution.\r | |
| 7 | The full text of the license may be found at\r | |
| 8 | http://opensource.org/licenses/bsd-license.php.\r | |
| 9 | \r | |
| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 12 | \r | |
| 13 | **/\r | |
| 14 | \r | |
| 15 | #include <PiDxe.h>\r | |
| 16 | #include <Library/HobLib.h>\r | |
| 17 | #include <Library/DebugLib.h>\r | |
| 18 | #include <Guid/XenInfo.h>\r | |
| 19 | \r | |
| 20 | STATIC VOID *HyperPage;\r | |
| 21 | \r | |
| 22 | //\r | |
| 23 | // Interface exposed by the ASM implementation of the core hypercall\r | |
| 24 | //\r | |
| 25 | INTN\r | |
| 26 | EFIAPI\r | |
| 27 | __XenHypercall2 (\r | |
| 28 | IN VOID *HypercallAddr,\r | |
| 29 | IN OUT INTN Arg1,\r | |
| 30 | IN OUT INTN Arg2\r | |
| 31 | );\r | |
| 32 | \r | |
| 33 | /**\r | |
| 34 | Library constructor: retrieves the Hyperpage address\r | |
| 35 | from the gEfiXenInfoGuid HOB\r | |
| 36 | **/\r | |
| 37 | \r | |
| 38 | RETURN_STATUS\r | |
| 39 | EFIAPI\r | |
| df040c00 | 40 | XenHypercallLibInit (\r |
| cd8ff8fd AB |
41 | VOID\r |
| 42 | )\r | |
| 43 | {\r | |
| 44 | EFI_HOB_GUID_TYPE *GuidHob;\r | |
| 45 | EFI_XEN_INFO *XenInfo;\r | |
| 46 | \r | |
| 47 | GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);\r | |
| 48 | if (GuidHob == NULL) {\r | |
| 49 | return RETURN_NOT_FOUND;\r | |
| 50 | }\r | |
| 51 | XenInfo = (EFI_XEN_INFO *) GET_GUID_HOB_DATA (GuidHob);\r | |
| 52 | HyperPage = XenInfo->HyperPages;\r | |
| 53 | return RETURN_SUCCESS;\r | |
| 54 | }\r | |
| 55 | \r | |
| 56 | /**\r | |
| 57 | This function will put the two arguments in the right place (registers) and\r | |
| 58 | invoke the hypercall identified by HypercallID.\r | |
| 59 | \r | |
| 60 | @param HypercallID The symbolic ID of the hypercall to be invoked\r | |
| 61 | @param Arg1 First argument.\r | |
| 62 | @param Arg2 Second argument.\r | |
| 63 | \r | |
| 64 | @return Return 0 if success otherwise it return an errno.\r | |
| 65 | **/\r | |
| 66 | INTN\r | |
| 67 | EFIAPI\r | |
| 68 | XenHypercall2 (\r | |
| 69 | IN UINTN HypercallID,\r | |
| 70 | IN OUT INTN Arg1,\r | |
| 71 | IN OUT INTN Arg2\r | |
| 72 | )\r | |
| 73 | {\r | |
| 74 | ASSERT (HyperPage != NULL);\r | |
| 75 | \r | |
| 76 | return __XenHypercall2 ((UINT8*)HyperPage + HypercallID * 32, Arg1, Arg2);\r | |
| 77 | }\r |