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1 | /** @file\r |
2 | MM IO Trap Dispatch Protocol as defined in PI 1.5 Specification\r | |
3 | Volume 4 Management Mode Core Interface.\r | |
4 | \r | |
5 | This protocol provides a parent dispatch service for IO trap MMI sources.\r | |
6 | \r | |
7 | Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>\r | |
8 | This program and the accompanying materials\r | |
9 | are licensed and made available under the terms and conditions of the BSD License\r | |
10 | which accompanies this distribution. The full text of the license may be found at\r | |
11 | http://opensource.org/licenses/bsd-license.php\r | |
12 | \r | |
13 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
14 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
15 | \r | |
16 | @par Revision Reference:\r | |
17 | This protocol is from PI Version 1.5.\r | |
18 | \r | |
19 | **/\r | |
20 | \r | |
21 | #ifndef _MM_IO_TRAP_DISPATCH_H_\r | |
22 | #define _MM_IO_TRAP_DISPATCH_H_\r | |
23 | \r | |
24 | #include <Pi/PiMmCis.h>\r | |
25 | \r | |
26 | #define EFI_MM_IO_TRAP_DISPATCH_PROTOCOL_GUID \\r | |
27 | { \\r | |
28 | 0x58dc368d, 0x7bfa, 0x4e77, {0xab, 0xbc, 0xe, 0x29, 0x41, 0x8d, 0xf9, 0x30 } \\r | |
29 | }\r | |
30 | \r | |
31 | ///\r | |
32 | /// IO Trap valid types\r | |
33 | ///\r | |
34 | typedef enum {\r | |
35 | WriteTrap,\r | |
36 | ReadTrap,\r | |
37 | ReadWriteTrap,\r | |
38 | IoTrapTypeMaximum\r | |
39 | } EFI_MM_IO_TRAP_DISPATCH_TYPE;\r | |
40 | \r | |
41 | ///\r | |
42 | /// IO Trap context structure containing information about the\r | |
43 | /// IO trap event that should invoke the handler\r | |
44 | ///\r | |
45 | typedef struct {\r | |
46 | UINT16 Address;\r | |
47 | UINT16 Length;\r | |
48 | EFI_MM_IO_TRAP_DISPATCH_TYPE Type;\r | |
49 | } EFI_MM_IO_TRAP_REGISTER_CONTEXT;\r | |
50 | \r | |
51 | ///\r | |
52 | /// IO Trap context structure containing information about the IO trap that occurred\r | |
53 | ///\r | |
54 | typedef struct {\r | |
55 | UINT32 WriteData;\r | |
56 | } EFI_MM_IO_TRAP_CONTEXT;\r | |
57 | \r | |
58 | typedef struct _EFI_MM_IO_TRAP_DISPATCH_PROTOCOL EFI_MM_IO_TRAP_DISPATCH_PROTOCOL;\r | |
59 | \r | |
60 | /**\r | |
61 | Register an IO trap MMI child handler for a specified MMI.\r | |
62 | \r | |
63 | This service registers a function (DispatchFunction) which will be called when an MMI is\r | |
64 | generated because of an access to an I/O port specified by RegisterContext. On return,\r | |
65 | DispatchHandle contains a unique handle which may be used later to unregister the function\r | |
66 | using UnRegister(). If the base of the I/O range specified is zero, then an I/O range with the\r | |
67 | specified length and characteristics will be allocated and the Address field in RegisterContext\r | |
68 | updated. If no range could be allocated, then EFI_OUT_OF_RESOURCES will be returned.\r | |
69 | \r | |
70 | The service will not perform GCD allocation if the base address is non-zero or\r | |
71 | EFI_MM_READY_TO_LOCK has been installed. In this case, the caller is responsible for the\r | |
72 | existence and allocation of the specific IO range.\r | |
73 | An error may be returned if some or all of the requested resources conflict with an existing IO trap\r | |
74 | child handler.\r | |
75 | \r | |
76 | It is not required that implementations will allow multiple children for a single IO trap MMI source.\r | |
77 | Some implementations may support multiple children.\r | |
78 | The DispatchFunction will be called with Context updated to contain information\r | |
79 | concerning the I/O action that actually happened and is passed in RegisterContext, with\r | |
80 | CommBuffer pointing to the data actually written and CommBufferSize pointing to the size of\r | |
81 | the data in CommBuffer.\r | |
82 | \r | |
83 | @param[in] This Pointer to the EFI_MM_IO_TRAP_DISPATCH_PROTOCOL instance.\r | |
84 | @param[in] DispatchFunction Function to register for handler when I/O trap location is accessed.\r | |
85 | @param[in] RegisterContext Pointer to the dispatch function's context. The caller fills this\r | |
86 | context in before calling the register function to indicate to the register\r | |
87 | function the IO trap MMI source for which the dispatch function should be invoked.\r | |
88 | @param[out] DispatchHandle Handle of the dispatch function, for when interfacing with the parent MM driver.\r | |
89 | \r | |
90 | @retval EFI_SUCCESS The dispatch function has been successfully registered.\r | |
91 | @retval EFI_DEVICE_ERROR The driver was unable to complete due to hardware error.\r | |
92 | @retval EFI_OUT_OF_RESOURCES Insufficient resources are available to fulfill the IO trap range request.\r | |
93 | @retval EFI_INVALID_PARAMETER RegisterContext is invalid. The input value is not within a valid range.\r | |
94 | **/\r | |
95 | typedef\r | |
96 | EFI_STATUS\r | |
97 | (EFIAPI *EFI_MM_IO_TRAP_DISPATCH_REGISTER)(\r | |
98 | IN CONST EFI_MM_IO_TRAP_DISPATCH_PROTOCOL *This,\r | |
99 | IN EFI_MM_HANDLER_ENTRY_POINT DispatchFunction,\r | |
100 | IN OUT EFI_MM_IO_TRAP_REGISTER_CONTEXT *RegisterContext,\r | |
101 | OUT EFI_HANDLE *DispatchHandle\r | |
102 | );\r | |
103 | \r | |
104 | /**\r | |
105 | Unregister a child MMI source dispatch function with a parent MM driver.\r | |
106 | \r | |
107 | This service removes a previously installed child dispatch handler. This does not guarantee that the\r | |
108 | system resources will be freed from the GCD.\r | |
109 | \r | |
110 | @param[in] This Pointer to the EFI_MM_IO_TRAP_DISPATCH_PROTOCOL instance.\r | |
111 | @param[in] DispatchHandle Handle of the child service to remove.\r | |
112 | \r | |
113 | @retval EFI_SUCCESS The dispatch function has been successfully unregistered.\r | |
114 | @retval EFI_INVALID_PARAMETER The DispatchHandle was not valid.\r | |
115 | **/\r | |
116 | typedef\r | |
117 | EFI_STATUS\r | |
118 | (EFIAPI *EFI_MM_IO_TRAP_DISPATCH_UNREGISTER)(\r | |
119 | IN CONST EFI_MM_IO_TRAP_DISPATCH_PROTOCOL *This,\r | |
120 | IN EFI_HANDLE DispatchHandle\r | |
121 | );\r | |
122 | \r | |
123 | ///\r | |
124 | /// Interface structure for the MM IO Trap Dispatch Protocol.\r | |
125 | ///\r | |
126 | /// This protocol provides a parent dispatch service for IO trap MMI sources.\r | |
127 | ///\r | |
128 | struct _EFI_MM_IO_TRAP_DISPATCH_PROTOCOL {\r | |
129 | EFI_MM_IO_TRAP_DISPATCH_REGISTER Register;\r | |
130 | EFI_MM_IO_TRAP_DISPATCH_UNREGISTER UnRegister;\r | |
131 | };\r | |
132 | \r | |
133 | extern EFI_GUID gEfiMmIoTrapDispatchProtocolGuid;\r | |
134 | \r | |
135 | #endif\r | |
136 | \r |