Ronak Kanabar | 1ae366f | 2023-06-07 01:21:56 +0530 | [diff] [blame^] | 1 | /** @file |
| 2 | MM IO Trap Dispatch Protocol as defined in PI 1.5 Specification |
| 3 | Volume 4 Management Mode Core Interface. |
| 4 | |
| 5 | This protocol provides a parent dispatch service for IO trap MMI sources. |
| 6 | |
| 7 | Copyright (c) 2017, Intel Corporation. All rights reserved.<BR> |
| 8 | SPDX-License-Identifier: BSD-2-Clause-Patent |
| 9 | |
| 10 | @par Revision Reference: |
| 11 | This protocol is from PI Version 1.5. |
| 12 | |
| 13 | **/ |
| 14 | |
| 15 | #ifndef _MM_IO_TRAP_DISPATCH_H_ |
| 16 | #define _MM_IO_TRAP_DISPATCH_H_ |
| 17 | |
| 18 | #include <Pi/PiMmCis.h> |
| 19 | |
| 20 | #define EFI_MM_IO_TRAP_DISPATCH_PROTOCOL_GUID \ |
| 21 | { \ |
| 22 | 0x58dc368d, 0x7bfa, 0x4e77, {0xab, 0xbc, 0xe, 0x29, 0x41, 0x8d, 0xf9, 0x30 } \ |
| 23 | } |
| 24 | |
| 25 | /// |
| 26 | /// IO Trap valid types |
| 27 | /// |
| 28 | typedef enum { |
| 29 | WriteTrap, |
| 30 | ReadTrap, |
| 31 | ReadWriteTrap, |
| 32 | IoTrapTypeMaximum |
| 33 | } EFI_MM_IO_TRAP_DISPATCH_TYPE; |
| 34 | |
| 35 | /// |
| 36 | /// IO Trap context structure containing information about the |
| 37 | /// IO trap event that should invoke the handler |
| 38 | /// |
| 39 | typedef struct { |
| 40 | UINT16 Address; |
| 41 | UINT16 Length; |
| 42 | EFI_MM_IO_TRAP_DISPATCH_TYPE Type; |
| 43 | } EFI_MM_IO_TRAP_REGISTER_CONTEXT; |
| 44 | |
| 45 | /// |
| 46 | /// IO Trap context structure containing information about the IO trap that occurred |
| 47 | /// |
| 48 | typedef struct { |
| 49 | UINT32 WriteData; |
| 50 | } EFI_MM_IO_TRAP_CONTEXT; |
| 51 | |
| 52 | typedef struct _EFI_MM_IO_TRAP_DISPATCH_PROTOCOL EFI_MM_IO_TRAP_DISPATCH_PROTOCOL; |
| 53 | |
| 54 | /** |
| 55 | Register an IO trap MMI child handler for a specified MMI. |
| 56 | |
| 57 | This service registers a function (DispatchFunction) which will be called when an MMI is |
| 58 | generated because of an access to an I/O port specified by RegisterContext. On return, |
| 59 | DispatchHandle contains a unique handle which may be used later to unregister the function |
| 60 | using UnRegister(). If the base of the I/O range specified is zero, then an I/O range with the |
| 61 | specified length and characteristics will be allocated and the Address field in RegisterContext |
| 62 | updated. If no range could be allocated, then EFI_OUT_OF_RESOURCES will be returned. |
| 63 | |
| 64 | The service will not perform GCD allocation if the base address is non-zero or |
| 65 | EFI_MM_READY_TO_LOCK has been installed. In this case, the caller is responsible for the |
| 66 | existence and allocation of the specific IO range. |
| 67 | An error may be returned if some or all of the requested resources conflict with an existing IO trap |
| 68 | child handler. |
| 69 | |
| 70 | It is not required that implementations will allow multiple children for a single IO trap MMI source. |
| 71 | Some implementations may support multiple children. |
| 72 | The DispatchFunction will be called with Context updated to contain information |
| 73 | concerning the I/O action that actually happened and is passed in RegisterContext, with |
| 74 | CommBuffer pointing to the data actually written and CommBufferSize pointing to the size of |
| 75 | the data in CommBuffer. |
| 76 | |
| 77 | @param[in] This Pointer to the EFI_MM_IO_TRAP_DISPATCH_PROTOCOL instance. |
| 78 | @param[in] DispatchFunction Function to register for handler when I/O trap location is accessed. |
| 79 | @param[in] RegisterContext Pointer to the dispatch function's context. The caller fills this |
| 80 | context in before calling the register function to indicate to the register |
| 81 | function the IO trap MMI source for which the dispatch function should be invoked. |
| 82 | @param[out] DispatchHandle Handle of the dispatch function, for when interfacing with the parent MM driver. |
| 83 | |
| 84 | @retval EFI_SUCCESS The dispatch function has been successfully registered. |
| 85 | @retval EFI_DEVICE_ERROR The driver was unable to complete due to hardware error. |
| 86 | @retval EFI_OUT_OF_RESOURCES Insufficient resources are available to fulfill the IO trap range request. |
| 87 | @retval EFI_INVALID_PARAMETER RegisterContext is invalid. The input value is not within a valid range. |
| 88 | **/ |
| 89 | typedef |
| 90 | EFI_STATUS |
| 91 | (EFIAPI *EFI_MM_IO_TRAP_DISPATCH_REGISTER)( |
| 92 | IN CONST EFI_MM_IO_TRAP_DISPATCH_PROTOCOL *This, |
| 93 | IN EFI_MM_HANDLER_ENTRY_POINT DispatchFunction, |
| 94 | IN OUT EFI_MM_IO_TRAP_REGISTER_CONTEXT *RegisterContext, |
| 95 | OUT EFI_HANDLE *DispatchHandle |
| 96 | ); |
| 97 | |
| 98 | /** |
| 99 | Unregister a child MMI source dispatch function with a parent MM driver. |
| 100 | |
| 101 | This service removes a previously installed child dispatch handler. This does not guarantee that the |
| 102 | system resources will be freed from the GCD. |
| 103 | |
| 104 | @param[in] This Pointer to the EFI_MM_IO_TRAP_DISPATCH_PROTOCOL instance. |
| 105 | @param[in] DispatchHandle Handle of the child service to remove. |
| 106 | |
| 107 | @retval EFI_SUCCESS The dispatch function has been successfully unregistered. |
| 108 | @retval EFI_INVALID_PARAMETER The DispatchHandle was not valid. |
| 109 | **/ |
| 110 | typedef |
| 111 | EFI_STATUS |
| 112 | (EFIAPI *EFI_MM_IO_TRAP_DISPATCH_UNREGISTER)( |
| 113 | IN CONST EFI_MM_IO_TRAP_DISPATCH_PROTOCOL *This, |
| 114 | IN EFI_HANDLE DispatchHandle |
| 115 | ); |
| 116 | |
| 117 | /// |
| 118 | /// Interface structure for the MM IO Trap Dispatch Protocol. |
| 119 | /// |
| 120 | /// This protocol provides a parent dispatch service for IO trap MMI sources. |
| 121 | /// |
| 122 | struct _EFI_MM_IO_TRAP_DISPATCH_PROTOCOL { |
| 123 | EFI_MM_IO_TRAP_DISPATCH_REGISTER Register; |
| 124 | EFI_MM_IO_TRAP_DISPATCH_UNREGISTER UnRegister; |
| 125 | }; |
| 126 | |
| 127 | extern EFI_GUID gEfiMmIoTrapDispatchProtocolGuid; |
| 128 | |
| 129 | #endif |