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131 lines
5.2 KiB
C
131 lines
5.2 KiB
C
/** @file
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MM IO Trap Dispatch Protocol as defined in PI 1.5 Specification
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Volume 4 Management Mode Core Interface.
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This protocol provides a parent dispatch service for IO trap MMI sources.
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Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference:
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This protocol is from PI Version 1.5.
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**/
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#ifndef _MM_IO_TRAP_DISPATCH_H_
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#define _MM_IO_TRAP_DISPATCH_H_
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#include <Pi/PiMmCis.h>
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#define EFI_MM_IO_TRAP_DISPATCH_PROTOCOL_GUID \
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{ \
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0x58dc368d, 0x7bfa, 0x4e77, {0xab, 0xbc, 0xe, 0x29, 0x41, 0x8d, 0xf9, 0x30 } \
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}
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///
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/// IO Trap valid types
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///
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typedef enum {
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WriteTrap,
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ReadTrap,
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ReadWriteTrap,
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IoTrapTypeMaximum
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} EFI_MM_IO_TRAP_DISPATCH_TYPE;
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///
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/// IO Trap context structure containing information about the
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/// IO trap event that should invoke the handler
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///
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typedef struct {
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UINT16 Address;
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UINT16 Length;
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EFI_MM_IO_TRAP_DISPATCH_TYPE Type;
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} EFI_MM_IO_TRAP_REGISTER_CONTEXT;
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///
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/// IO Trap context structure containing information about the IO trap that occurred
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///
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typedef struct {
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UINT32 WriteData;
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} EFI_MM_IO_TRAP_CONTEXT;
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typedef struct _EFI_MM_IO_TRAP_DISPATCH_PROTOCOL EFI_MM_IO_TRAP_DISPATCH_PROTOCOL;
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/**
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Register an IO trap MMI child handler for a specified MMI.
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This service registers a function (DispatchFunction) which will be called when an MMI is
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generated because of an access to an I/O port specified by RegisterContext. On return,
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DispatchHandle contains a unique handle which may be used later to unregister the function
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using UnRegister(). If the base of the I/O range specified is zero, then an I/O range with the
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specified length and characteristics will be allocated and the Address field in RegisterContext
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updated. If no range could be allocated, then EFI_OUT_OF_RESOURCES will be returned.
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The service will not perform GCD allocation if the base address is non-zero or
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EFI_MM_READY_TO_LOCK has been installed. In this case, the caller is responsible for the
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existence and allocation of the specific IO range.
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An error may be returned if some or all of the requested resources conflict with an existing IO trap
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child handler.
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It is not required that implementations will allow multiple children for a single IO trap MMI source.
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Some implementations may support multiple children.
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The DispatchFunction will be called with Context updated to contain information
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concerning the I/O action that actually happened and is passed in RegisterContext, with
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CommBuffer pointing to the data actually written and CommBufferSize pointing to the size of
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the data in CommBuffer.
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@param[in] This Pointer to the EFI_MM_IO_TRAP_DISPATCH_PROTOCOL instance.
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@param[in] DispatchFunction Function to register for handler when I/O trap location is accessed.
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@param[in] RegisterContext Pointer to the dispatch function's context. The caller fills this
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context in before calling the register function to indicate to the register
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function the IO trap MMI source for which the dispatch function should be invoked.
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@param[out] DispatchHandle Handle of the dispatch function, for when interfacing with the parent MM driver.
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@retval EFI_SUCCESS The dispatch function has been successfully registered.
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@retval EFI_DEVICE_ERROR The driver was unable to complete due to hardware error.
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@retval EFI_OUT_OF_RESOURCES Insufficient resources are available to fulfill the IO trap range request.
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@retval EFI_INVALID_PARAMETER RegisterContext is invalid. The input value is not within a valid range.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_MM_IO_TRAP_DISPATCH_REGISTER)(
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IN CONST EFI_MM_IO_TRAP_DISPATCH_PROTOCOL *This,
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IN EFI_MM_HANDLER_ENTRY_POINT DispatchFunction,
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IN OUT EFI_MM_IO_TRAP_REGISTER_CONTEXT *RegisterContext,
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OUT EFI_HANDLE *DispatchHandle
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);
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/**
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Unregister a child MMI source dispatch function with a parent MM driver.
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This service removes a previously installed child dispatch handler. This does not guarantee that the
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system resources will be freed from the GCD.
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@param[in] This Pointer to the EFI_MM_IO_TRAP_DISPATCH_PROTOCOL instance.
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@param[in] DispatchHandle Handle of the child service to remove.
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@retval EFI_SUCCESS The dispatch function has been successfully unregistered.
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@retval EFI_INVALID_PARAMETER The DispatchHandle was not valid.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_MM_IO_TRAP_DISPATCH_UNREGISTER)(
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IN CONST EFI_MM_IO_TRAP_DISPATCH_PROTOCOL *This,
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IN EFI_HANDLE DispatchHandle
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);
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///
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/// Interface structure for the MM IO Trap Dispatch Protocol.
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///
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/// This protocol provides a parent dispatch service for IO trap MMI sources.
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///
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struct _EFI_MM_IO_TRAP_DISPATCH_PROTOCOL {
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EFI_MM_IO_TRAP_DISPATCH_REGISTER Register;
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EFI_MM_IO_TRAP_DISPATCH_UNREGISTER UnRegister;
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};
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extern EFI_GUID gEfiMmIoTrapDispatchProtocolGuid;
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#endif
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