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Diffstat (limited to 'MdePkg/Include/Protocol/MmIoTrapDispatch.h')
| -rw-r--r-- | MdePkg/Include/Protocol/MmIoTrapDispatch.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/MdePkg/Include/Protocol/MmIoTrapDispatch.h b/MdePkg/Include/Protocol/MmIoTrapDispatch.h new file mode 100644 index 000000000000..4434645035e3 --- /dev/null +++ b/MdePkg/Include/Protocol/MmIoTrapDispatch.h @@ -0,0 +1,130 @@ +/** @file + MM IO Trap Dispatch Protocol as defined in PI 1.5 Specification + Volume 4 Management Mode Core Interface. + + This protocol provides a parent dispatch service for IO trap MMI sources. + + Copyright (c) 2017, Intel Corporation. All rights reserved.<BR> + SPDX-License-Identifier: BSD-2-Clause-Patent + + @par Revision Reference: + This protocol is from PI Version 1.5. + +**/ + +#ifndef _MM_IO_TRAP_DISPATCH_H_ +#define _MM_IO_TRAP_DISPATCH_H_ + +#include <Pi/PiMmCis.h> + +#define EFI_MM_IO_TRAP_DISPATCH_PROTOCOL_GUID \ + { \ + 0x58dc368d, 0x7bfa, 0x4e77, {0xab, 0xbc, 0xe, 0x29, 0x41, 0x8d, 0xf9, 0x30 } \ + } + +/// +/// IO Trap valid types +/// +typedef enum { + WriteTrap, + ReadTrap, + ReadWriteTrap, + IoTrapTypeMaximum +} EFI_MM_IO_TRAP_DISPATCH_TYPE; + +/// +/// IO Trap context structure containing information about the +/// IO trap event that should invoke the handler +/// +typedef struct { + UINT16 Address; + UINT16 Length; + EFI_MM_IO_TRAP_DISPATCH_TYPE Type; +} EFI_MM_IO_TRAP_REGISTER_CONTEXT; + +/// +/// IO Trap context structure containing information about the IO trap that occurred +/// +typedef struct { + UINT32 WriteData; +} EFI_MM_IO_TRAP_CONTEXT; + +typedef struct _EFI_MM_IO_TRAP_DISPATCH_PROTOCOL EFI_MM_IO_TRAP_DISPATCH_PROTOCOL; + +/** + Register an IO trap MMI child handler for a specified MMI. + + This service registers a function (DispatchFunction) which will be called when an MMI is + generated because of an access to an I/O port specified by RegisterContext. On return, + DispatchHandle contains a unique handle which may be used later to unregister the function + using UnRegister(). If the base of the I/O range specified is zero, then an I/O range with the + specified length and characteristics will be allocated and the Address field in RegisterContext + updated. If no range could be allocated, then EFI_OUT_OF_RESOURCES will be returned. + + The service will not perform GCD allocation if the base address is non-zero or + EFI_MM_READY_TO_LOCK has been installed. In this case, the caller is responsible for the + existence and allocation of the specific IO range. + An error may be returned if some or all of the requested resources conflict with an existing IO trap + child handler. + + It is not required that implementations will allow multiple children for a single IO trap MMI source. + Some implementations may support multiple children. + The DispatchFunction will be called with Context updated to contain information + concerning the I/O action that actually happened and is passed in RegisterContext, with + CommBuffer pointing to the data actually written and CommBufferSize pointing to the size of + the data in CommBuffer. + + @param[in] This Pointer to the EFI_MM_IO_TRAP_DISPATCH_PROTOCOL instance. + @param[in] DispatchFunction Function to register for handler when I/O trap location is accessed. + @param[in] RegisterContext Pointer to the dispatch function's context. The caller fills this + context in before calling the register function to indicate to the register + function the IO trap MMI source for which the dispatch function should be invoked. + @param[out] DispatchHandle Handle of the dispatch function, for when interfacing with the parent MM driver. + + @retval EFI_SUCCESS The dispatch function has been successfully registered. + @retval EFI_DEVICE_ERROR The driver was unable to complete due to hardware error. + @retval EFI_OUT_OF_RESOURCES Insufficient resources are available to fulfill the IO trap range request. + @retval EFI_INVALID_PARAMETER RegisterContext is invalid. The input value is not within a valid range. +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_MM_IO_TRAP_DISPATCH_REGISTER)( + IN CONST EFI_MM_IO_TRAP_DISPATCH_PROTOCOL *This, + IN EFI_MM_HANDLER_ENTRY_POINT DispatchFunction, + IN OUT EFI_MM_IO_TRAP_REGISTER_CONTEXT *RegisterContext, + OUT EFI_HANDLE *DispatchHandle + ); + +/** + Unregister a child MMI source dispatch function with a parent MM driver. + + This service removes a previously installed child dispatch handler. This does not guarantee that the + system resources will be freed from the GCD. + + @param[in] This Pointer to the EFI_MM_IO_TRAP_DISPATCH_PROTOCOL instance. + @param[in] DispatchHandle Handle of the child service to remove. + + @retval EFI_SUCCESS The dispatch function has been successfully unregistered. + @retval EFI_INVALID_PARAMETER The DispatchHandle was not valid. +**/ +typedef +EFI_STATUS +(EFIAPI *EFI_MM_IO_TRAP_DISPATCH_UNREGISTER)( + IN CONST EFI_MM_IO_TRAP_DISPATCH_PROTOCOL *This, + IN EFI_HANDLE DispatchHandle + ); + +/// +/// Interface structure for the MM IO Trap Dispatch Protocol. +/// +/// This protocol provides a parent dispatch service for IO trap MMI sources. +/// +struct _EFI_MM_IO_TRAP_DISPATCH_PROTOCOL { + EFI_MM_IO_TRAP_DISPATCH_REGISTER Register; + EFI_MM_IO_TRAP_DISPATCH_UNREGISTER UnRegister; +}; + +extern EFI_GUID gEfiMmIoTrapDispatchProtocolGuid; + +#endif + |