/*++

Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials                          
are licensed and made available under the terms and conditions of the BSD License         
which accompanies this distribution.  The full text of the license may be found at        
http://opensource.org/licenses/bsd-license.php                                            
                                                                                          
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             

Module Name:  
  
    Ebc.h
  
Abstract:

  Describes the protocol interface to the EBC interpreter.
  
--*/

#ifndef _EBC_H_
#define _EBC_H_

#define EFI_EBC_INTERPRETER_PROTOCOL_GUID \
  { \
    0x13AC6DD1, 0x73D0, 0x11D4, {0xB0, 0x6B, 0x00, 0xAA, 0x00, 0xBD, 0x6D, 0xE7} \
  }

//
// Define for forward reference.
//
EFI_FORWARD_DECLARATION (EFI_EBC_PROTOCOL);

/*++

Routine Description:
  
  Create a thunk for an image entry point. In short, given the physical address
  of the entry point for a loaded image, create a thunk that does some 
  fixup of arguments (and perform any other necessary overhead) and then
  calls the original entry point. The caller can then use the returned pointer
  to the created thunk as the new entry point to image.

Arguments:

  This          - protocol instance pointer
  ImageHandle   - handle to the image. The EBC interpreter may use this to keep
                  track of any resource allocations performed in loading and
                  executing the image.
  EbcEntryPoint - the entry point for the image (as defined in the file header)
  Thunk         - pointer to thunk pointer where the address of the created
                  thunk is returned.

Returns:

  Standard EFI_STATUS

--*/
typedef
EFI_STATUS
(EFIAPI *EFI_EBC_CREATE_THUNK) (
  IN EFI_EBC_PROTOCOL           * This,
  IN EFI_HANDLE                 ImageHandle,
  IN VOID                       *EbcEntryPoint,
  OUT VOID                      **Thunk
  );

/*++

Routine Description:
  
  Perform any cleanup necessary when an image is unloaded. Basically it gives
  the EBC interpreter the chance to free up any resources allocated during
  load and execution of an EBC image.

Arguments:

  This          - protocol instance pointer
  ImageHandle   - the handle of the image being unloaded.

Returns:

  Standard EFI_STATUS.

--*/
typedef
EFI_STATUS
(EFIAPI *EFI_EBC_UNLOAD_IMAGE) (
  IN EFI_EBC_PROTOCOL           * This,
  IN EFI_HANDLE                 ImageHandle
  );

/*++

Routine Description:
  
  The I-Cache-flush registration service takes a pointer to a function to
  call to flush the I-Cache. Here's the prototype for that function pointer.

Arguments:

  Start         - physical start address of CPU instruction cache to flush.
  Length        - how many bytes to flush of the instruction cache.

Returns:

  Standard EFI_STATUS.

--*/
typedef
EFI_STATUS
(EFIAPI *EBC_ICACHE_FLUSH) (
  IN EFI_PHYSICAL_ADDRESS     Start,
  IN UINT64                   Length
  );

/*++

Routine Description:
  
  This routine is called by the core firmware to provide the EBC driver with
  a function to call to flush the CPU's instruction cache following creation
  of a thunk. It is not required.

Arguments:

  This      - protocol instance pointer
  Flush     - pointer to the function to call to flush the CPU instruction
              cache.

Returns:

  Standard EFI_STATUS.

--*/
typedef
EFI_STATUS
(EFIAPI *EFI_EBC_REGISTER_ICACHE_FLUSH) (
  IN EFI_EBC_PROTOCOL           * This,
  IN EBC_ICACHE_FLUSH           Flush
  );

/*++

Routine Description:
  
  This routine can be called to get the VM revision. It returns the same
  value as the EBC BREAK 1 instruction returns.

Arguments:

  This      - protocol instance pointer
  Version   - pointer to where to return the VM version

Returns:

  Standard EFI_STATUS.

--*/
typedef
EFI_STATUS
(EFIAPI *EFI_EBC_GET_VERSION) (
  IN EFI_EBC_PROTOCOL           * This,
  IN OUT UINT64                 *Version
  );

//
// Prototype for the actual EBC protocol interface
//
struct _EFI_EBC_PROTOCOL {
  EFI_EBC_CREATE_THUNK          CreateThunk;
  EFI_EBC_UNLOAD_IMAGE          UnloadImage;
  EFI_EBC_REGISTER_ICACHE_FLUSH RegisterICacheFlush;
  EFI_EBC_GET_VERSION           GetVersion;
};

//
// Extern the global EBC protocol GUID
//
extern EFI_GUID gEfiEbcProtocolGuid;

#endif