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#ifndef CYGONCE_HAL_PLATFORM_INC

#define CYGONCE_HAL_PLATFORM_INC

##=============================================================================

##

##      platform.inc

##

##      Platform specific assembler header file

##

##=============================================================================

#####ECOSGPLCOPYRIGHTBEGIN####

## -------------------------------------------

## This file is part of eCos, the Embedded Configurable Operating System.

## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

## Copyright (C) 2002, 2003 Gary Thomas

##

## eCos is free software; you can redistribute it and/or modify it under

## the terms of the GNU General Public License as published by the Free

## Software Foundation; either version 2 or (at your option) any later version.

##

## eCos is distributed in the hope that it will be useful, but WITHOUT ANY

## WARRANTY; without even the implied warranty of MERCHANTABILITY or

## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

## for more details.

##

## You should have received a copy of the GNU General Public License along

## with eCos; if not, write to the Free Software Foundation, Inc.,

## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

##

## As a special exception, if other files instantiate templates or use macros

## or inline functions from this file, or you compile this file and link it

## with other works to produce a work based on this file, this file does not

## by itself cause the resulting work to be covered by the GNU General Public

## License. However the source code for this file must still be made available

## in accordance with section (3) of the GNU General Public License.

##

## This exception does not invalidate any other reasons why a work based on

## this file might be covered by the GNU General Public License.

##

## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

## at http://sources.redhat.com/ecos/ecos-license/

## -------------------------------------------

#####ECOSGPLCOPYRIGHTEND####

##=============================================================================

#######DESCRIPTIONBEGIN####

##

## Author(s):   gthomas

## Contributors:

## Date:        2002-07-31

## Purpose:     Platform specific assembly code

## Description: This file contains various definitions and macros that are

##              useful for writing assembly code for the platform.

## Usage:       included from 

##

##

######DESCRIPTIONEND####

##

##=============================================================================

##-----------------------------------------------------------------------------

## MPC82xx interrupt handling.

#ifndef CYGPKG_HAL_POWERPC_INTC_DEFINED

        # decode the interrupt

        .macro  hal_intc_decode dreg,state

        lwz     \dreg,CYGARC_PPCREG_VECTOR(\state) # retrieve vector number,

        rlwinm. \dreg,\dreg,22,31,31            # isolate bit 21

        beq     0f                              # done if decrementer (vec 0)

        lwi     \dreg,_CSB281_EPIC_IACK         # if external, get vector

        li      r0,0

        lwbrx   \dreg,r0,\dreg                  # EPIC is little endian!

        cmpi    0,\dreg,0xFF                    # spurious interrupt?

        beq     restore_state

        lwi     r3,_CSB281_EPIC_EOI             # clear interrupt?

        stw     r0,0(r3)

0:      stw     \dreg,CYGARC_PPCREG_VECTOR(\state) # update vector in state frame.

        slwi    \dreg,\dreg,2                   # convert to byte offset.

        .endm

#define CYGPKG_HAL_POWERPC_INTC_DEFINED

#endif // CYGPKG_HAL_POWERPC_INTC_DEFINED

#------------------------------------------------------------------------------

#endif // ifndef CYGONCE_HAL_PLATFORM_INC

# end of platform.inc