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#ifndef CYGONCE_HAL_PLATFORM_INC
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#define CYGONCE_HAL_PLATFORM_INC
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##=============================================================================
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##
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##      platform.inc
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##
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##      Platform specific assembler header file
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##
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##=============================================================================
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#####ECOSGPLCOPYRIGHTBEGIN####
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## -------------------------------------------
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## This file is part of eCos, the Embedded Configurable Operating System.
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## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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## Copyright (C) 2002, 2003 Gary Thomas
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##
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## eCos is free software; you can redistribute it and/or modify it under
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## the terms of the GNU General Public License as published by the Free
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## Software Foundation; either version 2 or (at your option) any later version.
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##
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## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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## WARRANTY; without even the implied warranty of MERCHANTABILITY or
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## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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## for more details.
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##
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## You should have received a copy of the GNU General Public License along
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## with eCos; if not, write to the Free Software Foundation, Inc.,
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## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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##
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## As a special exception, if other files instantiate templates or use macros
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## or inline functions from this file, or you compile this file and link it
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## with other works to produce a work based on this file, this file does not
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## by itself cause the resulting work to be covered by the GNU General Public
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## License. However the source code for this file must still be made available
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## in accordance with section (3) of the GNU General Public License.
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##
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## This exception does not invalidate any other reasons why a work based on
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## this file might be covered by the GNU General Public License.
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##
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## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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## at http://sources.redhat.com/ecos/ecos-license/
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## -------------------------------------------
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#####ECOSGPLCOPYRIGHTEND####
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##=============================================================================
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#######DESCRIPTIONBEGIN####
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##
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## Author(s):   gthomas
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## Contributors:
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## Date:        2002-07-31
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## Purpose:     Platform specific assembly code
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## Description: This file contains various definitions and macros that are
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##              useful for writing assembly code for the platform.
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## Usage:       included from 
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##
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##
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######DESCRIPTIONEND####
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##
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##=============================================================================
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##-----------------------------------------------------------------------------
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## MPC82xx interrupt handling.
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#ifndef CYGPKG_HAL_POWERPC_INTC_DEFINED
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        # decode the interrupt
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        .macro  hal_intc_decode dreg,state
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        lwz     \dreg,CYGARC_PPCREG_VECTOR(\state) # retrieve vector number,
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        rlwinm. \dreg,\dreg,22,31,31            # isolate bit 21
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        beq     0f                              # done if decrementer (vec 0)
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        lwi     \dreg,_CSB281_EPIC_IACK         # if external, get vector
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        li      r0,0
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        lwbrx   \dreg,r0,\dreg                  # EPIC is little endian!
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        cmpi    0,\dreg,0xFF                    # spurious interrupt?
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        beq     restore_state
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        lwi     r3,_CSB281_EPIC_EOI             # clear interrupt?
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        stw     r0,0(r3)
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0:      stw     \dreg,CYGARC_PPCREG_VECTOR(\state) # update vector in state frame.
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        slwi    \dreg,\dreg,2                   # convert to byte offset.
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        .endm
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#define CYGPKG_HAL_POWERPC_INTC_DEFINED
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#endif // CYGPKG_HAL_POWERPC_INTC_DEFINED
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#------------------------------------------------------------------------------
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#endif // ifndef CYGONCE_HAL_PLATFORM_INC
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# end of platform.inc

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