Subversion Repositories openrisc

#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, 2003 Free Software Foundation, Inc.
##
## 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.,    
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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 v2.                                               
##
## This exception does not invalidate any other reasons why a work based    
## on this file might be covered by the GNU General Public 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 <cyg/hal/variant.inc>
##              
##
######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