variant.inc

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#ifndef CYGONCE_HAL_VARIANT_INC
#define CYGONCE_HAL_VARIANT_INC
##=============================================================================
##
##      variant.inc
##
##      SH4 variant 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) 2003 Nick Garnett 
##
## 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):   jskov
## Contributors:jskov, nickg
## Date:        2000-10-30
## Purpose:     SH4 variant definitions and init code
## Description: This file contains various definitions and macros that are
##              useful for writing assembly code for the SH3 CPU family.
## Usage:
##              #include <cyg/hal/variant.inc>
##              ...
##              
##
######DESCRIPTIONEND####
##
##=============================================================================

#include <pkgconf/hal.h>
#include <cyg/hal/sh_regs.h>
        
#===========================================================================
## SR initialization value
## zero all bits except:
## MD = Processor operation mode field (privileged mode)
## I0-3 = Mask out all interrupts but NMI.
##
## When saving or restoring the state of an exception or interrupt, the bit
## CYGARC_REG_SR_RB is also set, switching the register bank. When this bit
## is set, interrupts must be disabled.
##
## Note: We could also use the BL bit to prevent interrupts, but that would
##       also prevent the use of breakpoints.

#define CYG_SR (CYGARC_REG_SR_MD|CYGARC_REG_SR_IMASK)
#define CYG_SR_BANK1 (CYGARC_REG_SR_MD|CYGARC_REG_SR_IMASK|CYGARC_REG_SR_RB)

##-----------------------------------------------------------------------------
## Cache control register initialization
##
## If we are starting from ROM, or are a RAM resident monitor, disable the cache
## initially. Otherwise we are a RAM loaded application, so keep the cache
## enabled.

#if     !defined(CYG_HAL_STARTUP_RAM) ||                \
        (       defined(CYG_HAL_STARTUP_RAM) &&         \
                !defined(CYGSEM_HAL_USE_ROM_MONITOR))
#define CYGARC_REG_CCR_INIT     CYGARC_REG_CCR_EMODE
#else
#define CYGARC_REG_CCR_INIT     (CYGARC_REG_CCR_CE|CYGARC_REG_CCR_EMODE)
#endif

##-----------------------------------------------------------------------------
## Hardware init macros
#ifndef CYGPKG_HAL_SH_POST_RESET_INIT
        .macro  hal_post_reset_init
        # Initialize CPU
        mov.l   $nCYG_SR,r1             ! Put CPU in a well-known state
        ldc     r1,sr
        mov.l   $nCYG_FPSCR,r1
        lds     r1,fpscr
        mov.l   $nCYGARC_REG_CCR_INIT,r0
        mov.l   $nCYGARC_REG_CCR,r1     ! Disable cache
        mov.l   r0,@r1
        mov     #0,r0
        mov.l   $nCYGARC_REG_MMUCR,r1   ! Disable MMU
        mov.l   r0,@r1
        mov.l   $nCYGARC_REG_BBRA,r1    ! Disable UBC Channel A
        mov.w   r0,@r1
        mov.l   $nCYGARC_REG_BBRB,r1    ! Disable UBC Channel B
        mov.w   r0,@r1
        mov.l   $nCYGARC_REG_BRCR,r1    ! Reset UBC common register
        mov.w   r0,@r1
        mov.l   $CYGARC_REG_TSTR,r1     ! Disable timers
        mov.b   r0,@r1
        mov.l   $CYGARC_REG_IPRA,r1     ! Disable interrupt request sources
        mov.w   r0,@r1
        mov.l   $CYGARC_REG_IPRB,r1
        mov.w   r0,@r1
        mov.l   $CYGARC_REG_IPRC,r1
        mov.w   r0,@r1
#if (CYGARC_SH_MOD_INTC == 2)
        mov.l   $CYGARC_REG_IPRD,r1
        mov.w   r0,@r1
#endif
        mov.w   $nCYG_WTCSR,r0          ! Clear watchdog
        mov.l   $nCYGARC_REG_WTCSR,r1
        mov.w   r0,@r1
        mov.w   $nCYG_ICR_INIT,r0
        mov.l   $CYGARC_REG_ICR,r1      ! Set interrupt controller to IRQ mode
        mov.w   r0,@r1

        # Initialize VBR if necessary
#if     !defined(CYG_HAL_STARTUP_RAM) ||                \
        (       defined(CYG_HAL_STARTUP_RAM) &&         \
                !defined(CYGSEM_HAL_USE_ROM_MONITOR))
        mov.l   $_reset,r1             ! Set VBR
        ldc     r1,vbr
#endif
        bra     1f
         nop
        
$nCYG_WTCSR:
        .word   0xa500          ! clear all CSR bits

        .align  2
$nCYG_SR:
        .long   CYG_SR
$nCYG_FPSCR:
        .long   CYG_FPSCR
$nCYGARC_REG_CCR:
        .long   CYGARC_REG_CCR
$nCYGARC_REG_CCR_INIT:
        .long   CYGARC_REG_CCR_INIT
$nCYGARC_REG_MMUCR:
        .long   CYGARC_REG_MMUCR
$nCYGARC_REG_BBRA:
        .long   CYGARC_REG_BBRA
$nCYGARC_REG_BBRB:
        .long   CYGARC_REG_BBRB
$nCYGARC_REG_BRCR:
        .long   CYGARC_REG_BRCR
$CYGARC_REG_TSTR:
        .long   CYGARC_REG_TSTR
$CYGARC_REG_IPRA:
        .long   CYGARC_REG_IPRA
$CYGARC_REG_IPRB:
        .long   CYGARC_REG_IPRB
$CYGARC_REG_IPRC:
        .long   CYGARC_REG_IPRC
#if (CYGARC_SH_MOD_INTC == 2)
$CYGARC_REG_IPRD:
        .long   CYGARC_REG_IPRD
#endif
$nCYGARC_REG_WTCSR:
        .long   CYGARC_REG_WTCSR
$CYGARC_REG_ICR:
        .long   CYGARC_REG_ICR
        SYM_PTR_REF(_reset)
	# Data below only need word alignment
$nCYG_ICR_INIT:
        .word   CYGARC_REG_ICR_INIT

1:      
        .endm
#define CYGPKG_HAL_SH_POST_RESET_INIT
#endif

##-----------------------------------------------------------------------------
## Interrupt decode macros
	.macro	hal_intc_decode tmp,inum
        mov.l   1f,\tmp
        mov.l   @\tmp,\inum
        mov     #-5,\tmp                ! divide cause by 0x20
        shld    \tmp,\inum
	bra     2f
         add     #-14,\inum             ! adjust so NMI becomes 0
	.align  2
1:	.long   CYGARC_REG_INTEVT
2:
        .endm
        
#ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
        .macro  hal_intc_translate inum,vnum
        mov     #0,\vnum                ! Just vector zero is supported
        .endm
#else                   
        .macro  hal_intc_translate inum,vnum
        mov     \inum,\vnum             ! Vector == interrupt number
        shll2   \vnum                   ! get from vector number to ISR index
        .endm
#endif

#------------------------------------------------------------------------------
#endif // CYGONCE_HAL_VARIANT_INC
# end of variant.inc