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/*

 * start.S -- Initialization code for SH4 simulator BSP

 *

 * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia

 * Author: Victor V. Vengerov 

 *

 * Based on work:

 *  Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and

 *           Bernd Becker (becker@faw.uni-ulm.de)

 *

 *  COPYRIGHT (c) 1997-1998, FAW Ulm, Germany

 *

 *  This program 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.

 *

 *  Modified to reflect Hitachi EDK SH7045F:

 *  John M. Mills (jmills@tga.com)

 *  TGA Technologies, Inc.

 *  100 Pinnacle Way, Suite 140

 *  Norcross, GA 30071 U.S.A.

 *

 *

 *  This modified file may be copied and distributed in accordance

 *  the above-referenced license. It is provided for critique and

 *  developmental purposes without any warranty nor representation

 *  by the authors or by TGA Technologies.

 *

 *  COPYRIGHT (c) 1999-2001.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  start.S,v 1.1 2001/10/11 21:04:35 joel Exp

 */

#include "asm.h"

#include "rtems/score/sh4_regs.h"

        BEGIN_CODE

        PUBLIC(start)

SYM (start):

        ! install the stack pointer

        mov.l   stack_k,r15

        mov.l   initial_sr_k,r0

        ldc     r0,ssr

        ldc     r0,sr

        ! Set up VBR register

        mov.l   _vbr_base_k,r0

        ldc     r0,vbr

#ifdef  START_HW_INIT   /* from $RTEMS_BSP.cfg */

        ! Initialize minimal hardware

        mov.l   hw_init_k, r0

        jsr @r0

        nop             !dead slot

#endif /* START_HW_INIT */

        ! zero out bss

        mov.l   edata_k,r0

        mov.l   end_k,r1

        mov     #0,r2

0:

        mov.l   r2,@r0

        add     #4,r0

        cmp/ge  r0,r1

        bt      0b

        ! initialise fpscr for gcc

        mov.l set_fpscr_k, r1

        jsr @r1

        nop

        ! Set FPSCR register

        mov.l   initial_fpscr_k,r0

        lds     r0,fpscr

        ! call the mainline

        mov #0,r4               ! argc

        mov.l main_k,r0

        jsr @r0

        mov #0,r5               ! argv - can place in dead slot

        ! call exit

        mov     r0,r4

        mov.l   exit_k,r0

        jsr     @r0

        or      r0,r0

        ! stop the simulator

        trapa   #2

        nop

        .global ___trap34

___trap34:

        trapa   #34

!       tst     r1,r1   ! r1 is errno

!       bt      ret

!       mov.l   perrno,r2

!       mov.l   r1,@r2

!ret:

        rts

        nop

!       .align  2

!perrno:

!       .long   _errno

        END_CODE

        .align 2

set_fpscr_k:

    .long   ___set_fpscr

_vbr_base_k:

        .long   SYM(_vbr_base)

stack_k:

        .long   SYM(stack)

edata_k:

        .long   SYM(edata)

end_k:

        .long   SYM(end)

main_k:

        .long   SYM(boot_card)

exit_k:

        .long   SYM(exit)

#ifdef  START_HW_INIT   /* from $RTEMS_BSP.cfg */

hw_init_k:

        .long   SYM(early_hw_init)

#endif /* START_HW_INIT */

vects_k:

        .long   SYM(vectab)

vects_size:

        .word   255

    .align 2

initial_sr_k:

        .long   SH4_SR_MD | SH4_SR_RB | SH4_SR_IMASK

initial_fpscr_k:

#ifdef __SH4__

        .long   SH4_FPSCR_DN | SH4_FPSCR_PR | SH4_FPSCR_RM

#else

        .long   SH4_FPSCR_DN | SH4_FPSCR_RM

#endif

#ifdef __ELF__

        .section .stack,"aw"

#else

        .section .stack

#endif

SYM(stack):

        .long   0xdeaddead

#ifdef __ELF__

        .section .bss,"aw"

#else

        .section .bss

#endif

        .global __sh4sim_dummy_register

__sh4sim_dummy_register:

        .long   0