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/*

 *  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.

 *

 *

 *  COPYRIGHT (c) 1998.

 *  On-Line Applications Research Corporation (OAR).

 *  Copyright assigned to U.S. Government, 1994.

 *

 *  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.

 *

 *  $Id: start.rom,v 1.2 2001-09-27 12:01:12 chris Exp $

 */

#include "asm.h"

        BEGIN_CODE

        PUBLIC(start)

SYM (start):

        ! install the stack pointer

        mov.l   stack_k,r15

        ! 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

        ! copy the vector table from rom to ram

        mov.l   vects_k,r0      ! vectab

        mov     #0,r1           ! address of boot vector table

        mov     #0,r2           | number of bytes copied

        mov.w   vects_size,r3   ! size of entries in vectab

1:

        mov.l   @r1+,r4

        mov.l   r4,@r0

        add     #4,r0

        add     #1,r2

        cmp/hi  r3,r2

        bf      1b

        mov.l   vects_k,r0      ! update vbr to point to vectab

        ldc     r0,vbr

        ! call the mainline

        mov #0,r4               ! argc

        mov.l main_k,r0

        jsr @r0

        mov #0,r5               ! argv

        ! call exit

        mov     r0,r4

        mov.l   exit_k,r0

        jsr     @r0

        or      r0,r0

        END_CODE

        .align 2

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)

vects_k:

        .long   SYM(vectab)

vects_size:

        .word   255

#ifdef __ELF__

        .section .stack,"aw"

#else

        .section .stack

#endif

SYM(stack):

        .long   0xdeaddead