arch/sh/cpu/sh2/start.S

   1 /*
   2  * Copyright (C) 2007,2008 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
   3  * Copyright (C) 2008 Renesas Solutions Corp.
   4
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  18  * MA 02111-1307 USA
  19  */
  20
  21 #include <asm-offsets.h>
  22 #include <config.h>
  23 #include <version.h>
  24
  25         .text
  26         .align  2
  27
  28         .global _start
  29 _start:
  30         .long 0x00000010        /* Ppower ON reset PC*/
  31         .long 0x00000000
  32         .long 0x00000010        /* Manual reset PC */
  33         .long 0x00000000
  34 _init:
  35         mov.l   ._lowlevel_init, r0
  36 100:    bsrf    r0
  37         nop
  38         bsr     1f
  39         nop
  40 1:      sts     pr, r5
  41         mov.l   ._reloc_dst, r4
  42         add     #(_start-1b), r5
  43         mov.l   ._reloc_dst_end, r6
  44
  45 2:      mov.l   @r5+, r1
  46         mov.l   r1, @r4
  47         add     #4, r4
  48         cmp/hs  r6, r4
  49         bf      2b
  50
  51         mov.l   ._bss_start, r4
  52         mov.l   ._bss_end, r5
  53         mov     #0, r1
  54
  55 3:      mov.l   r1, @r4                 /* bss clear */
  56         add     #4, r4
  57         cmp/hs  r5, r4
  58         bf      3b
  59
  60         mov.l   ._gd_init, r13          /* global data */
  61         mov.l   ._stack_init, r15       /* stack */
  62
  63         mov.l   ._sh_generic_init, r0
  64         jsr     @r0
  65         nop
  66
  67 loop:
  68         bra     loop
  69
  70         .align  2
  71
  72 ._lowlevel_init:        .long   (lowlevel_init - (100b + 4))
  73 ._reloc_dst:            .long   reloc_dst
  74 ._reloc_dst_end:        .long   reloc_dst_end
  75 ._bss_start:            .long   bss_start
  76 ._bss_end:              .long   bss_end
  77 ._gd_init:              .long   (_start - GENERATED_GBL_DATA_SIZE)
  78 ._stack_init:   .long   (_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
  79 ._sh_generic_init:      .long   sh_generic_init