arch/h8300/lib/romfs.S

   1 /* romfs move to __ebss */
   2
   3 #include <asm/linkage.h>
   4
   5 #if defined(__H8300H__)
   6         .h8300h
   7 #endif
   8 #if defined(__H8300S__)
   9         .h8300s
  10 #endif
  11
  12 #define BLKOFFSET 512
  13
  14         .text
  15 .globl  __move_romfs
  16 _romfs_sig_len = 8
  17
  18 __move_romfs:
  19         mov.l   #__sbss,er0
  20         mov.l   #_romfs_sig,er1
  21         mov.b   #_romfs_sig_len,r3l
  22 1:                                      /* check romfs image */
  23         mov.b   @er0+,r2l
  24         mov.b   @er1+,r2h
  25         cmp.b   r2l,r2h
  26         bne     2f
  27         dec.b   r3l
  28         bne     1b
  29
  30         /* find romfs image */
  31         mov.l   @__sbss+8,er0           /* romfs length(be) */
  32         mov.l   #__sbss,er1
  33         add.l   er0,er1                 /* romfs image end */
  34         mov.l   #__ebss,er2
  35         add.l   er0,er2                 /* distination address */
  36 #if defined(CONFIG_INTELFLASH)
  37         add.l   #BLKOFFSET,er2
  38 #endif
  39         adds    #2,er0
  40         adds    #1,er0
  41         shlr    er0
  42         shlr    er0                     /* transfer length */
  43 1:
  44         mov.l   @er1,er3                /* copy image */
  45         mov.l   er3,@er2
  46         subs    #4,er1
  47         subs    #4,er2
  48         dec.l   #1,er0
  49         bpl     1b
  50 2:
  51         rts
  52
  53         .section        .rodata
  54 _romfs_sig:
  55         .ascii  "-rom1fs-"
  56
  57         .end