arch/h8300/kernel/head_rom.S

   1 #include <linux/init.h>
   2 #include <asm/thread_info.h>
   3
   4 #if defined(CONFIG_CPU_H8300H)
   5         .h8300h
   6 #define SYSCR 0xfee012
   7 #define IRAMTOP 0xffff20
   8 #define NR_INT 64
   9 #endif
  10 #if defined(CONFIG_CPU_H8S)
  11         .h8300s
  12 #define INTCR 0xffff31
  13 #define IRAMTOP 0xffc000
  14 #define NR_INT 128
  15 #endif
  16
  17         __HEAD
  18         .global _start
  19 _start:
  20         mov.l   #IRAMTOP,sp
  21 #if !defined(CONFIG_H8300H_SIM) && \
  22     !defined(CONFIG_H8S_SIM)
  23         jsr     @lowlevel_init
  24
  25         /* copy .data */
  26         mov.l   #_begin_data,er5
  27         mov.l   #_sdata,er6
  28         mov.l   #_edata,er4
  29         sub.l   er6,er4
  30         shlr.l  er4
  31         shlr.l  er4
  32 1:
  33         mov.l   @er5+,er0
  34         mov.l   er0,@er6
  35         adds    #4,er6
  36         dec.l   #1,er4
  37         bne     1b
  38         /* .bss clear */
  39         mov.l   #_sbss,er5
  40         mov.l   #_ebss,er4
  41         sub.l   er5,er4
  42         shlr    er4
  43         shlr    er4
  44         sub.l   er0,er0
  45 1:
  46         mov.l   er0,@er5
  47         adds    #4,er5
  48         dec.l   #1,er4
  49         bne     1b
  50 #else
  51         /* get cmdline from gdb */
  52         jsr     @0xcc
  53         ;; er0 - argc
  54         ;; er1 - argv
  55         mov.l   #command_line,er3
  56         adds    #4,er1
  57         dec.l   #1,er0
  58         beq     4f
  59 1:
  60         mov.l   @er1+,er2
  61 2:
  62         mov.b   @er2+,r4l
  63         beq     3f
  64         mov.b   r4l,@er3
  65         adds    #1,er3
  66         bra     2b
  67 3:
  68         mov.b   #' ',r4l
  69         mov.b   r4l,@er3
  70         adds    #1,er3
  71         dec.l   #1,er0
  72         bne     1b
  73         subs    #1,er3
  74         mov.b   #0,r4l
  75         mov.b   r4l,@er3
  76 4:
  77 #endif
  78         sub.l   er0,er0
  79         jsr     @h8300_fdt_init
  80         /* linux kernel start */
  81 #if defined(CONFIG_CPU_H8300H)
  82         ldc     #0xd0,ccr       /* running kernel */
  83         mov.l   #SYSCR,er0
  84         bclr    #3,@er0
  85 #endif
  86 #if defined(CONFIG_CPU_H8S)
  87         ldc     #0x07,exr
  88         bclr    #4,@INTCR:8
  89         bset    #5,@INTCR:8     /* Interrupt mode 2 */
  90         ldc     #0x90,ccr       /* running kernel */
  91 #endif
  92         mov.l   #init_thread_union,sp
  93         add.l   #0x2000,sp
  94         jsr     @start_kernel
  95
  96 1:
  97         bra     1b
  98
  99 #if defined(CONFIG_ROMKERNEL)
 100         /* interrupt vector */
 101         .section .vectors,"ax"
 102         .long   _start
 103         .long   _start
 104 vector  =       2
 105         .rept   NR_INT - 2
 106         .long   _interrupt_redirect_table+vector*4
 107 vector  =       vector + 1
 108         .endr
 109 #endif
 110         .end