LXR linux/arch/h8300/platform/h8300h/h8max/crt0

   1/*
   2 *  linux/arch/h8300/platform/h8300h/h8max/crt0_ram.S
   3 *
   4 *  Yoshinori Sato <ysato@users.sourceforge.jp>
   5 *
   6 *  Platform depend startup
   7 *  Target Archtecture: H8MAX
   8 *  Memory Layout     : RAM
   9 */
  10
  11#define ASSEMBLY
  12
  13#include <asm/linkage.h>
  14        
  15#if !defined(CONFIG_BLKDEV_RESERVE)
  16#if defined(CONFIG_GDB_DEBUG)
  17#define RAMEND (__ramend - 0xc000)
  18#else
  19#define RAMEND __ramend
  20#endif
  21#else
  22#define RAMEND CONFIG_BLKDEV_RESERVE_ADDRESS
  23#endif
  24        
  25        .global SYMBOL_NAME(_start)
  26        .global SYMBOL_NAME(command_line)
  27        .global SYMBOL_NAME(_platform_gpio_table)
  28        .global SYMBOL_NAME(_target_name)
  29        
  30        .h8300h
  31
  32        .section .text
  33        .file   "crt0_ram.S"
  34
  35        /* CPU Reset entry */
  36SYMBOL_NAME_LABEL(_start)
  37        mov.l   #RAMEND,sp
  38        ldc     #0x80,ccr
  39
  40        /* Peripheral Setup */
  41        
  42#if defined(CONFIG_MTD_UCLINUX)
  43        /* move romfs image */
  44        jsr     @__move_romfs   
  45#endif
  46        
  47        /* .bss clear */
  48        mov.l   #__sbss,er5
  49        mov.l   #__ebss,er4
  50        sub.l   er5,er4
  51        shlr    er4
  52        shlr    er4
  53        sub.l   er0,er0
  541:      
  55        mov.l   er0,@er5
  56        adds    #4,er5
  57        dec.l   #1,er4
  58        bne     1b
  59
  60        /* copy kernel commandline */
  61        mov.l   #COMMAND_START,er5
  62        mov.l   #SYMBOL_NAME(command_line),er6
  63        mov.w   #512,r4
  64        eepmov.w
  65
  66        /* uClinux kernel start */
  67        ldc     #0x90,ccr       /* running kernel */
  68        mov.l   #SYMBOL_NAME(init_thread_union),sp
  69        add.l   #0x2000,sp
  70        jsr     @_start_kernel
  71_exit:
  72
  73        jmp     _exit
  74
  75        rts
  76
  77        /* I/O port assign information */
  78__platform_gpio_table:  
  79        mov.l   #gpio_table,er0
  80        rts
  81
  82gpio_table:
  83        ;; P1DDR
  84        .byte   0xff,0xff
  85        ;; P2DDR
  86        .byte   0xff,0xff
  87        ;; P3DDR
  88        .byte   0x00,0x00
  89        ;; P4DDR
  90        .byte   0x00,0x00
  91        ;; P5DDR
  92        .byte   0x01,0x01
  93        ;; P6DDR
  94        .byte   0xf6,0xf6
  95        ;; dummy
  96        .byte   0x00,0x00
  97        ;; P8DDR
  98        .byte   0xee,0xee
  99        ;; P9DDR
 100        .byte   0x00,0x00
 101        ;; PADDR
 102        .byte   0x00,0x00
 103        ;; PBDDR
 104        .byte   0x30,0x30
 105
 106__target_name:  
 107        .asciz  "H8MAX"
 108        
 109        .section .bootvec,"ax"
 110        jmp     @SYMBOL_NAME(_start)
 111