arch/h8300/platform/h8300h/generic/crt0_ram.S

   1 /*
   2  *  linux/arch/h8300/platform/h8300h/generic/crt0_ram.S
   3  *
   4  *  Yoshinori Sato <ysato@users.sourceforge.jp>
   5  *
   6  *  Platform depend startup
   7  *  Target Archtecture: AE-3068 (aka. aki3068net)
   8  *  Memory Layout     : RAM
   9  */
  10
  11 #define ASSEMBLY
  12
  13 #include <linux/config.h>
  14 #include <asm/linkage.h>
  15
  16 #if !defined(CONFIG_BLKDEV_RESERVE)
  17 #if defined(CONFIG_GDB_DEBUG)
  18 #define RAMEND (__ramend - 0xc000)
  19 #else
  20 #define RAMEND __ramend
  21 #endif
  22 #else
  23 #define RAMEND CONFIG_BLKDEV_RESERVE_ADDRESS
  24 #endif
  25
  26         .global SYMBOL_NAME(_start)
  27         .global SYMBOL_NAME(command_line)
  28         .global SYMBOL_NAME(_platform_gpio_table)
  29         .global SYMBOL_NAME(_target_name)
  30
  31         .h8300h
  32
  33         .section .text
  34         .file   "crt0_ram.S"
  35
  36         /* CPU Reset entry */
  37 SYMBOL_NAME_LABEL(_start)
  38         mov.l   #RAMEND,sp
  39         ldc     #0x80,ccr
  40
  41         /* Peripheral Setup */
  42
  43 #if defined(CONFIG_BLK_DEV_BLKMEM)
  44         /* move romfs image */
  45         jsr     @__move_romfs
  46 #endif
  47
  48         /* .bss clear */
  49         mov.l   #__sbss,er5
  50         mov.l   #__ebss,er4
  51         sub.l   er5,er4
  52         shlr    er4
  53         shlr    er4
  54         sub.l   er0,er0
  55 1:
  56         mov.l   er0,@er5
  57         adds    #4,er5
  58         dec.l   #1,er4
  59         bne     1b
  60
  61         /* copy kernel commandline */
  62         mov.l   #COMMAND_START,er5
  63         mov.l   #SYMBOL_NAME(command_line),er6
  64         mov.w   #512,r4
  65         eepmov.w
  66
  67         /* uClinux kernel start */
  68         ldc     #0x90,ccr       /* running kernel */
  69         mov.l   #SYMBOL_NAME(init_thread_union),sp
  70         add.l   #0x2000,sp
  71         jsr     @_start_kernel
  72 _exit:
  73
  74         jmp     _exit
  75
  76         rts
  77
  78         /* I/O port assign information */
  79 __platform_gpio_table:
  80         mov.l   #gpio_table,er0
  81         rts
  82
  83 gpio_table:
  84         ;; P1DDR
  85         .byte   0x00,0x00
  86         ;; P2DDR
  87         .byte   0x00,0x00
  88         ;; P3DDR
  89         .byte   0x00,0x00
  90         ;; P4DDR
  91         .byte   0x00,0x00
  92         ;; P5DDR
  93         .byte   0x00,0x00
  94         ;; P6DDR
  95         .byte   0x00,0x00
  96         ;; dummy
  97         .byte   0x00,0x00
  98         ;; P8DDR
  99         .byte   0x00,0x00
 100         ;; P9DDR
 101         .byte   0x00,0x00
 102         ;; PADDR
 103         .byte   0x00,0x00
 104         ;; PBDDR
 105         .byte   0x00,0x00
 106
 107 __target_name:
 108         .asciz  "generic"