arch/h8300/platform/h8s/edosk2674/crt0_ram.S

   1 /*
   2  *  linux/arch/h8300/platform/h8s/edosk2674/crt0_ram.S
   3  *
   4  *  Yoshinori Sato <ysato@users.sourceforge.jp>
   5  *
   6  *  Platform depend startup
   7  *  Target Archtecture: EDOSK-2674
   8  *  Memory Layout     : RAM
   9  */
  10
  11 #define ASSEMBLY
  12
  13 #include <asm/linkage.h>
  14 #include <asm/regs267x.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         .h8300s
  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         ldc     #0x00,exr
  41
  42         /* Peripheral Setup */
  43         bclr    #4,@INTCR:8     /* interrupt mode 2 */
  44         bset    #5,@INTCR:8
  45         bclr    #0,@IER+1:16
  46         bset    #1,@ISCRL+1:16  /* IRQ0 Positive Edge */
  47         bclr    #0,@ISCRL+1:16
  48
  49 #if defined(CONFIG_MTD_UCLINUX)
  50         /* move romfs image */
  51         jsr     @__move_romfs
  52 #endif
  53
  54         /* .bss clear */
  55         mov.l   #__sbss,er5
  56         mov.l   er5,er6
  57         mov.l   #__ebss,er4
  58         sub.l   er5,er4
  59         shlr    #2,er4
  60         sub.l   er0,er0
  61 1:
  62         mov.l   er0,@er5
  63         adds    #4,er5
  64         dec.l   #1,er4
  65         bne     1b
  66
  67         /* copy kernel commandline */
  68         mov.l   #COMMAND_START,er5
  69         mov.l   #SYMBOL_NAME(command_line),er6
  70         mov.w   #512,r4
  71         eepmov.w
  72
  73         /* uClinux kernel start */
  74         ldc     #0x90,ccr       /* running kernel */
  75         mov.l   #SYMBOL_NAME(init_thread_union),sp
  76         add.l   #0x2000,sp
  77         jsr     @_start_kernel
  78 _exit:
  79
  80         jmp     _exit
  81
  82         rts
  83
  84         /* I/O port assign information */
  85 __platform_gpio_table:
  86         mov.l   #gpio_table,er0
  87         rts
  88
  89 gpio_table:
  90         ;; P1DDR
  91         ;;      used,ddr
  92         .byte   0x00,0x00
  93         ;; P2DDR
  94         .byte   0x00,0x00
  95         ;; P3DDR
  96         .byte   0x3f,0x3a
  97         ;; dummy
  98         .byte   0x00,0x00
  99         ;; P5DDR
 100         .byte   0x00,0x00
 101         ;; P6DDR
 102         .byte   0x00,0x00
 103         ;; P7DDR
 104         .byte   0x00,0x00
 105         ;; P8DDR
 106         .byte   0x00,0x00
 107         ;; dummy
 108         .byte   0x00,0x00
 109         ;; PADDR
 110         .byte   0xff,0xff
 111         ;; PBDDR
 112         .byte   0xff,0x00
 113         ;; PCDDR
 114         .byte   0xff,0x00
 115         ;; PDDDR
 116         .byte   0xff,0x00
 117         ;; PEDDR
 118         .byte   0xff,0x00
 119         ;; PFDDR
 120         .byte   0xff,0xff
 121         ;; PGDDR
 122         .byte   0x0f,0x0f
 123         ;; PHDDR
 124         .byte   0x0f,0x0f
 125
 126 __target_name:
 127         .asciz  "EDOSK-2674"
 128
 129         .section .bootvec,"ax"
 130         jmp     @SYMBOL_NAME(_start)