| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/h8300/platform/h8300h/generic/crt0_rom.S |
| 3 | * |
| 4 | * Yoshinori Sato <ysato@users.sourceforge.jp> |
| 5 | * |
| 6 | * Platform depend startup |
| 7 | * Target Archtecture: generic |
| 8 | * Memory Layout : ROM |
| 9 | */ |
| 10 | |
| 11 | #define ASSEMBLY |
| 12 | |
| 13 | #include <linux/config.h> |
| 14 | #include <asm/linkage.h> |
| 15 | |
| 16 | .global SYMBOL_NAME(_start) |
| 17 | .global SYMBOL_NAME(_command_line) |
| 18 | .global SYMBOL_NAME(_platform_gpio_table) |
| 19 | .global SYMBOL_NAME(_target_name) |
| 20 | |
| 21 | .h8300h |
| 22 | .section .text |
| 23 | .file "crt0_rom.S" |
| 24 | |
| 25 | /* CPU Reset entry */ |
| 26 | SYMBOL_NAME_LABEL(_start) |
| 27 | mov.l #__ramend,sp |
| 28 | ldc #0x80,ccr |
| 29 | |
| 30 | /* Peripheral Setup */ |
| 31 | |
| 32 | /* .bss clear */ |
| 33 | mov.l #__sbss,er5 |
| 34 | mov.l #__ebss,er4 |
| 35 | sub.l er5,er4 |
| 36 | shlr er4 |
| 37 | shlr er4 |
| 38 | sub.l er0,er0 |
| 39 | 1: |
| 40 | mov.l er0,@er5 |
| 41 | adds #4,er5 |
| 42 | dec.l #1,er4 |
| 43 | bne 1b |
| 44 | |
| 45 | /* copy .data */ |
| 46 | #if !defined(CONFIG_H8300H_SIM) |
| 47 | /* copy .data */ |
| 48 | mov.l #__begin_data,er5 |
| 49 | mov.l #__sdata,er6 |
| 50 | mov.l #__edata,er4 |
| 51 | sub.l er6,er4 |
| 52 | shlr.l er4 |
| 53 | shlr.l er4 |
| 54 | 1: |
| 55 | mov.l @er5+,er0 |
| 56 | mov.l er0,@er6 |
| 57 | adds #4,er6 |
| 58 | dec.l #1,er4 |
| 59 | bne 1b |
| 60 | #endif |
| 61 | |
| 62 | /* copy kernel commandline */ |
| 63 | mov.l #COMMAND_START,er5 |
| 64 | mov.l #SYMBOL_NAME(_command_line),er6 |
| 65 | mov.w #512,r4 |
| 66 | eepmov.w |
| 67 | |
| 68 | /* linux kernel start */ |
| 69 | ldc #0x90,ccr /* running kernel */ |
| 70 | mov.l #SYMBOL_NAME(init_thread_union),sp |
| 71 | add.l #0x2000,sp |
| 72 | jsr @_start_kernel |
| 73 | _exit: |
| 74 | |
| 75 | jmp _exit |
| 76 | |
| 77 | rts |
| 78 | |
| 79 | /* I/O port assign information */ |
| 80 | __platform_gpio_table: |
| 81 | mov.l #gpio_table,er0 |
| 82 | rts |
| 83 | |
| 84 | gpio_table: |
| 85 | ;; P1DDR |
| 86 | .byte 0x00,0x00 |
| 87 | ;; P2DDR |
| 88 | .byte 0x00,0x00 |
| 89 | ;; P3DDR |
| 90 | .byte 0x00,0x00 |
| 91 | ;; P4DDR |
| 92 | .byte 0x00,0x00 |
| 93 | ;; P5DDR |
| 94 | .byte 0x00,0x00 |
| 95 | ;; P6DDR |
| 96 | .byte 0x00,0x00 |
| 97 | ;; dummy |
| 98 | .byte 0x00,0x00 |
| 99 | ;; P8DDR |
| 100 | .byte 0x00,0x00 |
| 101 | ;; P9DDR |
| 102 | .byte 0x00,0x00 |
| 103 | ;; PADDR |
| 104 | .byte 0x00,0x00 |
| 105 | ;; PBDDR |
| 106 | .byte 0x00,0x00 |
| 107 | |
| 108 | .section .rodata |
| 109 | __target_name: |
| 110 | .asciz "generic" |
| 111 | |
| 112 | .section .bss |
| 113 | __command_line: |
| 114 | .space 512 |
| 115 | |
| 116 | /* interrupt vector */ |
| 117 | .section .vectors,"ax" |
| 118 | .long __start |
| 119 | vector = 1 |
| 120 | .rept 64-1 |
| 121 | .long _interrupt_redirect_table+vector*4 |
| 122 | vector = vector + 1 |
| 123 | .endr |