| /* |
| * linux/arch/h8300/platform/h8s/generic/crt0_rom.S |
| * |
| * Yoshinori Sato <ysato@users.sourceforge.jp> |
| * |
| * Platform depend startup |
| * Target Archtecture: generic |
| * Memory Layout : ROM |
| */ |
| |
| #define ASSEMBLY |
| |
| #include <linux/config.h> |
| #include <asm/linkage.h> |
| #include <asm/regs267x.h> |
| |
| .global SYMBOL_NAME(_start) |
| .global SYMBOL_NAME(_command_line) |
| .global SYMBOL_NAME(_platform_gpio_table) |
| .global SYMBOL_NAME(_target_name) |
| |
| .h8300s |
| .section .text |
| .file "crt0_rom.S" |
| |
| /* CPU Reset entry */ |
| SYMBOL_NAME_LABEL(_start) |
| mov.l #__ramend,sp |
| ldc #0x80,ccr |
| ldc #0,exr |
| bclr #4,@INTCR:8 |
| bset #5,@INTCR:8 /* Interrupt mode 2 */ |
| |
| /* Peripheral Setup */ |
| |
| /* copy .data */ |
| #if !defined(CONFIG_H8S_SIM) |
| mov.l #__begin_data,er5 |
| mov.l #__sdata,er6 |
| mov.l #__edata,er4 |
| sub.l er6,er4 |
| shlr.l #2,er4 |
| 1: |
| mov.l @er5+,er0 |
| mov.l er0,@er6 |
| adds #4,er6 |
| dec.l #1,er4 |
| bne 1b |
| #endif |
| |
| /* .bss clear */ |
| mov.l #__sbss,er5 |
| mov.l #__ebss,er4 |
| sub.l er5,er4 |
| shlr.l #2,er4 |
| sub.l er0,er0 |
| 1: |
| mov.l er0,@er5 |
| adds #4,er5 |
| dec.l #1,er4 |
| bne 1b |
| |
| /* linux kernel start */ |
| ldc #0x90,ccr /* running kernel */ |
| mov.l #SYMBOL_NAME(init_thread_union),sp |
| add.l #0x2000,sp |
| jsr @_start_kernel |
| _exit: |
| |
| jmp _exit |
| |
| rts |
| |
| /* I/O port assign information */ |
| __platform_gpio_table: |
| mov.l #gpio_table,er0 |
| rts |
| |
| gpio_table: |
| ;; P1DDR |
| .byte 0x00,0x00 |
| ;; P2DDR |
| .byte 0x00,0x00 |
| ;; P3DDR |
| .byte 0x00,0x00 |
| ;; P4DDR |
| .byte 0x00,0x00 |
| ;; P5DDR |
| .byte 0x00,0x00 |
| ;; P6DDR |
| .byte 0x00,0x00 |
| ;; dummy |
| .byte 0x00,0x00 |
| ;; P8DDR |
| .byte 0x00,0x00 |
| ;; PADDR |
| .byte 0x00,0x00 |
| ;; PBDDR |
| .byte 0x00,0x00 |
| ;; PCDDR |
| .byte 0x00,0x00 |
| ;; PDDDR |
| .byte 0x00,0x00 |
| ;; PEDDR |
| .byte 0x00,0x00 |
| ;; PFDDR |
| .byte 0x00,0x00 |
| ;; PGDDR |
| .byte 0x00,0x00 |
| ;; PHDDR |
| .byte 0x00,0x00 |
| |
| .section .rodata |
| __target_name: |
| .asciz "generic" |
| |
| .section .bss |
| __command_line: |
| .space 512 |
| |
| /* interrupt vector */ |
| .section .vectors,"ax" |
| .long __start |
| .long __start |
| vector = 2 |
| .rept 126-1 |
| .long _interrupt_redirect_table+vector*4 |
| vector = vector + 1 |
| .endr |
