mirror of https://gitee.com/openkylin/linux.git
123 lines
1.9 KiB
ArmAsm
123 lines
1.9 KiB
ArmAsm
/*
|
|
* linux/arch/h8300/platform/h8300h/generic/crt0_rom.S
|
|
*
|
|
* Yoshinori Sato <ysato@users.sourceforge.jp>
|
|
*
|
|
* Platform depend startup
|
|
* Target Archtecture: generic
|
|
* Memory Layout : ROM
|
|
*/
|
|
|
|
#define ASSEMBLY
|
|
|
|
#include <asm/linkage.h>
|
|
|
|
.global SYMBOL_NAME(_start)
|
|
.global SYMBOL_NAME(_command_line)
|
|
.global SYMBOL_NAME(_platform_gpio_table)
|
|
.global SYMBOL_NAME(_target_name)
|
|
|
|
.h8300h
|
|
.section .text
|
|
.file "crt0_rom.S"
|
|
|
|
/* CPU Reset entry */
|
|
SYMBOL_NAME_LABEL(_start)
|
|
mov.l #__ramend,sp
|
|
ldc #0x80,ccr
|
|
|
|
/* Peripheral Setup */
|
|
|
|
/* .bss clear */
|
|
mov.l #__sbss,er5
|
|
mov.l #__ebss,er4
|
|
sub.l er5,er4
|
|
shlr er4
|
|
shlr er4
|
|
sub.l er0,er0
|
|
1:
|
|
mov.l er0,@er5
|
|
adds #4,er5
|
|
dec.l #1,er4
|
|
bne 1b
|
|
|
|
/* copy .data */
|
|
#if !defined(CONFIG_H8300H_SIM)
|
|
/* copy .data */
|
|
mov.l #__begin_data,er5
|
|
mov.l #__sdata,er6
|
|
mov.l #__edata,er4
|
|
sub.l er6,er4
|
|
shlr.l er4
|
|
shlr.l er4
|
|
1:
|
|
mov.l @er5+,er0
|
|
mov.l er0,@er6
|
|
adds #4,er6
|
|
dec.l #1,er4
|
|
bne 1b
|
|
#endif
|
|
|
|
/* copy kernel commandline */
|
|
mov.l #COMMAND_START,er5
|
|
mov.l #SYMBOL_NAME(_command_line),er6
|
|
mov.w #512,r4
|
|
eepmov.w
|
|
|
|
/* 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
|
|
;; P9DDR
|
|
.byte 0x00,0x00
|
|
;; PADDR
|
|
.byte 0x00,0x00
|
|
;; PBDDR
|
|
.byte 0x00,0x00
|
|
|
|
.section .rodata
|
|
__target_name:
|
|
.asciz "generic"
|
|
|
|
.section .bss
|
|
__command_line:
|
|
.space 512
|
|
|
|
/* interrupt vector */
|
|
.section .vectors,"ax"
|
|
.long __start
|
|
vector = 1
|
|
.rept 64-1
|
|
.long _interrupt_redirect_table+vector*4
|
|
vector = vector + 1
|
|
.endr
|