112 lines
1.7 KiB
ArmAsm
Executable file
112 lines
1.7 KiB
ArmAsm
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#include <linux/init.h>
|
|
#include <asm/thread_info.h>
|
|
|
|
#if defined(CONFIG_CPU_H8300H)
|
|
.h8300h
|
|
#define SYSCR 0xfee012
|
|
#define IRAMTOP 0xffff20
|
|
#define NR_INT 64
|
|
#endif
|
|
#if defined(CONFIG_CPU_H8S)
|
|
.h8300s
|
|
#define INTCR 0xffff31
|
|
#define IRAMTOP 0xffc000
|
|
#define NR_INT 128
|
|
#endif
|
|
|
|
__HEAD
|
|
.global _start
|
|
_start:
|
|
mov.l #IRAMTOP,sp
|
|
#if !defined(CONFIG_H8300H_SIM) && \
|
|
!defined(CONFIG_H8S_SIM)
|
|
jsr @lowlevel_init
|
|
|
|
/* 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
|
|
/* .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
|
|
#else
|
|
/* get cmdline from gdb */
|
|
jsr @0xcc
|
|
;; er0 - argc
|
|
;; er1 - argv
|
|
mov.l #command_line,er3
|
|
adds #4,er1
|
|
dec.l #1,er0
|
|
beq 4f
|
|
1:
|
|
mov.l @er1+,er2
|
|
2:
|
|
mov.b @er2+,r4l
|
|
beq 3f
|
|
mov.b r4l,@er3
|
|
adds #1,er3
|
|
bra 2b
|
|
3:
|
|
mov.b #' ',r4l
|
|
mov.b r4l,@er3
|
|
adds #1,er3
|
|
dec.l #1,er0
|
|
bne 1b
|
|
subs #1,er3
|
|
mov.b #0,r4l
|
|
mov.b r4l,@er3
|
|
4:
|
|
#endif
|
|
sub.l er0,er0
|
|
jsr @h8300_fdt_init
|
|
/* linux kernel start */
|
|
#if defined(CONFIG_CPU_H8300H)
|
|
ldc #0xd0,ccr /* running kernel */
|
|
mov.l #SYSCR,er0
|
|
bclr #3,@er0
|
|
#endif
|
|
#if defined(CONFIG_CPU_H8S)
|
|
ldc #0x07,exr
|
|
bclr #4,@INTCR:8
|
|
bset #5,@INTCR:8 /* Interrupt mode 2 */
|
|
ldc #0x90,ccr /* running kernel */
|
|
#endif
|
|
mov.l #init_thread_union,sp
|
|
add.l #0x2000,sp
|
|
jsr @start_kernel
|
|
|
|
1:
|
|
bra 1b
|
|
|
|
#if defined(CONFIG_ROMKERNEL)
|
|
/* interrupt vector */
|
|
.section .vectors,"ax"
|
|
.long _start
|
|
.long _start
|
|
vector = 2
|
|
.rept NR_INT - 2
|
|
.long _interrupt_redirect_table+vector*4
|
|
vector = vector + 1
|
|
.endr
|
|
#endif
|
|
.end
|