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| /* 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
|
|
