| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #include <linux/sys.h> |
| #include <linux/init.h> |
| #include <asm/unistd.h> |
| #include <asm/setup.h> |
| #include <asm/segment.h> |
| #include <asm/linkage.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/thread_info.h> |
| #include <asm/errno.h> |
| |
| #if defined(CONFIG_CPU_H8300H) |
| .h8300h |
| #define SYSCR 0xfee012 |
| #define IRAMTOP 0xffff20 |
| #endif |
| #if defined(CONFIG_CPU_H8S) |
| .h8300s |
| #define INTCR 0xffff31 |
| #define IRAMTOP 0xffc000 |
| #endif |
| |
| __HEAD |
| .global _start |
| _start: |
| mov.l #IRAMTOP,sp |
| /* .bss clear */ |
| mov.l #_sbss,er5 |
| mov.l #_ebss,er4 |
| sub.l er5,er4 |
| shlr er4 |
| shlr er4 |
| sub.l er2,er2 |
| 1: |
| mov.l er2,@er5 |
| adds #4,er5 |
| dec.l #1,er4 |
| bne 1b |
| 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 |
| |
| .end |
