diff options
Diffstat (limited to 'arch/h8300/kernel/head_ram.S')
| -rw-r--r-- | arch/h8300/kernel/head_ram.S | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/h8300/kernel/head_ram.S b/arch/h8300/kernel/head_ram.S new file mode 100644 index 000000000000..84ac5c3ed31a --- /dev/null +++ b/arch/h8300/kernel/head_ram.S @@ -0,0 +1,60 @@ + +#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 |