diff options
| author | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-05-11 02:32:13 +0900 |
|---|---|---|
| committer | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-06-23 13:35:51 +0900 |
| commit | df2078b8daa7bb15cc8e3f791389b9f44e12bb25 (patch) | |
| tree | 773e538c2f7e3470ae7e3853854c7bede57e5a27 /arch/h8300/kernel/head_rom.S | |
| parent | d8b0bdb444ed0e2bd5f9d3ea7412cb90bdec58cf (diff) | |
| download | linux-next-df2078b8daa7bb15cc8e3f791389b9f44e12bb25.tar.gz | |
h8300: Low level entry
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Diffstat (limited to 'arch/h8300/kernel/head_rom.S')
| -rw-r--r-- | arch/h8300/kernel/head_rom.S | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/arch/h8300/kernel/head_rom.S b/arch/h8300/kernel/head_rom.S new file mode 100644 index 000000000000..9868a4121a1f --- /dev/null +++ b/arch/h8300/kernel/head_rom.S @@ -0,0 +1,110 @@ +#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 |