diff options
Diffstat (limited to 'arch/h8300/kernel/sim-console.c')
| -rw-r--r-- | arch/h8300/kernel/sim-console.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/h8300/kernel/sim-console.c b/arch/h8300/kernel/sim-console.c new file mode 100644 index 000000000..03aa35b1a --- /dev/null +++ b/arch/h8300/kernel/sim-console.c @@ -0,0 +1,31 @@ +/* + * arch/h8300/kernel/sim-console.c + * + * Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ +#include <linux/console.h> +#include <linux/init.h> +#include <linux/serial_core.h> + +static void sim_write(struct console *con, const char *s, unsigned n) +{ + register const char *_ptr __asm__("er1") = s; + register const unsigned _len __asm__("er2") = n; + + __asm__("sub.l er0,er0\n\t" /* er0 = 1 (stdout) */ + "inc.l #1,er0\n\t" + ".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */ + : : "g"(_ptr), "g"(_len):"er0"); +} + +static int __init sim_setup(struct earlycon_device *device, const char *opt) +{ + device->con->write = sim_write; + return 0; +} + +EARLYCON_DECLARE(h8sim, sim_setup); |