1/*
 2 * arch/h8300/kernel/sim-console.c
 3 *
 4 *  Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
 5 *
 6 * This file is subject to the terms and conditions of the GNU General Public
 7 * License.  See the file "COPYING" in the main directory of this archive
 8 * for more details.
 9 */
10#include <linux/console.h>
11#include <linux/init.h>
12#include <linux/serial_core.h>
13
14static void sim_write(struct console *con, const char *s, unsigned n)
15{
16	register const int fd __asm__("er0") = 1; /* stdout */
17	register const char *_ptr __asm__("er1") = s;
18	register const unsigned _len __asm__("er2") = n;
19
20	__asm__(".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */
21		: : "g"(fd), "g"(_ptr), "g"(_len));
22}
23
24static int __init sim_setup(struct earlycon_device *device, const char *opt)
25{
26	device->con->write = sim_write;
27	return 0;
28}
29
30EARLYCON_DECLARE(h8sim, sim_setup);

 1/*
 2 * arch/h8300/kernel/sim-console.c
 3 *
 4 *  Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
 5 *
 6 * This file is subject to the terms and conditions of the GNU General Public
 7 * License.  See the file "COPYING" in the main directory of this archive
 8 * for more details.
 9 */
10#include <linux/console.h>
11#include <linux/init.h>
12#include <linux/serial_core.h>
13
14static void sim_write(struct console *con, const char *s, unsigned n)
15{
16	register const int fd __asm__("er0") = 1; /* stdout */
17	register const char *_ptr __asm__("er1") = s;
18	register const unsigned _len __asm__("er2") = n;
19
20	__asm__(".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */
21		: : "g"(fd), "g"(_ptr), "g"(_len));
22}
23
24static int __init sim_setup(struct earlycon_device *device, const char *opt)
25{
26	device->con->write = sim_write;
27	return 0;
28}
29
30EARLYCON_DECLARE(h8sim, sim_setup);