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/*
* 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);
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