mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 01:10:04 +00:00
811d1b0e65
Since gcc 8.1 does not generate an assignment statement to er 0, we had to explicitly write it. Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
31 lines
877 B
C
31 lines
877 B
C
/*
|
|
* 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);
|