/*
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* arch/h8300/kernel/sim-console.c
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*
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* Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/serial_core.h>
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static void sim_write(struct console *con, const char *s, unsigned n)
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{
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register const char *_ptr __asm__("er1") = s;
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register const unsigned _len __asm__("er2") = n;
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__asm__("sub.l er0,er0\n\t" /* er0 = 1 (stdout) */
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"inc.l #1,er0\n\t"
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".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */
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: : "g"(_ptr), "g"(_len):"er0");
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}
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static int __init sim_setup(struct earlycon_device *device, const char *opt)
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{
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device->con->write = sim_write;
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return 0;
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}
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EARLYCON_DECLARE(h8sim, sim_setup);
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