[mirror_ubuntu-eoan-kernel.git] / arch / s390 / kernel / early_printk.c

// SPDX-License-Identifier: GPL-2.0
/*
 *    Copyright IBM Corp. 2017
 */

#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/sclp.h>

static void sclp_early_write(struct console *con, const char *s, unsigned int len)
{
	__sclp_early_printk(s, len, 0);
}

static struct console sclp_early_console = {
	.name  = "earlysclp",
	.write = sclp_early_write,
	.flags = CON_PRINTBUFFER | CON_BOOT,
	.index = -1,
};

static int __init setup_early_printk(char *buf)
{
	if (early_console)
		return 0;
	/* Accept only "earlyprintk" and "earlyprintk=sclp" */
	if (buf && strncmp(buf, "sclp", 4))
		return 0;
	if (!sclp.has_linemode && !sclp.has_vt220)
		return 0;
	early_console = &sclp_early_console;
	register_console(early_console);
	return 0;
}
early_param("earlyprintk", setup_early_printk);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
89175cf7 HC	2	/*
	3	* Copyright IBM Corp. 2017
	4	*/
	5
	6	#include <linux/console.h>
	7	#include <linux/kernel.h>
	8	#include <linux/init.h>
	9	#include <asm/sclp.h>
	10
	11	static void sclp_early_write(struct console con, const char s, unsigned int len)
	12	{
55a5542a	13	__sclp_early_printk(s, len, 0);
89175cf7 HC	14	}
	15
	16	static struct console sclp_early_console = {
	17	.name = "earlysclp",
	18	.write = sclp_early_write,
	19	.flags = CON_PRINTBUFFER \| CON_BOOT,
	20	.index = -1,
	21	};
	22
	23	static int __init setup_early_printk(char *buf)
	24	{
	25	if (early_console)
	26	return 0;
	27	/* Accept only "earlyprintk" and "earlyprintk=sclp" */
	28	if (buf && strncmp(buf, "sclp", 4))
	29	return 0;
	30	if (!sclp.has_linemode && !sclp.has_vt220)
	31	return 0;
	32	early_console = &sclp_early_console;
	33	register_console(early_console);
	34	return 0;
	35	}
	36	early_param("earlyprintk", setup_early_printk);