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

/*
 *    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);
}

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
89175cf7 HC	1	/*
	2	* Copyright IBM Corp. 2017
	3	*/
	4
	5	#include <linux/console.h>
	6	#include <linux/kernel.h>
	7	#include <linux/init.h>
	8	#include <asm/sclp.h>
	9
	10	static void sclp_early_write(struct console con, const char s, unsigned int len)
	11	{
d5ab7a34	12	__sclp_early_printk(s, len);
89175cf7 HC	13	}
	14
	15	static struct console sclp_early_console = {
	16	.name = "earlysclp",
	17	.write = sclp_early_write,
	18	.flags = CON_PRINTBUFFER \| CON_BOOT,
	19	.index = -1,
	20	};
	21
	22	static int __init setup_early_printk(char *buf)
	23	{
	24	if (early_console)
	25	return 0;
	26	/* Accept only "earlyprintk" and "earlyprintk=sclp" */
	27	if (buf && strncmp(buf, "sclp", 4))
	28	return 0;
	29	if (!sclp.has_linemode && !sclp.has_vt220)
	30	return 0;
	31	early_console = &sclp_early_console;
	32	register_console(early_console);
	33	return 0;
	34	}
	35	early_param("earlyprintk", setup_early_printk);