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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright IBM Corp. 2017
*/
#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/setup.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,
};
void __init register_early_console(void)
{
if (early_console)
return;
if (!sclp.has_linemode && !sclp.has_vt220)
return;
early_console = &sclp_early_console;
register_console(early_console);
}
static int __init setup_early_printk(char *buf)
{
if (early_console)
return 0;
/* Accept only "earlyprintk" and "earlyprintk=sclp" */
if (buf && !str_has_prefix(buf, "sclp"))
return 0;
register_early_console();
return 0;
}
early_param("earlyprintk", setup_early_printk);
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