36 lines
785 B
C
36 lines
785 B
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);
|