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Linux/arch/s390/kernel/early_printk.c

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  1 // SPDX-License-Identifier: GPL-2.0
  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 {
 13         __sclp_early_printk(s, len);
 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);
 37 

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