arch/mips/dec/prom/console.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      DECstation PROM-based early console support.
   4  *
   5  *      Copyright (C) 2004, 2007  Maciej W. Rozycki
   6  */
   7 #include <linux/console.h>
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/string.h>
  11
  12 #include <asm/dec/prom.h>
  13
  14 static void __init prom_console_write(struct console *con, const char *s,
  15                                       unsigned int c)
  16 {
  17         char buf[81];
  18         unsigned int chunk = sizeof(buf) - 1;
  19
  20         while (c > 0) {
  21                 if (chunk > c)
  22                         chunk = c;
  23                 memcpy(buf, s, chunk);
  24                 buf[chunk] = '\0';
  25                 prom_printf("%s", buf);
  26                 s += chunk;
  27                 c -= chunk;
  28         }
  29 }
  30
  31 static struct console promcons __initdata = {
  32         .name   = "prom",
  33         .write  = prom_console_write,
  34         .flags  = CON_BOOT | CON_PRINTBUFFER,
  35         .index  = -1,
  36 };
  37
  38 void __init register_prom_console(void)
  39 {
  40         register_console(&promcons);
  41 }