arch/sparc/prom/console_64.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* console.c: Routines that deal with sending and receiving IO
   3  *            to/from the current console device using the PROM.
   4  *
   5  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
   6  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <asm/openprom.h>
  13 #include <asm/oplib.h>
  14 #include <linux/string.h>
  15
  16 static int __prom_console_write_buf(const char *buf, int len)
  17 {
  18         unsigned long args[7];
  19         int ret;
  20
  21         args[0] = (unsigned long) "write";
  22         args[1] = 3;
  23         args[2] = 1;
  24         args[3] = (unsigned int) prom_stdout;
  25         args[4] = (unsigned long) buf;
  26         args[5] = (unsigned int) len;
  27         args[6] = (unsigned long) -1;
  28
  29         p1275_cmd_direct(args);
  30
  31         ret = (int) args[6];
  32         if (ret < 0)
  33                 return -1;
  34         return ret;
  35 }
  36
  37 void prom_console_write_buf(const char *buf, int len)
  38 {
  39         while (len) {
  40                 int n = __prom_console_write_buf(buf, len);
  41                 if (n < 0)
  42                         continue;
  43                 len -= n;
  44                 buf += len;
  45         }
  46 }