LXR linux/arch/sparc/prom/console

   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
  16static 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
  37void 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}
  47