release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sparc/prom/console_64.c

   1 /* console.c: Routines that deal with sending and receiving IO
   2  *            to/from the current console device using the PROM.
   3  *
   4  * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
   5  * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  */
   7
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/sched.h>
  11 #include <asm/openprom.h>
  12 #include <asm/oplib.h>
  13 #include <asm/system.h>
  14 #include <linux/string.h>
  15
  16 extern int prom_stdin, prom_stdout;
  17
  18 static int __prom_console_write_buf(const char *buf, int len)
  19 {
  20         unsigned long args[7];
  21         int ret;
  22
  23         args[0] = (unsigned long) "write";
  24         args[1] = 3;
  25         args[2] = 1;
  26         args[3] = (unsigned int) prom_stdout;
  27         args[4] = (unsigned long) buf;
  28         args[5] = (unsigned int) len;
  29         args[6] = (unsigned long) -1;
  30
  31         p1275_cmd_direct(args);
  32
  33         ret = (int) args[6];
  34         if (ret < 0)
  35                 return -1;
  36         return ret;
  37 }
  38
  39 void prom_console_write_buf(const char *buf, int len)
  40 {
  41         while (len) {
  42                 int n = __prom_console_write_buf(buf, len);
  43                 if (n < 0)
  44                         continue;
  45                 len -= n;
  46                 buf += len;
  47         }
  48 }