arch/sparc64/prom/console.c

   1 /* $Id: console.c,v 1.9 1997/10/29 07:41:43 ecd Exp $
   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@caip.rutgers.edu)
   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 <asm/system.h>
  15 #include <linux/string.h>
  16
  17 extern int prom_stdin, prom_stdout;
  18
  19 /* Non blocking get character from console input device, returns -1
  20  * if no input was taken.  This can be used for polling.
  21  */
  22 __inline__ int
  23 prom_nbgetchar(void)
  24 {
  25         char inc;
  26
  27         if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)|
  28                               P1275_INOUT(3,1),
  29                               prom_stdin, &inc, P1275_SIZE(1)) == 1)
  30                 return inc;
  31         else
  32                 return -1;
  33 }
  34
  35 /* Non blocking put character to console device, returns -1 if
  36  * unsuccessful.
  37  */
  38 __inline__ int
  39 prom_nbputchar(char c)
  40 {
  41         char outc;
  42
  43         outc = c;
  44         if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
  45                                P1275_INOUT(3,1),
  46                                prom_stdout, &outc, P1275_SIZE(1)) == 1)
  47                 return 0;
  48         else
  49                 return -1;
  50 }
  51
  52 /* Blocking version of get character routine above. */
  53 char
  54 prom_getchar(void)
  55 {
  56         int character;
  57         while((character = prom_nbgetchar()) == -1) ;
  58         return (char) character;
  59 }
  60
  61 /* Blocking version of put character routine above. */
  62 void
  63 prom_putchar(char c)
  64 {
  65         prom_nbputchar(c);
  66         return;
  67 }
  68
  69 void
  70 prom_puts(const char *s, int len)
  71 {
  72         p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)|
  73                            P1275_INOUT(3,1),
  74                            prom_stdout, s, P1275_SIZE(len));
  75 }