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 /* Non blocking get character from console input device, returns -1
  19  * if no input was taken.  This can be used for polling.
  20  */
  21 inline int
  22 prom_nbgetchar(void)
  23 {
  24         unsigned long args[7];
  25         char inc;
  26
  27         args[0] = (unsigned long) "read";
  28         args[1] = 3;
  29         args[2] = 1;
  30         args[3] = (unsigned int) prom_stdin;
  31         args[4] = (unsigned long) &inc;
  32         args[5] = 1;
  33         args[6] = (unsigned long) -1;
  34
  35         p1275_cmd_direct(args);
  36
  37         if (args[6] == 1)
  38                 return inc;
  39         return -1;
  40 }
  41
  42 /* Non blocking put character to console device, returns -1 if
  43  * unsuccessful.
  44  */
  45 inline int
  46 prom_nbputchar(char c)
  47 {
  48         unsigned long args[7];
  49         char outc;
  50
  51         outc = c;
  52
  53         args[0] = (unsigned long) "write";
  54         args[1] = 3;
  55         args[2] = 1;
  56         args[3] = (unsigned int) prom_stdout;
  57         args[4] = (unsigned long) &outc;
  58         args[5] = 1;
  59         args[6] = (unsigned long) -1;
  60
  61         p1275_cmd_direct(args);
  62
  63         if (args[6] == 1)
  64                 return 0;
  65         else
  66                 return -1;
  67 }
  68
  69 /* Blocking version of get character routine above. */
  70 char
  71 prom_getchar(void)
  72 {
  73         int character;
  74         while((character = prom_nbgetchar()) == -1) ;
  75         return (char) character;
  76 }
  77
  78 /* Blocking version of put character routine above. */
  79 void
  80 prom_putchar(char c)
  81 {
  82         prom_nbputchar(c);
  83         return;
  84 }
  85
  86 void
  87 prom_puts(const char *s, int len)
  88 {
  89         unsigned long args[7];
  90
  91         args[0] = (unsigned long) "write";
  92         args[1] = 3;
  93         args[2] = 1;
  94         args[3] = (unsigned int) prom_stdout;
  95         args[4] = (unsigned long) s;
  96         args[5] = len;
  97         args[6] = (unsigned long) -1;
  98
  99         p1275_cmd_direct(args);
 100 }