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1da177e4 LT |
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 | |
bff06d55 | 70 | prom_puts(const char *s, int len) |
1da177e4 LT |
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 | } |