Commit | Line | Data |
---|---|---|
d979f179 | 1 | /* console.c: Routines that deal with sending and receiving IO |
1da177e4 LT |
2 | * to/from the current console device using the PROM. |
3 | * | |
d979f179 | 4 | * Copyright (C) 1995 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
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 | */ | |
d979f179 | 21 | inline int |
1da177e4 LT |
22 | prom_nbgetchar(void) |
23 | { | |
24 | char inc; | |
25 | ||
26 | if (p1275_cmd("read", P1275_ARG(1,P1275_ARG_OUT_BUF)| | |
27 | P1275_INOUT(3,1), | |
28 | prom_stdin, &inc, P1275_SIZE(1)) == 1) | |
29 | return inc; | |
30 | else | |
31 | return -1; | |
32 | } | |
33 | ||
34 | /* Non blocking put character to console device, returns -1 if | |
35 | * unsuccessful. | |
36 | */ | |
d979f179 | 37 | inline int |
1da177e4 LT |
38 | prom_nbputchar(char c) |
39 | { | |
40 | char outc; | |
41 | ||
42 | outc = c; | |
43 | if (p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)| | |
44 | P1275_INOUT(3,1), | |
45 | prom_stdout, &outc, P1275_SIZE(1)) == 1) | |
46 | return 0; | |
47 | else | |
48 | return -1; | |
49 | } | |
50 | ||
51 | /* Blocking version of get character routine above. */ | |
52 | char | |
53 | prom_getchar(void) | |
54 | { | |
55 | int character; | |
56 | while((character = prom_nbgetchar()) == -1) ; | |
57 | return (char) character; | |
58 | } | |
59 | ||
60 | /* Blocking version of put character routine above. */ | |
61 | void | |
62 | prom_putchar(char c) | |
63 | { | |
64 | prom_nbputchar(c); | |
1da177e4 LT |
65 | } |
66 | ||
67 | void | |
bff06d55 | 68 | prom_puts(const char *s, int len) |
1da177e4 LT |
69 | { |
70 | p1275_cmd("write", P1275_ARG(1,P1275_ARG_IN_BUF)| | |
71 | P1275_INOUT(3,1), | |
72 | prom_stdout, s, P1275_SIZE(len)); | |
73 | } |