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Commit | Line | Data |
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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 | { | |
25edd694 | 24 | unsigned long args[7]; |
1da177e4 LT |
25 | char inc; |
26 | ||
25edd694 DM |
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) | |
1da177e4 | 38 | return inc; |
25edd694 | 39 | return -1; |
1da177e4 LT |
40 | } |
41 | ||
42 | /* Non blocking put character to console device, returns -1 if | |
43 | * unsuccessful. | |
44 | */ | |
d979f179 | 45 | inline int |
1da177e4 LT |
46 | prom_nbputchar(char c) |
47 | { | |
25edd694 | 48 | unsigned long args[7]; |
1da177e4 LT |
49 | char outc; |
50 | ||
51 | outc = c; | |
25edd694 DM |
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) | |
1da177e4 LT |
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); | |
1da177e4 LT |
83 | } |
84 | ||
85 | void | |
bff06d55 | 86 | prom_puts(const char *s, int len) |
1da177e4 | 87 | { |
25edd694 DM |
88 | unsigned long args[7]; |
89 | ||
90 | args[0] = (unsigned long) "write"; | |
91 | args[1] = 3; | |
92 | args[2] = 1; | |
93 | args[3] = (unsigned int) prom_stdout; | |
94 | args[4] = (unsigned long) s; | |
95 | args[5] = len; | |
96 | args[6] = (unsigned long) -1; | |
97 | ||
98 | p1275_cmd_direct(args); | |
1da177e4 | 99 | } |