projects / deliverable / linux.git / blame
| 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 | } |