Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1996 David S. Miller (dm@sgi.com) |
| 7 | * Compability with board caches, Ulf Carlsson |
| 8 | */ |
| 9 | #include <linux/kernel.h> |
| 10 | #include <asm/sgialib.h> |
| 11 | #include <asm/bcache.h> |
| 12 | |
| 13 | /* |
| 14 | * IP22 boardcache is not compatible with board caches. Thus we disable it |
| 15 | * during romvec action. Since r4xx0.c is always compiled and linked with your |
| 16 | * kernel, this shouldn't cause any harm regardless what MIPS processor you |
| 17 | * have. |
| 18 | * |
| 19 | * The ARC write and read functions seem to interfere with the serial lines |
| 20 | * in some way. You should be careful with them. |
| 21 | */ |
| 22 | |
| 23 | void prom_putchar(char c) |
| 24 | { |
| 25 | ULONG cnt; |
| 26 | CHAR it = c; |
| 27 | |
| 28 | bc_disable(); |
| 29 | ArcWrite(1, &it, 1, &cnt); |
| 30 | bc_enable(); |
| 31 | } |
| 32 | |
| 33 | char prom_getchar(void) |
| 34 | { |
| 35 | ULONG cnt; |
| 36 | CHAR c; |
| 37 | |
| 38 | bc_disable(); |
| 39 | ArcRead(0, &c, 1, &cnt); |
| 40 | bc_enable(); |
| 41 | |
| 42 | return c; |
| 43 | } |