Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * DECstation PROM-based early console support. |
| 3 | * |
Maciej W. Rozycki | 36de48d | 2007-06-05 11:45:07 +0100 | [diff] [blame] | 4 | * Copyright (C) 2004, 2007 Maciej W. Rozycki |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | #include <linux/console.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/kernel.h> |
Maciej W. Rozycki | 36de48d | 2007-06-05 11:45:07 +0100 | [diff] [blame] | 14 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
| 16 | #include <asm/dec/prom.h> |
| 17 | |
Maciej W. Rozycki | 36de48d | 2007-06-05 11:45:07 +0100 | [diff] [blame] | 18 | static void __init prom_console_write(struct console *con, const char *s, |
| 19 | unsigned int c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | { |
Maciej W. Rozycki | 36de48d | 2007-06-05 11:45:07 +0100 | [diff] [blame] | 21 | char buf[81]; |
| 22 | unsigned int chunk = sizeof(buf) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Maciej W. Rozycki | 36de48d | 2007-06-05 11:45:07 +0100 | [diff] [blame] | 24 | while (c > 0) { |
| 25 | if (chunk > c) |
| 26 | chunk = c; |
| 27 | memcpy(buf, s, chunk); |
| 28 | buf[chunk] = '\0'; |
| 29 | prom_printf("%s", buf); |
| 30 | s += chunk; |
| 31 | c -= chunk; |
| 32 | } |
| 33 | } |
Ralf Baechle | 36a8853 | 2007-03-01 11:56:43 +0000 | [diff] [blame] | 34 | |
Maciej W. Rozycki | 36de48d | 2007-06-05 11:45:07 +0100 | [diff] [blame] | 35 | static struct console promcons __initdata = { |
| 36 | .name = "prom", |
| 37 | .write = prom_console_write, |
| 38 | .flags = CON_BOOT | CON_PRINTBUFFER, |
| 39 | .index = -1, |
| 40 | }; |
| 41 | |
| 42 | void __init register_prom_console(void) |
| 43 | { |
| 44 | register_console(&promcons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | } |