| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: bootstr.c,v 1.6 1999/08/31 06:55:01 davem Exp $ |
| 2 | * bootstr.c: Boot string/argument acquisition from the PROM. |
| 3 | * |
| 4 | * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| 5 | * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| 6 | */ |
| 7 | |
| 8 | #include <linux/string.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <asm/oplib.h> |
| 11 | |
| 12 | /* WARNING: The boot loader knows that these next three variables come one right |
| 13 | * after another in the .data section. Do not move this stuff into |
| 14 | * the .bss section or it will break things. |
| 15 | */ |
| 16 | |
| 17 | #define BARG_LEN 256 |
| 18 | struct { |
| 19 | int bootstr_len; |
| 20 | int bootstr_valid; |
| 21 | char bootstr_buf[BARG_LEN]; |
| 22 | } bootstr_info = { |
| 23 | .bootstr_len = BARG_LEN, |
| 24 | #ifdef CONFIG_CMDLINE |
| 25 | .bootstr_valid = 1, |
| 26 | .bootstr_buf = CONFIG_CMDLINE, |
| 27 | #endif |
| 28 | }; |
| 29 | |
| 30 | char * __init |
| 31 | prom_getbootargs(void) |
| 32 | { |
| 33 | /* This check saves us from a panic when bootfd patches args. */ |
| 34 | if (bootstr_info.bootstr_valid) |
| 35 | return bootstr_info.bootstr_buf; |
| 36 | prom_getstring(prom_chosen_node, "bootargs", |
| 37 | bootstr_info.bootstr_buf, BARG_LEN); |
| 38 | bootstr_info.bootstr_valid = 1; |
| 39 | return bootstr_info.bootstr_buf; |
| 40 | } |