blob: ab9ccc63b3880f5de18eb427869574b872a1ceb2 [file] [log] [blame]
Adrian Bunkb00dc832008-05-19 16:52:27 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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
18struct {
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
30char * __init
31prom_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}