1/*
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/* We limit BARG_LEN to 1024 because this is the size of the
18 * 'barg_out' command line buffer in the SILO bootloader.
19 */
20#define BARG_LEN 1024
21struct {
22	int bootstr_len;
23	int bootstr_valid;
24	char bootstr_buf[BARG_LEN];
25} bootstr_info = {
26	.bootstr_len = BARG_LEN,
27#ifdef CONFIG_CMDLINE
28	.bootstr_valid = 1,
29	.bootstr_buf = CONFIG_CMDLINE,
30#endif
31};
32
33char * __init
34prom_getbootargs(void)
35{
36	/* This check saves us from a panic when bootfd patches args. */
37	if (bootstr_info.bootstr_valid)
38		return bootstr_info.bootstr_buf;
39	prom_getstring(prom_chosen_node, "bootargs",
40		       bootstr_info.bootstr_buf, BARG_LEN);
41	bootstr_info.bootstr_valid = 1;
42	return bootstr_info.bootstr_buf;
43}
44