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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b00dc837 | 2 | /* |
1da177e4 LT |
3 | * bootstr.c: Boot string/argument acquisition from the PROM. |
4 | * | |
5 | * Copyright(C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
6 | * Copyright(C) 1996,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
7 | */ | |
8 | ||
9 | #include <linux/string.h> | |
10 | #include <linux/init.h> | |
11 | #include <asm/oplib.h> | |
12 | ||
13 | /* WARNING: The boot loader knows that these next three variables come one right | |
14 | * after another in the .data section. Do not move this stuff into | |
15 | * the .bss section or it will break things. | |
16 | */ | |
17 | ||
1cef94c3 DK |
18 | /* We limit BARG_LEN to 1024 because this is the size of the |
19 | * 'barg_out' command line buffer in the SILO bootloader. | |
20 | */ | |
21 | #define BARG_LEN 1024 | |
1da177e4 LT |
22 | struct { |
23 | int bootstr_len; | |
24 | int bootstr_valid; | |
25 | char bootstr_buf[BARG_LEN]; | |
26 | } bootstr_info = { | |
27 | .bootstr_len = BARG_LEN, | |
28 | #ifdef CONFIG_CMDLINE | |
29 | .bootstr_valid = 1, | |
30 | .bootstr_buf = CONFIG_CMDLINE, | |
31 | #endif | |
32 | }; | |
33 | ||
34 | char * __init | |
35 | prom_getbootargs(void) | |
36 | { | |
37 | /* This check saves us from a panic when bootfd patches args. */ | |
38 | if (bootstr_info.bootstr_valid) | |
39 | return bootstr_info.bootstr_buf; | |
40 | prom_getstring(prom_chosen_node, "bootargs", | |
41 | bootstr_info.bootstr_buf, BARG_LEN); | |
42 | bootstr_info.bootstr_valid = 1; | |
43 | return bootstr_info.bootstr_buf; | |
44 | } |