Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
88278ca2 | 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 | */ | |
7 | ||
8 | #include <linux/string.h> | |
9 | #include <asm/oplib.h> | |
1da177e4 LT |
10 | #include <linux/init.h> |
11 | ||
12 | #define BARG_LEN 256 | |
13 | static char barg_buf[BARG_LEN] = { 0 }; | |
14 | static char fetched __initdata = 0; | |
15 | ||
1da177e4 LT |
16 | char * __init |
17 | prom_getbootargs(void) | |
18 | { | |
19 | int iter; | |
20 | char *cp, *arg; | |
21 | ||
22 | /* This check saves us from a panic when bootfd patches args. */ | |
23 | if (fetched) { | |
24 | return barg_buf; | |
25 | } | |
26 | ||
242ece22 | 27 | switch (prom_vers) { |
1da177e4 | 28 | case PROM_V0: |
1da177e4 LT |
29 | cp = barg_buf; |
30 | /* Start from 1 and go over fd(0,0,0)kernel */ | |
242ece22 | 31 | for (iter = 1; iter < 8; iter++) { |
1da177e4 | 32 | arg = (*(romvec->pv_v0bootargs))->argv[iter]; |
5f66dd35 SR |
33 | if (arg == NULL) |
34 | break; | |
242ece22 | 35 | while (*arg != 0) { |
1da177e4 | 36 | /* Leave place for space and null. */ |
242ece22 | 37 | if (cp >= barg_buf + BARG_LEN - 2) |
1da177e4 LT |
38 | /* We might issue a warning here. */ |
39 | break; | |
1da177e4 LT |
40 | *cp++ = *arg++; |
41 | } | |
42 | *cp++ = ' '; | |
242ece22 CG |
43 | if (cp >= barg_buf + BARG_LEN - 1) |
44 | /* We might issue a warning here. */ | |
45 | break; | |
1da177e4 LT |
46 | } |
47 | *cp = 0; | |
48 | break; | |
49 | case PROM_V2: | |
50 | case PROM_V3: | |
51 | /* | |
52 | * V3 PROM cannot supply as with more than 128 bytes | |
53 | * of an argument. But a smart bootstrap loader can. | |
54 | */ | |
55 | strlcpy(barg_buf, *romvec->pv_v2bootargs.bootargs, sizeof(barg_buf)); | |
56 | break; | |
57 | default: | |
58 | break; | |
59 | } | |
60 | ||
61 | fetched = 1; | |
62 | return barg_buf; | |
63 | } |