projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 88278ca2 | 1 | /* |
| 1da177e4 LT |
2 | * bootstr.c: Boot string/argument acquisition from the PROM. |
| 3 | * | |
| 4 | * Copyright(C) 1995 David S. Miller ([email protected]) | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/string.h> | |
| 8 | #include <asm/oplib.h> | |
| 1da177e4 LT |
9 | #include <linux/init.h> |
| 10 | ||
| 11 | #define BARG_LEN 256 | |
| 12 | static char barg_buf[BARG_LEN] = { 0 }; | |
| 13 | static char fetched __initdata = 0; | |
| 14 | ||
| 1da177e4 LT |
15 | char * __init |
| 16 | prom_getbootargs(void) | |
| 17 | { | |
| 18 | int iter; | |
| 19 | char *cp, *arg; | |
| 20 | ||
| 21 | /* This check saves us from a panic when bootfd patches args. */ | |
| 22 | if (fetched) { | |
| 23 | return barg_buf; | |
| 24 | } | |
| 25 | ||
| 26 | switch(prom_vers) { | |
| 27 | case PROM_V0: | |
| 1da177e4 LT |
28 | cp = barg_buf; |
| 29 | /* Start from 1 and go over fd(0,0,0)kernel */ | |
| 30 | for(iter = 1; iter < 8; iter++) { | |
| 31 | arg = (*(romvec->pv_v0bootargs))->argv[iter]; | |
| 5f66dd35 SR |
32 | if (arg == NULL) |
| 33 | break; | |
| 1da177e4 LT |
34 | while(*arg != 0) { |
| 35 | /* Leave place for space and null. */ | |
| 36 | if(cp >= barg_buf + BARG_LEN-2){ | |
| 37 | /* We might issue a warning here. */ | |
| 38 | break; | |
| 39 | } | |
| 40 | *cp++ = *arg++; | |
| 41 | } | |
| 42 | *cp++ = ' '; | |
| 43 | } | |
| 44 | *cp = 0; | |
| 45 | break; | |
| 46 | case PROM_V2: | |
| 47 | case PROM_V3: | |
| 48 | /* | |
| 49 | * V3 PROM cannot supply as with more than 128 bytes | |
| 50 | * of an argument. But a smart bootstrap loader can. | |
| 51 | */ | |
| 52 | strlcpy(barg_buf, *romvec->pv_v2bootargs.bootargs, sizeof(barg_buf)); | |
| 53 | break; | |
| 54 | default: | |
| 55 | break; | |
| 56 | } | |
| 57 | ||
| 58 | fetched = 1; | |
| 59 | return barg_buf; | |
| 60 | } |