projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* $Id: bootstr.c,v 1.20 2000/02/08 20:24:23 davem Exp $ |
| 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> | |
| 9 | #include <asm/sun4prom.h> | |
| 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 | ||
| 16 | extern linux_sun4_romvec *sun4_romvec; | |
| 17 | ||
| 18 | char * __init | |
| 19 | prom_getbootargs(void) | |
| 20 | { | |
| 21 | int iter; | |
| 22 | char *cp, *arg; | |
| 23 | ||
| 24 | /* This check saves us from a panic when bootfd patches args. */ | |
| 25 | if (fetched) { | |
| 26 | return barg_buf; | |
| 27 | } | |
| 28 | ||
| 29 | switch(prom_vers) { | |
| 30 | case PROM_V0: | |
| 31 | case PROM_SUN4: | |
| 32 | cp = barg_buf; | |
| 33 | /* Start from 1 and go over fd(0,0,0)kernel */ | |
| 34 | for(iter = 1; iter < 8; iter++) { | |
| 35 | arg = (*(romvec->pv_v0bootargs))->argv[iter]; | |
| 36 | if(arg == 0) break; | |
| 37 | while(*arg != 0) { | |
| 38 | /* Leave place for space and null. */ | |
| 39 | if(cp >= barg_buf + BARG_LEN-2){ | |
| 40 | /* We might issue a warning here. */ | |
| 41 | break; | |
| 42 | } | |
| 43 | *cp++ = *arg++; | |
| 44 | } | |
| 45 | *cp++ = ' '; | |
| 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 | } |