| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 (davem@caip.rutgers.edu) |
| 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 | } |