ia64/linux-2.6.18-xen.hg

view arch/sparc/prom/bootstr.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
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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 */
7 #include <linux/string.h>
8 #include <asm/oplib.h>
9 #include <asm/sun4prom.h>
10 #include <linux/init.h>
12 #define BARG_LEN 256
13 static char barg_buf[BARG_LEN] = { 0 };
14 static char fetched __initdata = 0;
16 extern linux_sun4_romvec *sun4_romvec;
18 char * __init
19 prom_getbootargs(void)
20 {
21 int iter;
22 char *cp, *arg;
24 /* This check saves us from a panic when bootfd patches args. */
25 if (fetched) {
26 return barg_buf;
27 }
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 }
61 fetched = 1;
62 return barg_buf;
63 }