Linux Kernel  3.7.1
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malta-cmdline.c
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1 /*
2  * Carsten Langgaard, [email protected]
3  * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
4  *
5  * This program is free software; you can distribute it and/or modify it
6  * under the terms of the GNU General Public License (Version 2) as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12  * for more details.
13  *
14  * You should have received a copy of the GNU General Public License along
15  * with this program; if not, write to the Free Software Foundation, Inc.,
16  * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
17  *
18  * Kernel command line creation using the prom monitor (YAMON) argc/argv.
19  */
20 #include <linux/init.h>
21 #include <linux/string.h>
22 
23 #include <asm/bootinfo.h>
24 
25 extern int prom_argc;
26 extern int *_prom_argv;
27 
28 /*
29  * YAMON (32-bit PROM) pass arguments and environment as 32-bit pointer.
30  * This macro take care of sign extension.
31  */
32 #define prom_argv(index) ((char *)(long)_prom_argv[(index)])
33 
34 char * __init prom_getcmdline(void)
35 {
36  return &(arcs_cmdline[0]);
37 }
38 
39 
41 {
42  char *cp;
43  int actr;
44 
45  actr = 1; /* Always ignore argv[0] */
46 
47  cp = &(arcs_cmdline[0]);
48  while(actr < prom_argc) {
49  strcpy(cp, prom_argv(actr));
50  cp += strlen(prom_argv(actr));
51  *cp++ = ' ';
52  actr++;
53  }
54  if (cp != &(arcs_cmdline[0])) {
55  /* get rid of trailing space */
56  --cp;
57  *cp = '\0';
58  }
59 }