sparc: prepare prom/ for unification
[linux-3.10.git] / arch / sparc / prom / bootstr_32.c
1 /*
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 <linux/init.h>
10
11 #define BARG_LEN  256
12 static char barg_buf[BARG_LEN] = { 0 };
13 static char fetched __initdata = 0;
14
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:
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];
32                         if(arg == 0) break;
33                         while(*arg != 0) {
34                                 /* Leave place for space and null. */
35                                 if(cp >= barg_buf + BARG_LEN-2){
36                                         /* We might issue a warning here. */
37                                         break;
38                                 }
39                                 *cp++ = *arg++;
40                         }
41                         *cp++ = ' ';
42                 }
43                 *cp = 0;
44                 break;
45         case PROM_V2:
46         case PROM_V3:
47                 /*
48                  * V3 PROM cannot supply as with more than 128 bytes
49                  * of an argument. But a smart bootstrap loader can.
50                  */
51                 strlcpy(barg_buf, *romvec->pv_v2bootargs.bootargs, sizeof(barg_buf));
52                 break;
53         default:
54                 break;
55         }
56
57         fetched = 1;
58         return barg_buf;
59 }