1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
7 */
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/string.h>
11
12 #include <asm/addrspace.h>
13 #include <asm/fw/fw.h>
14
15 int fw_argc;
16 int *_fw_argv;
17 int *_fw_envp;
18
19 #ifndef CONFIG_HAVE_PLAT_FW_INIT_CMDLINE
20 void __init fw_init_cmdline(void)
21 {
22 int i;
23
24 /* Validate command line parameters. */
25 if ((fw_arg0 >= CKSEG0) || (fw_arg1 < CKSEG0)) {
26 fw_argc = 0;
27 _fw_argv = NULL;
28 } else {
29 fw_argc = (fw_arg0 & 0x0000ffff);
30 _fw_argv = (int *)fw_arg1;
31 }
32
33 /* Validate environment pointer. */
34 if (fw_arg2 < CKSEG0)
35 _fw_envp = NULL;
36 else
37 _fw_envp = (int *)fw_arg2;
38
39 for (i = 1; i < fw_argc; i++) {
40 strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE);
41 if (i < (fw_argc - 1))
42 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
43 }
44 }
45 #endif
46
47 char * __init fw_getcmdline(void)
48 {
49 return &(arcs_cmdline[0]);
50 }
51
52 char *fw_getenv(char *envname)
53 {
54 char *result = NULL;
55
56 if (_fw_envp != NULL && fw_envp(0) != NULL) {
57 /*
58 * Return a pointer to the given environment variable.
59 * YAMON uses "name", "value" pairs, while U-Boot uses
60 * "name=value".
61 */
62 int i, yamon, index = 0;
63
64 yamon = (strchr(fw_envp(index), '=') == NULL);
65 i = strlen(envname);
66
67 while (fw_envp(index)) {
68 if (strncmp(envname, fw_envp(index), i) == 0) {
69 if (yamon) {
70 result = fw_envp(index + 1);
71 break;
72 } else if (fw_envp(index)[i] == '=') {
73 result = fw_envp(index) + i + 1;
74 break;
75 }
76 }
77
78 /* Increment array index. */
79 if (yamon)
80 index += 2;
81 else
82 index += 1;
83 }
84 }
85
86 return result;
87 }
88
89 unsigned long fw_getenvl(char *envname)
90 {
91 unsigned long envl = 0UL;
92 char *str;
93 int tmp;
94
95 str = fw_getenv(envname);
96 if (str) {
97 tmp = kstrtoul(str, 0, &envl);
98 if (tmp)
99 envl = 0;
100 }
101
102 return envl;
103 }
104
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