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
15int fw_argc;
16int *_fw_argv;
17int *_fw_envp;
18
19#ifndef CONFIG_HAVE_PLAT_FW_INIT_CMDLINE
20void __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
47char * __init fw_getcmdline(void)
48{
49	return &(arcs_cmdline[0]);
50}
51
52char *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
89unsigned 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