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
19void __init fw_init_cmdline(void)
20{
21	int i;
22
23	/* Validate command line parameters. */
24	if ((fw_arg0 >= CKSEG0) || (fw_arg1 < CKSEG0)) {
25		fw_argc = 0;
26		_fw_argv = NULL;
27	} else {
28		fw_argc = (fw_arg0 & 0x0000ffff);
29		_fw_argv = (int *)fw_arg1;
30	}
31
32	/* Validate environment pointer. */
33	if (fw_arg2 < CKSEG0)
34		_fw_envp = NULL;
35	else
36		_fw_envp = (int *)fw_arg2;
37
38	for (i = 1; i < fw_argc; i++) {
39		strlcat(arcs_cmdline, fw_argv(i), COMMAND_LINE_SIZE);
40		if (i < (fw_argc - 1))
41			strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
42	}
43}
44
45char * __init fw_getcmdline(void)
46{
47	return &(arcs_cmdline[0]);
48}
49
50char *fw_getenv(char *envname)
51{
52	char *result = NULL;
53
54	if (_fw_envp != NULL) {
55		/*
56		 * Return a pointer to the given environment variable.
57		 * YAMON uses "name", "value" pairs, while U-Boot uses
58		 * "name=value".
59		 */
60		int i, yamon, index = 0;
61
62		yamon = (strchr(fw_envp(index), '=') == NULL);
63		i = strlen(envname);
64
65		while (fw_envp(index)) {
66			if (strncmp(envname, fw_envp(index), i) == 0) {
67				if (yamon) {
68					result = fw_envp(index + 1);
69					break;
70				} else if (fw_envp(index)[i] == '=') {
71					result = fw_envp(index) + i + 1;
72					break;
73				}
74			}
75
76			/* Increment array index. */
77			if (yamon)
78				index += 2;
79			else
80				index += 1;
81		}
82	}
83
84	return result;
85}
86
87unsigned long fw_getenvl(char *envname)
88{
89	unsigned long envl = 0UL;
90	char *str;
91	int tmp;
92
93	str = fw_getenv(envname);
94	if (str) {
95		tmp = kstrtoul(str, 0, &envl);
96		if (tmp)
97			envl = 0;
98	}
99
100	return envl;
101}
102