tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
MIPS: FW: Add environment variable processing.
Add parsing of the environment and command line variables passed to
the kernel to the firmware library.
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
authored by
Steven J. Hill
and committed by
Ralf Baechle
14aecdd4
98ffcf60
+150
+2
arch/mips/fw/lib/Makefile
+2
arch/mips/fw/lib/Makefile
+101
arch/mips/fw/lib/cmdline.c
+101
arch/mips/fw/lib/cmdline.c
···
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
+
void __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
+
45
+
char * __init fw_getcmdline(void)
46
+
{
47
+
return &(arcs_cmdline[0]);
48
+
}
49
+
50
+
char *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 + 1) + i);
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
+
87
+
unsigned long fw_getenvl(char *envname)
88
+
{
89
+
unsigned long envl = 0UL;
90
+
char *str;
91
+
long val;
92
+
int tmp;
93
+
94
+
str = fw_getenv(envname);
95
+
if (str) {
96
+
tmp = kstrtol(str, 0, &val);
97
+
envl = (unsigned long)val;
98
+
}
99
+
100
+
return envl;
101
+
}
+47
arch/mips/include/asm/fw/fw.h
+47
arch/mips/include/asm/fw/fw.h
···
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.
7
+
*/
8
+
#ifndef __ASM_FW_H_
9
+
#define __ASM_FW_H_
10
+
11
+
#include <asm/bootinfo.h> /* For cleaner code... */
12
+
13
+
enum fw_memtypes {
14
+
fw_dontuse,
15
+
fw_code,
16
+
fw_free,
17
+
};
18
+
19
+
typedef struct {
20
+
unsigned long base; /* Within KSEG0 */
21
+
unsigned int size; /* bytes */
22
+
enum fw_memtypes type; /* fw_memtypes */
23
+
} fw_memblock_t;
24
+
25
+
/* Maximum number of memory block descriptors. */
26
+
#define FW_MAX_MEMBLOCKS 32
27
+
28
+
extern int fw_argc;
29
+
extern int *_fw_argv;
30
+
extern int *_fw_envp;
31
+
32
+
/*
33
+
* Most firmware like YAMON, PMON, etc. pass arguments and environment
34
+
* variables as 32-bit pointers. These take care of sign extension.
35
+
*/
36
+
#define fw_argv(index) ((char *)(long)_fw_argv[(index)])
37
+
#define fw_envp(index) ((char *)(long)_fw_envp[(index)])
38
+
39
+
extern void fw_init_cmdline(void);
40
+
extern char *fw_getcmdline(void);
41
+
extern fw_memblock_t *fw_getmdesc(void);
42
+
extern void fw_meminit(void);
43
+
extern char *fw_getenv(char *name);
44
+
extern unsigned long fw_getenvl(char *name);
45
+
extern void fw_init_early_console(char port);
46
+
47
+
#endif /* __ASM_FW_H_ */