1 #ifndef _LINUX_KERNEL_H
2 #define _LINUX_KERNEL_H
3
4 /*
5 * 'kernel.h' contains some often-used function prototypes etc
6 */
7
8 #ifdef __KERNEL__
9
10 #include <stdarg.h>
11 #include <linux/linkage.h>
12 #include <linux/stddef.h>
13 #include <linux/types.h>
14 #include <linux/compiler.h>
15 #include <asm/byteorder.h>
16
17 /* Optimization barrier */
18 /* The "volatile" is due to gcc bugs */
19 #define barrier() __asm__ __volatile__("": : :"memory")
20
21 #define INT_MAX ((int)(~0U>>1))
22 #define INT_MIN (-INT_MAX - 1)
23 #define UINT_MAX (~0U)
24 #define LONG_MAX ((long)(~0UL>>1))
25 #define LONG_MIN (-LONG_MAX - 1)
26 #define ULONG_MAX (~0UL)
27
28 #define STACK_MAGIC 0xdeadbeef
29
30 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
31
32 #define KERN_EMERG "<0>" /* system is unusable */
33 #define KERN_ALERT "<1>" /* action must be taken immediately */
34 #define KERN_CRIT "<2>" /* critical conditions */
35 #define KERN_ERR "<3>" /* error conditions */
36 #define KERN_WARNING "<4>" /* warning conditions */
37 #define KERN_NOTICE "<5>" /* normal but significant condition */
38 #define KERN_INFO "<6>" /* informational */
39 #define KERN_DEBUG "<7>" /* debug-level messages */
40
41 extern int console_printk[];
42
43 #define console_loglevel (console_printk[0])
44 #define default_message_loglevel (console_printk[1])
45 #define minimum_console_loglevel (console_printk[2])
46 #define default_console_loglevel (console_printk[3])
47
48 # define NORET_TYPE /**/
49 # define ATTRIB_NORET __attribute__((noreturn))
50 # define NORET_AND noreturn,
51
52 #ifdef __i386__
53 #define FASTCALL(x) x __attribute__((regparm(3)))
54 #define fastcall __attribute__((regparm(3)))
55 #else
56 #define FASTCALL(x) x
57 #define fastcall
58 #endif
59
60 struct completion;
61
62 extern struct notifier_block *panic_notifier_list;
63 NORET_TYPE void panic(const char * fmt, ...)
64 __attribute__ ((NORET_AND format (printf, 1, 2)));
65 asmlinkage NORET_TYPE void do_exit(long error_code)
66 ATTRIB_NORET;
67 NORET_TYPE void complete_and_exit(struct completion *, long)
68 ATTRIB_NORET;
69 extern int abs(int);
70 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
71 extern long simple_strtol(const char *,char **,unsigned int);
72 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
73 extern long long simple_strtoll(const char *,char **,unsigned int);
74 extern int sprintf(char * buf, const char * fmt, ...)
75 __attribute__ ((format (printf, 2, 3)));
76 extern int vsprintf(char *buf, const char *, va_list)
77 __attribute__ ((format (printf, 2, 0)));
78 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
79 __attribute__ ((format (printf, 3, 4)));
80 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
81 __attribute__ ((format (printf, 3, 0)));
82
83 extern int sscanf(const char *, const char *, ...)
84 __attribute__ ((format (scanf, 2, 3)));
85 extern int vsscanf(const char *, const char *, va_list)
86 __attribute__ ((format (scanf, 2, 0)));
87
88 extern int get_option(char **str, int *pint);
89 extern char *get_options(char *str, int nints, int *ints);
90 extern unsigned long long memparse(char *ptr, char **retptr);
91 extern void dev_probe_lock(void);
92 extern void dev_probe_unlock(void);
93
94 extern int session_of_pgrp(int pgrp);
95
96 asmlinkage int printk(const char * fmt, ...)
97 __attribute__ ((format (printf, 1, 2)));
98
console_silent(void)99 static inline void console_silent(void)
100 {
101 console_loglevel = 0;
102 }
103
console_verbose(void)104 static inline void console_verbose(void)
105 {
106 if (console_loglevel)
107 console_loglevel = 15;
108 }
109
110 extern void bust_spinlocks(int yes);
111 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
112
113 extern int tainted;
114 extern const char *print_tainted(void);
115
116 extern void dump_stack(void);
117
118 #if DEBUG
119 #define pr_debug(fmt,arg...) \
120 printk(KERN_DEBUG fmt,##arg)
121 #else
122 #define pr_debug(fmt,arg...) \
123 do { } while (0)
124 #endif
125
126 #define pr_info(fmt,arg...) \
127 printk(KERN_INFO fmt,##arg)
128
129 /*
130 * Display an IP address in readable format.
131 */
132
133 #define NIPQUAD(addr) \
134 ((unsigned char *)&addr)[0], \
135 ((unsigned char *)&addr)[1], \
136 ((unsigned char *)&addr)[2], \
137 ((unsigned char *)&addr)[3]
138
139 #if defined(__LITTLE_ENDIAN)
140 #define HIPQUAD(addr) \
141 ((unsigned char *)&addr)[3], \
142 ((unsigned char *)&addr)[2], \
143 ((unsigned char *)&addr)[1], \
144 ((unsigned char *)&addr)[0]
145 #elif defined(__BIG_ENDIAN)
146 #define HIPQUAD NIPQUAD
147 #else
148 #error "Please fix asm/byteorder.h"
149 #endif /* __LITTLE_ENDIAN */
150
151 /*
152 * min()/max() macros that also do
153 * strict type-checking.. See the
154 * "unnecessary" pointer comparison.
155 */
156 #define min(x,y) ({ \
157 const typeof(x) _x = (x); \
158 const typeof(y) _y = (y); \
159 (void) (&_x == &_y); \
160 _x < _y ? _x : _y; })
161
162 #define max(x,y) ({ \
163 const typeof(x) _x = (x); \
164 const typeof(y) _y = (y); \
165 (void) (&_x == &_y); \
166 _x > _y ? _x : _y; })
167
168 /*
169 * ..and if you can't take the strict
170 * types, you can specify one yourself.
171 *
172 * Or not use min/max at all, of course.
173 */
174 #define min_t(type,x,y) \
175 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
176 #define max_t(type,x,y) \
177 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
178
179 extern void __out_of_line_bug(int line) ATTRIB_NORET;
180 #define out_of_line_bug() __out_of_line_bug(__LINE__)
181
182 #endif /* __KERNEL__ */
183
184 #define SI_LOAD_SHIFT 16
185 struct sysinfo {
186 long uptime; /* Seconds since boot */
187 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
188 unsigned long totalram; /* Total usable main memory size */
189 unsigned long freeram; /* Available memory size */
190 unsigned long sharedram; /* Amount of shared memory */
191 unsigned long bufferram; /* Memory used by buffers */
192 unsigned long totalswap; /* Total swap space size */
193 unsigned long freeswap; /* swap space still available */
194 unsigned short procs; /* Number of current processes */
195 unsigned short pad; /* explicit padding for m68k */
196 unsigned long totalhigh; /* Total high memory size */
197 unsigned long freehigh; /* Available high memory size */
198 unsigned int mem_unit; /* Memory unit size in bytes */
199 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
200 };
201
202 #define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0)
203
204 #define WARN_ON(condition) do { \
205 if (unlikely((condition)!=0)) { \
206 printk("Badness in %s at %s:%d\n", __FUNCTION__, __FILE__, __LINE__); \
207 dump_stack(); \
208 } \
209 } while (0)
210
211 #endif /* _LINUX_KERNEL_H */
212