1 #ifndef _LINUX_KERNEL_H
2 #define _LINUX_KERNEL_H
5 * 'kernel.h' contains some often-used function prototypes etc
11 #include <linux/linkage.h>
12 #include <linux/stddef.h>
13 #include <linux/types.h>
14 #include <linux/compiler.h>
15 #include <linux/bitops.h>
16 #include <asm/byteorder.h>
19 extern const char linux_banner[];
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)
28 #define STACK_MAGIC 0xdeadbeef
30 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
31 #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
33 #define KERN_EMERG "<0>" /* system is unusable */
34 #define KERN_ALERT "<1>" /* action must be taken immediately */
35 #define KERN_CRIT "<2>" /* critical conditions */
36 #define KERN_ERR "<3>" /* error conditions */
37 #define KERN_WARNING "<4>" /* warning conditions */
38 #define KERN_NOTICE "<5>" /* normal but significant condition */
39 #define KERN_INFO "<6>" /* informational */
40 #define KERN_DEBUG "<7>" /* debug-level messages */
42 extern int console_printk[];
44 #define console_loglevel (console_printk[0])
45 #define default_message_loglevel (console_printk[1])
46 #define minimum_console_loglevel (console_printk[2])
47 #define default_console_loglevel (console_printk[3])
51 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
52 void __might_sleep(char *file, int line);
53 #define might_sleep() __might_sleep(__FILE__, __LINE__)
54 #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
56 #define might_sleep() do {} while(0)
57 #define might_sleep_if(cond) do {} while (0)
62 (__x < 0) ? -__x : __x; \
67 (__x < 0) ? -__x : __x; \
70 extern struct notifier_block *panic_notifier_list;
71 extern long (*panic_blink)(long time);
72 NORET_TYPE void panic(const char * fmt, ...)
73 __attribute__ ((NORET_AND format (printf, 1, 2)));
74 fastcall NORET_TYPE void do_exit(long error_code)
76 NORET_TYPE void complete_and_exit(struct completion *, long)
78 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
79 extern long simple_strtol(const char *,char **,unsigned int);
80 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
81 extern long long simple_strtoll(const char *,char **,unsigned int);
82 extern int sprintf(char * buf, const char * fmt, ...)
83 __attribute__ ((format (printf, 2, 3)));
84 extern int vsprintf(char *buf, const char *, va_list);
85 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
86 __attribute__ ((format (printf, 3, 4)));
87 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
88 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
89 __attribute__ ((format (printf, 3, 4)));
90 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
92 extern int sscanf(const char *, const char *, ...)
93 __attribute__ ((format (scanf,2,3)));
94 extern int vsscanf(const char *, const char *, va_list);
96 extern void qsort(void *, size_t, size_t, int (*)(const void *,const void *));
98 extern int get_option(char **str, int *pint);
99 extern char *get_options(const char *str, int nints, int *ints);
100 extern unsigned long long memparse(char *ptr, char **retptr);
102 extern int __kernel_text_address(unsigned long addr);
103 extern int kernel_text_address(unsigned long addr);
104 extern int session_of_pgrp(int pgrp);
106 asmlinkage int vprintk(const char *fmt, va_list args);
107 asmlinkage int printk(const char * fmt, ...)
108 __attribute__ ((format (printf, 1, 2)));
110 unsigned long int_sqrt(unsigned long);
112 static inline int __attribute_pure__ long_log2(unsigned long x)
115 for (x >>= 1; x > 0; x >>= 1)
120 static inline unsigned long __attribute_const__ roundup_pow_of_two(unsigned long x)
122 return (1UL << fls(x - 1));
125 extern int printk_ratelimit(void);
126 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
128 static inline void console_silent(void)
130 console_loglevel = 0;
133 static inline void console_verbose(void)
135 if (console_loglevel)
136 console_loglevel = 15;
139 extern void bust_spinlocks(int yes);
140 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
141 extern int panic_timeout;
142 extern int panic_on_oops;
144 extern const char *print_tainted(void);
145 extern void add_taint(unsigned);
147 /* Values used for system_state */
148 extern enum system_states {
156 #define TAINT_PROPRIETARY_MODULE (1<<0)
157 #define TAINT_FORCED_MODULE (1<<1)
158 #define TAINT_UNSAFE_SMP (1<<2)
159 #define TAINT_FORCED_RMMOD (1<<3)
160 #define TAINT_MACHINE_CHECK (1<<4)
161 #define TAINT_BAD_PAGE (1<<5)
163 extern void dump_stack(void);
166 #define pr_debug(fmt,arg...) \
167 printk(KERN_DEBUG fmt,##arg)
169 #define pr_debug(fmt,arg...) \
173 #define pr_info(fmt,arg...) \
174 printk(KERN_INFO fmt,##arg)
177 * Display an IP address in readable format.
180 #define NIPQUAD(addr) \
181 ((unsigned char *)&addr)[0], \
182 ((unsigned char *)&addr)[1], \
183 ((unsigned char *)&addr)[2], \
184 ((unsigned char *)&addr)[3]
187 ntohs((addr).s6_addr16[0]), \
188 ntohs((addr).s6_addr16[1]), \
189 ntohs((addr).s6_addr16[2]), \
190 ntohs((addr).s6_addr16[3]), \
191 ntohs((addr).s6_addr16[4]), \
192 ntohs((addr).s6_addr16[5]), \
193 ntohs((addr).s6_addr16[6]), \
194 ntohs((addr).s6_addr16[7])
196 #if defined(__LITTLE_ENDIAN)
197 #define HIPQUAD(addr) \
198 ((unsigned char *)&addr)[3], \
199 ((unsigned char *)&addr)[2], \
200 ((unsigned char *)&addr)[1], \
201 ((unsigned char *)&addr)[0]
202 #elif defined(__BIG_ENDIAN)
203 #define HIPQUAD NIPQUAD
205 #error "Please fix asm/byteorder.h"
206 #endif /* __LITTLE_ENDIAN */
209 * min()/max() macros that also do
210 * strict type-checking.. See the
211 * "unnecessary" pointer comparison.
213 #define min(x,y) ({ \
214 typeof(x) _x = (x); \
215 typeof(y) _y = (y); \
216 (void) (&_x == &_y); \
217 _x < _y ? _x : _y; })
219 #define max(x,y) ({ \
220 typeof(x) _x = (x); \
221 typeof(y) _y = (y); \
222 (void) (&_x == &_y); \
223 _x > _y ? _x : _y; })
226 * ..and if you can't take the strict
227 * types, you can specify one yourself.
229 * Or not use min/max at all, of course.
231 #define min_t(type,x,y) \
232 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
233 #define max_t(type,x,y) \
234 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
238 * container_of - cast a member of a structure out to the containing structure
240 * @ptr: the pointer to the member.
241 * @type: the type of the container struct this is embedded in.
242 * @member: the name of the member within the struct.
245 #define container_of(ptr, type, member) ({ \
246 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
247 (type *)( (char *)__mptr - offsetof(type,member) );})
250 * Check at compile time that something is of a particular type.
251 * Always evaluates to 1 so you may use it easily in comparisons.
253 #define typecheck(type,x) \
255 typeof(x) __dummy2; \
256 (void)(&__dummy == &__dummy2); \
260 #endif /* __KERNEL__ */
262 #define SI_LOAD_SHIFT 16
264 long uptime; /* Seconds since boot */
265 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
266 unsigned long totalram; /* Total usable main memory size */
267 unsigned long freeram; /* Available memory size */
268 unsigned long sharedram; /* Amount of shared memory */
269 unsigned long bufferram; /* Memory used by buffers */
270 unsigned long totalswap; /* Total swap space size */
271 unsigned long freeswap; /* swap space still available */
272 unsigned short procs; /* Number of current processes */
273 unsigned short pad; /* explicit padding for m68k */
274 unsigned long totalhigh; /* Total high memory size */
275 unsigned long freehigh; /* Available high memory size */
276 unsigned int mem_unit; /* Memory unit size in bytes */
277 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
280 extern void BUILD_BUG(void);
281 #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
283 /* Trap pasters of __FUNCTION__ at compile-time */
284 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
285 #define __FUNCTION__ (__func__)