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)
27 #define LLONG_MAX ((long long)(~0ULL>>1))
28 #define LLONG_MIN (-LLONG_MAX - 1)
29 #define ULLONG_MAX (~0ULL)
31 #define STACK_MAGIC 0xdeadbeef
33 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
34 #define ALIGN(x,a) (((x)+(a)-1UL)&~((a)-1UL))
35 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
36 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
37 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
39 #define KERN_EMERG "<0>" /* system is unusable */
40 #define KERN_ALERT "<1>" /* action must be taken immediately */
41 #define KERN_CRIT "<2>" /* critical conditions */
42 #define KERN_ERR "<3>" /* error conditions */
43 #define KERN_WARNING "<4>" /* warning conditions */
44 #define KERN_NOTICE "<5>" /* normal but significant condition */
45 #define KERN_INFO "<6>" /* informational */
46 #define KERN_DEBUG "<7>" /* debug-level messages */
48 extern int console_printk[];
50 #define console_loglevel (console_printk[0])
51 #define default_message_loglevel (console_printk[1])
52 #define minimum_console_loglevel (console_printk[2])
53 #define default_console_loglevel (console_printk[3])
60 * might_sleep - annotation for functions that can sleep
62 * this macro will print a stack trace if it is executed in an atomic
63 * context (spinlock, irq-handler, ...).
65 * This is a useful debugging help to be able to catch problems early and not
66 * be biten later when the calling function happens to sleep when it is not
69 #ifdef CONFIG_PREEMPT_VOLUNTARY
70 extern int cond_resched(void);
71 # define might_resched() cond_resched()
73 # define might_resched() do { } while (0)
76 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
77 void __might_sleep(char *file, int line);
78 # define might_sleep() \
79 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
81 # define might_sleep() do { might_resched(); } while (0)
84 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
88 (__x < 0) ? -__x : __x; \
93 (__x < 0) ? -__x : __x; \
96 extern struct atomic_notifier_head panic_notifier_list;
97 extern long (*panic_blink)(long time);
98 NORET_TYPE void panic(const char * fmt, ...)
99 __attribute__ ((NORET_AND format (printf, 1, 2)));
100 extern void oops_enter(void);
101 extern void oops_exit(void);
102 extern int oops_may_print(void);
103 fastcall NORET_TYPE void do_exit(long error_code)
105 NORET_TYPE void complete_and_exit(struct completion *, long)
107 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
108 extern long simple_strtol(const char *,char **,unsigned int);
109 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
110 extern long long simple_strtoll(const char *,char **,unsigned int);
111 extern int sprintf(char * buf, const char * fmt, ...)
112 __attribute__ ((format (printf, 2, 3)));
113 extern int vsprintf(char *buf, const char *, va_list)
114 __attribute__ ((format (printf, 2, 0)));
115 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
116 __attribute__ ((format (printf, 3, 4)));
117 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
118 __attribute__ ((format (printf, 3, 0)));
119 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
120 __attribute__ ((format (printf, 3, 4)));
121 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
122 __attribute__ ((format (printf, 3, 0)));
123 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
124 __attribute__ ((format (printf, 2, 3)));
126 extern int sscanf(const char *, const char *, ...)
127 __attribute__ ((format (scanf, 2, 3)));
128 extern int vsscanf(const char *, const char *, va_list)
129 __attribute__ ((format (scanf, 2, 0)));
131 extern int get_option(char **str, int *pint);
132 extern char *get_options(const char *str, int nints, int *ints);
133 extern unsigned long long memparse(char *ptr, char **retptr);
135 extern int core_kernel_text(unsigned long addr);
136 extern int __kernel_text_address(unsigned long addr);
137 extern int kernel_text_address(unsigned long addr);
138 extern int session_of_pgrp(int pgrp);
140 extern void dump_thread(struct pt_regs *regs, struct user *dump);
143 asmlinkage int vprintk(const char *fmt, va_list args)
144 __attribute__ ((format (printf, 1, 0)));
145 asmlinkage int printk(const char * fmt, ...)
146 __attribute__ ((format (printf, 1, 2)));
148 static inline int vprintk(const char *s, va_list args)
149 __attribute__ ((format (printf, 1, 0)));
150 static inline int vprintk(const char *s, va_list args) { return 0; }
151 static inline int printk(const char *s, ...)
152 __attribute__ ((format (printf, 1, 2)));
153 static inline int printk(const char *s, ...) { return 0; }
156 unsigned long int_sqrt(unsigned long);
158 static inline int __attribute_pure__ long_log2(unsigned long x)
161 for (x >>= 1; x > 0; x >>= 1)
166 static inline unsigned long
167 __attribute_const__ roundup_pow_of_two(unsigned long x)
169 return 1UL << fls_long(x - 1);
172 extern int printk_ratelimit(void);
173 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
175 static inline void console_silent(void)
177 console_loglevel = 0;
180 static inline void console_verbose(void)
182 if (console_loglevel)
183 console_loglevel = 15;
186 extern void bust_spinlocks(int yes);
187 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
188 extern int panic_timeout;
189 extern int panic_on_oops;
190 extern int panic_on_unrecovered_nmi;
192 extern const char *print_tainted(void);
193 extern void add_taint(unsigned);
195 /* Values used for system_state */
196 extern enum system_states {
205 #define TAINT_PROPRIETARY_MODULE (1<<0)
206 #define TAINT_FORCED_MODULE (1<<1)
207 #define TAINT_UNSAFE_SMP (1<<2)
208 #define TAINT_FORCED_RMMOD (1<<3)
209 #define TAINT_MACHINE_CHECK (1<<4)
210 #define TAINT_BAD_PAGE (1<<5)
212 extern void dump_stack(void);
215 /* If you are writing a driver, please use dev_dbg instead */
216 #define pr_debug(fmt,arg...) \
217 printk(KERN_DEBUG fmt,##arg)
219 #define pr_debug(fmt,arg...) \
223 #define pr_info(fmt,arg...) \
224 printk(KERN_INFO fmt,##arg)
227 * Display an IP address in readable format.
230 #define NIPQUAD(addr) \
231 ((unsigned char *)&addr)[0], \
232 ((unsigned char *)&addr)[1], \
233 ((unsigned char *)&addr)[2], \
234 ((unsigned char *)&addr)[3]
235 #define NIPQUAD_FMT "%u.%u.%u.%u"
238 ntohs((addr).s6_addr16[0]), \
239 ntohs((addr).s6_addr16[1]), \
240 ntohs((addr).s6_addr16[2]), \
241 ntohs((addr).s6_addr16[3]), \
242 ntohs((addr).s6_addr16[4]), \
243 ntohs((addr).s6_addr16[5]), \
244 ntohs((addr).s6_addr16[6]), \
245 ntohs((addr).s6_addr16[7])
246 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
247 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
249 #if defined(__LITTLE_ENDIAN)
250 #define HIPQUAD(addr) \
251 ((unsigned char *)&addr)[3], \
252 ((unsigned char *)&addr)[2], \
253 ((unsigned char *)&addr)[1], \
254 ((unsigned char *)&addr)[0]
255 #elif defined(__BIG_ENDIAN)
256 #define HIPQUAD NIPQUAD
258 #error "Please fix asm/byteorder.h"
259 #endif /* __LITTLE_ENDIAN */
262 * min()/max() macros that also do
263 * strict type-checking.. See the
264 * "unnecessary" pointer comparison.
266 #define min(x,y) ({ \
267 typeof(x) _x = (x); \
268 typeof(y) _y = (y); \
269 (void) (&_x == &_y); \
270 _x < _y ? _x : _y; })
272 #define max(x,y) ({ \
273 typeof(x) _x = (x); \
274 typeof(y) _y = (y); \
275 (void) (&_x == &_y); \
276 _x > _y ? _x : _y; })
279 * ..and if you can't take the strict
280 * types, you can specify one yourself.
282 * Or not use min/max at all, of course.
284 #define min_t(type,x,y) \
285 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
286 #define max_t(type,x,y) \
287 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
291 * container_of - cast a member of a structure out to the containing structure
292 * @ptr: the pointer to the member.
293 * @type: the type of the container struct this is embedded in.
294 * @member: the name of the member within the struct.
297 #define container_of(ptr, type, member) ({ \
298 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
299 (type *)( (char *)__mptr - offsetof(type,member) );})
302 * Check at compile time that something is of a particular type.
303 * Always evaluates to 1 so you may use it easily in comparisons.
305 #define typecheck(type,x) \
307 typeof(x) __dummy2; \
308 (void)(&__dummy == &__dummy2); \
313 * Check at compile time that 'function' is a certain type, or is a pointer
314 * to that type (needs to use typedef for the function type.)
316 #define typecheck_fn(type,function) \
317 ({ typeof(type) __tmp = function; \
321 #endif /* __KERNEL__ */
323 #define SI_LOAD_SHIFT 16
325 long uptime; /* Seconds since boot */
326 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
327 unsigned long totalram; /* Total usable main memory size */
328 unsigned long freeram; /* Available memory size */
329 unsigned long sharedram; /* Amount of shared memory */
330 unsigned long bufferram; /* Memory used by buffers */
331 unsigned long totalswap; /* Total swap space size */
332 unsigned long freeswap; /* swap space still available */
333 unsigned short procs; /* Number of current processes */
334 unsigned short pad; /* explicit padding for m68k */
335 unsigned long totalhigh; /* Total high memory size */
336 unsigned long freehigh; /* Available high memory size */
337 unsigned int mem_unit; /* Memory unit size in bytes */
338 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
341 /* Force a compilation error if condition is true */
342 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
344 /* Force a compilation error if condition is true, but also produce a
345 result (of value 0 and type size_t), so the expression can be used
346 e.g. in a structure initializer (or where-ever else comma expressions
347 aren't permitted). */
348 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
350 /* Trap pasters of __FUNCTION__ at compile-time */
351 #define __FUNCTION__ (__func__)
353 /* This helps us to avoid #ifdef CONFIG_NUMA */