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])
54 * might_sleep - annotation for functions that can sleep
56 * this macro will print a stack trace if it is executed in an atomic
57 * context (spinlock, irq-handler, ...).
59 * This is a useful debugging help to be able to catch problems early and not
60 * be biten later when the calling function happens to sleep when it is not
63 #ifdef CONFIG_PREEMPT_VOLUNTARY
64 extern int cond_resched(void);
65 # define might_resched() cond_resched()
67 # define might_resched() do { } while (0)
70 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
71 void __might_sleep(char *file, int line);
72 # define might_sleep() \
73 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
75 # define might_sleep() do { might_resched(); } while (0)
78 #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
82 (__x < 0) ? -__x : __x; \
87 (__x < 0) ? -__x : __x; \
90 extern struct atomic_notifier_head panic_notifier_list;
91 extern long (*panic_blink)(long time);
92 NORET_TYPE void panic(const char * fmt, ...)
93 __attribute__ ((NORET_AND format (printf, 1, 2)));
94 extern void oops_enter(void);
95 extern void oops_exit(void);
96 extern int oops_may_print(void);
97 fastcall NORET_TYPE void do_exit(long error_code)
99 NORET_TYPE void complete_and_exit(struct completion *, long)
101 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
102 extern long simple_strtol(const char *,char **,unsigned int);
103 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
104 extern long long simple_strtoll(const char *,char **,unsigned int);
105 extern int sprintf(char * buf, const char * fmt, ...)
106 __attribute__ ((format (printf, 2, 3)));
107 extern int vsprintf(char *buf, const char *, va_list)
108 __attribute__ ((format (printf, 2, 0)));
109 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
110 __attribute__ ((format (printf, 3, 4)));
111 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
112 __attribute__ ((format (printf, 3, 0)));
113 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
114 __attribute__ ((format (printf, 3, 4)));
115 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
116 __attribute__ ((format (printf, 3, 0)));
118 extern int sscanf(const char *, const char *, ...)
119 __attribute__ ((format (scanf, 2, 3)));
120 extern int vsscanf(const char *, const char *, va_list)
121 __attribute__ ((format (scanf, 2, 0)));
123 extern int get_option(char **str, int *pint);
124 extern char *get_options(const char *str, int nints, int *ints);
125 extern unsigned long long memparse(char *ptr, char **retptr);
127 extern int __kernel_text_address(unsigned long addr);
128 extern int kernel_text_address(unsigned long addr);
129 extern int session_of_pgrp(int pgrp);
131 extern void dump_thread(struct pt_regs *regs, struct user *dump);
134 asmlinkage int vprintk(const char *fmt, va_list args)
135 __attribute__ ((format (printf, 1, 0)));
136 asmlinkage int printk(const char * fmt, ...)
137 __attribute__ ((format (printf, 1, 2)));
139 static inline int vprintk(const char *s, va_list args)
140 __attribute__ ((format (printf, 1, 0)));
141 static inline int vprintk(const char *s, va_list args) { return 0; }
142 static inline int printk(const char *s, ...)
143 __attribute__ ((format (printf, 1, 2)));
144 static inline int printk(const char *s, ...) { return 0; }
147 unsigned long int_sqrt(unsigned long);
149 static inline int __attribute_pure__ long_log2(unsigned long x)
152 for (x >>= 1; x > 0; x >>= 1)
157 static inline unsigned long
158 __attribute_const__ roundup_pow_of_two(unsigned long x)
160 return 1UL << fls_long(x - 1);
163 extern int printk_ratelimit(void);
164 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
166 static inline void console_silent(void)
168 console_loglevel = 0;
171 static inline void console_verbose(void)
173 if (console_loglevel)
174 console_loglevel = 15;
177 extern void bust_spinlocks(int yes);
178 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
179 extern int panic_timeout;
180 extern int panic_on_oops;
182 extern const char *print_tainted(void);
183 extern void add_taint(unsigned);
185 /* Values used for system_state */
186 extern enum system_states {
195 #define TAINT_PROPRIETARY_MODULE (1<<0)
196 #define TAINT_FORCED_MODULE (1<<1)
197 #define TAINT_UNSAFE_SMP (1<<2)
198 #define TAINT_FORCED_RMMOD (1<<3)
199 #define TAINT_MACHINE_CHECK (1<<4)
200 #define TAINT_BAD_PAGE (1<<5)
202 extern void dump_stack(void);
205 #define pr_debug(fmt,arg...) \
206 printk(KERN_DEBUG fmt,##arg)
208 #define pr_debug(fmt,arg...) \
212 #define pr_info(fmt,arg...) \
213 printk(KERN_INFO fmt,##arg)
216 * Display an IP address in readable format.
219 #define NIPQUAD(addr) \
220 ((unsigned char *)&addr)[0], \
221 ((unsigned char *)&addr)[1], \
222 ((unsigned char *)&addr)[2], \
223 ((unsigned char *)&addr)[3]
224 #define NIPQUAD_FMT "%u.%u.%u.%u"
227 ntohs((addr).s6_addr16[0]), \
228 ntohs((addr).s6_addr16[1]), \
229 ntohs((addr).s6_addr16[2]), \
230 ntohs((addr).s6_addr16[3]), \
231 ntohs((addr).s6_addr16[4]), \
232 ntohs((addr).s6_addr16[5]), \
233 ntohs((addr).s6_addr16[6]), \
234 ntohs((addr).s6_addr16[7])
235 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
236 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
238 #if defined(__LITTLE_ENDIAN)
239 #define HIPQUAD(addr) \
240 ((unsigned char *)&addr)[3], \
241 ((unsigned char *)&addr)[2], \
242 ((unsigned char *)&addr)[1], \
243 ((unsigned char *)&addr)[0]
244 #elif defined(__BIG_ENDIAN)
245 #define HIPQUAD NIPQUAD
247 #error "Please fix asm/byteorder.h"
248 #endif /* __LITTLE_ENDIAN */
251 * min()/max() macros that also do
252 * strict type-checking.. See the
253 * "unnecessary" pointer comparison.
255 #define min(x,y) ({ \
256 typeof(x) _x = (x); \
257 typeof(y) _y = (y); \
258 (void) (&_x == &_y); \
259 _x < _y ? _x : _y; })
261 #define max(x,y) ({ \
262 typeof(x) _x = (x); \
263 typeof(y) _y = (y); \
264 (void) (&_x == &_y); \
265 _x > _y ? _x : _y; })
268 * ..and if you can't take the strict
269 * types, you can specify one yourself.
271 * Or not use min/max at all, of course.
273 #define min_t(type,x,y) \
274 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
275 #define max_t(type,x,y) \
276 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
280 * container_of - cast a member of a structure out to the containing structure
281 * @ptr: the pointer to the member.
282 * @type: the type of the container struct this is embedded in.
283 * @member: the name of the member within the struct.
286 #define container_of(ptr, type, member) ({ \
287 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
288 (type *)( (char *)__mptr - offsetof(type,member) );})
291 * Check at compile time that something is of a particular type.
292 * Always evaluates to 1 so you may use it easily in comparisons.
294 #define typecheck(type,x) \
296 typeof(x) __dummy2; \
297 (void)(&__dummy == &__dummy2); \
302 * Check at compile time that 'function' is a certain type, or is a pointer
303 * to that type (needs to use typedef for the function type.)
305 #define typecheck_fn(type,function) \
306 ({ typeof(type) __tmp = function; \
310 #endif /* __KERNEL__ */
312 #define SI_LOAD_SHIFT 16
314 long uptime; /* Seconds since boot */
315 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
316 unsigned long totalram; /* Total usable main memory size */
317 unsigned long freeram; /* Available memory size */
318 unsigned long sharedram; /* Amount of shared memory */
319 unsigned long bufferram; /* Memory used by buffers */
320 unsigned long totalswap; /* Total swap space size */
321 unsigned long freeswap; /* swap space still available */
322 unsigned short procs; /* Number of current processes */
323 unsigned short pad; /* explicit padding for m68k */
324 unsigned long totalhigh; /* Total high memory size */
325 unsigned long freehigh; /* Available high memory size */
326 unsigned int mem_unit; /* Memory unit size in bytes */
327 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
330 /* Force a compilation error if condition is true */
331 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
333 /* Trap pasters of __FUNCTION__ at compile-time */
334 #define __FUNCTION__ (__func__)