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)-1)&~((a)-1))
36 #define KERN_EMERG "<0>" /* system is unusable */
37 #define KERN_ALERT "<1>" /* action must be taken immediately */
38 #define KERN_CRIT "<2>" /* critical conditions */
39 #define KERN_ERR "<3>" /* error conditions */
40 #define KERN_WARNING "<4>" /* warning conditions */
41 #define KERN_NOTICE "<5>" /* normal but significant condition */
42 #define KERN_INFO "<6>" /* informational */
43 #define KERN_DEBUG "<7>" /* debug-level messages */
45 extern int console_printk[];
47 #define console_loglevel (console_printk[0])
48 #define default_message_loglevel (console_printk[1])
49 #define minimum_console_loglevel (console_printk[2])
50 #define default_console_loglevel (console_printk[3])
57 * might_sleep - annotation for functions that can sleep
59 * this macro will print a stack trace if it is executed in an atomic
60 * context (spinlock, irq-handler, ...).
62 * This is a useful debugging help to be able to catch problems early and not
63 * be biten later when the calling function happens to sleep when it is not
66 #ifdef CONFIG_PREEMPT_VOLUNTARY
67 extern int cond_resched(void);
68 # define might_resched() cond_resched()
70 # define might_resched() do { } while (0)
73 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
74 void __might_sleep(char *file, int line);
75 # define might_sleep() \
76 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
78 # define might_sleep() do { might_resched(); } while (0)
81 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
85 (__x < 0) ? -__x : __x; \
90 (__x < 0) ? -__x : __x; \
93 extern struct atomic_notifier_head panic_notifier_list;
94 extern long (*panic_blink)(long time);
95 NORET_TYPE void panic(const char * fmt, ...)
96 __attribute__ ((NORET_AND format (printf, 1, 2)));
97 extern void oops_enter(void);
98 extern void oops_exit(void);
99 extern int oops_may_print(void);
100 fastcall NORET_TYPE void do_exit(long error_code)
102 NORET_TYPE void complete_and_exit(struct completion *, long)
104 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
105 extern long simple_strtol(const char *,char **,unsigned int);
106 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
107 extern long long simple_strtoll(const char *,char **,unsigned int);
108 extern int sprintf(char * buf, const char * fmt, ...)
109 __attribute__ ((format (printf, 2, 3)));
110 extern int vsprintf(char *buf, const char *, va_list)
111 __attribute__ ((format (printf, 2, 0)));
112 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
113 __attribute__ ((format (printf, 3, 4)));
114 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
115 __attribute__ ((format (printf, 3, 0)));
116 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
117 __attribute__ ((format (printf, 3, 4)));
118 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
119 __attribute__ ((format (printf, 3, 0)));
120 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
121 __attribute__ ((format (printf, 2, 3)));
123 extern int sscanf(const char *, const char *, ...)
124 __attribute__ ((format (scanf, 2, 3)));
125 extern int vsscanf(const char *, const char *, va_list)
126 __attribute__ ((format (scanf, 2, 0)));
128 extern int get_option(char **str, int *pint);
129 extern char *get_options(const char *str, int nints, int *ints);
130 extern unsigned long long memparse(char *ptr, char **retptr);
132 extern int core_kernel_text(unsigned long addr);
133 extern int __kernel_text_address(unsigned long addr);
134 extern int kernel_text_address(unsigned long addr);
135 extern int session_of_pgrp(int pgrp);
137 extern void dump_thread(struct pt_regs *regs, struct user *dump);
140 asmlinkage int vprintk(const char *fmt, va_list args)
141 __attribute__ ((format (printf, 1, 0)));
142 asmlinkage int printk(const char * fmt, ...)
143 __attribute__ ((format (printf, 1, 2)));
145 static inline int vprintk(const char *s, va_list args)
146 __attribute__ ((format (printf, 1, 0)));
147 static inline int vprintk(const char *s, va_list args) { return 0; }
148 static inline int printk(const char *s, ...)
149 __attribute__ ((format (printf, 1, 2)));
150 static inline int printk(const char *s, ...) { return 0; }
153 unsigned long int_sqrt(unsigned long);
155 static inline int __attribute_pure__ long_log2(unsigned long x)
158 for (x >>= 1; x > 0; x >>= 1)
163 static inline unsigned long
164 __attribute_const__ roundup_pow_of_two(unsigned long x)
166 return 1UL << fls_long(x - 1);
169 extern int printk_ratelimit(void);
170 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
172 static inline void console_silent(void)
174 console_loglevel = 0;
177 static inline void console_verbose(void)
179 if (console_loglevel)
180 console_loglevel = 15;
183 extern void bust_spinlocks(int yes);
184 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
185 extern int panic_timeout;
186 extern int panic_on_oops;
188 extern const char *print_tainted(void);
189 extern void add_taint(unsigned);
191 /* Values used for system_state */
192 extern enum system_states {
201 #define TAINT_PROPRIETARY_MODULE (1<<0)
202 #define TAINT_FORCED_MODULE (1<<1)
203 #define TAINT_UNSAFE_SMP (1<<2)
204 #define TAINT_FORCED_RMMOD (1<<3)
205 #define TAINT_MACHINE_CHECK (1<<4)
206 #define TAINT_BAD_PAGE (1<<5)
208 extern void dump_stack(void);
211 #define pr_debug(fmt,arg...) \
212 printk(KERN_DEBUG fmt,##arg)
214 #define pr_debug(fmt,arg...) \
218 #define pr_info(fmt,arg...) \
219 printk(KERN_INFO fmt,##arg)
222 * Display an IP address in readable format.
225 #define NIPQUAD(addr) \
226 ((unsigned char *)&addr)[0], \
227 ((unsigned char *)&addr)[1], \
228 ((unsigned char *)&addr)[2], \
229 ((unsigned char *)&addr)[3]
230 #define NIPQUAD_FMT "%u.%u.%u.%u"
233 ntohs((addr).s6_addr16[0]), \
234 ntohs((addr).s6_addr16[1]), \
235 ntohs((addr).s6_addr16[2]), \
236 ntohs((addr).s6_addr16[3]), \
237 ntohs((addr).s6_addr16[4]), \
238 ntohs((addr).s6_addr16[5]), \
239 ntohs((addr).s6_addr16[6]), \
240 ntohs((addr).s6_addr16[7])
241 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
242 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
244 #if defined(__LITTLE_ENDIAN)
245 #define HIPQUAD(addr) \
246 ((unsigned char *)&addr)[3], \
247 ((unsigned char *)&addr)[2], \
248 ((unsigned char *)&addr)[1], \
249 ((unsigned char *)&addr)[0]
250 #elif defined(__BIG_ENDIAN)
251 #define HIPQUAD NIPQUAD
253 #error "Please fix asm/byteorder.h"
254 #endif /* __LITTLE_ENDIAN */
257 * min()/max() macros that also do
258 * strict type-checking.. See the
259 * "unnecessary" pointer comparison.
261 #define min(x,y) ({ \
262 typeof(x) _x = (x); \
263 typeof(y) _y = (y); \
264 (void) (&_x == &_y); \
265 _x < _y ? _x : _y; })
267 #define max(x,y) ({ \
268 typeof(x) _x = (x); \
269 typeof(y) _y = (y); \
270 (void) (&_x == &_y); \
271 _x > _y ? _x : _y; })
274 * ..and if you can't take the strict
275 * types, you can specify one yourself.
277 * Or not use min/max at all, of course.
279 #define min_t(type,x,y) \
280 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
281 #define max_t(type,x,y) \
282 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
286 * container_of - cast a member of a structure out to the containing structure
287 * @ptr: the pointer to the member.
288 * @type: the type of the container struct this is embedded in.
289 * @member: the name of the member within the struct.
292 #define container_of(ptr, type, member) ({ \
293 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
294 (type *)( (char *)__mptr - offsetof(type,member) );})
297 * Check at compile time that something is of a particular type.
298 * Always evaluates to 1 so you may use it easily in comparisons.
300 #define typecheck(type,x) \
302 typeof(x) __dummy2; \
303 (void)(&__dummy == &__dummy2); \
308 * Check at compile time that 'function' is a certain type, or is a pointer
309 * to that type (needs to use typedef for the function type.)
311 #define typecheck_fn(type,function) \
312 ({ typeof(type) __tmp = function; \
316 #endif /* __KERNEL__ */
318 #define SI_LOAD_SHIFT 16
320 long uptime; /* Seconds since boot */
321 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
322 unsigned long totalram; /* Total usable main memory size */
323 unsigned long freeram; /* Available memory size */
324 unsigned long sharedram; /* Amount of shared memory */
325 unsigned long bufferram; /* Memory used by buffers */
326 unsigned long totalswap; /* Total swap space size */
327 unsigned long freeswap; /* swap space still available */
328 unsigned short procs; /* Number of current processes */
329 unsigned short pad; /* explicit padding for m68k */
330 unsigned long totalhigh; /* Total high memory size */
331 unsigned long freehigh; /* Available high memory size */
332 unsigned int mem_unit; /* Memory unit size in bytes */
333 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
336 /* Force a compilation error if condition is true */
337 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
339 /* Trap pasters of __FUNCTION__ at compile-time */
340 #define __FUNCTION__ (__func__)