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 <linux/log2.h>
17 #include <asm/byteorder.h>
20 extern const char linux_banner[];
21 extern const char linux_proc_banner[];
23 #define INT_MAX ((int)(~0U>>1))
24 #define INT_MIN (-INT_MAX - 1)
25 #define UINT_MAX (~0U)
26 #define LONG_MAX ((long)(~0UL>>1))
27 #define LONG_MIN (-LONG_MAX - 1)
28 #define ULONG_MAX (~0UL)
29 #define LLONG_MAX ((long long)(~0ULL>>1))
30 #define LLONG_MIN (-LLONG_MAX - 1)
31 #define ULLONG_MAX (~0ULL)
33 #define STACK_MAGIC 0xdeadbeef
35 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
36 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
37 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
39 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
41 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
42 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
43 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
46 # include <asm/div64.h>
47 # define sector_div(a, b) do_div(a, b)
49 # define sector_div(n, b)( \
60 * upper_32_bits - return bits 32-63 of a number
61 * @n: the number we're accessing
63 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
64 * the "right shift count >= width of type" warning when that quantity is
67 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
69 #define KERN_EMERG "<0>" /* system is unusable */
70 #define KERN_ALERT "<1>" /* action must be taken immediately */
71 #define KERN_CRIT "<2>" /* critical conditions */
72 #define KERN_ERR "<3>" /* error conditions */
73 #define KERN_WARNING "<4>" /* warning conditions */
74 #define KERN_NOTICE "<5>" /* normal but significant condition */
75 #define KERN_INFO "<6>" /* informational */
76 #define KERN_DEBUG "<7>" /* debug-level messages */
78 extern int console_printk[];
80 #define console_loglevel (console_printk[0])
81 #define default_message_loglevel (console_printk[1])
82 #define minimum_console_loglevel (console_printk[2])
83 #define default_console_loglevel (console_printk[3])
90 * might_sleep - annotation for functions that can sleep
92 * this macro will print a stack trace if it is executed in an atomic
93 * context (spinlock, irq-handler, ...).
95 * This is a useful debugging help to be able to catch problems early and not
96 * be bitten later when the calling function happens to sleep when it is not
99 #ifdef CONFIG_PREEMPT_VOLUNTARY
100 extern int cond_resched(void);
101 # define might_resched() cond_resched()
103 # define might_resched() do { } while (0)
106 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
107 void __might_sleep(char *file, int line);
108 # define might_sleep() \
109 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
111 # define might_sleep() do { might_resched(); } while (0)
114 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
118 (__x < 0) ? -__x : __x; \
121 extern struct atomic_notifier_head panic_notifier_list;
122 extern long (*panic_blink)(long time);
123 NORET_TYPE void panic(const char * fmt, ...)
124 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
125 extern void oops_enter(void);
126 extern void oops_exit(void);
127 extern int oops_may_print(void);
128 fastcall NORET_TYPE void do_exit(long error_code)
130 NORET_TYPE void complete_and_exit(struct completion *, long)
132 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
133 extern long simple_strtol(const char *,char **,unsigned int);
134 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
135 extern long long simple_strtoll(const char *,char **,unsigned int);
136 extern int sprintf(char * buf, const char * fmt, ...)
137 __attribute__ ((format (printf, 2, 3)));
138 extern int vsprintf(char *buf, const char *, va_list)
139 __attribute__ ((format (printf, 2, 0)));
140 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
141 __attribute__ ((format (printf, 3, 4)));
142 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
143 __attribute__ ((format (printf, 3, 0)));
144 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
145 __attribute__ ((format (printf, 3, 4)));
146 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
147 __attribute__ ((format (printf, 3, 0)));
148 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
149 __attribute__ ((format (printf, 2, 3)));
150 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
152 extern int sscanf(const char *, const char *, ...)
153 __attribute__ ((format (scanf, 2, 3)));
154 extern int vsscanf(const char *, const char *, va_list)
155 __attribute__ ((format (scanf, 2, 0)));
157 extern int get_option(char **str, int *pint);
158 extern char *get_options(const char *str, int nints, int *ints);
159 extern unsigned long long memparse(char *ptr, char **retptr);
161 extern int core_kernel_text(unsigned long addr);
162 extern int __kernel_text_address(unsigned long addr);
163 extern int kernel_text_address(unsigned long addr);
165 extern struct pid *session_of_pgrp(struct pid *pgrp);
167 extern void dump_thread(struct pt_regs *regs, struct user *dump);
170 asmlinkage int vprintk(const char *fmt, va_list args)
171 __attribute__ ((format (printf, 1, 0)));
172 asmlinkage int printk(const char * fmt, ...)
173 __attribute__ ((format (printf, 1, 2))) __cold;
175 static inline int vprintk(const char *s, va_list args)
176 __attribute__ ((format (printf, 1, 0)));
177 static inline int vprintk(const char *s, va_list args) { return 0; }
178 static inline int printk(const char *s, ...)
179 __attribute__ ((format (printf, 1, 2)));
180 static inline int __cold printk(const char *s, ...) { return 0; }
183 unsigned long int_sqrt(unsigned long);
185 extern int printk_ratelimit(void);
186 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
187 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
188 unsigned int interval_msec);
190 static inline void console_silent(void)
192 console_loglevel = 0;
195 static inline void console_verbose(void)
197 if (console_loglevel)
198 console_loglevel = 15;
201 extern void bust_spinlocks(int yes);
202 extern void wake_up_klogd(void);
203 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
204 extern int panic_timeout;
205 extern int panic_on_oops;
206 extern int panic_on_unrecovered_nmi;
208 extern const char *print_tainted(void);
209 extern void add_taint(unsigned);
211 /* Values used for system_state */
212 extern enum system_states {
221 #define TAINT_PROPRIETARY_MODULE (1<<0)
222 #define TAINT_FORCED_MODULE (1<<1)
223 #define TAINT_UNSAFE_SMP (1<<2)
224 #define TAINT_FORCED_RMMOD (1<<3)
225 #define TAINT_MACHINE_CHECK (1<<4)
226 #define TAINT_BAD_PAGE (1<<5)
227 #define TAINT_USER (1<<6)
228 #define TAINT_DIE (1<<7)
230 extern void dump_stack(void) __cold;
237 extern void hex_dump_to_buffer(const void *buf, size_t len,
238 int rowsize, int groupsize,
239 char *linebuf, size_t linebuflen, bool ascii);
240 extern void print_hex_dump(const char *level, const char *prefix_str,
241 int prefix_type, int rowsize, int groupsize,
242 const void *buf, size_t len, bool ascii);
243 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
244 const void *buf, size_t len);
245 #define hex_asc(x) "0123456789abcdef"[x]
248 /* If you are writing a driver, please use dev_dbg instead */
249 #define pr_debug(fmt,arg...) \
250 printk(KERN_DEBUG fmt,##arg)
252 static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...)
258 #define pr_info(fmt,arg...) \
259 printk(KERN_INFO fmt,##arg)
262 * Display an IP address in readable format.
265 #define NIPQUAD(addr) \
266 ((unsigned char *)&addr)[0], \
267 ((unsigned char *)&addr)[1], \
268 ((unsigned char *)&addr)[2], \
269 ((unsigned char *)&addr)[3]
270 #define NIPQUAD_FMT "%u.%u.%u.%u"
273 ntohs((addr).s6_addr16[0]), \
274 ntohs((addr).s6_addr16[1]), \
275 ntohs((addr).s6_addr16[2]), \
276 ntohs((addr).s6_addr16[3]), \
277 ntohs((addr).s6_addr16[4]), \
278 ntohs((addr).s6_addr16[5]), \
279 ntohs((addr).s6_addr16[6]), \
280 ntohs((addr).s6_addr16[7])
281 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
282 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
284 #if defined(__LITTLE_ENDIAN)
285 #define HIPQUAD(addr) \
286 ((unsigned char *)&addr)[3], \
287 ((unsigned char *)&addr)[2], \
288 ((unsigned char *)&addr)[1], \
289 ((unsigned char *)&addr)[0]
290 #elif defined(__BIG_ENDIAN)
291 #define HIPQUAD NIPQUAD
293 #error "Please fix asm/byteorder.h"
294 #endif /* __LITTLE_ENDIAN */
297 * min()/max() macros that also do
298 * strict type-checking.. See the
299 * "unnecessary" pointer comparison.
301 #define min(x,y) ({ \
302 typeof(x) _x = (x); \
303 typeof(y) _y = (y); \
304 (void) (&_x == &_y); \
305 _x < _y ? _x : _y; })
307 #define max(x,y) ({ \
308 typeof(x) _x = (x); \
309 typeof(y) _y = (y); \
310 (void) (&_x == &_y); \
311 _x > _y ? _x : _y; })
314 * ..and if you can't take the strict
315 * types, you can specify one yourself.
317 * Or not use min/max at all, of course.
319 #define min_t(type,x,y) \
320 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
321 #define max_t(type,x,y) \
322 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
326 * container_of - cast a member of a structure out to the containing structure
327 * @ptr: the pointer to the member.
328 * @type: the type of the container struct this is embedded in.
329 * @member: the name of the member within the struct.
332 #define container_of(ptr, type, member) ({ \
333 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
334 (type *)( (char *)__mptr - offsetof(type,member) );})
337 * Check at compile time that something is of a particular type.
338 * Always evaluates to 1 so you may use it easily in comparisons.
340 #define typecheck(type,x) \
342 typeof(x) __dummy2; \
343 (void)(&__dummy == &__dummy2); \
348 * Check at compile time that 'function' is a certain type, or is a pointer
349 * to that type (needs to use typedef for the function type.)
351 #define typecheck_fn(type,function) \
352 ({ typeof(type) __tmp = function; \
357 extern int do_sysinfo(struct sysinfo *info);
359 #endif /* __KERNEL__ */
361 #define SI_LOAD_SHIFT 16
363 long uptime; /* Seconds since boot */
364 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
365 unsigned long totalram; /* Total usable main memory size */
366 unsigned long freeram; /* Available memory size */
367 unsigned long sharedram; /* Amount of shared memory */
368 unsigned long bufferram; /* Memory used by buffers */
369 unsigned long totalswap; /* Total swap space size */
370 unsigned long freeswap; /* swap space still available */
371 unsigned short procs; /* Number of current processes */
372 unsigned short pad; /* explicit padding for m68k */
373 unsigned long totalhigh; /* Total high memory size */
374 unsigned long freehigh; /* Available high memory size */
375 unsigned int mem_unit; /* Memory unit size in bytes */
376 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
379 /* Force a compilation error if condition is true */
380 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
382 /* Force a compilation error if condition is true, but also produce a
383 result (of value 0 and type size_t), so the expression can be used
384 e.g. in a structure initializer (or where-ever else comma expressions
385 aren't permitted). */
386 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
388 /* Trap pasters of __FUNCTION__ at compile-time */
389 #define __FUNCTION__ (__func__)
391 /* This helps us to avoid #ifdef CONFIG_NUMA */