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)))
38 #define IS_ALIGNED(x,a) (((x) % ((typeof(x))(a))) == 0)
40 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
42 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
43 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
44 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
47 # include <asm/div64.h>
48 # define sector_div(a, b) do_div(a, b)
50 # define sector_div(n, b)( \
61 * upper_32_bits - return bits 32-63 of a number
62 * @n: the number we're accessing
64 * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress
65 * the "right shift count >= width of type" warning when that quantity is
68 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))
70 #define KERN_EMERG "<0>" /* system is unusable */
71 #define KERN_ALERT "<1>" /* action must be taken immediately */
72 #define KERN_CRIT "<2>" /* critical conditions */
73 #define KERN_ERR "<3>" /* error conditions */
74 #define KERN_WARNING "<4>" /* warning conditions */
75 #define KERN_NOTICE "<5>" /* normal but significant condition */
76 #define KERN_INFO "<6>" /* informational */
77 #define KERN_DEBUG "<7>" /* debug-level messages */
80 * Annotation for a "continued" line of log printout (only done after a
81 * line that had no enclosing \n). Only to be used by core/arch code
82 * during early bootup (a continued line is not SMP-safe otherwise).
86 extern int console_printk[];
88 #define console_loglevel (console_printk[0])
89 #define default_message_loglevel (console_printk[1])
90 #define minimum_console_loglevel (console_printk[2])
91 #define default_console_loglevel (console_printk[3])
98 * might_sleep - annotation for functions that can sleep
100 * this macro will print a stack trace if it is executed in an atomic
101 * context (spinlock, irq-handler, ...).
103 * This is a useful debugging help to be able to catch problems early and not
104 * be bitten later when the calling function happens to sleep when it is not
107 #ifdef CONFIG_PREEMPT_VOLUNTARY
108 extern int cond_resched(void);
109 # define might_resched() cond_resched()
111 # define might_resched() do { } while (0)
114 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
115 void __might_sleep(char *file, int line);
116 # define might_sleep() \
117 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
119 # define might_sleep() do { might_resched(); } while (0)
122 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
126 (__x < 0) ? -__x : __x; \
129 extern struct atomic_notifier_head panic_notifier_list;
130 extern long (*panic_blink)(long time);
131 NORET_TYPE void panic(const char * fmt, ...)
132 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
133 extern void oops_enter(void);
134 extern void oops_exit(void);
135 extern int oops_may_print(void);
136 fastcall NORET_TYPE void do_exit(long error_code)
138 NORET_TYPE void complete_and_exit(struct completion *, long)
140 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
141 extern long simple_strtol(const char *,char **,unsigned int);
142 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
143 extern long long simple_strtoll(const char *,char **,unsigned int);
144 extern int sprintf(char * buf, const char * fmt, ...)
145 __attribute__ ((format (printf, 2, 3)));
146 extern int vsprintf(char *buf, const char *, va_list)
147 __attribute__ ((format (printf, 2, 0)));
148 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
149 __attribute__ ((format (printf, 3, 4)));
150 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
151 __attribute__ ((format (printf, 3, 0)));
152 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
153 __attribute__ ((format (printf, 3, 4)));
154 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
155 __attribute__ ((format (printf, 3, 0)));
156 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
157 __attribute__ ((format (printf, 2, 3)));
158 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
160 extern int sscanf(const char *, const char *, ...)
161 __attribute__ ((format (scanf, 2, 3)));
162 extern int vsscanf(const char *, const char *, va_list)
163 __attribute__ ((format (scanf, 2, 0)));
165 extern int get_option(char **str, int *pint);
166 extern char *get_options(const char *str, int nints, int *ints);
167 extern unsigned long long memparse(char *ptr, char **retptr);
169 extern int core_kernel_text(unsigned long addr);
170 extern int __kernel_text_address(unsigned long addr);
171 extern int kernel_text_address(unsigned long addr);
173 extern struct pid *session_of_pgrp(struct pid *pgrp);
175 extern void dump_thread(struct pt_regs *regs, struct user *dump);
178 asmlinkage int vprintk(const char *fmt, va_list args)
179 __attribute__ ((format (printf, 1, 0)));
180 asmlinkage int printk(const char * fmt, ...)
181 __attribute__ ((format (printf, 1, 2))) __cold;
182 extern int log_buf_get_len(void);
183 extern int log_buf_read(int idx);
184 extern int log_buf_copy(char *dest, int idx, int len);
186 static inline int vprintk(const char *s, va_list args)
187 __attribute__ ((format (printf, 1, 0)));
188 static inline int vprintk(const char *s, va_list args) { return 0; }
189 static inline int printk(const char *s, ...)
190 __attribute__ ((format (printf, 1, 2)));
191 static inline int __cold printk(const char *s, ...) { return 0; }
192 static inline int log_buf_get_len(void) { return 0; }
193 static inline int log_buf_read(int idx) { return 0; }
194 static inline int log_buf_copy(char *dest, int idx, int len) { return 0; }
197 unsigned long int_sqrt(unsigned long);
199 extern int printk_ratelimit(void);
200 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
201 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
202 unsigned int interval_msec);
204 static inline void console_silent(void)
206 console_loglevel = 0;
209 static inline void console_verbose(void)
211 if (console_loglevel)
212 console_loglevel = 15;
215 extern void bust_spinlocks(int yes);
216 extern void wake_up_klogd(void);
217 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
218 extern int panic_timeout;
219 extern int panic_on_oops;
220 extern int panic_on_unrecovered_nmi;
222 extern const char *print_tainted(void);
223 extern void add_taint(unsigned);
225 /* Values used for system_state */
226 extern enum system_states {
235 #define TAINT_PROPRIETARY_MODULE (1<<0)
236 #define TAINT_FORCED_MODULE (1<<1)
237 #define TAINT_UNSAFE_SMP (1<<2)
238 #define TAINT_FORCED_RMMOD (1<<3)
239 #define TAINT_MACHINE_CHECK (1<<4)
240 #define TAINT_BAD_PAGE (1<<5)
241 #define TAINT_USER (1<<6)
242 #define TAINT_DIE (1<<7)
244 extern void dump_stack(void) __cold;
251 extern void hex_dump_to_buffer(const void *buf, size_t len,
252 int rowsize, int groupsize,
253 char *linebuf, size_t linebuflen, bool ascii);
254 extern void print_hex_dump(const char *level, const char *prefix_str,
255 int prefix_type, int rowsize, int groupsize,
256 const void *buf, size_t len, bool ascii);
257 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
258 const void *buf, size_t len);
259 #define hex_asc(x) "0123456789abcdef"[x]
261 #define pr_emerg(fmt, arg...) \
262 printk(KERN_EMERG fmt, ##arg)
263 #define pr_alert(fmt, arg...) \
264 printk(KERN_ALERT fmt, ##arg)
265 #define pr_crit(fmt, arg...) \
266 printk(KERN_CRIT fmt, ##arg)
267 #define pr_err(fmt, arg...) \
268 printk(KERN_ERR fmt, ##arg)
269 #define pr_warning(fmt, arg...) \
270 printk(KERN_WARNING fmt, ##arg)
271 #define pr_notice(fmt, arg...) \
272 printk(KERN_NOTICE fmt, ##arg)
273 #define pr_info(fmt, arg...) \
274 printk(KERN_INFO fmt, ##arg)
277 /* If you are writing a driver, please use dev_dbg instead */
278 #define pr_debug(fmt, arg...) \
279 printk(KERN_DEBUG fmt, ##arg)
281 static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...)
288 * Display an IP address in readable format.
291 #define NIPQUAD(addr) \
292 ((unsigned char *)&addr)[0], \
293 ((unsigned char *)&addr)[1], \
294 ((unsigned char *)&addr)[2], \
295 ((unsigned char *)&addr)[3]
296 #define NIPQUAD_FMT "%u.%u.%u.%u"
299 ntohs((addr).s6_addr16[0]), \
300 ntohs((addr).s6_addr16[1]), \
301 ntohs((addr).s6_addr16[2]), \
302 ntohs((addr).s6_addr16[3]), \
303 ntohs((addr).s6_addr16[4]), \
304 ntohs((addr).s6_addr16[5]), \
305 ntohs((addr).s6_addr16[6]), \
306 ntohs((addr).s6_addr16[7])
307 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
308 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
310 #if defined(__LITTLE_ENDIAN)
311 #define HIPQUAD(addr) \
312 ((unsigned char *)&addr)[3], \
313 ((unsigned char *)&addr)[2], \
314 ((unsigned char *)&addr)[1], \
315 ((unsigned char *)&addr)[0]
316 #elif defined(__BIG_ENDIAN)
317 #define HIPQUAD NIPQUAD
319 #error "Please fix asm/byteorder.h"
320 #endif /* __LITTLE_ENDIAN */
323 * min()/max() macros that also do
324 * strict type-checking.. See the
325 * "unnecessary" pointer comparison.
327 #define min(x,y) ({ \
328 typeof(x) _x = (x); \
329 typeof(y) _y = (y); \
330 (void) (&_x == &_y); \
331 _x < _y ? _x : _y; })
333 #define max(x,y) ({ \
334 typeof(x) _x = (x); \
335 typeof(y) _y = (y); \
336 (void) (&_x == &_y); \
337 _x > _y ? _x : _y; })
340 * ..and if you can't take the strict
341 * types, you can specify one yourself.
343 * Or not use min/max at all, of course.
345 #define min_t(type,x,y) \
346 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
347 #define max_t(type,x,y) \
348 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
352 * container_of - cast a member of a structure out to the containing structure
353 * @ptr: the pointer to the member.
354 * @type: the type of the container struct this is embedded in.
355 * @member: the name of the member within the struct.
358 #define container_of(ptr, type, member) ({ \
359 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
360 (type *)( (char *)__mptr - offsetof(type,member) );})
363 * Check at compile time that something is of a particular type.
364 * Always evaluates to 1 so you may use it easily in comparisons.
366 #define typecheck(type,x) \
368 typeof(x) __dummy2; \
369 (void)(&__dummy == &__dummy2); \
374 * Check at compile time that 'function' is a certain type, or is a pointer
375 * to that type (needs to use typedef for the function type.)
377 #define typecheck_fn(type,function) \
378 ({ typeof(type) __tmp = function; \
383 extern int do_sysinfo(struct sysinfo *info);
385 #endif /* __KERNEL__ */
387 #define SI_LOAD_SHIFT 16
389 long uptime; /* Seconds since boot */
390 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
391 unsigned long totalram; /* Total usable main memory size */
392 unsigned long freeram; /* Available memory size */
393 unsigned long sharedram; /* Amount of shared memory */
394 unsigned long bufferram; /* Memory used by buffers */
395 unsigned long totalswap; /* Total swap space size */
396 unsigned long freeswap; /* swap space still available */
397 unsigned short procs; /* Number of current processes */
398 unsigned short pad; /* explicit padding for m68k */
399 unsigned long totalhigh; /* Total high memory size */
400 unsigned long freehigh; /* Available high memory size */
401 unsigned int mem_unit; /* Memory unit size in bytes */
402 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
405 /* Force a compilation error if condition is true */
406 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
408 /* Force a compilation error if condition is true, but also produce a
409 result (of value 0 and type size_t), so the expression can be used
410 e.g. in a structure initializer (or where-ever else comma expressions
411 aren't permitted). */
412 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
414 /* Trap pasters of __FUNCTION__ at compile-time */
415 #define __FUNCTION__ (__func__)
417 /* This helps us to avoid #ifdef CONFIG_NUMA */