kernel.h 8.7 KB

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  1. #ifndef _LINUX_KERNEL_H
  2. #define _LINUX_KERNEL_H
  3. /*
  4. * 'kernel.h' contains some often-used function prototypes etc
  5. */
  6. #ifdef __KERNEL__
  7. #include <stdarg.h>
  8. #include <linux/linkage.h>
  9. #include <linux/stddef.h>
  10. #include <linux/types.h>
  11. #include <linux/compiler.h>
  12. #include <linux/bitops.h>
  13. #include <asm/byteorder.h>
  14. #include <asm/bug.h>
  15. extern const char linux_banner[];
  16. #define INT_MAX ((int)(~0U>>1))
  17. #define INT_MIN (-INT_MAX - 1)
  18. #define UINT_MAX (~0U)
  19. #define LONG_MAX ((long)(~0UL>>1))
  20. #define LONG_MIN (-LONG_MAX - 1)
  21. #define ULONG_MAX (~0UL)
  22. #define STACK_MAGIC 0xdeadbeef
  23. #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  24. #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
  25. #define KERN_EMERG "<0>" /* system is unusable */
  26. #define KERN_ALERT "<1>" /* action must be taken immediately */
  27. #define KERN_CRIT "<2>" /* critical conditions */
  28. #define KERN_ERR "<3>" /* error conditions */
  29. #define KERN_WARNING "<4>" /* warning conditions */
  30. #define KERN_NOTICE "<5>" /* normal but significant condition */
  31. #define KERN_INFO "<6>" /* informational */
  32. #define KERN_DEBUG "<7>" /* debug-level messages */
  33. extern int console_printk[];
  34. #define console_loglevel (console_printk[0])
  35. #define default_message_loglevel (console_printk[1])
  36. #define minimum_console_loglevel (console_printk[2])
  37. #define default_console_loglevel (console_printk[3])
  38. struct completion;
  39. /**
  40. * might_sleep - annotation for functions that can sleep
  41. *
  42. * this macro will print a stack trace if it is executed in an atomic
  43. * context (spinlock, irq-handler, ...).
  44. *
  45. * This is a useful debugging help to be able to catch problems early and not
  46. * be biten later when the calling function happens to sleep when it is not
  47. * supposed to.
  48. */
  49. #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
  50. #define might_sleep() __might_sleep(__FILE__, __LINE__)
  51. #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
  52. void __might_sleep(char *file, int line);
  53. #else
  54. #define might_sleep() do {} while(0)
  55. #define might_sleep_if(cond) do {} while (0)
  56. #endif
  57. #define abs(x) ({ \
  58. int __x = (x); \
  59. (__x < 0) ? -__x : __x; \
  60. })
  61. #define labs(x) ({ \
  62. long __x = (x); \
  63. (__x < 0) ? -__x : __x; \
  64. })
  65. extern struct notifier_block *panic_notifier_list;
  66. extern long (*panic_blink)(long time);
  67. NORET_TYPE void panic(const char * fmt, ...)
  68. __attribute__ ((NORET_AND format (printf, 1, 2)));
  69. fastcall NORET_TYPE void do_exit(long error_code)
  70. ATTRIB_NORET;
  71. NORET_TYPE void complete_and_exit(struct completion *, long)
  72. ATTRIB_NORET;
  73. extern unsigned long simple_strtoul(const char *,char **,unsigned int);
  74. extern long simple_strtol(const char *,char **,unsigned int);
  75. extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
  76. extern long long simple_strtoll(const char *,char **,unsigned int);
  77. extern int sprintf(char * buf, const char * fmt, ...)
  78. __attribute__ ((format (printf, 2, 3)));
  79. extern int vsprintf(char *buf, const char *, va_list)
  80. __attribute__ ((format (printf, 2, 0)));
  81. extern int snprintf(char * buf, size_t size, const char * fmt, ...)
  82. __attribute__ ((format (printf, 3, 4)));
  83. extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
  84. __attribute__ ((format (printf, 3, 0)));
  85. extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
  86. __attribute__ ((format (printf, 3, 4)));
  87. extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
  88. __attribute__ ((format (printf, 3, 0)));
  89. extern int sscanf(const char *, const char *, ...)
  90. __attribute__ ((format (scanf, 2, 3)));
  91. extern int vsscanf(const char *, const char *, va_list)
  92. __attribute__ ((format (scanf, 2, 0)));
  93. extern int get_option(char **str, int *pint);
  94. extern char *get_options(const char *str, int nints, int *ints);
  95. extern unsigned long long memparse(char *ptr, char **retptr);
  96. extern int __kernel_text_address(unsigned long addr);
  97. extern int kernel_text_address(unsigned long addr);
  98. extern int session_of_pgrp(int pgrp);
  99. asmlinkage int vprintk(const char *fmt, va_list args)
  100. __attribute__ ((format (printf, 1, 0)));
  101. asmlinkage int printk(const char * fmt, ...)
  102. __attribute__ ((format (printf, 1, 2)));
  103. unsigned long int_sqrt(unsigned long);
  104. static inline int __attribute_pure__ long_log2(unsigned long x)
  105. {
  106. int r = 0;
  107. for (x >>= 1; x > 0; x >>= 1)
  108. r++;
  109. return r;
  110. }
  111. static inline unsigned long __attribute_const__ roundup_pow_of_two(unsigned long x)
  112. {
  113. return (1UL << fls(x - 1));
  114. }
  115. extern int printk_ratelimit(void);
  116. extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
  117. static inline void console_silent(void)
  118. {
  119. console_loglevel = 0;
  120. }
  121. static inline void console_verbose(void)
  122. {
  123. if (console_loglevel)
  124. console_loglevel = 15;
  125. }
  126. extern void bust_spinlocks(int yes);
  127. extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
  128. extern int panic_timeout;
  129. extern int panic_on_oops;
  130. extern int tainted;
  131. extern const char *print_tainted(void);
  132. extern void add_taint(unsigned);
  133. /* Values used for system_state */
  134. extern enum system_states {
  135. SYSTEM_BOOTING,
  136. SYSTEM_RUNNING,
  137. SYSTEM_HALT,
  138. SYSTEM_POWER_OFF,
  139. SYSTEM_RESTART,
  140. } system_state;
  141. #define TAINT_PROPRIETARY_MODULE (1<<0)
  142. #define TAINT_FORCED_MODULE (1<<1)
  143. #define TAINT_UNSAFE_SMP (1<<2)
  144. #define TAINT_FORCED_RMMOD (1<<3)
  145. #define TAINT_MACHINE_CHECK (1<<4)
  146. #define TAINT_BAD_PAGE (1<<5)
  147. extern void dump_stack(void);
  148. #ifdef DEBUG
  149. #define pr_debug(fmt,arg...) \
  150. printk(KERN_DEBUG fmt,##arg)
  151. #else
  152. #define pr_debug(fmt,arg...) \
  153. do { } while (0)
  154. #endif
  155. #define pr_info(fmt,arg...) \
  156. printk(KERN_INFO fmt,##arg)
  157. /*
  158. * Display an IP address in readable format.
  159. */
  160. #define NIPQUAD(addr) \
  161. ((unsigned char *)&addr)[0], \
  162. ((unsigned char *)&addr)[1], \
  163. ((unsigned char *)&addr)[2], \
  164. ((unsigned char *)&addr)[3]
  165. #define NIP6(addr) \
  166. ntohs((addr).s6_addr16[0]), \
  167. ntohs((addr).s6_addr16[1]), \
  168. ntohs((addr).s6_addr16[2]), \
  169. ntohs((addr).s6_addr16[3]), \
  170. ntohs((addr).s6_addr16[4]), \
  171. ntohs((addr).s6_addr16[5]), \
  172. ntohs((addr).s6_addr16[6]), \
  173. ntohs((addr).s6_addr16[7])
  174. #if defined(__LITTLE_ENDIAN)
  175. #define HIPQUAD(addr) \
  176. ((unsigned char *)&addr)[3], \
  177. ((unsigned char *)&addr)[2], \
  178. ((unsigned char *)&addr)[1], \
  179. ((unsigned char *)&addr)[0]
  180. #elif defined(__BIG_ENDIAN)
  181. #define HIPQUAD NIPQUAD
  182. #else
  183. #error "Please fix asm/byteorder.h"
  184. #endif /* __LITTLE_ENDIAN */
  185. /*
  186. * min()/max() macros that also do
  187. * strict type-checking.. See the
  188. * "unnecessary" pointer comparison.
  189. */
  190. #define min(x,y) ({ \
  191. typeof(x) _x = (x); \
  192. typeof(y) _y = (y); \
  193. (void) (&_x == &_y); \
  194. _x < _y ? _x : _y; })
  195. #define max(x,y) ({ \
  196. typeof(x) _x = (x); \
  197. typeof(y) _y = (y); \
  198. (void) (&_x == &_y); \
  199. _x > _y ? _x : _y; })
  200. /*
  201. * ..and if you can't take the strict
  202. * types, you can specify one yourself.
  203. *
  204. * Or not use min/max at all, of course.
  205. */
  206. #define min_t(type,x,y) \
  207. ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
  208. #define max_t(type,x,y) \
  209. ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
  210. /**
  211. * container_of - cast a member of a structure out to the containing structure
  212. *
  213. * @ptr: the pointer to the member.
  214. * @type: the type of the container struct this is embedded in.
  215. * @member: the name of the member within the struct.
  216. *
  217. */
  218. #define container_of(ptr, type, member) ({ \
  219. const typeof( ((type *)0)->member ) *__mptr = (ptr); \
  220. (type *)( (char *)__mptr - offsetof(type,member) );})
  221. /*
  222. * Check at compile time that something is of a particular type.
  223. * Always evaluates to 1 so you may use it easily in comparisons.
  224. */
  225. #define typecheck(type,x) \
  226. ({ type __dummy; \
  227. typeof(x) __dummy2; \
  228. (void)(&__dummy == &__dummy2); \
  229. 1; \
  230. })
  231. #endif /* __KERNEL__ */
  232. #define SI_LOAD_SHIFT 16
  233. struct sysinfo {
  234. long uptime; /* Seconds since boot */
  235. unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
  236. unsigned long totalram; /* Total usable main memory size */
  237. unsigned long freeram; /* Available memory size */
  238. unsigned long sharedram; /* Amount of shared memory */
  239. unsigned long bufferram; /* Memory used by buffers */
  240. unsigned long totalswap; /* Total swap space size */
  241. unsigned long freeswap; /* swap space still available */
  242. unsigned short procs; /* Number of current processes */
  243. unsigned short pad; /* explicit padding for m68k */
  244. unsigned long totalhigh; /* Total high memory size */
  245. unsigned long freehigh; /* Available high memory size */
  246. unsigned int mem_unit; /* Memory unit size in bytes */
  247. char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
  248. };
  249. extern void BUILD_BUG(void);
  250. #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
  251. #ifdef CONFIG_SYSCTL
  252. extern int randomize_va_space;
  253. #else
  254. #define randomize_va_space 1
  255. #endif
  256. /* Trap pasters of __FUNCTION__ at compile-time */
  257. #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
  258. #define __FUNCTION__ (__func__)
  259. #endif
  260. #endif