include/linux/kernel.h

   1 #ifndef _LINUX_KERNEL_H
   2 #define _LINUX_KERNEL_H
   3
   4 /*
   5  * 'kernel.h' contains some often-used function prototypes etc
   6  */
   7
   8 #ifdef __KERNEL__
   9
  10 #include <stdarg.h>
  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>
  17 #include <asm/bug.h>
  18
  19 #define INT_MAX         ((int)(~0U>>1))
  20 #define INT_MIN         (-INT_MAX - 1)
  21 #define UINT_MAX        (~0U)
  22 #define LONG_MAX        ((long)(~0UL>>1))
  23 #define LONG_MIN        (-LONG_MAX - 1)
  24 #define ULONG_MAX       (~0UL)
  25
  26 #define STACK_MAGIC     0xdeadbeef
  27
  28 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  29 #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
  30
  31 #define KERN_EMERG      "<0>"   /* system is unusable                   */
  32 #define KERN_ALERT      "<1>"   /* action must be taken immediately     */
  33 #define KERN_CRIT       "<2>"   /* critical conditions                  */
  34 #define KERN_ERR        "<3>"   /* error conditions                     */
  35 #define KERN_WARNING    "<4>"   /* warning conditions                   */
  36 #define KERN_NOTICE     "<5>"   /* normal but significant condition     */
  37 #define KERN_INFO       "<6>"   /* informational                        */
  38 #define KERN_DEBUG      "<7>"   /* debug-level messages                 */
  39
  40 extern int console_printk[];
  41
  42 #define console_loglevel (console_printk[0])
  43 #define default_message_loglevel (console_printk[1])
  44 #define minimum_console_loglevel (console_printk[2])
  45 #define default_console_loglevel (console_printk[3])
  46
  47 struct completion;
  48
  49 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
  50 void __might_sleep(char *file, int line);
  51 #define might_sleep() __might_sleep(__FILE__, __LINE__)
  52 #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
  53 #else
  54 #define might_sleep() do {} while(0)
  55 #define might_sleep_if(cond) do {} while (0)
  56 #endif
  57
  58 #define abs(x) ({                               \
  59                 int __x = (x);                  \
  60                 (__x < 0) ? -__x : __x;         \
  61         })
  62
  63 #define labs(x) ({                              \
  64                 long __x = (x);                 \
  65                 (__x < 0) ? -__x : __x;         \
  66         })
  67
  68 extern struct notifier_block *panic_notifier_list;
  69 NORET_TYPE void panic(const char * fmt, ...)
  70         __attribute__ ((NORET_AND format (printf, 1, 2)));
  71 asmlinkage NORET_TYPE void do_exit(long error_code)
  72         ATTRIB_NORET;
  73 NORET_TYPE void complete_and_exit(struct completion *, long)
  74         ATTRIB_NORET;
  75 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
  76 extern long simple_strtol(const char *,char **,unsigned int);
  77 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
  78 extern long long simple_strtoll(const char *,char **,unsigned int);
  79 extern int sprintf(char * buf, const char * fmt, ...)
  80         __attribute__ ((format (printf, 2, 3)));
  81 extern int vsprintf(char *buf, const char *, va_list);
  82 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
  83         __attribute__ ((format (printf, 3, 4)));
  84 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
  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
  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
  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
  97 extern int __kernel_text_address(unsigned long addr);
  98 extern int kernel_text_address(unsigned long addr);
  99 extern int session_of_pgrp(int pgrp);
 100
 101 asmlinkage int vprintk(const char *fmt, va_list args);
 102 asmlinkage int printk(const char * fmt, ...)
 103         __attribute__ ((format (printf, 1, 2)));
 104
 105 unsigned long int_sqrt(unsigned long);
 106
 107 static inline int __attribute_pure__ long_log2(unsigned long x)
 108 {
 109         int r = 0;
 110         for (x >>= 1; x > 0; x >>= 1)
 111                 r++;
 112         return r;
 113 }
 114
 115 static inline unsigned long __attribute_const__ roundup_pow_of_two(unsigned long x)
 116 {
 117         return (1UL << fls(x - 1));
 118 }
 119
 120 extern int printk_ratelimit(void);
 121 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
 122
 123 static inline void console_silent(void)
 124 {
 125         console_loglevel = 0;
 126 }
 127
 128 static inline void console_verbose(void)
 129 {
 130         if (console_loglevel)
 131                 console_loglevel = 15;
 132 }
 133
 134 extern void bust_spinlocks(int yes);
 135 extern int oops_in_progress;            /* If set, an oops, panic(), BUG() or die() is in progress */
 136 extern int panic_on_oops;
 137 extern int tainted;
 138 extern const char *print_tainted(void);
 139
 140 /* Values used for system_state */
 141 extern enum system_states {
 142         SYSTEM_BOOTING,
 143         SYSTEM_RUNNING,
 144         SYSTEM_HALT,
 145         SYSTEM_POWER_OFF,
 146         SYSTEM_RESTART,
 147 } system_state;
 148
 149 #define TAINT_PROPRIETARY_MODULE        (1<<0)
 150 #define TAINT_FORCED_MODULE             (1<<1)
 151 #define TAINT_UNSAFE_SMP                (1<<2)
 152 #define TAINT_FORCED_RMMOD              (1<<3)
 153
 154 extern void dump_stack(void);
 155
 156 #ifdef DEBUG
 157 #define pr_debug(fmt,arg...) \
 158         printk(KERN_DEBUG fmt,##arg)
 159 #else
 160 #define pr_debug(fmt,arg...) \
 161         do { } while (0)
 162 #endif
 163
 164 #define pr_info(fmt,arg...) \
 165         printk(KERN_INFO fmt,##arg)
 166
 167 /*
 168  *      Display an IP address in readable format.
 169  */
 170
 171 #define NIPQUAD(addr) \
 172         ((unsigned char *)&addr)[0], \
 173         ((unsigned char *)&addr)[1], \
 174         ((unsigned char *)&addr)[2], \
 175         ((unsigned char *)&addr)[3]
 176
 177 #define NIP6(addr) \
 178         ntohs((addr).s6_addr16[0]), \
 179         ntohs((addr).s6_addr16[1]), \
 180         ntohs((addr).s6_addr16[2]), \
 181         ntohs((addr).s6_addr16[3]), \
 182         ntohs((addr).s6_addr16[4]), \
 183         ntohs((addr).s6_addr16[5]), \
 184         ntohs((addr).s6_addr16[6]), \
 185         ntohs((addr).s6_addr16[7])
 186
 187 #if defined(__LITTLE_ENDIAN)
 188 #define HIPQUAD(addr) \
 189         ((unsigned char *)&addr)[3], \
 190         ((unsigned char *)&addr)[2], \
 191         ((unsigned char *)&addr)[1], \
 192         ((unsigned char *)&addr)[0]
 193 #elif defined(__BIG_ENDIAN)
 194 #define HIPQUAD NIPQUAD
 195 #else
 196 #error "Please fix asm/byteorder.h"
 197 #endif /* __LITTLE_ENDIAN */
 198
 199 /*
 200  * min()/max() macros that also do
 201  * strict type-checking.. See the
 202  * "unnecessary" pointer comparison.
 203  */
 204 #define min(x,y) ({ \
 205         typeof(x) _x = (x);     \
 206         typeof(y) _y = (y);     \
 207         (void) (&_x == &_y);            \
 208         _x < _y ? _x : _y; })
 209
 210 #define max(x,y) ({ \
 211         typeof(x) _x = (x);     \
 212         typeof(y) _y = (y);     \
 213         (void) (&_x == &_y);            \
 214         _x > _y ? _x : _y; })
 215
 216 /*
 217  * ..and if you can't take the strict
 218  * types, you can specify one yourself.
 219  *
 220  * Or not use min/max at all, of course.
 221  */
 222 #define min_t(type,x,y) \
 223         ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
 224 #define max_t(type,x,y) \
 225         ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
 226
 227
 228 /**
 229  * container_of - cast a member of a structure out to the containing structure
 230  *
 231  * @ptr:        the pointer to the member.
 232  * @type:       the type of the container struct this is embedded in.
 233  * @member:     the name of the member within the struct.
 234  *
 235  */
 236 #define container_of(ptr, type, member) ({                      \
 237         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
 238         (type *)( (char *)__mptr - offsetof(type,member) );})
 239
 240 /*
 241  * Check at compile time that something is of a particular type.
 242  * Always evaluates to 1 so you may use it easily in comparisons.
 243  */
 244 #define typecheck(type,x) \
 245 ({      type __dummy; \
 246         typeof(x) __dummy2; \
 247         (void)(&__dummy == &__dummy2); \
 248         1; \
 249 })
 250
 251 #endif /* __KERNEL__ */
 252
 253 #define SI_LOAD_SHIFT   16
 254 struct sysinfo {
 255         long uptime;                    /* Seconds since boot */
 256         unsigned long loads[3];         /* 1, 5, and 15 minute load averages */
 257         unsigned long totalram;         /* Total usable main memory size */
 258         unsigned long freeram;          /* Available memory size */
 259         unsigned long sharedram;        /* Amount of shared memory */
 260         unsigned long bufferram;        /* Memory used by buffers */
 261         unsigned long totalswap;        /* Total swap space size */
 262         unsigned long freeswap;         /* swap space still available */
 263         unsigned short procs;           /* Number of current processes */
 264         unsigned short pad;             /* explicit padding for m68k */
 265         unsigned long totalhigh;        /* Total high memory size */
 266         unsigned long freehigh;         /* Available high memory size */
 267         unsigned int mem_unit;          /* Memory unit size in bytes */
 268         char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
 269 };
 270
 271 extern void BUILD_BUG(void);
 272 #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
 273
 274 /* Trap pasters of __FUNCTION__ at compile-time */
 275 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
 276 #define __FUNCTION__ (__func__)
 277 #endif
 278
 279 #endif