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 <asm/byteorder.h>
  16
  17 /* Optimization barrier */
  18 /* The "volatile" is due to gcc bugs */
  19 #define barrier() __asm__ __volatile__("": : :"memory")
  20
  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
  28 #define STACK_MAGIC     0xdeadbeef
  29
  30 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  31
  32 #define KERN_EMERG      "<0>"   /* system is unusable                   */
  33 #define KERN_ALERT      "<1>"   /* action must be taken immediately     */
  34 #define KERN_CRIT       "<2>"   /* critical conditions                  */
  35 #define KERN_ERR        "<3>"   /* error conditions                     */
  36 #define KERN_WARNING    "<4>"   /* warning conditions                   */
  37 #define KERN_NOTICE     "<5>"   /* normal but significant condition     */
  38 #define KERN_INFO       "<6>"   /* informational                        */
  39 #define KERN_DEBUG      "<7>"   /* debug-level messages                 */
  40
  41 struct completion;
  42
  43 #ifdef CONFIG_DEBUG_KERNEL
  44 void __might_sleep(char *file, int line);
  45 #define might_sleep() __might_sleep(__FILE__, __LINE__)
  46 #else
  47 #define might_sleep() do {} while(0)
  48 #endif
  49
  50 extern struct notifier_block *panic_notifier_list;
  51 NORET_TYPE void panic(const char * fmt, ...)
  52         __attribute__ ((NORET_AND format (printf, 1, 2)));
  53 asmlinkage NORET_TYPE void do_exit(long error_code)
  54         ATTRIB_NORET;
  55 NORET_TYPE void complete_and_exit(struct completion *, long)
  56         ATTRIB_NORET;
  57 extern int abs(int);
  58 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
  59 extern long simple_strtol(const char *,char **,unsigned int);
  60 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
  61 extern long long simple_strtoll(const char *,char **,unsigned int);
  62 extern int sprintf(char * buf, const char * fmt, ...)
  63         __attribute__ ((format (printf, 2, 3)));
  64 extern int vsprintf(char *buf, const char *, va_list);
  65 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
  66         __attribute__ ((format (printf, 3, 4)));
  67 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
  68
  69 extern int sscanf(const char *, const char *, ...)
  70         __attribute__ ((format (scanf,2,3)));
  71 extern int vsscanf(const char *, const char *, va_list);
  72
  73 extern int get_option(char **str, int *pint);
  74 extern char *get_options(char *str, int nints, int *ints);
  75 extern unsigned long long memparse(char *ptr, char **retptr);
  76 extern void dev_probe_lock(void);
  77 extern void dev_probe_unlock(void);
  78
  79 extern int session_of_pgrp(int pgrp);
  80
  81 asmlinkage int printk(const char * fmt, ...)
  82         __attribute__ ((format (printf, 1, 2)));
  83
  84 extern int console_loglevel;
  85
  86 static inline void console_silent(void)
  87 {
  88         console_loglevel = 0;
  89 }
  90
  91 static inline void console_verbose(void)
  92 {
  93         if (console_loglevel)
  94                 console_loglevel = 15;
  95 }
  96
  97 extern void bust_spinlocks(int yes);
  98 extern int oops_in_progress;            /* If set, an oops, panic(), BUG() or die() is in progress */
  99
 100 extern int tainted;
 101 extern const char *print_tainted(void);
 102 #define TAINT_PROPRIETORY_MODULE        (1<<0)
 103 #define TAINT_FORCED_MODULE             (1<<1)
 104 #define TAINT_UNSAFE_SMP                (1<<2)
 105 #define TAINT_FORCED_RMMOD              (1<<3)
 106
 107 extern void dump_stack(void);
 108
 109 #ifdef DEBUG
 110 #define pr_debug(fmt,arg...) \
 111         printk(KERN_DEBUG fmt,##arg)
 112 #else
 113 #define pr_debug(fmt,arg...) \
 114         do { } while (0)
 115 #endif
 116
 117 #define pr_info(fmt,arg...) \
 118         printk(KERN_INFO fmt,##arg)
 119
 120 /*
 121  *      Display an IP address in readable format.
 122  */
 123
 124 #define NIPQUAD(addr) \
 125         ((unsigned char *)&addr)[0], \
 126         ((unsigned char *)&addr)[1], \
 127         ((unsigned char *)&addr)[2], \
 128         ((unsigned char *)&addr)[3]
 129
 130 #if defined(__LITTLE_ENDIAN)
 131 #define HIPQUAD(addr) \
 132         ((unsigned char *)&addr)[3], \
 133         ((unsigned char *)&addr)[2], \
 134         ((unsigned char *)&addr)[1], \
 135         ((unsigned char *)&addr)[0]
 136 #elif defined(__BIG_ENDIAN)
 137 #define HIPQUAD NIPQUAD
 138 #else
 139 #error "Please fix asm/byteorder.h"
 140 #endif /* __LITTLE_ENDIAN */
 141
 142 /*
 143  * min()/max() macros that also do
 144  * strict type-checking.. See the
 145  * "unnecessary" pointer comparison.
 146  */
 147 #define min(x,y) ({ \
 148         const typeof(x) _x = (x);       \
 149         const typeof(y) _y = (y);       \
 150         (void) (&_x == &_y);            \
 151         _x < _y ? _x : _y; })
 152
 153 #define max(x,y) ({ \
 154         const typeof(x) _x = (x);       \
 155         const typeof(y) _y = (y);       \
 156         (void) (&_x == &_y);            \
 157         _x > _y ? _x : _y; })
 158
 159 /*
 160  * ..and if you can't take the strict
 161  * types, you can specify one yourself.
 162  *
 163  * Or not use min/max at all, of course.
 164  */
 165 #define min_t(type,x,y) \
 166         ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
 167 #define max_t(type,x,y) \
 168         ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
 169
 170
 171 /**
 172  * container_of - cast a member of a structure out to the containing structure
 173  *
 174  * @ptr:        the pointer to the member.
 175  * @type:       the type of the container struct this is embedded in.
 176  * @member:     the name of the member within the struct.
 177  *
 178  */
 179 #define container_of(ptr, type, member) ({                      \
 180         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
 181         (type *)( (char *)__mptr - offsetof(type,member) );})
 182
 183 #endif /* __KERNEL__ */
 184
 185 #define SI_LOAD_SHIFT   16
 186 struct sysinfo {
 187         long uptime;                    /* Seconds since boot */
 188         unsigned long loads[3];         /* 1, 5, and 15 minute load averages */
 189         unsigned long totalram;         /* Total usable main memory size */
 190         unsigned long freeram;          /* Available memory size */
 191         unsigned long sharedram;        /* Amount of shared memory */
 192         unsigned long bufferram;        /* Memory used by buffers */
 193         unsigned long totalswap;        /* Total swap space size */
 194         unsigned long freeswap;         /* swap space still available */
 195         unsigned short procs;           /* Number of current processes */
 196         unsigned short pad;             /* explicit padding for m68k */
 197         unsigned long totalhigh;        /* Total high memory size */
 198         unsigned long freehigh;         /* Available high memory size */
 199         unsigned int mem_unit;          /* Memory unit size in bytes */
 200         char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
 201 };
 202
 203 #define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0)
 204 #define WARN_ON(condition) do { \
 205         if (unlikely((condition)!=0)) { \
 206                 printk("Badness in %s at %s:%d\n", __FUNCTION__, __FILE__, __LINE__); \
 207                 dump_stack(); \
 208         } \
 209 } while (0)
 210
 211 extern void BUILD_BUG(void);
 212 #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
 213
 214 /* Trap pasters of __FUNCTION__ at compile-time */
 215 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
 216 #define __FUNCTION__ (__func__)
 217 #endif
 218
 219 #endif