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