LXR linux-old/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
  15/* Optimization barrier */
  16/* The "volatile" is due to gcc bugs */
  17#define barrier() __asm__ __volatile__("": : :"memory")
  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
  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
  46# define NORET_TYPE    /**/
  47# define ATTRIB_NORET  __attribute__((noreturn))
  48# define NORET_AND     noreturn,
  49
  50#ifdef __i386__
  51#define FASTCALL(x)     x __attribute__((regparm(3)))
  52#else
  53#define FASTCALL(x)     x
  54#endif
  55
  56struct completion;
  57
  58extern struct notifier_block *panic_notifier_list;
  59NORET_TYPE void panic(const char * fmt, ...)
  60        __attribute__ ((NORET_AND format (printf, 1, 2)));
  61asmlinkage NORET_TYPE void do_exit(long error_code)
  62        ATTRIB_NORET;
  63NORET_TYPE void complete_and_exit(struct completion *, long)
  64        ATTRIB_NORET;
  65extern int abs(int);
  66extern unsigned long simple_strtoul(const char *,char **,unsigned int);
  67extern long simple_strtol(const char *,char **,unsigned int);
  68extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
  69extern long long simple_strtoll(const char *,char **,unsigned int);
  70extern int sprintf(char * buf, const char * fmt, ...)
  71        __attribute__ ((format (printf, 2, 3)));
  72extern int vsprintf(char *buf, const char *, va_list);
  73extern int snprintf(char * buf, size_t size, const char * fmt, ...)
  74        __attribute__ ((format (printf, 3, 4)));
  75extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
  76
  77extern int sscanf(const char *, const char *, ...)
  78        __attribute__ ((format (scanf,2,3)));
  79extern int vsscanf(const char *, const char *, va_list);
  80
  81extern int get_option(char **str, int *pint);
  82extern char *get_options(char *str, int nints, int *ints);
  83extern unsigned long long memparse(char *ptr, char **retptr);
  84extern void dev_probe_lock(void);
  85extern void dev_probe_unlock(void);
  86
  87extern int session_of_pgrp(int pgrp);
  88
  89asmlinkage int printk(const char * fmt, ...)
  90        __attribute__ ((format (printf, 1, 2)));
  91
  92static inline void console_silent(void)
  93{
  94        console_loglevel = 0;
  95}
  96
  97static inline void console_verbose(void)
  98{
  99        if (console_loglevel)
 100                console_loglevel = 15;
 101}
 102
 103extern void bust_spinlocks(int yes);
 104extern int oops_in_progress;            /* If set, an oops, panic(), BUG() or die() is in progress */
 105
 106extern int tainted;
 107extern const char *print_tainted(void);
 108
 109#if 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#define HIPQUAD(addr) \
 131        ((unsigned char *)&addr)[3], \
 132        ((unsigned char *)&addr)[2], \
 133        ((unsigned char *)&addr)[1], \
 134        ((unsigned char *)&addr)[0]
 135
 136/*
 137 * min()/max() macros that also do
 138 * strict type-checking.. See the
 139 * "unnecessary" pointer comparison.
 140 */
 141#define min(x,y) ({ \
 142        const typeof(x) _x = (x);       \
 143        const typeof(y) _y = (y);       \
 144        (void) (&_x == &_y);            \
 145        _x < _y ? _x : _y; })
 146
 147#define max(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/*
 154 * ..and if you can't take the strict
 155 * types, you can specify one yourself.
 156 *
 157 * Or not use min/max at all, of course.
 158 */
 159#define min_t(type,x,y) \
 160        ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
 161#define max_t(type,x,y) \
 162        ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
 163
 164#endif /* __KERNEL__ */
 165
 166#define SI_LOAD_SHIFT   16
 167struct sysinfo {
 168        long uptime;                    /* Seconds since boot */
 169        unsigned long loads[3];         /* 1, 5, and 15 minute load averages */
 170        unsigned long totalram;         /* Total usable main memory size */
 171        unsigned long freeram;          /* Available memory size */
 172        unsigned long sharedram;        /* Amount of shared memory */
 173        unsigned long bufferram;        /* Memory used by buffers */
 174        unsigned long totalswap;        /* Total swap space size */
 175        unsigned long freeswap;         /* swap space still available */
 176        unsigned short procs;           /* Number of current processes */
 177        unsigned short pad;             /* explicit padding for m68k */
 178        unsigned long totalhigh;        /* Total high memory size */
 179        unsigned long freehigh;         /* Available high memory size */
 180        unsigned int mem_unit;          /* Memory unit size in bytes */
 181        char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
 182};
 183
 184#endif
 185