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#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
  41extern int console_printk[];
  42
  43#define console_loglevel (console_printk[0])
  44#define default_message_loglevel (console_printk[1])
  45#define minimum_console_loglevel (console_printk[2])
  46#define default_console_loglevel (console_printk[3])
  47
  48# define NORET_TYPE    /**/
  49# define ATTRIB_NORET  __attribute__((noreturn))
  50# define NORET_AND     noreturn,
  51
  52#ifdef __i386__
  53#define FASTCALL(x)     x __attribute__((regparm(3)))
  54#define fastcall        __attribute__((regparm(3)))
  55#else
  56#define FASTCALL(x)     x
  57#define fastcall
  58#endif
  59
  60struct completion;
  61
  62extern struct notifier_block *panic_notifier_list;
  63NORET_TYPE void panic(const char * fmt, ...)
  64        __attribute__ ((NORET_AND format (printf, 1, 2)));
  65asmlinkage NORET_TYPE void do_exit(long error_code)
  66        ATTRIB_NORET;
  67NORET_TYPE void complete_and_exit(struct completion *, long)
  68        ATTRIB_NORET;
  69extern int abs(int);
  70extern unsigned long simple_strtoul(const char *,char **,unsigned int);
  71extern long simple_strtol(const char *,char **,unsigned int);
  72extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
  73extern long long simple_strtoll(const char *,char **,unsigned int);
  74extern int sprintf(char * buf, const char * fmt, ...)
  75        __attribute__ ((format (printf, 2, 3)));
  76extern int vsprintf(char *buf, const char *, va_list);
  77extern int snprintf(char * buf, size_t size, const char * fmt, ...)
  78        __attribute__ ((format (printf, 3, 4)));
  79extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
  80
  81extern int sscanf(const char *, const char *, ...)
  82        __attribute__ ((format (scanf,2,3)));
  83extern int vsscanf(const char *, const char *, va_list);
  84
  85extern int get_option(char **str, int *pint);
  86extern char *get_options(char *str, int nints, int *ints);
  87extern unsigned long long memparse(char *ptr, char **retptr);
  88extern void dev_probe_lock(void);
  89extern void dev_probe_unlock(void);
  90
  91extern int session_of_pgrp(int pgrp);
  92
  93asmlinkage int printk(const char * fmt, ...)
  94        __attribute__ ((format (printf, 1, 2)));
  95
  96static inline void console_silent(void)
  97{
  98        console_loglevel = 0;
  99}
 100
 101static inline void console_verbose(void)
 102{
 103        if (console_loglevel)
 104                console_loglevel = 15;
 105}
 106
 107extern void bust_spinlocks(int yes);
 108extern int oops_in_progress;            /* If set, an oops, panic(), BUG() or die() is in progress */
 109
 110extern int tainted;
 111extern const char *print_tainted(void);
 112
 113extern void dump_stack(void);
 114
 115#if DEBUG
 116#define pr_debug(fmt,arg...) \
 117        printk(KERN_DEBUG fmt,##arg)
 118#else
 119#define pr_debug(fmt,arg...) \
 120        do { } while (0)
 121#endif
 122
 123#define pr_info(fmt,arg...) \
 124        printk(KERN_INFO fmt,##arg)
 125
 126/*
 127 *      Display an IP address in readable format.
 128 */
 129
 130#define NIPQUAD(addr) \
 131        ((unsigned char *)&addr)[0], \
 132        ((unsigned char *)&addr)[1], \
 133        ((unsigned char *)&addr)[2], \
 134        ((unsigned char *)&addr)[3]
 135
 136#if defined(__LITTLE_ENDIAN)
 137#define HIPQUAD(addr) \
 138        ((unsigned char *)&addr)[3], \
 139        ((unsigned char *)&addr)[2], \
 140        ((unsigned char *)&addr)[1], \
 141        ((unsigned char *)&addr)[0]
 142#elif defined(__BIG_ENDIAN)
 143#define HIPQUAD NIPQUAD
 144#else
 145#error "Please fix asm/byteorder.h"
 146#endif /* __LITTLE_ENDIAN */
 147
 148/*
 149 * min()/max() macros that also do
 150 * strict type-checking.. See the
 151 * "unnecessary" pointer comparison.
 152 */
 153#define min(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#define max(x,y) ({ \
 160        const typeof(x) _x = (x);       \
 161        const typeof(y) _y = (y);       \
 162        (void) (&_x == &_y);            \
 163        _x > _y ? _x : _y; })
 164
 165/*
 166 * ..and if you can't take the strict
 167 * types, you can specify one yourself.
 168 *
 169 * Or not use min/max at all, of course.
 170 */
 171#define min_t(type,x,y) \
 172        ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
 173#define max_t(type,x,y) \
 174        ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
 175
 176extern void __out_of_line_bug(int line) ATTRIB_NORET;
 177#define out_of_line_bug() __out_of_line_bug(__LINE__)
 178
 179#endif /* __KERNEL__ */
 180
 181#define SI_LOAD_SHIFT   16
 182struct sysinfo {
 183        long uptime;                    /* Seconds since boot */
 184        unsigned long loads[3];         /* 1, 5, and 15 minute load averages */
 185        unsigned long totalram;         /* Total usable main memory size */
 186        unsigned long freeram;          /* Available memory size */
 187        unsigned long sharedram;        /* Amount of shared memory */
 188        unsigned long bufferram;        /* Memory used by buffers */
 189        unsigned long totalswap;        /* Total swap space size */
 190        unsigned long freeswap;         /* swap space still available */
 191        unsigned short procs;           /* Number of current processes */
 192        unsigned short pad;             /* explicit padding for m68k */
 193        unsigned long totalhigh;        /* Total high memory size */
 194        unsigned long freehigh;         /* Available high memory size */
 195        unsigned int mem_unit;          /* Memory unit size in bytes */
 196        char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
 197};
 198
 199#define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0)
 200
 201#define WARN_ON(condition) do { \
 202        if (unlikely((condition)!=0)) { \
 203                printk("Badness in %s at %s:%d\n", __FUNCTION__, __FILE__, __LINE__); \
 204                dump_stack(); \
 205        } \
 206} while (0)
 207
 208#endif /* _LINUX_KERNEL_H */
 209