kernel.h

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#ifndef _LINUX_KERNEL_H
#define _LINUX_KERNEL_H

/*
 * 'kernel.h' contains some often-used function prototypes etc
 */

#ifdef __KERNEL__

#include <stdarg.h>
#include <linux/linkage.h>

/* Optimization barrier */
/* The "volatile" is due to gcc bugs */
#define barrier() __asm__ __volatile__("": : :"memory")

#define INT_MAX         ((int)(~0U>>1))
#define UINT_MAX        (~0U)
#define LONG_MAX        ((long)(~0UL>>1))
#define ULONG_MAX       (~0UL)

#define STACK_MAGIC     0xdeadbeef

#define KERN_EMERG      "<0>"   /* system is unusable                   */
#define KERN_ALERT      "<1>"   /* action must be taken immediately     */
#define KERN_CRIT       "<2>"   /* critical conditions                  */
#define KERN_ERR        "<3>"   /* error conditions                     */
#define KERN_WARNING    "<4>"   /* warning conditions                   */
#define KERN_NOTICE     "<5>"   /* normal but significant condition     */
#define KERN_INFO       "<6>"   /* informational                        */
#define KERN_DEBUG      "<7>"   /* debug-level messages                 */

# define NORET_TYPE    /**/
# define ATTRIB_NORET  __attribute__((noreturn))
# define NORET_AND     noreturn,

#ifdef __i386__
#define FASTCALL(x)     x __attribute__((regparm(3)))
#else
#define FASTCALL(x)     x
#endif

extern void math_error(void);
extern struct notifier_block *panic_notifier_list;
NORET_TYPE void panic(const char * fmt, ...)
        __attribute__ ((NORET_AND format (printf, 1, 2)));
NORET_TYPE void do_exit(long error_code)
        ATTRIB_NORET;
extern unsigned long simple_strtoul(const char *,char **,unsigned int);
extern long simple_strtol(const char *,char **,unsigned int);
extern char *get_options(char *str, int *ints);
extern int sprintf(char *buf, const char *fmt, ...)
        __attribute__ ((format (printf, 2, 3)));
extern int vsprintf(char *buf, const char *, va_list)
        __attribute__ ((format (printf, 2, 0)));
extern int _vsnprintf(char *buf, int n, const char *, va_list)
        __attribute__ ((format (printf, 3, 0)));

extern int session_of_pgrp(int pgrp);

asmlinkage int printk(const char * fmt, ...)
        __attribute__ ((format (printf, 1, 2)));

#if DEBUG
#define pr_debug(fmt,arg...) \
        printk(KERN_DEBUG fmt,##arg)
#else
#define pr_debug(fmt,arg...) \
        do { } while (0)
#endif

#define pr_info(fmt,arg...) \
        printk(KERN_INFO fmt,##arg)

/*
 *      Display an IP address in readable format.
 */

#define NIPQUAD(addr) \
        ((unsigned char *)&addr)[0], \
        ((unsigned char *)&addr)[1], \
        ((unsigned char *)&addr)[2], \
        ((unsigned char *)&addr)[3]

#endif /* __KERNEL__ */

#define SI_LOAD_SHIFT   16
struct sysinfo {
        long uptime;                    /* Seconds since boot */
        unsigned long loads[3];         /* 1, 5, and 15 minute load averages */
        unsigned long totalram;         /* Total usable main memory size */
        unsigned long freeram;          /* Available memory size */
        unsigned long sharedram;        /* Amount of shared memory */
        unsigned long bufferram;        /* Memory used by buffers */
        unsigned long totalswap;        /* Total swap space size */
        unsigned long freeswap;         /* swap space still available */
        unsigned short procs;           /* Number of current processes */
        char _f[22];                    /* Pads structure to 64 bytes */
};

#endif

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