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
  14 /* Optimization barrier */
  15 /* The "volatile" is due to gcc bugs */
  16 #define barrier() __asm__ __volatile__("": : :"memory")
  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
  29 #define KERN_EMERG      "<0>"   /* system is unusable                   */
  30 #define KERN_ALERT      "<1>"   /* action must be taken immediately     */
  31 #define KERN_CRIT       "<2>"   /* critical conditions                  */
  32 #define KERN_ERR        "<3>"   /* error conditions                     */
  33 #define KERN_WARNING    "<4>"   /* warning conditions                   */
  34 #define KERN_NOTICE     "<5>"   /* normal but significant condition     */
  35 #define KERN_INFO       "<6>"   /* informational                        */
  36 #define KERN_DEBUG      "<7>"   /* debug-level messages                 */
  37
  38 # define NORET_TYPE    /**/
  39 # define ATTRIB_NORET  __attribute__((noreturn))
  40 # define NORET_AND     noreturn,
  41
  42 #ifdef __i386__
  43 #define FASTCALL(x)     x __attribute__((regparm(3)))
  44 #else
  45 #define FASTCALL(x)     x
  46 #endif
  47
  48 struct semaphore;
  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 NORET_TYPE void do_exit(long error_code)
  54         ATTRIB_NORET;
  55 NORET_TYPE void up_and_exit(struct semaphore *, long)
  56         ATTRIB_NORET;
  57 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
  58 extern long simple_strtol(const char *,char **,unsigned int);
  59 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
  60 extern long long simple_strtoll(const char *,char **,unsigned int);
  61 extern int sprintf(char * buf, const char * fmt, ...);
  62 extern int vsprintf(char *buf, const char *, va_list);
  63 extern int get_option(char **str, int *pint);
  64 extern char *get_options(char *str, int nints, int *ints);
  65 extern unsigned long memparse(char *ptr, char **retptr);
  66 extern void dev_probe_lock(void);
  67 extern void dev_probe_unlock(void);
  68
  69 extern int session_of_pgrp(int pgrp);
  70
  71 asmlinkage int printk(const char * fmt, ...)
  72         __attribute__ ((format (printf, 1, 2)));
  73
  74 extern int console_loglevel;
  75
  76 static inline void console_silent(void)
  77 {
  78         console_loglevel = 0;
  79 }
  80
  81 static inline void console_verbose(void)
  82 {
  83         if (console_loglevel)
  84                 console_loglevel = 15;
  85 }
  86
  87 #if DEBUG
  88 #define pr_debug(fmt,arg...) \
  89         printk(KERN_DEBUG fmt,##arg)
  90 #else
  91 #define pr_debug(fmt,arg...) \
  92         do { } while (0)
  93 #endif
  94
  95 #define pr_info(fmt,arg...) \
  96         printk(KERN_INFO fmt,##arg)
  97
  98 /*
  99  *      Display an IP address in readable format.
 100  */
 101
 102 #define NIPQUAD(addr) \
 103         ((unsigned char *)&addr)[0], \
 104         ((unsigned char *)&addr)[1], \
 105         ((unsigned char *)&addr)[2], \
 106         ((unsigned char *)&addr)[3]
 107
 108 #define HIPQUAD(addr) \
 109         ((unsigned char *)&addr)[3], \
 110         ((unsigned char *)&addr)[2], \
 111         ((unsigned char *)&addr)[1], \
 112         ((unsigned char *)&addr)[0]
 113
 114 #endif /* __KERNEL__ */
 115
 116 #define SI_LOAD_SHIFT   16
 117 struct sysinfo {
 118         long uptime;                    /* Seconds since boot */
 119         unsigned long loads[3];         /* 1, 5, and 15 minute load averages */
 120         unsigned long totalram;         /* Total usable main memory size */
 121         unsigned long freeram;          /* Available memory size */
 122         unsigned long sharedram;        /* Amount of shared memory */
 123         unsigned long bufferram;        /* Memory used by buffers */
 124         unsigned long totalswap;        /* Total swap space size */
 125         unsigned long freeswap;         /* swap space still available */
 126         unsigned short procs;           /* Number of current processes */
 127         unsigned long totalhigh;        /* Total high memory size */
 128         unsigned long freehigh;         /* Available high memory size */
 129         unsigned int mem_unit;          /* Memory unit size in bytes */
 130         char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
 131 };
 132
 133 #endif