kernel.h
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上传日期:2009-04-28
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文件大小:9k
- #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>
- #include <linux/stddef.h>
- #include <linux/types.h>
- #include <linux/compiler.h>
- #include <linux/bitops.h>
- #include <asm/byteorder.h>
- #include <asm/bug.h>
- extern const char linux_banner[];
- #define INT_MAX ((int)(~0U>>1))
- #define INT_MIN (-INT_MAX - 1)
- #define UINT_MAX (~0U)
- #define LONG_MAX ((long)(~0UL>>1))
- #define LONG_MIN (-LONG_MAX - 1)
- #define ULONG_MAX (~0UL)
- #define STACK_MAGIC 0xdeadbeef
- #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
- #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
- #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 */
- extern int console_printk[];
- #define console_loglevel (console_printk[0])
- #define default_message_loglevel (console_printk[1])
- #define minimum_console_loglevel (console_printk[2])
- #define default_console_loglevel (console_printk[3])
- struct completion;
- /**
- * might_sleep - annotation for functions that can sleep
- *
- * this macro will print a stack trace if it is executed in an atomic
- * context (spinlock, irq-handler, ...).
- *
- * This is a useful debugging help to be able to catch problems early and not
- * be biten later when the calling function happens to sleep when it is not
- * supposed to.
- */
- #ifdef CONFIG_PREEMPT_VOLUNTARY
- extern int cond_resched(void);
- # define might_resched() cond_resched()
- #else
- # define might_resched() do { } while (0)
- #endif
- #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
- void __might_sleep(char *file, int line);
- # define might_sleep()
- do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
- #else
- # define might_sleep() do { might_resched(); } while (0)
- #endif
- #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
- #define abs(x) ({
- int __x = (x);
- (__x < 0) ? -__x : __x;
- })
- #define labs(x) ({
- long __x = (x);
- (__x < 0) ? -__x : __x;
- })
- extern struct notifier_block *panic_notifier_list;
- extern long (*panic_blink)(long time);
- NORET_TYPE void panic(const char * fmt, ...)
- __attribute__ ((NORET_AND format (printf, 1, 2)));
- fastcall NORET_TYPE void do_exit(long error_code)
- ATTRIB_NORET;
- NORET_TYPE void complete_and_exit(struct completion *, long)
- ATTRIB_NORET;
- extern unsigned long simple_strtoul(const char *,char **,unsigned int);
- extern long simple_strtol(const char *,char **,unsigned int);
- extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
- extern long long simple_strtoll(const char *,char **,unsigned int);
- 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 snprintf(char * buf, size_t size, const char * fmt, ...)
- __attribute__ ((format (printf, 3, 4)));
- extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
- __attribute__ ((format (printf, 3, 0)));
- extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
- __attribute__ ((format (printf, 3, 4)));
- extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
- __attribute__ ((format (printf, 3, 0)));
- extern int sscanf(const char *, const char *, ...)
- __attribute__ ((format (scanf, 2, 3)));
- extern int vsscanf(const char *, const char *, va_list)
- __attribute__ ((format (scanf, 2, 0)));
- extern int get_option(char **str, int *pint);
- extern char *get_options(const char *str, int nints, int *ints);
- extern unsigned long long memparse(char *ptr, char **retptr);
- extern int __kernel_text_address(unsigned long addr);
- extern int kernel_text_address(unsigned long addr);
- extern int session_of_pgrp(int pgrp);
- #ifdef CONFIG_PRINTK
- asmlinkage int vprintk(const char *fmt, va_list args)
- __attribute__ ((format (printf, 1, 0)));
- asmlinkage int printk(const char * fmt, ...)
- __attribute__ ((format (printf, 1, 2)));
- #else
- static inline int vprintk(const char *s, va_list args)
- __attribute__ ((format (printf, 1, 0)));
- static inline int vprintk(const char *s, va_list args) { return 0; }
- static inline int printk(const char *s, ...)
- __attribute__ ((format (printf, 1, 2)));
- static inline int printk(const char *s, ...) { return 0; }
- #endif
- unsigned long int_sqrt(unsigned long);
- static inline int __attribute_pure__ long_log2(unsigned long x)
- {
- int r = 0;
- for (x >>= 1; x > 0; x >>= 1)
- r++;
- return r;
- }
- static inline unsigned long __attribute_const__ roundup_pow_of_two(unsigned long x)
- {
- return (1UL << fls(x - 1));
- }
- extern int printk_ratelimit(void);
- extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
- static inline void console_silent(void)
- {
- console_loglevel = 0;
- }
- static inline void console_verbose(void)
- {
- if (console_loglevel)
- console_loglevel = 15;
- }
- extern void bust_spinlocks(int yes);
- extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
- extern int panic_timeout;
- extern int panic_on_oops;
- extern int tainted;
- extern const char *print_tainted(void);
- extern void add_taint(unsigned);
- /* Values used for system_state */
- extern enum system_states {
- SYSTEM_BOOTING,
- SYSTEM_RUNNING,
- SYSTEM_HALT,
- SYSTEM_POWER_OFF,
- SYSTEM_RESTART,
- } system_state;
- #define TAINT_PROPRIETARY_MODULE (1<<0)
- #define TAINT_FORCED_MODULE (1<<1)
- #define TAINT_UNSAFE_SMP (1<<2)
- #define TAINT_FORCED_RMMOD (1<<3)
- #define TAINT_MACHINE_CHECK (1<<4)
- #define TAINT_BAD_PAGE (1<<5)
- extern void dump_stack(void);
- #ifdef 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]
- #define NIP6(addr)
- ntohs((addr).s6_addr16[0]),
- ntohs((addr).s6_addr16[1]),
- ntohs((addr).s6_addr16[2]),
- ntohs((addr).s6_addr16[3]),
- ntohs((addr).s6_addr16[4]),
- ntohs((addr).s6_addr16[5]),
- ntohs((addr).s6_addr16[6]),
- ntohs((addr).s6_addr16[7])
- #if defined(__LITTLE_ENDIAN)
- #define HIPQUAD(addr)
- ((unsigned char *)&addr)[3],
- ((unsigned char *)&addr)[2],
- ((unsigned char *)&addr)[1],
- ((unsigned char *)&addr)[0]
- #elif defined(__BIG_ENDIAN)
- #define HIPQUAD NIPQUAD
- #else
- #error "Please fix asm/byteorder.h"
- #endif /* __LITTLE_ENDIAN */
- /*
- * min()/max() macros that also do
- * strict type-checking.. See the
- * "unnecessary" pointer comparison.
- */
- #define min(x,y) ({
- typeof(x) _x = (x);
- typeof(y) _y = (y);
- (void) (&_x == &_y);
- _x < _y ? _x : _y; })
- #define max(x,y) ({
- typeof(x) _x = (x);
- typeof(y) _y = (y);
- (void) (&_x == &_y);
- _x > _y ? _x : _y; })
- /*
- * ..and if you can't take the strict
- * types, you can specify one yourself.
- *
- * Or not use min/max at all, of course.
- */
- #define min_t(type,x,y)
- ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
- #define max_t(type,x,y)
- ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
- /**
- * container_of - cast a member of a structure out to the containing structure
- *
- * @ptr: the pointer to the member.
- * @type: the type of the container struct this is embedded in.
- * @member: the name of the member within the struct.
- *
- */
- #define container_of(ptr, type, member) ({
- const typeof( ((type *)0)->member ) *__mptr = (ptr);
- (type *)( (char *)__mptr - offsetof(type,member) );})
- /*
- * Check at compile time that something is of a particular type.
- * Always evaluates to 1 so you may use it easily in comparisons.
- */
- #define typecheck(type,x)
- ({ type __dummy;
- typeof(x) __dummy2;
- (void)(&__dummy == &__dummy2);
- 1;
- })
- #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 */
- unsigned short pad; /* explicit padding for m68k */
- unsigned long totalhigh; /* Total high memory size */
- unsigned long freehigh; /* Available high memory size */
- unsigned int mem_unit; /* Memory unit size in bytes */
- char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
- };
- /* Force a compilation error if condition is false */
- #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
- #ifdef CONFIG_SYSCTL
- extern int randomize_va_space;
- #else
- #define randomize_va_space 1
- #endif
- /* Trap pasters of __FUNCTION__ at compile-time */
- #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
- #define __FUNCTION__ (__func__)
- #endif
- #endif