1 #ifndef _LINUX_KERNEL_H
2 #define _LINUX_KERNEL_H
5 * 'kernel.h' contains some often-used function prototypes etc
11 #include <linux/linkage.h>
12 #include <linux/stddef.h>
13 #include <linux/types.h>
14 #include <linux/compiler.h>
15 #include <linux/bitops.h>
16 #include <asm/byteorder.h>
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)
26 #define STACK_MAGIC 0xdeadbeef
28 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
29 #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
31 #define KERN_EMERG "<0>" /* system is unusable */
32 #define KERN_ALERT "<1>" /* action must be taken immediately */
33 #define KERN_CRIT "<2>" /* critical conditions */
34 #define KERN_ERR "<3>" /* error conditions */
35 #define KERN_WARNING "<4>" /* warning conditions */
36 #define KERN_NOTICE "<5>" /* normal but significant condition */
37 #define KERN_INFO "<6>" /* informational */
38 #define KERN_DEBUG "<7>" /* debug-level messages */
40 extern int console_printk[];
42 #define console_loglevel (console_printk[0])
43 #define default_message_loglevel (console_printk[1])
44 #define minimum_console_loglevel (console_printk[2])
45 #define default_console_loglevel (console_printk[3])
49 #ifdef CONFIG_PREEMPT_VOLUNTARY
50 extern void __cond_resched(void);
51 # define might_resched() __cond_resched()
53 # define might_resched() do { } while (0)
56 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
57 void __might_sleep(char *file, int line, int atomic_depth);
58 # define might_sleep() \
59 do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
61 # define might_sleep() do { might_resched(); } while (0)
64 #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
68 (__x < 0) ? -__x : __x; \
73 (__x < 0) ? -__x : __x; \
76 extern struct notifier_block *panic_notifier_list;
77 extern long (*panic_blink)(long time);
78 NORET_TYPE void panic(const char * fmt, ...)
79 __attribute__ ((NORET_AND format (printf, 1, 2)));
80 asmlinkage NORET_TYPE void do_exit(long error_code)
82 NORET_TYPE void complete_and_exit(struct completion *, long)
84 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
85 extern long simple_strtol(const char *,char **,unsigned int);
86 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
87 extern long long simple_strtoll(const char *,char **,unsigned int);
88 extern int sprintf(char * buf, const char * fmt, ...)
89 __attribute__ ((format (printf, 2, 3)));
90 extern int vsprintf(char *buf, const char *, va_list);
91 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
92 __attribute__ ((format (printf, 3, 4)));
93 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
94 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
95 __attribute__ ((format (printf, 3, 4)));
96 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
98 extern int sscanf(const char *, const char *, ...)
99 __attribute__ ((format (scanf,2,3)));
100 extern int vsscanf(const char *, const char *, va_list);
102 extern int get_option(char **str, int *pint);
103 extern char *get_options(const char *str, int nints, int *ints);
104 extern unsigned long long memparse(char *ptr, char **retptr);
106 extern int __kernel_text_address(unsigned long addr);
107 extern int kernel_text_address(unsigned long addr);
108 extern int session_of_pgrp(int pgrp);
110 asmlinkage int vprintk(const char *fmt, va_list args);
111 asmlinkage int printk(const char * fmt, ...)
112 __attribute__ ((format (printf, 1, 2)));
114 unsigned long int_sqrt(unsigned long);
116 static inline int __attribute_pure__ long_log2(unsigned long x)
119 for (x >>= 1; x > 0; x >>= 1)
124 static inline unsigned long __attribute_const__ roundup_pow_of_two(unsigned long x)
126 return (1UL << fls(x - 1));
129 extern int printk_ratelimit(void);
130 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
132 static inline void console_silent(void)
134 console_loglevel = 0;
137 static inline void console_verbose(void)
139 if (console_loglevel)
140 console_loglevel = 15;
143 extern void bust_spinlocks(int yes);
144 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
145 extern int panic_on_oops;
147 extern const char *print_tainted(void);
148 extern void add_taint(unsigned);
151 extern void (*netdump_func) (struct pt_regs *regs);
152 extern int netdump_mode;
154 /* Values used for system_state */
155 extern enum system_states {
157 SYSTEM_BOOTING_SCHEDULER_OK,
164 #define TAINT_PROPRIETARY_MODULE (1<<0)
165 #define TAINT_FORCED_MODULE (1<<1)
166 #define TAINT_UNSAFE_SMP (1<<2)
167 #define TAINT_FORCED_RMMOD (1<<3)
168 #define TAINT_MACHINE_CHECK (1<<4)
169 #define TAINT_BAD_PAGE (1<<5)
171 extern void dump_stack(void);
174 #define pr_debug(fmt,arg...) \
175 printk(KERN_DEBUG fmt,##arg)
177 #define pr_debug(fmt,arg...) \
181 #define pr_info(fmt,arg...) \
182 printk(KERN_INFO fmt,##arg)
185 * Display an IP address in readable format.
188 #define NIPQUAD(addr) \
189 ((unsigned char *)&addr)[0], \
190 ((unsigned char *)&addr)[1], \
191 ((unsigned char *)&addr)[2], \
192 ((unsigned char *)&addr)[3]
195 ntohs((addr).s6_addr16[0]), \
196 ntohs((addr).s6_addr16[1]), \
197 ntohs((addr).s6_addr16[2]), \
198 ntohs((addr).s6_addr16[3]), \
199 ntohs((addr).s6_addr16[4]), \
200 ntohs((addr).s6_addr16[5]), \
201 ntohs((addr).s6_addr16[6]), \
202 ntohs((addr).s6_addr16[7])
204 #if defined(__LITTLE_ENDIAN)
205 #define HIPQUAD(addr) \
206 ((unsigned char *)&addr)[3], \
207 ((unsigned char *)&addr)[2], \
208 ((unsigned char *)&addr)[1], \
209 ((unsigned char *)&addr)[0]
210 #elif defined(__BIG_ENDIAN)
211 #define HIPQUAD NIPQUAD
213 #error "Please fix asm/byteorder.h"
214 #endif /* __LITTLE_ENDIAN */
217 * min()/max() macros that also do
218 * strict type-checking.. See the
219 * "unnecessary" pointer comparison.
221 #define min(x,y) ({ \
222 typeof(x) _x = (x); \
223 typeof(y) _y = (y); \
224 (void) (&_x == &_y); \
225 _x < _y ? _x : _y; })
227 #define max(x,y) ({ \
228 typeof(x) _x = (x); \
229 typeof(y) _y = (y); \
230 (void) (&_x == &_y); \
231 _x > _y ? _x : _y; })
234 * ..and if you can't take the strict
235 * types, you can specify one yourself.
237 * Or not use min/max at all, of course.
239 #define min_t(type,x,y) \
240 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
241 #define max_t(type,x,y) \
242 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
246 * container_of - cast a member of a structure out to the containing structure
248 * @ptr: the pointer to the member.
249 * @type: the type of the container struct this is embedded in.
250 * @member: the name of the member within the struct.
253 #define container_of(ptr, type, member) ({ \
254 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
255 (type *)( (char *)__mptr - offsetof(type,member) );})
258 * Check at compile time that something is of a particular type.
259 * Always evaluates to 1 so you may use it easily in comparisons.
261 #define typecheck(type,x) \
263 typeof(x) __dummy2; \
264 (void)(&__dummy == &__dummy2); \
268 #endif /* __KERNEL__ */
270 #define SI_LOAD_SHIFT 16
272 long uptime; /* Seconds since boot */
273 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
274 unsigned long totalram; /* Total usable main memory size */
275 unsigned long freeram; /* Available memory size */
276 unsigned long sharedram; /* Amount of shared memory */
277 unsigned long bufferram; /* Memory used by buffers */
278 unsigned long totalswap; /* Total swap space size */
279 unsigned long freeswap; /* swap space still available */
280 unsigned short procs; /* Number of current processes */
281 unsigned short pad; /* explicit padding for m68k */
282 unsigned long totalhigh; /* Total high memory size */
283 unsigned long freehigh; /* Available high memory size */
284 unsigned int mem_unit; /* Memory unit size in bytes */
285 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
288 extern void BUILD_BUG(void);
289 #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
291 /* Trap pasters of __FUNCTION__ at compile-time */
292 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
293 #define __FUNCTION__ (__func__)