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 extern const char linux_banner[];
20 extern const char vx_linux_banner[];
22 #define INT_MAX ((int)(~0U>>1))
23 #define INT_MIN (-INT_MAX - 1)
24 #define UINT_MAX (~0U)
25 #define LONG_MAX ((long)(~0UL>>1))
26 #define LONG_MIN (-LONG_MAX - 1)
27 #define ULONG_MAX (~0UL)
29 #define STACK_MAGIC 0xdeadbeef
31 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
32 #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
34 #define KERN_EMERG "<0>" /* system is unusable */
35 #define KERN_ALERT "<1>" /* action must be taken immediately */
36 #define KERN_CRIT "<2>" /* critical conditions */
37 #define KERN_ERR "<3>" /* error conditions */
38 #define KERN_WARNING "<4>" /* warning conditions */
39 #define KERN_NOTICE "<5>" /* normal but significant condition */
40 #define KERN_INFO "<6>" /* informational */
41 #define KERN_DEBUG "<7>" /* debug-level messages */
43 extern int console_printk[];
45 #define console_loglevel (console_printk[0])
46 #define default_message_loglevel (console_printk[1])
47 #define minimum_console_loglevel (console_printk[2])
48 #define default_console_loglevel (console_printk[3])
53 * might_sleep - annotation for functions that can sleep
55 * this macro will print a stack trace if it is executed in an atomic
56 * context (spinlock, irq-handler, ...).
58 * This is a useful debugging help to be able to catch problems early and not
59 * be biten later when the calling function happens to sleep when it is not
62 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
63 #define might_sleep() __might_sleep(__FILE__, __LINE__)
64 #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
65 void __might_sleep(char *file, int line);
67 #define might_sleep() do {} while(0)
68 #define might_sleep_if(cond) do {} while (0)
73 (__x < 0) ? -__x : __x; \
78 (__x < 0) ? -__x : __x; \
81 extern struct notifier_block *panic_notifier_list;
82 extern long (*panic_blink)(long time);
83 NORET_TYPE void panic(const char * fmt, ...)
84 __attribute__ ((NORET_AND format (printf, 1, 2)));
85 fastcall NORET_TYPE void do_exit(long error_code)
87 NORET_TYPE void complete_and_exit(struct completion *, long)
89 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
90 extern long simple_strtol(const char *,char **,unsigned int);
91 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
92 extern long long simple_strtoll(const char *,char **,unsigned int);
93 extern int sprintf(char * buf, const char * fmt, ...)
94 __attribute__ ((format (printf, 2, 3)));
95 extern int vsprintf(char *buf, const char *, va_list)
96 __attribute__ ((format (printf, 2, 0)));
97 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
98 __attribute__ ((format (printf, 3, 4)));
99 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
100 __attribute__ ((format (printf, 3, 0)));
101 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
102 __attribute__ ((format (printf, 3, 4)));
103 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
104 __attribute__ ((format (printf, 3, 0)));
106 extern int sscanf(const char *, const char *, ...)
107 __attribute__ ((format (scanf, 2, 3)));
108 extern int vsscanf(const char *, const char *, va_list)
109 __attribute__ ((format (scanf, 2, 0)));
111 extern int get_option(char **str, int *pint);
112 extern char *get_options(const char *str, int nints, int *ints);
113 extern unsigned long long memparse(char *ptr, char **retptr);
115 extern int __kernel_text_address(unsigned long addr);
116 extern int kernel_text_address(unsigned long addr);
117 extern int session_of_pgrp(int pgrp);
120 asmlinkage int vprintk(const char *fmt, va_list args)
121 __attribute__ ((format (printf, 1, 0)));
122 asmlinkage int printk(const char * fmt, ...)
123 __attribute__ ((format (printf, 1, 2)));
125 static inline int vprintk(const char *s, va_list args)
126 __attribute__ ((format (printf, 1, 0)));
127 static inline int vprintk(const char *s, va_list args) { return 0; }
128 static inline int printk(const char *s, ...)
129 __attribute__ ((format (printf, 1, 2)));
130 static inline int printk(const char *s, ...) { return 0; }
133 unsigned long int_sqrt(unsigned long);
135 static inline int __attribute_pure__ long_log2(unsigned long x)
138 for (x >>= 1; x > 0; x >>= 1)
143 static inline unsigned long __attribute_const__ roundup_pow_of_two(unsigned long x)
145 return (1UL << fls(x - 1));
148 extern int printk_ratelimit(void);
149 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
151 static inline void console_silent(void)
153 console_loglevel = 0;
156 static inline void console_verbose(void)
158 if (console_loglevel)
159 console_loglevel = 15;
162 extern void bust_spinlocks(int yes);
163 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
164 extern int panic_timeout;
165 extern int panic_on_oops;
167 extern const char *print_tainted(void);
168 extern void add_taint(unsigned);
170 /* Values used for system_state */
171 extern enum system_states {
179 #define TAINT_PROPRIETARY_MODULE (1<<0)
180 #define TAINT_FORCED_MODULE (1<<1)
181 #define TAINT_UNSAFE_SMP (1<<2)
182 #define TAINT_FORCED_RMMOD (1<<3)
183 #define TAINT_MACHINE_CHECK (1<<4)
184 #define TAINT_BAD_PAGE (1<<5)
186 extern void dump_stack(void);
189 #define pr_debug(fmt,arg...) \
190 printk(KERN_DEBUG fmt,##arg)
192 #define pr_debug(fmt,arg...) \
196 #define pr_info(fmt,arg...) \
197 printk(KERN_INFO fmt,##arg)
200 * Display an IP address in readable format.
203 #define NIPQUAD(addr) \
204 ((unsigned char *)&addr)[0], \
205 ((unsigned char *)&addr)[1], \
206 ((unsigned char *)&addr)[2], \
207 ((unsigned char *)&addr)[3]
210 ntohs((addr).s6_addr16[0]), \
211 ntohs((addr).s6_addr16[1]), \
212 ntohs((addr).s6_addr16[2]), \
213 ntohs((addr).s6_addr16[3]), \
214 ntohs((addr).s6_addr16[4]), \
215 ntohs((addr).s6_addr16[5]), \
216 ntohs((addr).s6_addr16[6]), \
217 ntohs((addr).s6_addr16[7])
219 #if defined(__LITTLE_ENDIAN)
220 #define HIPQUAD(addr) \
221 ((unsigned char *)&addr)[3], \
222 ((unsigned char *)&addr)[2], \
223 ((unsigned char *)&addr)[1], \
224 ((unsigned char *)&addr)[0]
225 #elif defined(__BIG_ENDIAN)
226 #define HIPQUAD NIPQUAD
228 #error "Please fix asm/byteorder.h"
229 #endif /* __LITTLE_ENDIAN */
232 * min()/max() macros that also do
233 * strict type-checking.. See the
234 * "unnecessary" pointer comparison.
236 #define min(x,y) ({ \
237 typeof(x) _x = (x); \
238 typeof(y) _y = (y); \
239 (void) (&_x == &_y); \
240 _x < _y ? _x : _y; })
242 #define max(x,y) ({ \
243 typeof(x) _x = (x); \
244 typeof(y) _y = (y); \
245 (void) (&_x == &_y); \
246 _x > _y ? _x : _y; })
249 * ..and if you can't take the strict
250 * types, you can specify one yourself.
252 * Or not use min/max at all, of course.
254 #define min_t(type,x,y) \
255 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
256 #define max_t(type,x,y) \
257 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
261 * container_of - cast a member of a structure out to the containing structure
263 * @ptr: the pointer to the member.
264 * @type: the type of the container struct this is embedded in.
265 * @member: the name of the member within the struct.
268 #define container_of(ptr, type, member) ({ \
269 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
270 (type *)( (char *)__mptr - offsetof(type,member) );})
273 * Check at compile time that something is of a particular type.
274 * Always evaluates to 1 so you may use it easily in comparisons.
276 #define typecheck(type,x) \
278 typeof(x) __dummy2; \
279 (void)(&__dummy == &__dummy2); \
283 #endif /* __KERNEL__ */
285 #define SI_LOAD_SHIFT 16
287 long uptime; /* Seconds since boot */
288 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
289 unsigned long totalram; /* Total usable main memory size */
290 unsigned long freeram; /* Available memory size */
291 unsigned long sharedram; /* Amount of shared memory */
292 unsigned long bufferram; /* Memory used by buffers */
293 unsigned long totalswap; /* Total swap space size */
294 unsigned long freeswap; /* swap space still available */
295 unsigned short procs; /* Number of current processes */
296 unsigned short pad; /* explicit padding for m68k */
297 unsigned long totalhigh; /* Total high memory size */
298 unsigned long freehigh; /* Available high memory size */
299 unsigned int mem_unit; /* Memory unit size in bytes */
300 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
303 extern void BUILD_BUG(void);
304 #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
307 extern int randomize_va_space;
309 #define randomize_va_space 1
312 /* Trap pasters of __FUNCTION__ at compile-time */
313 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
314 #define __FUNCTION__ (__func__)