[PATCH] genirq ia64 cleanup
[linux-2.6/zen-sources.git] / include / linux / kernel.h
blob5c1ec1f84eab93eea32a8d173486ff2cbcd5036b
1 #ifndef _LINUX_KERNEL_H
2 #define _LINUX_KERNEL_H
4 /*
5 * 'kernel.h' contains some often-used function prototypes etc
6 */
8 #ifdef __KERNEL__
10 #include <stdarg.h>
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>
17 #include <asm/bug.h>
19 extern const char linux_banner[];
21 #define INT_MAX ((int)(~0U>>1))
22 #define INT_MIN (-INT_MAX - 1)
23 #define UINT_MAX (~0U)
24 #define LONG_MAX ((long)(~0UL>>1))
25 #define LONG_MIN (-LONG_MAX - 1)
26 #define ULONG_MAX (~0UL)
27 #define LLONG_MAX ((long long)(~0ULL>>1))
28 #define LLONG_MIN (-LLONG_MAX - 1)
29 #define ULLONG_MAX (~0ULL)
31 #define STACK_MAGIC 0xdeadbeef
33 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
34 #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
35 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
37 #define KERN_EMERG "<0>" /* system is unusable */
38 #define KERN_ALERT "<1>" /* action must be taken immediately */
39 #define KERN_CRIT "<2>" /* critical conditions */
40 #define KERN_ERR "<3>" /* error conditions */
41 #define KERN_WARNING "<4>" /* warning conditions */
42 #define KERN_NOTICE "<5>" /* normal but significant condition */
43 #define KERN_INFO "<6>" /* informational */
44 #define KERN_DEBUG "<7>" /* debug-level messages */
46 extern int console_printk[];
48 #define console_loglevel (console_printk[0])
49 #define default_message_loglevel (console_printk[1])
50 #define minimum_console_loglevel (console_printk[2])
51 #define default_console_loglevel (console_printk[3])
53 struct completion;
54 struct pt_regs;
55 struct user;
57 /**
58 * might_sleep - annotation for functions that can sleep
60 * this macro will print a stack trace if it is executed in an atomic
61 * context (spinlock, irq-handler, ...).
63 * This is a useful debugging help to be able to catch problems early and not
64 * be biten later when the calling function happens to sleep when it is not
65 * supposed to.
67 #ifdef CONFIG_PREEMPT_VOLUNTARY
68 extern int cond_resched(void);
69 # define might_resched() cond_resched()
70 #else
71 # define might_resched() do { } while (0)
72 #endif
74 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
75 void __might_sleep(char *file, int line);
76 # define might_sleep() \
77 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
78 #else
79 # define might_sleep() do { might_resched(); } while (0)
80 #endif
82 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
84 #define abs(x) ({ \
85 int __x = (x); \
86 (__x < 0) ? -__x : __x; \
89 #define labs(x) ({ \
90 long __x = (x); \
91 (__x < 0) ? -__x : __x; \
94 extern struct atomic_notifier_head panic_notifier_list;
95 extern long (*panic_blink)(long time);
96 NORET_TYPE void panic(const char * fmt, ...)
97 __attribute__ ((NORET_AND format (printf, 1, 2)));
98 extern void oops_enter(void);
99 extern void oops_exit(void);
100 extern int oops_may_print(void);
101 fastcall NORET_TYPE void do_exit(long error_code)
102 ATTRIB_NORET;
103 NORET_TYPE void complete_and_exit(struct completion *, long)
104 ATTRIB_NORET;
105 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
106 extern long simple_strtol(const char *,char **,unsigned int);
107 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
108 extern long long simple_strtoll(const char *,char **,unsigned int);
109 extern int sprintf(char * buf, const char * fmt, ...)
110 __attribute__ ((format (printf, 2, 3)));
111 extern int vsprintf(char *buf, const char *, va_list)
112 __attribute__ ((format (printf, 2, 0)));
113 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
114 __attribute__ ((format (printf, 3, 4)));
115 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
116 __attribute__ ((format (printf, 3, 0)));
117 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
118 __attribute__ ((format (printf, 3, 4)));
119 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
120 __attribute__ ((format (printf, 3, 0)));
121 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
122 __attribute__ ((format (printf, 2, 3)));
124 extern int sscanf(const char *, const char *, ...)
125 __attribute__ ((format (scanf, 2, 3)));
126 extern int vsscanf(const char *, const char *, va_list)
127 __attribute__ ((format (scanf, 2, 0)));
129 extern int get_option(char **str, int *pint);
130 extern char *get_options(const char *str, int nints, int *ints);
131 extern unsigned long long memparse(char *ptr, char **retptr);
133 extern int core_kernel_text(unsigned long addr);
134 extern int __kernel_text_address(unsigned long addr);
135 extern int kernel_text_address(unsigned long addr);
136 extern int session_of_pgrp(int pgrp);
138 extern void dump_thread(struct pt_regs *regs, struct user *dump);
140 #ifdef CONFIG_PRINTK
141 asmlinkage int vprintk(const char *fmt, va_list args)
142 __attribute__ ((format (printf, 1, 0)));
143 asmlinkage int printk(const char * fmt, ...)
144 __attribute__ ((format (printf, 1, 2)));
145 #else
146 static inline int vprintk(const char *s, va_list args)
147 __attribute__ ((format (printf, 1, 0)));
148 static inline int vprintk(const char *s, va_list args) { return 0; }
149 static inline int printk(const char *s, ...)
150 __attribute__ ((format (printf, 1, 2)));
151 static inline int printk(const char *s, ...) { return 0; }
152 #endif
154 unsigned long int_sqrt(unsigned long);
156 static inline int __attribute_pure__ long_log2(unsigned long x)
158 int r = 0;
159 for (x >>= 1; x > 0; x >>= 1)
160 r++;
161 return r;
164 static inline unsigned long
165 __attribute_const__ roundup_pow_of_two(unsigned long x)
167 return 1UL << fls_long(x - 1);
170 extern int printk_ratelimit(void);
171 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
173 static inline void console_silent(void)
175 console_loglevel = 0;
178 static inline void console_verbose(void)
180 if (console_loglevel)
181 console_loglevel = 15;
184 extern void bust_spinlocks(int yes);
185 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
186 extern int panic_timeout;
187 extern int panic_on_oops;
188 extern int tainted;
189 extern const char *print_tainted(void);
190 extern void add_taint(unsigned);
192 /* Values used for system_state */
193 extern enum system_states {
194 SYSTEM_BOOTING,
195 SYSTEM_RUNNING,
196 SYSTEM_HALT,
197 SYSTEM_POWER_OFF,
198 SYSTEM_RESTART,
199 SYSTEM_SUSPEND_DISK,
200 } system_state;
202 #define TAINT_PROPRIETARY_MODULE (1<<0)
203 #define TAINT_FORCED_MODULE (1<<1)
204 #define TAINT_UNSAFE_SMP (1<<2)
205 #define TAINT_FORCED_RMMOD (1<<3)
206 #define TAINT_MACHINE_CHECK (1<<4)
207 #define TAINT_BAD_PAGE (1<<5)
209 extern void dump_stack(void);
211 #ifdef DEBUG
212 #define pr_debug(fmt,arg...) \
213 printk(KERN_DEBUG fmt,##arg)
214 #else
215 #define pr_debug(fmt,arg...) \
216 do { } while (0)
217 #endif
219 #define pr_info(fmt,arg...) \
220 printk(KERN_INFO fmt,##arg)
223 * Display an IP address in readable format.
226 #define NIPQUAD(addr) \
227 ((unsigned char *)&addr)[0], \
228 ((unsigned char *)&addr)[1], \
229 ((unsigned char *)&addr)[2], \
230 ((unsigned char *)&addr)[3]
231 #define NIPQUAD_FMT "%u.%u.%u.%u"
233 #define NIP6(addr) \
234 ntohs((addr).s6_addr16[0]), \
235 ntohs((addr).s6_addr16[1]), \
236 ntohs((addr).s6_addr16[2]), \
237 ntohs((addr).s6_addr16[3]), \
238 ntohs((addr).s6_addr16[4]), \
239 ntohs((addr).s6_addr16[5]), \
240 ntohs((addr).s6_addr16[6]), \
241 ntohs((addr).s6_addr16[7])
242 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
243 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
245 #if defined(__LITTLE_ENDIAN)
246 #define HIPQUAD(addr) \
247 ((unsigned char *)&addr)[3], \
248 ((unsigned char *)&addr)[2], \
249 ((unsigned char *)&addr)[1], \
250 ((unsigned char *)&addr)[0]
251 #elif defined(__BIG_ENDIAN)
252 #define HIPQUAD NIPQUAD
253 #else
254 #error "Please fix asm/byteorder.h"
255 #endif /* __LITTLE_ENDIAN */
258 * min()/max() macros that also do
259 * strict type-checking.. See the
260 * "unnecessary" pointer comparison.
262 #define min(x,y) ({ \
263 typeof(x) _x = (x); \
264 typeof(y) _y = (y); \
265 (void) (&_x == &_y); \
266 _x < _y ? _x : _y; })
268 #define max(x,y) ({ \
269 typeof(x) _x = (x); \
270 typeof(y) _y = (y); \
271 (void) (&_x == &_y); \
272 _x > _y ? _x : _y; })
275 * ..and if you can't take the strict
276 * types, you can specify one yourself.
278 * Or not use min/max at all, of course.
280 #define min_t(type,x,y) \
281 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
282 #define max_t(type,x,y) \
283 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
287 * container_of - cast a member of a structure out to the containing structure
288 * @ptr: the pointer to the member.
289 * @type: the type of the container struct this is embedded in.
290 * @member: the name of the member within the struct.
293 #define container_of(ptr, type, member) ({ \
294 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
295 (type *)( (char *)__mptr - offsetof(type,member) );})
298 * Check at compile time that something is of a particular type.
299 * Always evaluates to 1 so you may use it easily in comparisons.
301 #define typecheck(type,x) \
302 ({ type __dummy; \
303 typeof(x) __dummy2; \
304 (void)(&__dummy == &__dummy2); \
305 1; \
309 * Check at compile time that 'function' is a certain type, or is a pointer
310 * to that type (needs to use typedef for the function type.)
312 #define typecheck_fn(type,function) \
313 ({ typeof(type) __tmp = function; \
314 (void)__tmp; \
317 #endif /* __KERNEL__ */
319 #define SI_LOAD_SHIFT 16
320 struct sysinfo {
321 long uptime; /* Seconds since boot */
322 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
323 unsigned long totalram; /* Total usable main memory size */
324 unsigned long freeram; /* Available memory size */
325 unsigned long sharedram; /* Amount of shared memory */
326 unsigned long bufferram; /* Memory used by buffers */
327 unsigned long totalswap; /* Total swap space size */
328 unsigned long freeswap; /* swap space still available */
329 unsigned short procs; /* Number of current processes */
330 unsigned short pad; /* explicit padding for m68k */
331 unsigned long totalhigh; /* Total high memory size */
332 unsigned long freehigh; /* Available high memory size */
333 unsigned int mem_unit; /* Memory unit size in bytes */
334 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
337 /* Force a compilation error if condition is true */
338 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
340 /* Force a compilation error if condition is true, but also produce a
341 result (of value 0 and type size_t), so the expression can be used
342 e.g. in a structure initializer (or where-ever else comma expressions
343 aren't permitted). */
344 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
346 /* Trap pasters of __FUNCTION__ at compile-time */
347 #define __FUNCTION__ (__func__)
349 #endif