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Commit | Line | Data |
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1da177e4 LT |
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 | #include <linux/types.h> | |
14 | #include <linux/compiler.h> | |
15 | #include <linux/bitops.h> | |
f0d1b0b3 | 16 | #include <linux/log2.h> |
1da177e4 LT |
17 | #include <asm/byteorder.h> |
18 | #include <asm/bug.h> | |
19 | ||
3eb3c740 RZ |
20 | extern const char linux_banner[]; |
21 | extern const char linux_proc_banner[]; | |
22 | ||
1da177e4 LT |
23 | #define INT_MAX ((int)(~0U>>1)) |
24 | #define INT_MIN (-INT_MAX - 1) | |
25 | #define UINT_MAX (~0U) | |
26 | #define LONG_MAX ((long)(~0UL>>1)) | |
27 | #define LONG_MIN (-LONG_MAX - 1) | |
28 | #define ULONG_MAX (~0UL) | |
111ebb6e OH |
29 | #define LLONG_MAX ((long long)(~0ULL>>1)) |
30 | #define LLONG_MIN (-LLONG_MAX - 1) | |
31 | #define ULLONG_MAX (~0ULL) | |
1da177e4 LT |
32 | |
33 | #define STACK_MAGIC 0xdeadbeef | |
34 | ||
2ea58144 LT |
35 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
36 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) | |
a83308e6 | 37 | #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) |
f10db627 | 38 | #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) |
2ea58144 | 39 | |
c5e631cf RR |
40 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
41 | ||
4552d5dc | 42 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
930631ed | 43 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
b4cac1a0 | 44 | #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) |
1da177e4 | 45 | |
2da96acd JA |
46 | #ifdef CONFIG_LBD |
47 | # include <asm/div64.h> | |
48 | # define sector_div(a, b) do_div(a, b) | |
49 | #else | |
50 | # define sector_div(n, b)( \ | |
51 | { \ | |
52 | int _res; \ | |
53 | _res = (n) % (b); \ | |
54 | (n) /= (b); \ | |
55 | _res; \ | |
56 | } \ | |
57 | ) | |
58 | #endif | |
59 | ||
218e180e AM |
60 | /** |
61 | * upper_32_bits - return bits 32-63 of a number | |
62 | * @n: the number we're accessing | |
63 | * | |
64 | * A basic shift-right of a 64- or 32-bit quantity. Use this to suppress | |
65 | * the "right shift count >= width of type" warning when that quantity is | |
66 | * 32-bits. | |
67 | */ | |
68 | #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) | |
69 | ||
1da177e4 LT |
70 | #define KERN_EMERG "<0>" /* system is unusable */ |
71 | #define KERN_ALERT "<1>" /* action must be taken immediately */ | |
72 | #define KERN_CRIT "<2>" /* critical conditions */ | |
73 | #define KERN_ERR "<3>" /* error conditions */ | |
74 | #define KERN_WARNING "<4>" /* warning conditions */ | |
75 | #define KERN_NOTICE "<5>" /* normal but significant condition */ | |
76 | #define KERN_INFO "<6>" /* informational */ | |
77 | #define KERN_DEBUG "<7>" /* debug-level messages */ | |
78 | ||
47492527 IM |
79 | /* |
80 | * Annotation for a "continued" line of log printout (only done after a | |
81 | * line that had no enclosing \n). Only to be used by core/arch code | |
82 | * during early bootup (a continued line is not SMP-safe otherwise). | |
83 | */ | |
84 | #define KERN_CONT "" | |
85 | ||
1da177e4 LT |
86 | extern int console_printk[]; |
87 | ||
88 | #define console_loglevel (console_printk[0]) | |
89 | #define default_message_loglevel (console_printk[1]) | |
90 | #define minimum_console_loglevel (console_printk[2]) | |
91 | #define default_console_loglevel (console_printk[3]) | |
92 | ||
93 | struct completion; | |
df2e71fb | 94 | struct pt_regs; |
95 | struct user; | |
1da177e4 LT |
96 | |
97 | /** | |
98 | * might_sleep - annotation for functions that can sleep | |
99 | * | |
100 | * this macro will print a stack trace if it is executed in an atomic | |
101 | * context (spinlock, irq-handler, ...). | |
102 | * | |
103 | * This is a useful debugging help to be able to catch problems early and not | |
e20ec991 | 104 | * be bitten later when the calling function happens to sleep when it is not |
1da177e4 LT |
105 | * supposed to. |
106 | */ | |
f8cbd99b | 107 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
02b67cc3 HX |
108 | extern int _cond_resched(void); |
109 | # define might_resched() _cond_resched() | |
f8cbd99b IM |
110 | #else |
111 | # define might_resched() do { } while (0) | |
112 | #endif | |
113 | ||
1da177e4 | 114 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
f8cbd99b IM |
115 | void __might_sleep(char *file, int line); |
116 | # define might_sleep() \ | |
117 | do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) | |
1da177e4 | 118 | #else |
f8cbd99b | 119 | # define might_sleep() do { might_resched(); } while (0) |
1da177e4 LT |
120 | #endif |
121 | ||
368a5fa1 | 122 | #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) |
f8cbd99b | 123 | |
1da177e4 LT |
124 | #define abs(x) ({ \ |
125 | int __x = (x); \ | |
126 | (__x < 0) ? -__x : __x; \ | |
127 | }) | |
128 | ||
e041c683 | 129 | extern struct atomic_notifier_head panic_notifier_list; |
1da177e4 LT |
130 | extern long (*panic_blink)(long time); |
131 | NORET_TYPE void panic(const char * fmt, ...) | |
a586df06 | 132 | __attribute__ ((NORET_AND format (printf, 1, 2))) __cold; |
dd287796 AM |
133 | extern void oops_enter(void); |
134 | extern void oops_exit(void); | |
135 | extern int oops_may_print(void); | |
ec701584 | 136 | NORET_TYPE void do_exit(long error_code) |
1da177e4 LT |
137 | ATTRIB_NORET; |
138 | NORET_TYPE void complete_and_exit(struct completion *, long) | |
139 | ATTRIB_NORET; | |
140 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); | |
141 | extern long simple_strtol(const char *,char **,unsigned int); | |
142 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
143 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
06b2a76d YY |
144 | extern int strict_strtoul(const char *, unsigned int, unsigned long *); |
145 | extern int strict_strtol(const char *, unsigned int, long *); | |
146 | extern int strict_strtoull(const char *, unsigned int, unsigned long long *); | |
147 | extern int strict_strtoll(const char *, unsigned int, long long *); | |
1da177e4 LT |
148 | extern int sprintf(char * buf, const char * fmt, ...) |
149 | __attribute__ ((format (printf, 2, 3))); | |
150 | extern int vsprintf(char *buf, const char *, va_list) | |
151 | __attribute__ ((format (printf, 2, 0))); | |
152 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) | |
153 | __attribute__ ((format (printf, 3, 4))); | |
154 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
155 | __attribute__ ((format (printf, 3, 0))); | |
156 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) | |
157 | __attribute__ ((format (printf, 3, 4))); | |
158 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
159 | __attribute__ ((format (printf, 3, 0))); | |
e905914f JF |
160 | extern char *kasprintf(gfp_t gfp, const char *fmt, ...) |
161 | __attribute__ ((format (printf, 2, 3))); | |
11443ec7 | 162 | extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); |
1da177e4 LT |
163 | |
164 | extern int sscanf(const char *, const char *, ...) | |
165 | __attribute__ ((format (scanf, 2, 3))); | |
166 | extern int vsscanf(const char *, const char *, va_list) | |
167 | __attribute__ ((format (scanf, 2, 0))); | |
168 | ||
169 | extern int get_option(char **str, int *pint); | |
170 | extern char *get_options(const char *str, int nints, int *ints); | |
171 | extern unsigned long long memparse(char *ptr, char **retptr); | |
172 | ||
5e376613 | 173 | extern int core_kernel_text(unsigned long addr); |
1da177e4 LT |
174 | extern int __kernel_text_address(unsigned long addr); |
175 | extern int kernel_text_address(unsigned long addr); | |
04a2e6a5 EB |
176 | struct pid; |
177 | extern struct pid *session_of_pgrp(struct pid *pgrp); | |
1da177e4 | 178 | |
d59745ce | 179 | #ifdef CONFIG_PRINTK |
1da177e4 LT |
180 | asmlinkage int vprintk(const char *fmt, va_list args) |
181 | __attribute__ ((format (printf, 1, 0))); | |
182 | asmlinkage int printk(const char * fmt, ...) | |
a586df06 | 183 | __attribute__ ((format (printf, 1, 2))) __cold; |
0b15d04a MF |
184 | extern int log_buf_get_len(void); |
185 | extern int log_buf_read(int idx); | |
186 | extern int log_buf_copy(char *dest, int idx, int len); | |
7ef3d2fd JP |
187 | |
188 | extern int printk_ratelimit_jiffies; | |
189 | extern int printk_ratelimit_burst; | |
190 | extern int printk_ratelimit(void); | |
191 | extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); | |
192 | extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, | |
193 | unsigned int interval_msec); | |
d59745ce MM |
194 | #else |
195 | static inline int vprintk(const char *s, va_list args) | |
196 | __attribute__ ((format (printf, 1, 0))); | |
197 | static inline int vprintk(const char *s, va_list args) { return 0; } | |
198 | static inline int printk(const char *s, ...) | |
199 | __attribute__ ((format (printf, 1, 2))); | |
a586df06 | 200 | static inline int __cold printk(const char *s, ...) { return 0; } |
0b15d04a MF |
201 | static inline int log_buf_get_len(void) { return 0; } |
202 | static inline int log_buf_read(int idx) { return 0; } | |
203 | static inline int log_buf_copy(char *dest, int idx, int len) { return 0; } | |
7ef3d2fd JP |
204 | static inline int printk_ratelimit(void) { return 0; } |
205 | static inline int __printk_ratelimit(int ratelimit_jiffies, \ | |
206 | int ratelimit_burst) { return 0; } | |
207 | static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ | |
208 | unsigned int interval_msec) \ | |
209 | { return false; } | |
d59745ce | 210 | #endif |
1da177e4 | 211 | |
076f9776 IM |
212 | extern void __attribute__((format(printf, 1, 2))) |
213 | early_printk(const char *fmt, ...); | |
214 | ||
1da177e4 LT |
215 | unsigned long int_sqrt(unsigned long); |
216 | ||
1da177e4 LT |
217 | static inline void console_silent(void) |
218 | { | |
219 | console_loglevel = 0; | |
220 | } | |
221 | ||
222 | static inline void console_verbose(void) | |
223 | { | |
224 | if (console_loglevel) | |
225 | console_loglevel = 15; | |
226 | } | |
227 | ||
228 | extern void bust_spinlocks(int yes); | |
e3e8a75d | 229 | extern void wake_up_klogd(void); |
1da177e4 | 230 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
aa727107 | 231 | extern int panic_timeout; |
1da177e4 | 232 | extern int panic_on_oops; |
8da5adda | 233 | extern int panic_on_unrecovered_nmi; |
1da177e4 LT |
234 | extern int tainted; |
235 | extern const char *print_tainted(void); | |
236 | extern void add_taint(unsigned); | |
b920de1b | 237 | extern int root_mountflags; |
1da177e4 LT |
238 | |
239 | /* Values used for system_state */ | |
240 | extern enum system_states { | |
241 | SYSTEM_BOOTING, | |
242 | SYSTEM_RUNNING, | |
243 | SYSTEM_HALT, | |
244 | SYSTEM_POWER_OFF, | |
245 | SYSTEM_RESTART, | |
729b4d4c | 246 | SYSTEM_SUSPEND_DISK, |
1da177e4 LT |
247 | } system_state; |
248 | ||
249 | #define TAINT_PROPRIETARY_MODULE (1<<0) | |
250 | #define TAINT_FORCED_MODULE (1<<1) | |
251 | #define TAINT_UNSAFE_SMP (1<<2) | |
252 | #define TAINT_FORCED_RMMOD (1<<3) | |
253 | #define TAINT_MACHINE_CHECK (1<<4) | |
254 | #define TAINT_BAD_PAGE (1<<5) | |
34f5a398 | 255 | #define TAINT_USER (1<<6) |
bcdcd8e7 | 256 | #define TAINT_DIE (1<<7) |
6ed31e92 | 257 | #define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8) |
1da177e4 | 258 | |
a586df06 | 259 | extern void dump_stack(void) __cold; |
1da177e4 | 260 | |
99eaf3c4 RD |
261 | enum { |
262 | DUMP_PREFIX_NONE, | |
263 | DUMP_PREFIX_ADDRESS, | |
264 | DUMP_PREFIX_OFFSET | |
265 | }; | |
c7909234 RD |
266 | extern void hex_dump_to_buffer(const void *buf, size_t len, |
267 | int rowsize, int groupsize, | |
268 | char *linebuf, size_t linebuflen, bool ascii); | |
269 | extern void print_hex_dump(const char *level, const char *prefix_str, | |
270 | int prefix_type, int rowsize, int groupsize, | |
6a0ed91e | 271 | const void *buf, size_t len, bool ascii); |
c7909234 | 272 | extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, |
eb9a9a56 | 273 | const void *buf, size_t len); |
99eaf3c4 RD |
274 | #define hex_asc(x) "0123456789abcdef"[x] |
275 | ||
1f7c8234 EM |
276 | #define pr_emerg(fmt, arg...) \ |
277 | printk(KERN_EMERG fmt, ##arg) | |
278 | #define pr_alert(fmt, arg...) \ | |
279 | printk(KERN_ALERT fmt, ##arg) | |
280 | #define pr_crit(fmt, arg...) \ | |
281 | printk(KERN_CRIT fmt, ##arg) | |
282 | #define pr_err(fmt, arg...) \ | |
283 | printk(KERN_ERR fmt, ##arg) | |
284 | #define pr_warning(fmt, arg...) \ | |
285 | printk(KERN_WARNING fmt, ##arg) | |
286 | #define pr_notice(fmt, arg...) \ | |
287 | printk(KERN_NOTICE fmt, ##arg) | |
288 | #define pr_info(fmt, arg...) \ | |
289 | printk(KERN_INFO fmt, ##arg) | |
290 | ||
1da177e4 | 291 | #ifdef DEBUG |
1cc6daf2 | 292 | /* If you are writing a driver, please use dev_dbg instead */ |
1f7c8234 EM |
293 | #define pr_debug(fmt, arg...) \ |
294 | printk(KERN_DEBUG fmt, ##arg) | |
1da177e4 | 295 | #else |
8b2a1fd1 ZB |
296 | static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...) |
297 | { | |
298 | return 0; | |
299 | } | |
1da177e4 LT |
300 | #endif |
301 | ||
1da177e4 LT |
302 | /* |
303 | * Display an IP address in readable format. | |
304 | */ | |
305 | ||
306 | #define NIPQUAD(addr) \ | |
307 | ((unsigned char *)&addr)[0], \ | |
308 | ((unsigned char *)&addr)[1], \ | |
309 | ((unsigned char *)&addr)[2], \ | |
310 | ((unsigned char *)&addr)[3] | |
46b86a2d | 311 | #define NIPQUAD_FMT "%u.%u.%u.%u" |
1da177e4 LT |
312 | |
313 | #define NIP6(addr) \ | |
314 | ntohs((addr).s6_addr16[0]), \ | |
315 | ntohs((addr).s6_addr16[1]), \ | |
316 | ntohs((addr).s6_addr16[2]), \ | |
317 | ntohs((addr).s6_addr16[3]), \ | |
318 | ntohs((addr).s6_addr16[4]), \ | |
319 | ntohs((addr).s6_addr16[5]), \ | |
320 | ntohs((addr).s6_addr16[6]), \ | |
321 | ntohs((addr).s6_addr16[7]) | |
46b86a2d | 322 | #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" |
9343e79a | 323 | #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x" |
1da177e4 LT |
324 | |
325 | #if defined(__LITTLE_ENDIAN) | |
326 | #define HIPQUAD(addr) \ | |
327 | ((unsigned char *)&addr)[3], \ | |
328 | ((unsigned char *)&addr)[2], \ | |
329 | ((unsigned char *)&addr)[1], \ | |
330 | ((unsigned char *)&addr)[0] | |
331 | #elif defined(__BIG_ENDIAN) | |
332 | #define HIPQUAD NIPQUAD | |
333 | #else | |
334 | #error "Please fix asm/byteorder.h" | |
335 | #endif /* __LITTLE_ENDIAN */ | |
336 | ||
337 | /* | |
338 | * min()/max() macros that also do | |
339 | * strict type-checking.. See the | |
340 | * "unnecessary" pointer comparison. | |
341 | */ | |
342 | #define min(x,y) ({ \ | |
343 | typeof(x) _x = (x); \ | |
344 | typeof(y) _y = (y); \ | |
345 | (void) (&_x == &_y); \ | |
346 | _x < _y ? _x : _y; }) | |
347 | ||
348 | #define max(x,y) ({ \ | |
349 | typeof(x) _x = (x); \ | |
350 | typeof(y) _y = (y); \ | |
351 | (void) (&_x == &_y); \ | |
352 | _x > _y ? _x : _y; }) | |
353 | ||
354 | /* | |
355 | * ..and if you can't take the strict | |
356 | * types, you can specify one yourself. | |
357 | * | |
358 | * Or not use min/max at all, of course. | |
359 | */ | |
360 | #define min_t(type,x,y) \ | |
361 | ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) | |
362 | #define max_t(type,x,y) \ | |
363 | ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) | |
364 | ||
365 | ||
366 | /** | |
367 | * container_of - cast a member of a structure out to the containing structure | |
1da177e4 LT |
368 | * @ptr: the pointer to the member. |
369 | * @type: the type of the container struct this is embedded in. | |
370 | * @member: the name of the member within the struct. | |
371 | * | |
372 | */ | |
373 | #define container_of(ptr, type, member) ({ \ | |
78db2ad6 DW |
374 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
375 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
1da177e4 LT |
376 | |
377 | /* | |
378 | * Check at compile time that something is of a particular type. | |
379 | * Always evaluates to 1 so you may use it easily in comparisons. | |
380 | */ | |
381 | #define typecheck(type,x) \ | |
382 | ({ type __dummy; \ | |
383 | typeof(x) __dummy2; \ | |
384 | (void)(&__dummy == &__dummy2); \ | |
385 | 1; \ | |
386 | }) | |
387 | ||
711a660d CE |
388 | /* |
389 | * Check at compile time that 'function' is a certain type, or is a pointer | |
390 | * to that type (needs to use typedef for the function type.) | |
391 | */ | |
392 | #define typecheck_fn(type,function) \ | |
393 | ({ typeof(type) __tmp = function; \ | |
394 | (void)__tmp; \ | |
395 | }) | |
396 | ||
d4d23add KM |
397 | struct sysinfo; |
398 | extern int do_sysinfo(struct sysinfo *info); | |
399 | ||
1da177e4 LT |
400 | #endif /* __KERNEL__ */ |
401 | ||
402 | #define SI_LOAD_SHIFT 16 | |
403 | struct sysinfo { | |
404 | long uptime; /* Seconds since boot */ | |
405 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ | |
406 | unsigned long totalram; /* Total usable main memory size */ | |
407 | unsigned long freeram; /* Available memory size */ | |
408 | unsigned long sharedram; /* Amount of shared memory */ | |
409 | unsigned long bufferram; /* Memory used by buffers */ | |
410 | unsigned long totalswap; /* Total swap space size */ | |
411 | unsigned long freeswap; /* swap space still available */ | |
412 | unsigned short procs; /* Number of current processes */ | |
413 | unsigned short pad; /* explicit padding for m68k */ | |
414 | unsigned long totalhigh; /* Total high memory size */ | |
415 | unsigned long freehigh; /* Available high memory size */ | |
416 | unsigned int mem_unit; /* Memory unit size in bytes */ | |
417 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ | |
418 | }; | |
419 | ||
c0398ee6 | 420 | /* Force a compilation error if condition is true */ |
921717a2 | 421 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
1da177e4 | 422 | |
4552d5dc JB |
423 | /* Force a compilation error if condition is true, but also produce a |
424 | result (of value 0 and type size_t), so the expression can be used | |
425 | e.g. in a structure initializer (or where-ever else comma expressions | |
426 | aren't permitted). */ | |
427 | #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) | |
428 | ||
1da177e4 | 429 | /* Trap pasters of __FUNCTION__ at compile-time */ |
1da177e4 | 430 | #define __FUNCTION__ (__func__) |
1da177e4 | 431 | |
08e0f6a9 CL |
432 | /* This helps us to avoid #ifdef CONFIG_NUMA */ |
433 | #ifdef CONFIG_NUMA | |
434 | #define NUMA_BUILD 1 | |
435 | #else | |
436 | #define NUMA_BUILD 0 | |
437 | #endif | |
438 | ||
1da177e4 | 439 | #endif |