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>
16 #include <linux/log2.h>
17 #include <asm/byteorder.h>
18 #include <asm/bug.h>
19
20 extern const char linux_banner[];
21 extern const char linux_proc_banner[];
22
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)
29 #define LLONG_MAX ((long long)(~0ULL>>1))
30 #define LLONG_MIN (-LLONG_MAX - 1)
31 #define ULLONG_MAX (~0ULL)
32
33 #define STACK_MAGIC 0xdeadbeef
34
35 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)
36 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))
37 #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))
38 #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
39
40 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
41
42 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
43 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
44 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
45
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
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
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
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
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;
94 struct pt_regs;
95 struct user;
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
104 * be bitten later when the calling function happens to sleep when it is not
105 * supposed to.
106 */
107 #ifdef CONFIG_PREEMPT_VOLUNTARY
108 extern int _cond_resched(void);
109 # define might_resched() _cond_resched()
110 #else
111 # define might_resched() do { } while (0)
112 #endif
113
114 #if defined(CONFIG_DEBUG_SPINLOCK_SLEEP) || defined(CONFIG_DEBUG_PREEMPT)
115 void __might_sleep(char *file, int line);
116 # define might_sleep() \
117 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
118 #else
119 # define might_sleep() do { might_resched(); } while (0)
120 #endif
121
122 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
123
124 #define abs(x) ({ \
125 int __x = (x); \
126 (__x < 0) ? -__x : __x; \
127 })
128
129 extern struct atomic_notifier_head panic_notifier_list;
130 extern long (*panic_blink)(long time);
131 NORET_TYPE void panic(const char * fmt, ...)
132 __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;
133 extern void oops_enter(void);
134 extern void oops_exit(void);
135 extern int oops_may_print(void);
136 NORET_TYPE void do_exit(long error_code)
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);
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 *);
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)));
160 extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
161 __attribute__ ((format (printf, 2, 3)));
162 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);
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
173 extern int core_kernel_text(unsigned long addr);
174 extern int __kernel_text_address(unsigned long addr);
175 extern int kernel_text_address(unsigned long addr);
176 struct pid;
177 extern struct pid *session_of_pgrp(struct pid *pgrp);
178
179 #ifdef CONFIG_PRINTK
180 asmlinkage int vprintk(const char *fmt, va_list args)
181 __attribute__ ((format (printf, 1, 0)));
182 asmlinkage int printk(const char * fmt, ...)
183 __attribute__ ((format (printf, 1, 2))) __cold;
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);
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);
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)));
200 static inline int __cold printk(const char *s, ...) { return 0; }
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; }
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; }
210 #endif
211
212 extern void __attribute__((format(printf, 1, 2)))
213 early_printk(const char *fmt, ...);
214
215 #ifdef CONFIG_PREEMPT_RT
216 extern void zap_rt_locks(void);
217 #else
218 # define zap_rt_locks() do { } while (0)
219 #endif
220
221 #ifdef CONFIG_PREEMPT_RT
222 extern void zap_rt_locks(void);
223 #else
224 # define zap_rt_locks() do { } while (0)
225 #endif
226
227 unsigned long int_sqrt(unsigned long);
228
229 static inline void console_silent(void)
230 {
231 console_loglevel = 0;
232 }
233
234 static inline void console_verbose(void)
235 {
236 if (console_loglevel)
237 console_loglevel = 15;
238 }
239
240 extern void bust_spinlocks(int yes);
241 extern void wake_up_klogd(void);
242 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
243 extern int panic_timeout;
244 extern int panic_on_oops;
245
246 extern void pause_on_oops_head(void);
247 extern void pause_on_oops_tail(void);
248
249 extern int panic_on_unrecovered_nmi;
250 extern int tainted;
251 extern const char *print_tainted(void);
252 extern void add_taint(unsigned);
253 extern int root_mountflags;
254
255 /* Values used for system_state */
256 extern enum system_states {
257 SYSTEM_BOOTING,
258 SYSTEM_BOOTING_SCHEDULER_OK,
259 SYSTEM_RUNNING,
260 SYSTEM_HALT,
261 SYSTEM_POWER_OFF,
262 SYSTEM_RESTART,
263 SYSTEM_SUSPEND_DISK,
264 } system_state;
265
266 #define TAINT_PROPRIETARY_MODULE (1<<0)
267 #define TAINT_FORCED_MODULE (1<<1)
268 #define TAINT_UNSAFE_SMP (1<<2)
269 #define TAINT_FORCED_RMMOD (1<<3)
270 #define TAINT_MACHINE_CHECK (1<<4)
271 #define TAINT_BAD_PAGE (1<<5)
272 #define TAINT_USER (1<<6)
273 #define TAINT_DIE (1<<7)
274 #define TAINT_OVERRIDDEN_ACPI_TABLE (1<<8)
275
276 extern void dump_stack(void) __cold;
277
278 enum {
279 DUMP_PREFIX_NONE,
280 DUMP_PREFIX_ADDRESS,
281 DUMP_PREFIX_OFFSET
282 };
283 extern void hex_dump_to_buffer(const void *buf, size_t len,
284 int rowsize, int groupsize,
285 char *linebuf, size_t linebuflen, bool ascii);
286 extern void print_hex_dump(const char *level, const char *prefix_str,
287 int prefix_type, int rowsize, int groupsize,
288 const void *buf, size_t len, bool ascii);
289 extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
290 const void *buf, size_t len);
291 #define hex_asc(x) "0123456789abcdef"[x]
292
293 #define pr_emerg(fmt, arg...) \
294 printk(KERN_EMERG fmt, ##arg)
295 #define pr_alert(fmt, arg...) \
296 printk(KERN_ALERT fmt, ##arg)
297 #define pr_crit(fmt, arg...) \
298 printk(KERN_CRIT fmt, ##arg)
299 #define pr_err(fmt, arg...) \
300 printk(KERN_ERR fmt, ##arg)
301 #define pr_warning(fmt, arg...) \
302 printk(KERN_WARNING fmt, ##arg)
303 #define pr_notice(fmt, arg...) \
304 printk(KERN_NOTICE fmt, ##arg)
305 #define pr_info(fmt, arg...) \
306 printk(KERN_INFO fmt, ##arg)
307
308 #ifdef DEBUG
309 /* If you are writing a driver, please use dev_dbg instead */
310 #define pr_debug(fmt, arg...) \
311 printk(KERN_DEBUG fmt, ##arg)
312 #else
313 static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...)
314 {
315 return 0;
316 }
317 #endif
318
319 /*
320 * Display an IP address in readable format.
321 */
322
323 #define NIPQUAD(addr) \
324 ((unsigned char *)&addr)[0], \
325 ((unsigned char *)&addr)[1], \
326 ((unsigned char *)&addr)[2], \
327 ((unsigned char *)&addr)[3]
328 #define NIPQUAD_FMT "%u.%u.%u.%u"
329
330 #define NIP6(addr) \
331 ntohs((addr).s6_addr16[0]), \
332 ntohs((addr).s6_addr16[1]), \
333 ntohs((addr).s6_addr16[2]), \
334 ntohs((addr).s6_addr16[3]), \
335 ntohs((addr).s6_addr16[4]), \
336 ntohs((addr).s6_addr16[5]), \
337 ntohs((addr).s6_addr16[6]), \
338 ntohs((addr).s6_addr16[7])
339 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
340 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x"
341
342 #if defined(__LITTLE_ENDIAN)
343 #define HIPQUAD(addr) \
344 ((unsigned char *)&addr)[3], \
345 ((unsigned char *)&addr)[2], \
346 ((unsigned char *)&addr)[1], \
347 ((unsigned char *)&addr)[0]
348 #elif defined(__BIG_ENDIAN)
349 #define HIPQUAD NIPQUAD
350 #else
351 #error "Please fix asm/byteorder.h"
352 #endif /* __LITTLE_ENDIAN */
353
354 /*
355 * min()/max() macros that also do
356 * strict type-checking.. See the
357 * "unnecessary" pointer comparison.
358 */
359 #define min(x,y) ({ \
360 typeof(x) _x = (x); \
361 typeof(y) _y = (y); \
362 (void) (&_x == &_y); \
363 _x < _y ? _x : _y; })
364
365 #define max(x,y) ({ \
366 typeof(x) _x = (x); \
367 typeof(y) _y = (y); \
368 (void) (&_x == &_y); \
369 _x > _y ? _x : _y; })
370
371 /*
372 * ..and if you can't take the strict
373 * types, you can specify one yourself.
374 *
375 * Or not use min/max at all, of course.
376 */
377 #define min_t(type,x,y) \
378 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
379 #define max_t(type,x,y) \
380 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
381
382
383 /**
384 * container_of - cast a member of a structure out to the containing structure
385 * @ptr: the pointer to the member.
386 * @type: the type of the container struct this is embedded in.
387 * @member: the name of the member within the struct.
388 *
389 */
390 #define container_of(ptr, type, member) ({ \
391 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
392 (type *)( (char *)__mptr - offsetof(type,member) );})
393
394 /*
395 * Check at compile time that something is of a particular type.
396 * Always evaluates to 1 so you may use it easily in comparisons.
397 */
398 #define typecheck(type,x) \
399 ({ type __dummy; \
400 typeof(x) __dummy2; \
401 (void)(&__dummy == &__dummy2); \
402 1; \
403 })
404
405 /*
406 * Check at compile time that 'function' is a certain type, or is a pointer
407 * to that type (needs to use typedef for the function type.)
408 */
409 #define typecheck_fn(type,function) \
410 ({ typeof(type) __tmp = function; \
411 (void)__tmp; \
412 })
413
414 struct sysinfo;
415 extern int do_sysinfo(struct sysinfo *info);
416
417 #endif /* __KERNEL__ */
418
419 #define SI_LOAD_SHIFT 16
420 struct sysinfo {
421 long uptime; /* Seconds since boot */
422 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
423 unsigned long totalram; /* Total usable main memory size */
424 unsigned long freeram; /* Available memory size */
425 unsigned long sharedram; /* Amount of shared memory */
426 unsigned long bufferram; /* Memory used by buffers */
427 unsigned long totalswap; /* Total swap space size */
428 unsigned long freeswap; /* swap space still available */
429 unsigned short procs; /* Number of current processes */
430 unsigned short pad; /* explicit padding for m68k */
431 unsigned long totalhigh; /* Total high memory size */
432 unsigned long freehigh; /* Available high memory size */
433 unsigned int mem_unit; /* Memory unit size in bytes */
434 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
435 };
436
437 /* Force a compilation error if condition is true */
438 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
439
440 /* Force a compilation error if condition is true, but also produce a
441 result (of value 0 and type size_t), so the expression can be used
442 e.g. in a structure initializer (or where-ever else comma expressions
443 aren't permitted). */
444 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
445
446 /* Trap pasters of __FUNCTION__ at compile-time */
447 #define __FUNCTION__ (__func__)
448
449 /* This helps us to avoid #ifdef CONFIG_NUMA */
450 #ifdef CONFIG_NUMA
451 #define NUMA_BUILD 1
452 #else
453 #define NUMA_BUILD 0
454 #endif
455
456 #endif
457
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