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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> | |
16 | #include <asm/byteorder.h> | |
17 | #include <asm/bug.h> | |
18 | ||
19 | extern const char linux_banner[]; | |
20 | ||
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 | ||
28 | #define STACK_MAGIC 0xdeadbeef | |
29 | ||
30 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) | |
31 | #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1)) | |
32 | ||
33 | #define KERN_EMERG "<0>" /* system is unusable */ | |
34 | #define KERN_ALERT "<1>" /* action must be taken immediately */ | |
35 | #define KERN_CRIT "<2>" /* critical conditions */ | |
36 | #define KERN_ERR "<3>" /* error conditions */ | |
37 | #define KERN_WARNING "<4>" /* warning conditions */ | |
38 | #define KERN_NOTICE "<5>" /* normal but significant condition */ | |
39 | #define KERN_INFO "<6>" /* informational */ | |
40 | #define KERN_DEBUG "<7>" /* debug-level messages */ | |
41 | ||
42 | extern int console_printk[]; | |
43 | ||
44 | #define console_loglevel (console_printk[0]) | |
45 | #define default_message_loglevel (console_printk[1]) | |
46 | #define minimum_console_loglevel (console_printk[2]) | |
47 | #define default_console_loglevel (console_printk[3]) | |
48 | ||
49 | struct completion; | |
50 | ||
51 | /** | |
52 | * might_sleep - annotation for functions that can sleep | |
53 | * | |
54 | * this macro will print a stack trace if it is executed in an atomic | |
55 | * context (spinlock, irq-handler, ...). | |
56 | * | |
57 | * This is a useful debugging help to be able to catch problems early and not | |
58 | * be biten later when the calling function happens to sleep when it is not | |
59 | * supposed to. | |
60 | */ | |
f8cbd99b IM |
61 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
62 | extern int cond_resched(void); | |
63 | # define might_resched() cond_resched() | |
64 | #else | |
65 | # define might_resched() do { } while (0) | |
66 | #endif | |
67 | ||
1da177e4 | 68 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
f8cbd99b IM |
69 | void __might_sleep(char *file, int line); |
70 | # define might_sleep() \ | |
71 | do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) | |
1da177e4 | 72 | #else |
f8cbd99b | 73 | # define might_sleep() do { might_resched(); } while (0) |
1da177e4 LT |
74 | #endif |
75 | ||
f8cbd99b IM |
76 | #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0) |
77 | ||
1da177e4 LT |
78 | #define abs(x) ({ \ |
79 | int __x = (x); \ | |
80 | (__x < 0) ? -__x : __x; \ | |
81 | }) | |
82 | ||
83 | #define labs(x) ({ \ | |
84 | long __x = (x); \ | |
85 | (__x < 0) ? -__x : __x; \ | |
86 | }) | |
87 | ||
88 | extern struct notifier_block *panic_notifier_list; | |
89 | extern long (*panic_blink)(long time); | |
90 | NORET_TYPE void panic(const char * fmt, ...) | |
91 | __attribute__ ((NORET_AND format (printf, 1, 2))); | |
92 | fastcall NORET_TYPE void do_exit(long error_code) | |
93 | ATTRIB_NORET; | |
94 | NORET_TYPE void complete_and_exit(struct completion *, long) | |
95 | ATTRIB_NORET; | |
96 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); | |
97 | extern long simple_strtol(const char *,char **,unsigned int); | |
98 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); | |
99 | extern long long simple_strtoll(const char *,char **,unsigned int); | |
100 | extern int sprintf(char * buf, const char * fmt, ...) | |
101 | __attribute__ ((format (printf, 2, 3))); | |
102 | extern int vsprintf(char *buf, const char *, va_list) | |
103 | __attribute__ ((format (printf, 2, 0))); | |
104 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) | |
105 | __attribute__ ((format (printf, 3, 4))); | |
106 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
107 | __attribute__ ((format (printf, 3, 0))); | |
108 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) | |
109 | __attribute__ ((format (printf, 3, 4))); | |
110 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) | |
111 | __attribute__ ((format (printf, 3, 0))); | |
112 | ||
113 | extern int sscanf(const char *, const char *, ...) | |
114 | __attribute__ ((format (scanf, 2, 3))); | |
115 | extern int vsscanf(const char *, const char *, va_list) | |
116 | __attribute__ ((format (scanf, 2, 0))); | |
117 | ||
118 | extern int get_option(char **str, int *pint); | |
119 | extern char *get_options(const char *str, int nints, int *ints); | |
120 | extern unsigned long long memparse(char *ptr, char **retptr); | |
121 | ||
122 | extern int __kernel_text_address(unsigned long addr); | |
123 | extern int kernel_text_address(unsigned long addr); | |
124 | extern int session_of_pgrp(int pgrp); | |
125 | ||
d59745ce | 126 | #ifdef CONFIG_PRINTK |
1da177e4 LT |
127 | asmlinkage int vprintk(const char *fmt, va_list args) |
128 | __attribute__ ((format (printf, 1, 0))); | |
129 | asmlinkage int printk(const char * fmt, ...) | |
130 | __attribute__ ((format (printf, 1, 2))); | |
d59745ce MM |
131 | #else |
132 | static inline int vprintk(const char *s, va_list args) | |
133 | __attribute__ ((format (printf, 1, 0))); | |
134 | static inline int vprintk(const char *s, va_list args) { return 0; } | |
135 | static inline int printk(const char *s, ...) | |
136 | __attribute__ ((format (printf, 1, 2))); | |
137 | static inline int printk(const char *s, ...) { return 0; } | |
138 | #endif | |
1da177e4 LT |
139 | |
140 | unsigned long int_sqrt(unsigned long); | |
141 | ||
142 | static inline int __attribute_pure__ long_log2(unsigned long x) | |
143 | { | |
144 | int r = 0; | |
145 | for (x >>= 1; x > 0; x >>= 1) | |
146 | r++; | |
147 | return r; | |
148 | } | |
149 | ||
150 | static inline unsigned long __attribute_const__ roundup_pow_of_two(unsigned long x) | |
151 | { | |
152 | return (1UL << fls(x - 1)); | |
153 | } | |
154 | ||
155 | extern int printk_ratelimit(void); | |
156 | extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); | |
157 | ||
158 | static inline void console_silent(void) | |
159 | { | |
160 | console_loglevel = 0; | |
161 | } | |
162 | ||
163 | static inline void console_verbose(void) | |
164 | { | |
165 | if (console_loglevel) | |
166 | console_loglevel = 15; | |
167 | } | |
168 | ||
169 | extern void bust_spinlocks(int yes); | |
170 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ | |
171 | extern int panic_timeout; | |
172 | extern int panic_on_oops; | |
173 | extern int tainted; | |
174 | extern const char *print_tainted(void); | |
175 | extern void add_taint(unsigned); | |
176 | ||
177 | /* Values used for system_state */ | |
178 | extern enum system_states { | |
179 | SYSTEM_BOOTING, | |
180 | SYSTEM_RUNNING, | |
181 | SYSTEM_HALT, | |
182 | SYSTEM_POWER_OFF, | |
183 | SYSTEM_RESTART, | |
184 | } system_state; | |
185 | ||
186 | #define TAINT_PROPRIETARY_MODULE (1<<0) | |
187 | #define TAINT_FORCED_MODULE (1<<1) | |
188 | #define TAINT_UNSAFE_SMP (1<<2) | |
189 | #define TAINT_FORCED_RMMOD (1<<3) | |
190 | #define TAINT_MACHINE_CHECK (1<<4) | |
191 | #define TAINT_BAD_PAGE (1<<5) | |
192 | ||
193 | extern void dump_stack(void); | |
194 | ||
195 | #ifdef DEBUG | |
196 | #define pr_debug(fmt,arg...) \ | |
197 | printk(KERN_DEBUG fmt,##arg) | |
198 | #else | |
199 | #define pr_debug(fmt,arg...) \ | |
200 | do { } while (0) | |
201 | #endif | |
202 | ||
203 | #define pr_info(fmt,arg...) \ | |
204 | printk(KERN_INFO fmt,##arg) | |
205 | ||
206 | /* | |
207 | * Display an IP address in readable format. | |
208 | */ | |
209 | ||
210 | #define NIPQUAD(addr) \ | |
211 | ((unsigned char *)&addr)[0], \ | |
212 | ((unsigned char *)&addr)[1], \ | |
213 | ((unsigned char *)&addr)[2], \ | |
214 | ((unsigned char *)&addr)[3] | |
215 | ||
216 | #define NIP6(addr) \ | |
217 | ntohs((addr).s6_addr16[0]), \ | |
218 | ntohs((addr).s6_addr16[1]), \ | |
219 | ntohs((addr).s6_addr16[2]), \ | |
220 | ntohs((addr).s6_addr16[3]), \ | |
221 | ntohs((addr).s6_addr16[4]), \ | |
222 | ntohs((addr).s6_addr16[5]), \ | |
223 | ntohs((addr).s6_addr16[6]), \ | |
224 | ntohs((addr).s6_addr16[7]) | |
225 | ||
226 | #if defined(__LITTLE_ENDIAN) | |
227 | #define HIPQUAD(addr) \ | |
228 | ((unsigned char *)&addr)[3], \ | |
229 | ((unsigned char *)&addr)[2], \ | |
230 | ((unsigned char *)&addr)[1], \ | |
231 | ((unsigned char *)&addr)[0] | |
232 | #elif defined(__BIG_ENDIAN) | |
233 | #define HIPQUAD NIPQUAD | |
234 | #else | |
235 | #error "Please fix asm/byteorder.h" | |
236 | #endif /* __LITTLE_ENDIAN */ | |
237 | ||
238 | /* | |
239 | * min()/max() macros that also do | |
240 | * strict type-checking.. See the | |
241 | * "unnecessary" pointer comparison. | |
242 | */ | |
243 | #define min(x,y) ({ \ | |
244 | typeof(x) _x = (x); \ | |
245 | typeof(y) _y = (y); \ | |
246 | (void) (&_x == &_y); \ | |
247 | _x < _y ? _x : _y; }) | |
248 | ||
249 | #define max(x,y) ({ \ | |
250 | typeof(x) _x = (x); \ | |
251 | typeof(y) _y = (y); \ | |
252 | (void) (&_x == &_y); \ | |
253 | _x > _y ? _x : _y; }) | |
254 | ||
255 | /* | |
256 | * ..and if you can't take the strict | |
257 | * types, you can specify one yourself. | |
258 | * | |
259 | * Or not use min/max at all, of course. | |
260 | */ | |
261 | #define min_t(type,x,y) \ | |
262 | ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) | |
263 | #define max_t(type,x,y) \ | |
264 | ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) | |
265 | ||
266 | ||
267 | /** | |
268 | * container_of - cast a member of a structure out to the containing structure | |
269 | * | |
270 | * @ptr: the pointer to the member. | |
271 | * @type: the type of the container struct this is embedded in. | |
272 | * @member: the name of the member within the struct. | |
273 | * | |
274 | */ | |
275 | #define container_of(ptr, type, member) ({ \ | |
276 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ | |
277 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
278 | ||
279 | /* | |
280 | * Check at compile time that something is of a particular type. | |
281 | * Always evaluates to 1 so you may use it easily in comparisons. | |
282 | */ | |
283 | #define typecheck(type,x) \ | |
284 | ({ type __dummy; \ | |
285 | typeof(x) __dummy2; \ | |
286 | (void)(&__dummy == &__dummy2); \ | |
287 | 1; \ | |
288 | }) | |
289 | ||
290 | #endif /* __KERNEL__ */ | |
291 | ||
292 | #define SI_LOAD_SHIFT 16 | |
293 | struct sysinfo { | |
294 | long uptime; /* Seconds since boot */ | |
295 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ | |
296 | unsigned long totalram; /* Total usable main memory size */ | |
297 | unsigned long freeram; /* Available memory size */ | |
298 | unsigned long sharedram; /* Amount of shared memory */ | |
299 | unsigned long bufferram; /* Memory used by buffers */ | |
300 | unsigned long totalswap; /* Total swap space size */ | |
301 | unsigned long freeswap; /* swap space still available */ | |
302 | unsigned short procs; /* Number of current processes */ | |
303 | unsigned short pad; /* explicit padding for m68k */ | |
304 | unsigned long totalhigh; /* Total high memory size */ | |
305 | unsigned long freehigh; /* Available high memory size */ | |
306 | unsigned int mem_unit; /* Memory unit size in bytes */ | |
307 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ | |
308 | }; | |
309 | ||
921717a2 AK |
310 | /* Force a compilation error if condition is false */ |
311 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) | |
1da177e4 LT |
312 | |
313 | #ifdef CONFIG_SYSCTL | |
314 | extern int randomize_va_space; | |
315 | #else | |
316 | #define randomize_va_space 1 | |
317 | #endif | |
318 | ||
319 | /* Trap pasters of __FUNCTION__ at compile-time */ | |
320 | #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95 | |
321 | #define __FUNCTION__ (__func__) | |
322 | #endif | |
323 | ||
324 | #endif |