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