1 #ifndef _LINUX_KERNEL_H
2 #define _LINUX_KERNEL_H
5 * 'kernel.h' contains some often-used function prototypes etc
11 #include <linux/linkage.h>
12 #include <linux/stddef.h>
13 #include <linux/types.h>
14 #include <linux/compiler.h>
15 #include <asm/byteorder.h>
18 #define INT_MAX ((int)(~0U>>1))
19 #define INT_MIN (-INT_MAX - 1)
20 #define UINT_MAX (~0U)
21 #define LONG_MAX ((long)(~0UL>>1))
22 #define LONG_MIN (-LONG_MAX - 1)
23 #define ULONG_MAX (~0UL)
25 #define STACK_MAGIC 0xdeadbeef
27 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
28 #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1))
30 #define KERN_EMERG "<0>" /* system is unusable */
31 #define KERN_ALERT "<1>" /* action must be taken immediately */
32 #define KERN_CRIT "<2>" /* critical conditions */
33 #define KERN_ERR "<3>" /* error conditions */
34 #define KERN_WARNING "<4>" /* warning conditions */
35 #define KERN_NOTICE "<5>" /* normal but significant condition */
36 #define KERN_INFO "<6>" /* informational */
37 #define KERN_DEBUG "<7>" /* debug-level messages */
39 extern int console_printk[];
41 #define console_loglevel (console_printk[0])
42 #define default_message_loglevel (console_printk[1])
43 #define minimum_console_loglevel (console_printk[2])
44 #define default_console_loglevel (console_printk[3])
48 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
49 void __might_sleep(char *file, int line);
50 #define might_sleep() __might_sleep(__FILE__, __LINE__)
51 #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
53 #define might_sleep() do {} while(0)
54 #define might_sleep_if(cond) do {} while (0)
59 (__x < 0) ? -__x : __x; \
64 (__x < 0) ? -__x : __x; \
67 extern struct notifier_block *panic_notifier_list;
68 NORET_TYPE void panic(const char * fmt, ...)
69 __attribute__ ((NORET_AND format (printf, 1, 2)));
70 asmlinkage NORET_TYPE void do_exit(long error_code)
72 NORET_TYPE void complete_and_exit(struct completion *, long)
74 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
75 extern long simple_strtol(const char *,char **,unsigned int);
76 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
77 extern long long simple_strtoll(const char *,char **,unsigned int);
78 extern int sprintf(char * buf, const char * fmt, ...)
79 __attribute__ ((format (printf, 2, 3)));
80 extern int vsprintf(char *buf, const char *, va_list);
81 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
82 __attribute__ ((format (printf, 3, 4)));
83 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
84 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
85 __attribute__ ((format (printf, 3, 4)));
86 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
88 extern int sscanf(const char *, const char *, ...)
89 __attribute__ ((format (scanf,2,3)));
90 extern int vsscanf(const char *, const char *, va_list);
92 extern int get_option(char **str, int *pint);
93 extern char *get_options(const char *str, int nints, int *ints);
94 extern unsigned long long memparse(char *ptr, char **retptr);
96 extern int __kernel_text_address(unsigned long addr);
97 extern int kernel_text_address(unsigned long addr);
98 extern int session_of_pgrp(int pgrp);
100 asmlinkage int printk(const char * fmt, ...)
101 __attribute__ ((format (printf, 1, 2)));
103 unsigned long int_sqrt(unsigned long);
105 static inline int __attribute_pure__ long_log2(unsigned long x)
108 for (x >>= 1; x > 0; x >>= 1)
114 extern int printk_ratelimit(void);
115 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
117 static inline void console_silent(void)
119 console_loglevel = 0;
122 static inline void console_verbose(void)
124 if (console_loglevel)
125 console_loglevel = 15;
128 extern void bust_spinlocks(int yes);
129 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
130 extern int panic_on_oops;
132 extern const char *print_tainted(void);
134 /* Values used for system_state */
135 extern enum system_states {
143 #define TAINT_PROPRIETARY_MODULE (1<<0)
144 #define TAINT_FORCED_MODULE (1<<1)
145 #define TAINT_UNSAFE_SMP (1<<2)
146 #define TAINT_FORCED_RMMOD (1<<3)
148 extern void dump_stack(void);
151 #define pr_debug(fmt,arg...) \
152 printk(KERN_DEBUG fmt,##arg)
154 #define pr_debug(fmt,arg...) \
158 #define pr_info(fmt,arg...) \
159 printk(KERN_INFO fmt,##arg)
162 * Display an IP address in readable format.
165 #define NIPQUAD(addr) \
166 ((unsigned char *)&addr)[0], \
167 ((unsigned char *)&addr)[1], \
168 ((unsigned char *)&addr)[2], \
169 ((unsigned char *)&addr)[3]
172 ntohs((addr).s6_addr16[0]), \
173 ntohs((addr).s6_addr16[1]), \
174 ntohs((addr).s6_addr16[2]), \
175 ntohs((addr).s6_addr16[3]), \
176 ntohs((addr).s6_addr16[4]), \
177 ntohs((addr).s6_addr16[5]), \
178 ntohs((addr).s6_addr16[6]), \
179 ntohs((addr).s6_addr16[7])
181 #if defined(__LITTLE_ENDIAN)
182 #define HIPQUAD(addr) \
183 ((unsigned char *)&addr)[3], \
184 ((unsigned char *)&addr)[2], \
185 ((unsigned char *)&addr)[1], \
186 ((unsigned char *)&addr)[0]
187 #elif defined(__BIG_ENDIAN)
188 #define HIPQUAD NIPQUAD
190 #error "Please fix asm/byteorder.h"
191 #endif /* __LITTLE_ENDIAN */
194 * min()/max() macros that also do
195 * strict type-checking.. See the
196 * "unnecessary" pointer comparison.
198 #define min(x,y) ({ \
199 typeof(x) _x = (x); \
200 typeof(y) _y = (y); \
201 (void) (&_x == &_y); \
202 _x < _y ? _x : _y; })
204 #define max(x,y) ({ \
205 typeof(x) _x = (x); \
206 typeof(y) _y = (y); \
207 (void) (&_x == &_y); \
208 _x > _y ? _x : _y; })
211 * ..and if you can't take the strict
212 * types, you can specify one yourself.
214 * Or not use min/max at all, of course.
216 #define min_t(type,x,y) \
217 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
218 #define max_t(type,x,y) \
219 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
223 * container_of - cast a member of a structure out to the containing structure
225 * @ptr: the pointer to the member.
226 * @type: the type of the container struct this is embedded in.
227 * @member: the name of the member within the struct.
230 #define container_of(ptr, type, member) ({ \
231 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
232 (type *)( (char *)__mptr - offsetof(type,member) );})
235 * Check at compile time that something is of a particular type.
236 * Always evaluates to 1 so you may use it easily in comparisons.
238 #define typecheck(type,x) \
240 typeof(x) __dummy2; \
241 (void)(&__dummy == &__dummy2); \
245 #endif /* __KERNEL__ */
247 #define SI_LOAD_SHIFT 16
249 long uptime; /* Seconds since boot */
250 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
251 unsigned long totalram; /* Total usable main memory size */
252 unsigned long freeram; /* Available memory size */
253 unsigned long sharedram; /* Amount of shared memory */
254 unsigned long bufferram; /* Memory used by buffers */
255 unsigned long totalswap; /* Total swap space size */
256 unsigned long freeswap; /* swap space still available */
257 unsigned short procs; /* Number of current processes */
258 unsigned short pad; /* explicit padding for m68k */
259 unsigned long totalhigh; /* Total high memory size */
260 unsigned long freehigh; /* Available high memory size */
261 unsigned int mem_unit; /* Memory unit size in bytes */
262 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
265 extern void BUILD_BUG(void);
266 #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
268 /* Trap pasters of __FUNCTION__ at compile-time */
269 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
270 #define __FUNCTION__ (__func__)