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)
57 extern struct notifier_block *panic_notifier_list;
58 NORET_TYPE void panic(const char * fmt, ...)
59 __attribute__ ((NORET_AND format (printf, 1, 2)));
60 asmlinkage NORET_TYPE void do_exit(long error_code)
62 NORET_TYPE void complete_and_exit(struct completion *, long)
65 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
66 extern long simple_strtol(const char *,char **,unsigned int);
67 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
68 extern long long simple_strtoll(const char *,char **,unsigned int);
69 extern int sprintf(char * buf, const char * fmt, ...)
70 __attribute__ ((format (printf, 2, 3)));
71 extern int vsprintf(char *buf, const char *, va_list);
72 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
73 __attribute__ ((format (printf, 3, 4)));
74 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);
75 extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
76 __attribute__ ((format (printf, 3, 4)));
77 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
79 extern int sscanf(const char *, const char *, ...)
80 __attribute__ ((format (scanf,2,3)));
81 extern int vsscanf(const char *, const char *, va_list);
83 extern int get_option(char **str, int *pint);
84 extern char *get_options(const char *str, int nints, int *ints);
85 extern unsigned long long memparse(char *ptr, char **retptr);
87 extern int kernel_text_address(unsigned long addr);
88 extern int session_of_pgrp(int pgrp);
90 asmlinkage int printk(const char * fmt, ...)
91 __attribute__ ((format (printf, 1, 2)));
93 unsigned long int_sqrt(unsigned long);
95 extern int printk_ratelimit(void);
96 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst);
98 static inline void console_silent(void)
100 console_loglevel = 0;
103 static inline void console_verbose(void)
105 if (console_loglevel)
106 console_loglevel = 15;
109 extern void bust_spinlocks(int yes);
110 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
111 extern int panic_on_oops;
113 extern const char *print_tainted(void);
115 /* Values used for system_state */
116 extern enum system_states {
124 #define TAINT_PROPRIETARY_MODULE (1<<0)
125 #define TAINT_FORCED_MODULE (1<<1)
126 #define TAINT_UNSAFE_SMP (1<<2)
127 #define TAINT_FORCED_RMMOD (1<<3)
129 extern void dump_stack(void);
132 #define pr_debug(fmt,arg...) \
133 printk(KERN_DEBUG fmt,##arg)
135 #define pr_debug(fmt,arg...) \
139 #define pr_info(fmt,arg...) \
140 printk(KERN_INFO fmt,##arg)
143 * Display an IP address in readable format.
146 #define NIPQUAD(addr) \
147 ((unsigned char *)&addr)[0], \
148 ((unsigned char *)&addr)[1], \
149 ((unsigned char *)&addr)[2], \
150 ((unsigned char *)&addr)[3]
153 ntohs((addr).s6_addr16[0]), \
154 ntohs((addr).s6_addr16[1]), \
155 ntohs((addr).s6_addr16[2]), \
156 ntohs((addr).s6_addr16[3]), \
157 ntohs((addr).s6_addr16[4]), \
158 ntohs((addr).s6_addr16[5]), \
159 ntohs((addr).s6_addr16[6]), \
160 ntohs((addr).s6_addr16[7])
162 #if defined(__LITTLE_ENDIAN)
163 #define HIPQUAD(addr) \
164 ((unsigned char *)&addr)[3], \
165 ((unsigned char *)&addr)[2], \
166 ((unsigned char *)&addr)[1], \
167 ((unsigned char *)&addr)[0]
168 #elif defined(__BIG_ENDIAN)
169 #define HIPQUAD NIPQUAD
171 #error "Please fix asm/byteorder.h"
172 #endif /* __LITTLE_ENDIAN */
175 * min()/max() macros that also do
176 * strict type-checking.. See the
177 * "unnecessary" pointer comparison.
179 #define min(x,y) ({ \
180 typeof(x) _x = (x); \
181 typeof(y) _y = (y); \
182 (void) (&_x == &_y); \
183 _x < _y ? _x : _y; })
185 #define max(x,y) ({ \
186 typeof(x) _x = (x); \
187 typeof(y) _y = (y); \
188 (void) (&_x == &_y); \
189 _x > _y ? _x : _y; })
192 * ..and if you can't take the strict
193 * types, you can specify one yourself.
195 * Or not use min/max at all, of course.
197 #define min_t(type,x,y) \
198 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
199 #define max_t(type,x,y) \
200 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
204 * container_of - cast a member of a structure out to the containing structure
206 * @ptr: the pointer to the member.
207 * @type: the type of the container struct this is embedded in.
208 * @member: the name of the member within the struct.
211 #define container_of(ptr, type, member) ({ \
212 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
213 (type *)( (char *)__mptr - offsetof(type,member) );})
216 * Check at compile time that something is of a particular type.
217 * Always evaluates to 1 so you may use it easily in comparisons.
219 #define typecheck(type,x) \
221 typeof(x) __dummy2; \
222 (void)(&__dummy == &__dummy2); \
226 #endif /* __KERNEL__ */
228 #define SI_LOAD_SHIFT 16
230 long uptime; /* Seconds since boot */
231 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
232 unsigned long totalram; /* Total usable main memory size */
233 unsigned long freeram; /* Available memory size */
234 unsigned long sharedram; /* Amount of shared memory */
235 unsigned long bufferram; /* Memory used by buffers */
236 unsigned long totalswap; /* Total swap space size */
237 unsigned long freeswap; /* swap space still available */
238 unsigned short procs; /* Number of current processes */
239 unsigned short pad; /* explicit padding for m68k */
240 unsigned long totalhigh; /* Total high memory size */
241 unsigned long freehigh; /* Available high memory size */
242 unsigned int mem_unit; /* Memory unit size in bytes */
243 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
246 extern void BUILD_BUG(void);
247 #define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)
249 /* Trap pasters of __FUNCTION__ at compile-time */
250 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
251 #define __FUNCTION__ (__func__)