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>
17 /* Optimization barrier */
18 /* The "volatile" is due to gcc bugs */
19 #define barrier() __asm__ __volatile__("": : :"memory")
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)
28 #define STACK_MAGIC 0xdeadbeef
30 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
32 #define KERN_EMERG "<0>" /* system is unusable */
33 #define KERN_ALERT "<1>" /* action must be taken immediately */
34 #define KERN_CRIT "<2>" /* critical conditions */
35 #define KERN_ERR "<3>" /* error conditions */
36 #define KERN_WARNING "<4>" /* warning conditions */
37 #define KERN_NOTICE "<5>" /* normal but significant condition */
38 #define KERN_INFO "<6>" /* informational */
39 #define KERN_DEBUG "<7>" /* debug-level messages */
41 extern int console_printk[];
43 #define console_loglevel (console_printk[0])
44 #define default_message_loglevel (console_printk[1])
45 #define minimum_console_loglevel (console_printk[2])
46 #define default_console_loglevel (console_printk[3])
48 # define NORET_TYPE /**/
49 # define ATTRIB_NORET __attribute__((noreturn))
50 # define NORET_AND noreturn,
53 #define FASTCALL(x) x __attribute__((regparm(3)))
60 extern struct notifier_block *panic_notifier_list;
61 NORET_TYPE void panic(const char * fmt, ...)
62 __attribute__ ((NORET_AND format (printf, 1, 2)));
63 asmlinkage NORET_TYPE void do_exit(long error_code)
65 NORET_TYPE void complete_and_exit(struct completion *, long)
68 extern unsigned long simple_strtoul(const char *,char **,unsigned int);
69 extern long simple_strtol(const char *,char **,unsigned int);
70 extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
71 extern long long simple_strtoll(const char *,char **,unsigned int);
72 extern int sprintf(char * buf, const char * fmt, ...)
73 __attribute__ ((format (printf, 2, 3)));
74 extern int vsprintf(char *buf, const char *, va_list);
75 extern int snprintf(char * buf, size_t size, const char * fmt, ...)
76 __attribute__ ((format (printf, 3, 4)));
77 extern int vsnprintf(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(char *str, int nints, int *ints);
85 extern unsigned long long memparse(char *ptr, char **retptr);
86 extern void dev_probe_lock(void);
87 extern void dev_probe_unlock(void);
89 extern int session_of_pgrp(int pgrp);
91 asmlinkage int printk(const char * fmt, ...)
92 __attribute__ ((format (printf, 1, 2)));
94 static inline void console_silent(void)
99 static inline void console_verbose(void)
101 if (console_loglevel)
102 console_loglevel = 15;
105 extern void bust_spinlocks(int yes);
106 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
109 extern const char *print_tainted(void);
111 extern void dump_stack(void);
114 #define pr_debug(fmt,arg...) \
115 printk(KERN_DEBUG fmt,##arg)
117 #define pr_debug(fmt,arg...) \
121 #define pr_info(fmt,arg...) \
122 printk(KERN_INFO fmt,##arg)
125 * Display an IP address in readable format.
128 #define NIPQUAD(addr) \
129 ((unsigned char *)&addr)[0], \
130 ((unsigned char *)&addr)[1], \
131 ((unsigned char *)&addr)[2], \
132 ((unsigned char *)&addr)[3]
134 #if defined(__LITTLE_ENDIAN)
135 #define HIPQUAD(addr) \
136 ((unsigned char *)&addr)[3], \
137 ((unsigned char *)&addr)[2], \
138 ((unsigned char *)&addr)[1], \
139 ((unsigned char *)&addr)[0]
140 #elif defined(__BIG_ENDIAN)
141 #define HIPQUAD NIPQUAD
143 #error "Please fix asm/byteorder.h"
144 #endif /* __LITTLE_ENDIAN */
147 * min()/max() macros that also do
148 * strict type-checking.. See the
149 * "unnecessary" pointer comparison.
151 #define min(x,y) ({ \
152 const typeof(x) _x = (x); \
153 const typeof(y) _y = (y); \
154 (void) (&_x == &_y); \
155 _x < _y ? _x : _y; })
157 #define max(x,y) ({ \
158 const typeof(x) _x = (x); \
159 const typeof(y) _y = (y); \
160 (void) (&_x == &_y); \
161 _x > _y ? _x : _y; })
164 * ..and if you can't take the strict
165 * types, you can specify one yourself.
167 * Or not use min/max at all, of course.
169 #define min_t(type,x,y) \
170 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
171 #define max_t(type,x,y) \
172 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
174 extern void __out_of_line_bug(int line) ATTRIB_NORET;
175 #define out_of_line_bug() __out_of_line_bug(__LINE__)
177 #endif /* __KERNEL__ */
179 #define SI_LOAD_SHIFT 16
181 long uptime; /* Seconds since boot */
182 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
183 unsigned long totalram; /* Total usable main memory size */
184 unsigned long freeram; /* Available memory size */
185 unsigned long sharedram; /* Amount of shared memory */
186 unsigned long bufferram; /* Memory used by buffers */
187 unsigned long totalswap; /* Total swap space size */
188 unsigned long freeswap; /* swap space still available */
189 unsigned short procs; /* Number of current processes */
190 unsigned short pad; /* explicit padding for m68k */
191 unsigned long totalhigh; /* Total high memory size */
192 unsigned long freehigh; /* Available high memory size */
193 unsigned int mem_unit; /* Memory unit size in bytes */
194 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
197 #define BUG_ON(condition) do { if (unlikely((condition)!=0)) BUG(); } while(0)
199 #endif /* _LINUX_KERNEL_H */