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_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 68 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 69 void __might_sleep(char *file, int line); 70 # define might_sleep() \ 71 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) 72 #else 73 # define might_sleep() do { might_resched(); } while (0) 74 #endif 75 76 #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0) 77 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); 125 126 #ifdef CONFIG_PRINTK 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))); 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 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 }; 309 310 /* Force a compilation error if condition is true */ 311 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 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 325