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); 117 118 #ifdef CONFIG_PRINTK 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))); 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 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 317