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 #define LLONG_MAX ((long long)(~0ULL>>1)) 28 #define LLONG_MIN (-LLONG_MAX - 1) 29 #define ULLONG_MAX (~0ULL) 30 31 #define STACK_MAGIC 0xdeadbeef 32 33 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 34 #define ALIGN(x,a) (((x)+(a)-1)&~((a)-1)) 35 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 36 37 #define KERN_EMERG "<0>" /* system is unusable */ 38 #define KERN_ALERT "<1>" /* action must be taken immediately */ 39 #define KERN_CRIT "<2>" /* critical conditions */ 40 #define KERN_ERR "<3>" /* error conditions */ 41 #define KERN_WARNING "<4>" /* warning conditions */ 42 #define KERN_NOTICE "<5>" /* normal but significant condition */ 43 #define KERN_INFO "<6>" /* informational */ 44 #define KERN_DEBUG "<7>" /* debug-level messages */ 45 46 extern int console_printk[]; 47 48 #define console_loglevel (console_printk[0]) 49 #define default_message_loglevel (console_printk[1]) 50 #define minimum_console_loglevel (console_printk[2]) 51 #define default_console_loglevel (console_printk[3]) 52 53 struct completion; 54 struct pt_regs; 55 struct user; 56 57 /** 58 * might_sleep - annotation for functions that can sleep 59 * 60 * this macro will print a stack trace if it is executed in an atomic 61 * context (spinlock, irq-handler, ...). 62 * 63 * This is a useful debugging help to be able to catch problems early and not 64 * be biten later when the calling function happens to sleep when it is not 65 * supposed to. 66 */ 67 #ifdef CONFIG_PREEMPT_VOLUNTARY 68 extern int cond_resched(void); 69 # define might_resched() cond_resched() 70 #else 71 # define might_resched() do { } while (0) 72 #endif 73 74 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 75 void __might_sleep(char *file, int line); 76 # define might_sleep() \ 77 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) 78 #else 79 # define might_sleep() do { might_resched(); } while (0) 80 #endif 81 82 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 83 84 #define abs(x) ({ \ 85 int __x = (x); \ 86 (__x < 0) ? -__x : __x; \ 87 }) 88 89 #define labs(x) ({ \ 90 long __x = (x); \ 91 (__x < 0) ? -__x : __x; \ 92 }) 93 94 extern struct atomic_notifier_head panic_notifier_list; 95 extern long (*panic_blink)(long time); 96 NORET_TYPE void panic(const char * fmt, ...) 97 __attribute__ ((NORET_AND format (printf, 1, 2))); 98 extern void oops_enter(void); 99 extern void oops_exit(void); 100 extern int oops_may_print(void); 101 fastcall NORET_TYPE void do_exit(long error_code) 102 ATTRIB_NORET; 103 NORET_TYPE void complete_and_exit(struct completion *, long) 104 ATTRIB_NORET; 105 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 106 extern long simple_strtol(const char *,char **,unsigned int); 107 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 108 extern long long simple_strtoll(const char *,char **,unsigned int); 109 extern int sprintf(char * buf, const char * fmt, ...) 110 __attribute__ ((format (printf, 2, 3))); 111 extern int vsprintf(char *buf, const char *, va_list) 112 __attribute__ ((format (printf, 2, 0))); 113 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 114 __attribute__ ((format (printf, 3, 4))); 115 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 116 __attribute__ ((format (printf, 3, 0))); 117 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 118 __attribute__ ((format (printf, 3, 4))); 119 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 120 __attribute__ ((format (printf, 3, 0))); 121 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 122 __attribute__ ((format (printf, 2, 3))); 123 124 extern int sscanf(const char *, const char *, ...) 125 __attribute__ ((format (scanf, 2, 3))); 126 extern int vsscanf(const char *, const char *, va_list) 127 __attribute__ ((format (scanf, 2, 0))); 128 129 extern int get_option(char **str, int *pint); 130 extern char *get_options(const char *str, int nints, int *ints); 131 extern unsigned long long memparse(char *ptr, char **retptr); 132 133 extern int core_kernel_text(unsigned long addr); 134 extern int __kernel_text_address(unsigned long addr); 135 extern int kernel_text_address(unsigned long addr); 136 extern int session_of_pgrp(int pgrp); 137 138 extern void dump_thread(struct pt_regs *regs, struct user *dump); 139 140 #ifdef CONFIG_PRINTK 141 asmlinkage int vprintk(const char *fmt, va_list args) 142 __attribute__ ((format (printf, 1, 0))); 143 asmlinkage int printk(const char * fmt, ...) 144 __attribute__ ((format (printf, 1, 2))); 145 #else 146 static inline int vprintk(const char *s, va_list args) 147 __attribute__ ((format (printf, 1, 0))); 148 static inline int vprintk(const char *s, va_list args) { return 0; } 149 static inline int printk(const char *s, ...) 150 __attribute__ ((format (printf, 1, 2))); 151 static inline int printk(const char *s, ...) { return 0; } 152 #endif 153 154 unsigned long int_sqrt(unsigned long); 155 156 static inline int __attribute_pure__ long_log2(unsigned long x) 157 { 158 int r = 0; 159 for (x >>= 1; x > 0; x >>= 1) 160 r++; 161 return r; 162 } 163 164 static inline unsigned long 165 __attribute_const__ roundup_pow_of_two(unsigned long x) 166 { 167 return 1UL << fls_long(x - 1); 168 } 169 170 extern int printk_ratelimit(void); 171 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); 172 173 static inline void console_silent(void) 174 { 175 console_loglevel = 0; 176 } 177 178 static inline void console_verbose(void) 179 { 180 if (console_loglevel) 181 console_loglevel = 15; 182 } 183 184 extern void bust_spinlocks(int yes); 185 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 186 extern int panic_timeout; 187 extern int panic_on_oops; 188 extern int tainted; 189 extern const char *print_tainted(void); 190 extern void add_taint(unsigned); 191 192 /* Values used for system_state */ 193 extern enum system_states { 194 SYSTEM_BOOTING, 195 SYSTEM_RUNNING, 196 SYSTEM_HALT, 197 SYSTEM_POWER_OFF, 198 SYSTEM_RESTART, 199 SYSTEM_SUSPEND_DISK, 200 } system_state; 201 202 #define TAINT_PROPRIETARY_MODULE (1<<0) 203 #define TAINT_FORCED_MODULE (1<<1) 204 #define TAINT_UNSAFE_SMP (1<<2) 205 #define TAINT_FORCED_RMMOD (1<<3) 206 #define TAINT_MACHINE_CHECK (1<<4) 207 #define TAINT_BAD_PAGE (1<<5) 208 209 extern void dump_stack(void); 210 211 #ifdef DEBUG 212 #define pr_debug(fmt,arg...) \ 213 printk(KERN_DEBUG fmt,##arg) 214 #else 215 #define pr_debug(fmt,arg...) \ 216 do { } while (0) 217 #endif 218 219 #define pr_info(fmt,arg...) \ 220 printk(KERN_INFO fmt,##arg) 221 222 /* 223 * Display an IP address in readable format. 224 */ 225 226 #define NIPQUAD(addr) \ 227 ((unsigned char *)&addr)[0], \ 228 ((unsigned char *)&addr)[1], \ 229 ((unsigned char *)&addr)[2], \ 230 ((unsigned char *)&addr)[3] 231 #define NIPQUAD_FMT "%u.%u.%u.%u" 232 233 #define NIP6(addr) \ 234 ntohs((addr).s6_addr16[0]), \ 235 ntohs((addr).s6_addr16[1]), \ 236 ntohs((addr).s6_addr16[2]), \ 237 ntohs((addr).s6_addr16[3]), \ 238 ntohs((addr).s6_addr16[4]), \ 239 ntohs((addr).s6_addr16[5]), \ 240 ntohs((addr).s6_addr16[6]), \ 241 ntohs((addr).s6_addr16[7]) 242 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" 243 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x" 244 245 #if defined(__LITTLE_ENDIAN) 246 #define HIPQUAD(addr) \ 247 ((unsigned char *)&addr)[3], \ 248 ((unsigned char *)&addr)[2], \ 249 ((unsigned char *)&addr)[1], \ 250 ((unsigned char *)&addr)[0] 251 #elif defined(__BIG_ENDIAN) 252 #define HIPQUAD NIPQUAD 253 #else 254 #error "Please fix asm/byteorder.h" 255 #endif /* __LITTLE_ENDIAN */ 256 257 /* 258 * min()/max() macros that also do 259 * strict type-checking.. See the 260 * "unnecessary" pointer comparison. 261 */ 262 #define min(x,y) ({ \ 263 typeof(x) _x = (x); \ 264 typeof(y) _y = (y); \ 265 (void) (&_x == &_y); \ 266 _x < _y ? _x : _y; }) 267 268 #define max(x,y) ({ \ 269 typeof(x) _x = (x); \ 270 typeof(y) _y = (y); \ 271 (void) (&_x == &_y); \ 272 _x > _y ? _x : _y; }) 273 274 /* 275 * ..and if you can't take the strict 276 * types, you can specify one yourself. 277 * 278 * Or not use min/max at all, of course. 279 */ 280 #define min_t(type,x,y) \ 281 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) 282 #define max_t(type,x,y) \ 283 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) 284 285 286 /** 287 * container_of - cast a member of a structure out to the containing structure 288 * @ptr: the pointer to the member. 289 * @type: the type of the container struct this is embedded in. 290 * @member: the name of the member within the struct. 291 * 292 */ 293 #define container_of(ptr, type, member) ({ \ 294 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 295 (type *)( (char *)__mptr - offsetof(type,member) );}) 296 297 /* 298 * Check at compile time that something is of a particular type. 299 * Always evaluates to 1 so you may use it easily in comparisons. 300 */ 301 #define typecheck(type,x) \ 302 ({ type __dummy; \ 303 typeof(x) __dummy2; \ 304 (void)(&__dummy == &__dummy2); \ 305 1; \ 306 }) 307 308 /* 309 * Check at compile time that 'function' is a certain type, or is a pointer 310 * to that type (needs to use typedef for the function type.) 311 */ 312 #define typecheck_fn(type,function) \ 313 ({ typeof(type) __tmp = function; \ 314 (void)__tmp; \ 315 }) 316 317 #endif /* __KERNEL__ */ 318 319 #define SI_LOAD_SHIFT 16 320 struct sysinfo { 321 long uptime; /* Seconds since boot */ 322 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 323 unsigned long totalram; /* Total usable main memory size */ 324 unsigned long freeram; /* Available memory size */ 325 unsigned long sharedram; /* Amount of shared memory */ 326 unsigned long bufferram; /* Memory used by buffers */ 327 unsigned long totalswap; /* Total swap space size */ 328 unsigned long freeswap; /* swap space still available */ 329 unsigned short procs; /* Number of current processes */ 330 unsigned short pad; /* explicit padding for m68k */ 331 unsigned long totalhigh; /* Total high memory size */ 332 unsigned long freehigh; /* Available high memory size */ 333 unsigned int mem_unit; /* Memory unit size in bytes */ 334 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 335 }; 336 337 /* Force a compilation error if condition is true */ 338 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 339 340 /* Force a compilation error if condition is true, but also produce a 341 result (of value 0 and type size_t), so the expression can be used 342 e.g. in a structure initializer (or where-ever else comma expressions 343 aren't permitted). */ 344 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) 345 346 /* Trap pasters of __FUNCTION__ at compile-time */ 347 #define __FUNCTION__ (__func__) 348 349 #endif 350