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 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 37 38 #define KERN_EMERG "<0>" /* system is unusable */ 39 #define KERN_ALERT "<1>" /* action must be taken immediately */ 40 #define KERN_CRIT "<2>" /* critical conditions */ 41 #define KERN_ERR "<3>" /* error conditions */ 42 #define KERN_WARNING "<4>" /* warning conditions */ 43 #define KERN_NOTICE "<5>" /* normal but significant condition */ 44 #define KERN_INFO "<6>" /* informational */ 45 #define KERN_DEBUG "<7>" /* debug-level messages */ 46 47 extern int console_printk[]; 48 49 #define console_loglevel (console_printk[0]) 50 #define default_message_loglevel (console_printk[1]) 51 #define minimum_console_loglevel (console_printk[2]) 52 #define default_console_loglevel (console_printk[3]) 53 54 struct completion; 55 struct pt_regs; 56 struct user; 57 58 /** 59 * might_sleep - annotation for functions that can sleep 60 * 61 * this macro will print a stack trace if it is executed in an atomic 62 * context (spinlock, irq-handler, ...). 63 * 64 * This is a useful debugging help to be able to catch problems early and not 65 * be biten later when the calling function happens to sleep when it is not 66 * supposed to. 67 */ 68 #ifdef CONFIG_PREEMPT_VOLUNTARY 69 extern int cond_resched(void); 70 # define might_resched() cond_resched() 71 #else 72 # define might_resched() do { } while (0) 73 #endif 74 75 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 76 void __might_sleep(char *file, int line); 77 # define might_sleep() \ 78 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) 79 #else 80 # define might_sleep() do { might_resched(); } while (0) 81 #endif 82 83 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 84 85 #define abs(x) ({ \ 86 int __x = (x); \ 87 (__x < 0) ? -__x : __x; \ 88 }) 89 90 #define labs(x) ({ \ 91 long __x = (x); \ 92 (__x < 0) ? -__x : __x; \ 93 }) 94 95 extern struct atomic_notifier_head panic_notifier_list; 96 extern long (*panic_blink)(long time); 97 NORET_TYPE void panic(const char * fmt, ...) 98 __attribute__ ((NORET_AND format (printf, 1, 2))); 99 extern void oops_enter(void); 100 extern void oops_exit(void); 101 extern int oops_may_print(void); 102 fastcall NORET_TYPE void do_exit(long error_code) 103 ATTRIB_NORET; 104 NORET_TYPE void complete_and_exit(struct completion *, long) 105 ATTRIB_NORET; 106 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 107 extern long simple_strtol(const char *,char **,unsigned int); 108 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 109 extern long long simple_strtoll(const char *,char **,unsigned int); 110 extern int sprintf(char * buf, const char * fmt, ...) 111 __attribute__ ((format (printf, 2, 3))); 112 extern int vsprintf(char *buf, const char *, va_list) 113 __attribute__ ((format (printf, 2, 0))); 114 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 115 __attribute__ ((format (printf, 3, 4))); 116 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 117 __attribute__ ((format (printf, 3, 0))); 118 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 119 __attribute__ ((format (printf, 3, 4))); 120 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 121 __attribute__ ((format (printf, 3, 0))); 122 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 123 __attribute__ ((format (printf, 2, 3))); 124 125 extern int sscanf(const char *, const char *, ...) 126 __attribute__ ((format (scanf, 2, 3))); 127 extern int vsscanf(const char *, const char *, va_list) 128 __attribute__ ((format (scanf, 2, 0))); 129 130 extern int get_option(char **str, int *pint); 131 extern char *get_options(const char *str, int nints, int *ints); 132 extern unsigned long long memparse(char *ptr, char **retptr); 133 134 extern int core_kernel_text(unsigned long addr); 135 extern int __kernel_text_address(unsigned long addr); 136 extern int kernel_text_address(unsigned long addr); 137 extern int session_of_pgrp(int pgrp); 138 139 extern void dump_thread(struct pt_regs *regs, struct user *dump); 140 141 #ifdef CONFIG_PRINTK 142 asmlinkage int vprintk(const char *fmt, va_list args) 143 __attribute__ ((format (printf, 1, 0))); 144 asmlinkage int printk(const char * fmt, ...) 145 __attribute__ ((format (printf, 1, 2))); 146 #else 147 static inline int vprintk(const char *s, va_list args) 148 __attribute__ ((format (printf, 1, 0))); 149 static inline int vprintk(const char *s, va_list args) { return 0; } 150 static inline int printk(const char *s, ...) 151 __attribute__ ((format (printf, 1, 2))); 152 static inline int printk(const char *s, ...) { return 0; } 153 #endif 154 155 unsigned long int_sqrt(unsigned long); 156 157 static inline int __attribute_pure__ long_log2(unsigned long x) 158 { 159 int r = 0; 160 for (x >>= 1; x > 0; x >>= 1) 161 r++; 162 return r; 163 } 164 165 static inline unsigned long 166 __attribute_const__ roundup_pow_of_two(unsigned long x) 167 { 168 return 1UL << fls_long(x - 1); 169 } 170 171 extern int printk_ratelimit(void); 172 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); 173 174 static inline void console_silent(void) 175 { 176 console_loglevel = 0; 177 } 178 179 static inline void console_verbose(void) 180 { 181 if (console_loglevel) 182 console_loglevel = 15; 183 } 184 185 extern void bust_spinlocks(int yes); 186 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 187 extern int panic_timeout; 188 extern int panic_on_oops; 189 extern int tainted; 190 extern const char *print_tainted(void); 191 extern void add_taint(unsigned); 192 193 /* Values used for system_state */ 194 extern enum system_states { 195 SYSTEM_BOOTING, 196 SYSTEM_RUNNING, 197 SYSTEM_HALT, 198 SYSTEM_POWER_OFF, 199 SYSTEM_RESTART, 200 SYSTEM_SUSPEND_DISK, 201 } system_state; 202 203 #define TAINT_PROPRIETARY_MODULE (1<<0) 204 #define TAINT_FORCED_MODULE (1<<1) 205 #define TAINT_UNSAFE_SMP (1<<2) 206 #define TAINT_FORCED_RMMOD (1<<3) 207 #define TAINT_MACHINE_CHECK (1<<4) 208 #define TAINT_BAD_PAGE (1<<5) 209 210 extern void dump_stack(void); 211 212 #ifdef DEBUG 213 /* If you are writing a driver, please use dev_dbg instead */ 214 #define pr_debug(fmt,arg...) \ 215 printk(KERN_DEBUG fmt,##arg) 216 #else 217 #define pr_debug(fmt,arg...) \ 218 do { } while (0) 219 #endif 220 221 #define pr_info(fmt,arg...) \ 222 printk(KERN_INFO fmt,##arg) 223 224 /* 225 * Display an IP address in readable format. 226 */ 227 228 #define NIPQUAD(addr) \ 229 ((unsigned char *)&addr)[0], \ 230 ((unsigned char *)&addr)[1], \ 231 ((unsigned char *)&addr)[2], \ 232 ((unsigned char *)&addr)[3] 233 #define NIPQUAD_FMT "%u.%u.%u.%u" 234 235 #define NIP6(addr) \ 236 ntohs((addr).s6_addr16[0]), \ 237 ntohs((addr).s6_addr16[1]), \ 238 ntohs((addr).s6_addr16[2]), \ 239 ntohs((addr).s6_addr16[3]), \ 240 ntohs((addr).s6_addr16[4]), \ 241 ntohs((addr).s6_addr16[5]), \ 242 ntohs((addr).s6_addr16[6]), \ 243 ntohs((addr).s6_addr16[7]) 244 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" 245 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x" 246 247 #if defined(__LITTLE_ENDIAN) 248 #define HIPQUAD(addr) \ 249 ((unsigned char *)&addr)[3], \ 250 ((unsigned char *)&addr)[2], \ 251 ((unsigned char *)&addr)[1], \ 252 ((unsigned char *)&addr)[0] 253 #elif defined(__BIG_ENDIAN) 254 #define HIPQUAD NIPQUAD 255 #else 256 #error "Please fix asm/byteorder.h" 257 #endif /* __LITTLE_ENDIAN */ 258 259 /* 260 * min()/max() macros that also do 261 * strict type-checking.. See the 262 * "unnecessary" pointer comparison. 263 */ 264 #define min(x,y) ({ \ 265 typeof(x) _x = (x); \ 266 typeof(y) _y = (y); \ 267 (void) (&_x == &_y); \ 268 _x < _y ? _x : _y; }) 269 270 #define max(x,y) ({ \ 271 typeof(x) _x = (x); \ 272 typeof(y) _y = (y); \ 273 (void) (&_x == &_y); \ 274 _x > _y ? _x : _y; }) 275 276 /* 277 * ..and if you can't take the strict 278 * types, you can specify one yourself. 279 * 280 * Or not use min/max at all, of course. 281 */ 282 #define min_t(type,x,y) \ 283 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) 284 #define max_t(type,x,y) \ 285 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) 286 287 288 /** 289 * container_of - cast a member of a structure out to the containing structure 290 * @ptr: the pointer to the member. 291 * @type: the type of the container struct this is embedded in. 292 * @member: the name of the member within the struct. 293 * 294 */ 295 #define container_of(ptr, type, member) ({ \ 296 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 297 (type *)( (char *)__mptr - offsetof(type,member) );}) 298 299 /* 300 * Check at compile time that something is of a particular type. 301 * Always evaluates to 1 so you may use it easily in comparisons. 302 */ 303 #define typecheck(type,x) \ 304 ({ type __dummy; \ 305 typeof(x) __dummy2; \ 306 (void)(&__dummy == &__dummy2); \ 307 1; \ 308 }) 309 310 /* 311 * Check at compile time that 'function' is a certain type, or is a pointer 312 * to that type (needs to use typedef for the function type.) 313 */ 314 #define typecheck_fn(type,function) \ 315 ({ typeof(type) __tmp = function; \ 316 (void)__tmp; \ 317 }) 318 319 #endif /* __KERNEL__ */ 320 321 #define SI_LOAD_SHIFT 16 322 struct sysinfo { 323 long uptime; /* Seconds since boot */ 324 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 325 unsigned long totalram; /* Total usable main memory size */ 326 unsigned long freeram; /* Available memory size */ 327 unsigned long sharedram; /* Amount of shared memory */ 328 unsigned long bufferram; /* Memory used by buffers */ 329 unsigned long totalswap; /* Total swap space size */ 330 unsigned long freeswap; /* swap space still available */ 331 unsigned short procs; /* Number of current processes */ 332 unsigned short pad; /* explicit padding for m68k */ 333 unsigned long totalhigh; /* Total high memory size */ 334 unsigned long freehigh; /* Available high memory size */ 335 unsigned int mem_unit; /* Memory unit size in bytes */ 336 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 337 }; 338 339 /* Force a compilation error if condition is true */ 340 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 341 342 /* Force a compilation error if condition is true, but also produce a 343 result (of value 0 and type size_t), so the expression can be used 344 e.g. in a structure initializer (or where-ever else comma expressions 345 aren't permitted). */ 346 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) 347 348 /* Trap pasters of __FUNCTION__ at compile-time */ 349 #define __FUNCTION__ (__func__) 350 351 #endif 352
