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 <linux/log2.h> 17 #include <asm/byteorder.h> 18 #include <asm/bug.h> 19 20 extern const char linux_banner[]; 21 22 #define INT_MAX ((int)(~0U>>1)) 23 #define INT_MIN (-INT_MAX - 1) 24 #define UINT_MAX (~0U) 25 #define LONG_MAX ((long)(~0UL>>1)) 26 #define LONG_MIN (-LONG_MAX - 1) 27 #define ULONG_MAX (~0UL) 28 #define LLONG_MAX ((long long)(~0ULL>>1)) 29 #define LLONG_MIN (-LLONG_MAX - 1) 30 #define ULLONG_MAX (~0ULL) 31 32 #define STACK_MAGIC 0xdeadbeef 33 34 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) 35 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) 36 37 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 38 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 39 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 40 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 41 42 #define KERN_EMERG "<0>" /* system is unusable */ 43 #define KERN_ALERT "<1>" /* action must be taken immediately */ 44 #define KERN_CRIT "<2>" /* critical conditions */ 45 #define KERN_ERR "<3>" /* error conditions */ 46 #define KERN_WARNING "<4>" /* warning conditions */ 47 #define KERN_NOTICE "<5>" /* normal but significant condition */ 48 #define KERN_INFO "<6>" /* informational */ 49 #define KERN_DEBUG "<7>" /* debug-level messages */ 50 51 extern int console_printk[]; 52 53 #define console_loglevel (console_printk[0]) 54 #define default_message_loglevel (console_printk[1]) 55 #define minimum_console_loglevel (console_printk[2]) 56 #define default_console_loglevel (console_printk[3]) 57 58 struct completion; 59 struct pt_regs; 60 struct user; 61 62 /** 63 * might_sleep - annotation for functions that can sleep 64 * 65 * this macro will print a stack trace if it is executed in an atomic 66 * context (spinlock, irq-handler, ...). 67 * 68 * This is a useful debugging help to be able to catch problems early and not 69 * be bitten later when the calling function happens to sleep when it is not 70 * supposed to. 71 */ 72 #ifdef CONFIG_PREEMPT_VOLUNTARY 73 extern int cond_resched(void); 74 # define might_resched() cond_resched() 75 #else 76 # define might_resched() do { } while (0) 77 #endif 78 79 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 80 void __might_sleep(char *file, int line); 81 # define might_sleep() \ 82 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) 83 #else 84 # define might_sleep() do { might_resched(); } while (0) 85 #endif 86 87 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 88 89 #define abs(x) ({ \ 90 int __x = (x); \ 91 (__x < 0) ? -__x : __x; \ 92 }) 93 94 #define labs(x) ({ \ 95 long __x = (x); \ 96 (__x < 0) ? -__x : __x; \ 97 }) 98 99 extern struct atomic_notifier_head panic_notifier_list; 100 extern long (*panic_blink)(long time); 101 NORET_TYPE void panic(const char * fmt, ...) 102 __attribute__ ((NORET_AND format (printf, 1, 2))); 103 extern void oops_enter(void); 104 extern void oops_exit(void); 105 extern int oops_may_print(void); 106 fastcall NORET_TYPE void do_exit(long error_code) 107 ATTRIB_NORET; 108 NORET_TYPE void complete_and_exit(struct completion *, long) 109 ATTRIB_NORET; 110 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 111 extern long simple_strtol(const char *,char **,unsigned int); 112 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 113 extern long long simple_strtoll(const char *,char **,unsigned int); 114 extern int sprintf(char * buf, const char * fmt, ...) 115 __attribute__ ((format (printf, 2, 3))); 116 extern int vsprintf(char *buf, const char *, va_list) 117 __attribute__ ((format (printf, 2, 0))); 118 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 119 __attribute__ ((format (printf, 3, 4))); 120 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 121 __attribute__ ((format (printf, 3, 0))); 122 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 123 __attribute__ ((format (printf, 3, 4))); 124 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 125 __attribute__ ((format (printf, 3, 0))); 126 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 127 __attribute__ ((format (printf, 2, 3))); 128 129 extern int sscanf(const char *, const char *, ...) 130 __attribute__ ((format (scanf, 2, 3))); 131 extern int vsscanf(const char *, const char *, va_list) 132 __attribute__ ((format (scanf, 2, 0))); 133 134 extern int get_option(char **str, int *pint); 135 extern char *get_options(const char *str, int nints, int *ints); 136 extern unsigned long long memparse(char *ptr, char **retptr); 137 138 extern int core_kernel_text(unsigned long addr); 139 extern int __kernel_text_address(unsigned long addr); 140 extern int kernel_text_address(unsigned long addr); 141 extern int session_of_pgrp(int pgrp); 142 143 extern void dump_thread(struct pt_regs *regs, struct user *dump); 144 145 #ifdef CONFIG_PRINTK 146 asmlinkage int vprintk(const char *fmt, va_list args) 147 __attribute__ ((format (printf, 1, 0))); 148 asmlinkage int printk(const char * fmt, ...) 149 __attribute__ ((format (printf, 1, 2))); 150 #else 151 static inline int vprintk(const char *s, va_list args) 152 __attribute__ ((format (printf, 1, 0))); 153 static inline int vprintk(const char *s, va_list args) { return 0; } 154 static inline int printk(const char *s, ...) 155 __attribute__ ((format (printf, 1, 2))); 156 static inline int printk(const char *s, ...) { return 0; } 157 #endif 158 159 unsigned long int_sqrt(unsigned long); 160 161 extern int printk_ratelimit(void); 162 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); 163 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 164 unsigned int interval_msec); 165 166 static inline void console_silent(void) 167 { 168 console_loglevel = 0; 169 } 170 171 static inline void console_verbose(void) 172 { 173 if (console_loglevel) 174 console_loglevel = 15; 175 } 176 177 extern void bust_spinlocks(int yes); 178 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 179 extern int panic_timeout; 180 extern int panic_on_oops; 181 extern int panic_on_unrecovered_nmi; 182 extern int tainted; 183 extern const char *print_tainted(void); 184 extern void add_taint(unsigned); 185 186 /* Values used for system_state */ 187 extern enum system_states { 188 SYSTEM_BOOTING, 189 SYSTEM_RUNNING, 190 SYSTEM_HALT, 191 SYSTEM_POWER_OFF, 192 SYSTEM_RESTART, 193 SYSTEM_SUSPEND_DISK, 194 } system_state; 195 196 #define TAINT_PROPRIETARY_MODULE (1<<0) 197 #define TAINT_FORCED_MODULE (1<<1) 198 #define TAINT_UNSAFE_SMP (1<<2) 199 #define TAINT_FORCED_RMMOD (1<<3) 200 #define TAINT_MACHINE_CHECK (1<<4) 201 #define TAINT_BAD_PAGE (1<<5) 202 203 extern void dump_stack(void); 204 205 #ifdef DEBUG 206 /* If you are writing a driver, please use dev_dbg instead */ 207 #define pr_debug(fmt,arg...) \ 208 printk(KERN_DEBUG fmt,##arg) 209 #else 210 static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...) 211 { 212 return 0; 213 } 214 #endif 215 216 #define pr_info(fmt,arg...) \ 217 printk(KERN_INFO fmt,##arg) 218 219 /* 220 * Display an IP address in readable format. 221 */ 222 223 #define NIPQUAD(addr) \ 224 ((unsigned char *)&addr)[0], \ 225 ((unsigned char *)&addr)[1], \ 226 ((unsigned char *)&addr)[2], \ 227 ((unsigned char *)&addr)[3] 228 #define NIPQUAD_FMT "%u.%u.%u.%u" 229 230 #define NIP6(addr) \ 231 ntohs((addr).s6_addr16[0]), \ 232 ntohs((addr).s6_addr16[1]), \ 233 ntohs((addr).s6_addr16[2]), \ 234 ntohs((addr).s6_addr16[3]), \ 235 ntohs((addr).s6_addr16[4]), \ 236 ntohs((addr).s6_addr16[5]), \ 237 ntohs((addr).s6_addr16[6]), \ 238 ntohs((addr).s6_addr16[7]) 239 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" 240 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x" 241 242 #if defined(__LITTLE_ENDIAN) 243 #define HIPQUAD(addr) \ 244 ((unsigned char *)&addr)[3], \ 245 ((unsigned char *)&addr)[2], \ 246 ((unsigned char *)&addr)[1], \ 247 ((unsigned char *)&addr)[0] 248 #elif defined(__BIG_ENDIAN) 249 #define HIPQUAD NIPQUAD 250 #else 251 #error "Please fix asm/byteorder.h" 252 #endif /* __LITTLE_ENDIAN */ 253 254 /* 255 * min()/max() macros that also do 256 * strict type-checking.. See the 257 * "unnecessary" pointer comparison. 258 */ 259 #define min(x,y) ({ \ 260 typeof(x) _x = (x); \ 261 typeof(y) _y = (y); \ 262 (void) (&_x == &_y); \ 263 _x < _y ? _x : _y; }) 264 265 #define max(x,y) ({ \ 266 typeof(x) _x = (x); \ 267 typeof(y) _y = (y); \ 268 (void) (&_x == &_y); \ 269 _x > _y ? _x : _y; }) 270 271 /* 272 * ..and if you can't take the strict 273 * types, you can specify one yourself. 274 * 275 * Or not use min/max at all, of course. 276 */ 277 #define min_t(type,x,y) \ 278 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) 279 #define max_t(type,x,y) \ 280 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) 281 282 283 /** 284 * container_of - cast a member of a structure out to the containing structure 285 * @ptr: the pointer to the member. 286 * @type: the type of the container struct this is embedded in. 287 * @member: the name of the member within the struct. 288 * 289 */ 290 #define container_of(ptr, type, member) ({ \ 291 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 292 (type *)( (char *)__mptr - offsetof(type,member) );}) 293 294 /* 295 * Check at compile time that something is of a particular type. 296 * Always evaluates to 1 so you may use it easily in comparisons. 297 */ 298 #define typecheck(type,x) \ 299 ({ type __dummy; \ 300 typeof(x) __dummy2; \ 301 (void)(&__dummy == &__dummy2); \ 302 1; \ 303 }) 304 305 /* 306 * Check at compile time that 'function' is a certain type, or is a pointer 307 * to that type (needs to use typedef for the function type.) 308 */ 309 #define typecheck_fn(type,function) \ 310 ({ typeof(type) __tmp = function; \ 311 (void)__tmp; \ 312 }) 313 314 #endif /* __KERNEL__ */ 315 316 #define SI_LOAD_SHIFT 16 317 struct sysinfo { 318 long uptime; /* Seconds since boot */ 319 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 320 unsigned long totalram; /* Total usable main memory size */ 321 unsigned long freeram; /* Available memory size */ 322 unsigned long sharedram; /* Amount of shared memory */ 323 unsigned long bufferram; /* Memory used by buffers */ 324 unsigned long totalswap; /* Total swap space size */ 325 unsigned long freeswap; /* swap space still available */ 326 unsigned short procs; /* Number of current processes */ 327 unsigned short pad; /* explicit padding for m68k */ 328 unsigned long totalhigh; /* Total high memory size */ 329 unsigned long freehigh; /* Available high memory size */ 330 unsigned int mem_unit; /* Memory unit size in bytes */ 331 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 332 }; 333 334 /* Force a compilation error if condition is true */ 335 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 336 337 /* Force a compilation error if condition is true, but also produce a 338 result (of value 0 and type size_t), so the expression can be used 339 e.g. in a structure initializer (or where-ever else comma expressions 340 aren't permitted). */ 341 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) 342 343 /* Trap pasters of __FUNCTION__ at compile-time */ 344 #define __FUNCTION__ (__func__) 345 346 /* This helps us to avoid #ifdef CONFIG_NUMA */ 347 #ifdef CONFIG_NUMA 348 #define NUMA_BUILD 1 349 #else 350 #define NUMA_BUILD 0 351 #endif 352 353 #endif 354