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 extern const char linux_proc_banner[]; 22 23 #define INT_MAX ((int)(~0U>>1)) 24 #define INT_MIN (-INT_MAX - 1) 25 #define UINT_MAX (~0U) 26 #define LONG_MAX ((long)(~0UL>>1)) 27 #define LONG_MIN (-LONG_MAX - 1) 28 #define ULONG_MAX (~0UL) 29 #define LLONG_MAX ((long long)(~0ULL>>1)) 30 #define LLONG_MIN (-LLONG_MAX - 1) 31 #define ULLONG_MAX (~0ULL) 32 33 #define STACK_MAGIC 0xdeadbeef 34 35 #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) 36 #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) 37 38 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 39 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 40 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 41 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 42 43 #define KERN_EMERG "<0>" /* system is unusable */ 44 #define KERN_ALERT "<1>" /* action must be taken immediately */ 45 #define KERN_CRIT "<2>" /* critical conditions */ 46 #define KERN_ERR "<3>" /* error conditions */ 47 #define KERN_WARNING "<4>" /* warning conditions */ 48 #define KERN_NOTICE "<5>" /* normal but significant condition */ 49 #define KERN_INFO "<6>" /* informational */ 50 #define KERN_DEBUG "<7>" /* debug-level messages */ 51 52 extern int console_printk[]; 53 54 #define console_loglevel (console_printk[0]) 55 #define default_message_loglevel (console_printk[1]) 56 #define minimum_console_loglevel (console_printk[2]) 57 #define default_console_loglevel (console_printk[3]) 58 59 struct completion; 60 struct pt_regs; 61 struct user; 62 63 /** 64 * might_sleep - annotation for functions that can sleep 65 * 66 * this macro will print a stack trace if it is executed in an atomic 67 * context (spinlock, irq-handler, ...). 68 * 69 * This is a useful debugging help to be able to catch problems early and not 70 * be bitten later when the calling function happens to sleep when it is not 71 * supposed to. 72 */ 73 #ifdef CONFIG_PREEMPT_VOLUNTARY 74 extern int cond_resched(void); 75 # define might_resched() cond_resched() 76 #else 77 # define might_resched() do { } while (0) 78 #endif 79 80 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 81 void __might_sleep(char *file, int line); 82 # define might_sleep() \ 83 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) 84 #else 85 # define might_sleep() do { might_resched(); } while (0) 86 #endif 87 88 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 89 90 #define abs(x) ({ \ 91 int __x = (x); \ 92 (__x < 0) ? -__x : __x; \ 93 }) 94 95 #define labs(x) ({ \ 96 long __x = (x); \ 97 (__x < 0) ? -__x : __x; \ 98 }) 99 100 extern struct atomic_notifier_head panic_notifier_list; 101 extern long (*panic_blink)(long time); 102 NORET_TYPE void panic(const char * fmt, ...) 103 __attribute__ ((NORET_AND format (printf, 1, 2))); 104 extern void oops_enter(void); 105 extern void oops_exit(void); 106 extern int oops_may_print(void); 107 fastcall NORET_TYPE void do_exit(long error_code) 108 ATTRIB_NORET; 109 NORET_TYPE void complete_and_exit(struct completion *, long) 110 ATTRIB_NORET; 111 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 112 extern long simple_strtol(const char *,char **,unsigned int); 113 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 114 extern long long simple_strtoll(const char *,char **,unsigned int); 115 extern int sprintf(char * buf, const char * fmt, ...) 116 __attribute__ ((format (printf, 2, 3))); 117 extern int vsprintf(char *buf, const char *, va_list) 118 __attribute__ ((format (printf, 2, 0))); 119 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 120 __attribute__ ((format (printf, 3, 4))); 121 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 122 __attribute__ ((format (printf, 3, 0))); 123 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 124 __attribute__ ((format (printf, 3, 4))); 125 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 126 __attribute__ ((format (printf, 3, 0))); 127 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 128 __attribute__ ((format (printf, 2, 3))); 129 130 extern int sscanf(const char *, const char *, ...) 131 __attribute__ ((format (scanf, 2, 3))); 132 extern int vsscanf(const char *, const char *, va_list) 133 __attribute__ ((format (scanf, 2, 0))); 134 135 extern int get_option(char **str, int *pint); 136 extern char *get_options(const char *str, int nints, int *ints); 137 extern unsigned long long memparse(char *ptr, char **retptr); 138 139 extern int core_kernel_text(unsigned long addr); 140 extern int __kernel_text_address(unsigned long addr); 141 extern int kernel_text_address(unsigned long addr); 142 extern int session_of_pgrp(int pgrp); 143 144 extern void dump_thread(struct pt_regs *regs, struct user *dump); 145 146 #ifdef CONFIG_PRINTK 147 asmlinkage int vprintk(const char *fmt, va_list args) 148 __attribute__ ((format (printf, 1, 0))); 149 asmlinkage int printk(const char * fmt, ...) 150 __attribute__ ((format (printf, 1, 2))); 151 #else 152 static inline int vprintk(const char *s, va_list args) 153 __attribute__ ((format (printf, 1, 0))); 154 static inline int vprintk(const char *s, va_list args) { return 0; } 155 static inline int printk(const char *s, ...) 156 __attribute__ ((format (printf, 1, 2))); 157 static inline int printk(const char *s, ...) { return 0; } 158 #endif 159 160 unsigned long int_sqrt(unsigned long); 161 162 extern int printk_ratelimit(void); 163 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); 164 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 165 unsigned int interval_msec); 166 167 static inline void console_silent(void) 168 { 169 console_loglevel = 0; 170 } 171 172 static inline void console_verbose(void) 173 { 174 if (console_loglevel) 175 console_loglevel = 15; 176 } 177 178 extern void bust_spinlocks(int yes); 179 extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 180 extern int panic_timeout; 181 extern int panic_on_oops; 182 extern int panic_on_unrecovered_nmi; 183 extern int tainted; 184 extern const char *print_tainted(void); 185 extern void add_taint(unsigned); 186 187 /* Values used for system_state */ 188 extern enum system_states { 189 SYSTEM_BOOTING, 190 SYSTEM_RUNNING, 191 SYSTEM_HALT, 192 SYSTEM_POWER_OFF, 193 SYSTEM_RESTART, 194 SYSTEM_SUSPEND_DISK, 195 } system_state; 196 197 #define TAINT_PROPRIETARY_MODULE (1<<0) 198 #define TAINT_FORCED_MODULE (1<<1) 199 #define TAINT_UNSAFE_SMP (1<<2) 200 #define TAINT_FORCED_RMMOD (1<<3) 201 #define TAINT_MACHINE_CHECK (1<<4) 202 #define TAINT_BAD_PAGE (1<<5) 203 204 extern void dump_stack(void); 205 206 #ifdef DEBUG 207 /* If you are writing a driver, please use dev_dbg instead */ 208 #define pr_debug(fmt,arg...) \ 209 printk(KERN_DEBUG fmt,##arg) 210 #else 211 static inline int __attribute__ ((format (printf, 1, 2))) pr_debug(const char * fmt, ...) 212 { 213 return 0; 214 } 215 #endif 216 217 #define pr_info(fmt,arg...) \ 218 printk(KERN_INFO fmt,##arg) 219 220 /* 221 * Display an IP address in readable format. 222 */ 223 224 #define NIPQUAD(addr) \ 225 ((unsigned char *)&addr)[0], \ 226 ((unsigned char *)&addr)[1], \ 227 ((unsigned char *)&addr)[2], \ 228 ((unsigned char *)&addr)[3] 229 #define NIPQUAD_FMT "%u.%u.%u.%u" 230 231 #define NIP6(addr) \ 232 ntohs((addr).s6_addr16[0]), \ 233 ntohs((addr).s6_addr16[1]), \ 234 ntohs((addr).s6_addr16[2]), \ 235 ntohs((addr).s6_addr16[3]), \ 236 ntohs((addr).s6_addr16[4]), \ 237 ntohs((addr).s6_addr16[5]), \ 238 ntohs((addr).s6_addr16[6]), \ 239 ntohs((addr).s6_addr16[7]) 240 #define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" 241 #define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x" 242 243 #if defined(__LITTLE_ENDIAN) 244 #define HIPQUAD(addr) \ 245 ((unsigned char *)&addr)[3], \ 246 ((unsigned char *)&addr)[2], \ 247 ((unsigned char *)&addr)[1], \ 248 ((unsigned char *)&addr)[0] 249 #elif defined(__BIG_ENDIAN) 250 #define HIPQUAD NIPQUAD 251 #else 252 #error "Please fix asm/byteorder.h" 253 #endif /* __LITTLE_ENDIAN */ 254 255 /* 256 * min()/max() macros that also do 257 * strict type-checking.. See the 258 * "unnecessary" pointer comparison. 259 */ 260 #define min(x,y) ({ \ 261 typeof(x) _x = (x); \ 262 typeof(y) _y = (y); \ 263 (void) (&_x == &_y); \ 264 _x < _y ? _x : _y; }) 265 266 #define max(x,y) ({ \ 267 typeof(x) _x = (x); \ 268 typeof(y) _y = (y); \ 269 (void) (&_x == &_y); \ 270 _x > _y ? _x : _y; }) 271 272 /* 273 * ..and if you can't take the strict 274 * types, you can specify one yourself. 275 * 276 * Or not use min/max at all, of course. 277 */ 278 #define min_t(type,x,y) \ 279 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) 280 #define max_t(type,x,y) \ 281 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) 282 283 284 /** 285 * container_of - cast a member of a structure out to the containing structure 286 * @ptr: the pointer to the member. 287 * @type: the type of the container struct this is embedded in. 288 * @member: the name of the member within the struct. 289 * 290 */ 291 #define container_of(ptr, type, member) ({ \ 292 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 293 (type *)( (char *)__mptr - offsetof(type,member) );}) 294 295 /* 296 * Check at compile time that something is of a particular type. 297 * Always evaluates to 1 so you may use it easily in comparisons. 298 */ 299 #define typecheck(type,x) \ 300 ({ type __dummy; \ 301 typeof(x) __dummy2; \ 302 (void)(&__dummy == &__dummy2); \ 303 1; \ 304 }) 305 306 /* 307 * Check at compile time that 'function' is a certain type, or is a pointer 308 * to that type (needs to use typedef for the function type.) 309 */ 310 #define typecheck_fn(type,function) \ 311 ({ typeof(type) __tmp = function; \ 312 (void)__tmp; \ 313 }) 314 315 #endif /* __KERNEL__ */ 316 317 #define SI_LOAD_SHIFT 16 318 struct sysinfo { 319 long uptime; /* Seconds since boot */ 320 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 321 unsigned long totalram; /* Total usable main memory size */ 322 unsigned long freeram; /* Available memory size */ 323 unsigned long sharedram; /* Amount of shared memory */ 324 unsigned long bufferram; /* Memory used by buffers */ 325 unsigned long totalswap; /* Total swap space size */ 326 unsigned long freeswap; /* swap space still available */ 327 unsigned short procs; /* Number of current processes */ 328 unsigned short pad; /* explicit padding for m68k */ 329 unsigned long totalhigh; /* Total high memory size */ 330 unsigned long freehigh; /* Available high memory size */ 331 unsigned int mem_unit; /* Memory unit size in bytes */ 332 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 333 }; 334 335 /* Force a compilation error if condition is true */ 336 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 337 338 /* Force a compilation error if condition is true, but also produce a 339 result (of value 0 and type size_t), so the expression can be used 340 e.g. in a structure initializer (or where-ever else comma expressions 341 aren't permitted). */ 342 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) 343 344 /* Trap pasters of __FUNCTION__ at compile-time */ 345 #define __FUNCTION__ (__func__) 346 347 /* This helps us to avoid #ifdef CONFIG_NUMA */ 348 #ifdef CONFIG_NUMA 349 #define NUMA_BUILD 1 350 #else 351 #define NUMA_BUILD 0 352 #endif 353 354 #endif 355