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(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) 39 40 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 41 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) 42 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 43 44 #define KERN_EMERG "<0>" /* system is unusable */ 45 #define KERN_ALERT "<1>" /* action must be taken immediately */ 46 #define KERN_CRIT "<2>" /* critical conditions */ 47 #define KERN_ERR "<3>" /* error conditions */ 48 #define KERN_WARNING "<4>" /* warning conditions */ 49 #define KERN_NOTICE "<5>" /* normal but significant condition */ 50 #define KERN_INFO "<6>" /* informational */ 51 #define KERN_DEBUG "<7>" /* debug-level messages */ 52 53 extern int console_printk[]; 54 55 #define console_loglevel (console_printk[0]) 56 #define default_message_loglevel (console_printk[1]) 57 #define minimum_console_loglevel (console_printk[2]) 58 #define default_console_loglevel (console_printk[3]) 59 60 struct completion; 61 struct pt_regs; 62 struct user; 63 64 /** 65 * might_sleep - annotation for functions that can sleep 66 * 67 * this macro will print a stack trace if it is executed in an atomic 68 * context (spinlock, irq-handler, ...). 69 * 70 * This is a useful debugging help to be able to catch problems early and not 71 * be bitten later when the calling function happens to sleep when it is not 72 * supposed to. 73 */ 74 #ifdef CONFIG_PREEMPT_VOLUNTARY 75 extern int cond_resched(void); 76 # define might_resched() cond_resched() 77 #else 78 # define might_resched() do { } while (0) 79 #endif 80 81 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 82 void __might_sleep(char *file, int line); 83 # define might_sleep() \ 84 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) 85 #else 86 # define might_sleep() do { might_resched(); } while (0) 87 #endif 88 89 #define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 90 91 #define abs(x) ({ \ 92 int __x = (x); \ 93 (__x < 0) ? -__x : __x; \ 94 }) 95 96 extern struct atomic_notifier_head panic_notifier_list; 97 extern long (*panic_blink)(long time); 98 NORET_TYPE void panic(const char * fmt, ...) 99 __attribute__ ((NORET_AND format (printf, 1, 2))); 100 extern void oops_enter(void); 101 extern void oops_exit(void); 102 extern int oops_may_print(void); 103 fastcall NORET_TYPE void do_exit(long error_code) 104 ATTRIB_NORET; 105 NORET_TYPE void complete_and_exit(struct completion *, long) 106 ATTRIB_NORET; 107 extern unsigned long simple_strtoul(const char *,char **,unsigned int); 108 extern long simple_strtol(const char *,char **,unsigned int); 109 extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 110 extern long long simple_strtoll(const char *,char **,unsigned int); 111 extern int sprintf(char * buf, const char * fmt, ...) 112 __attribute__ ((format (printf, 2, 3))); 113 extern int vsprintf(char *buf, const char *, va_list) 114 __attribute__ ((format (printf, 2, 0))); 115 extern int snprintf(char * buf, size_t size, const char * fmt, ...) 116 __attribute__ ((format (printf, 3, 4))); 117 extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 118 __attribute__ ((format (printf, 3, 0))); 119 extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 120 __attribute__ ((format (printf, 3, 4))); 121 extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 122 __attribute__ ((format (printf, 3, 0))); 123 extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 124 __attribute__ ((format (printf, 2, 3))); 125 extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args); 126 127 extern int sscanf(const char *, const char *, ...) 128 __attribute__ ((format (scanf, 2, 3))); 129 extern int vsscanf(const char *, const char *, va_list) 130 __attribute__ ((format (scanf, 2, 0))); 131 132 extern int get_option(char **str, int *pint); 133 extern char *get_options(const char *str, int nints, int *ints); 134 extern unsigned long long memparse(char *ptr, char **retptr); 135 136 extern int core_kernel_text(unsigned long addr); 137 extern int __kernel_text_address(unsigned long addr); 138 extern int kernel_text_address(unsigned long addr); 139 struct pid; 140 extern struct pid *session_of_pgrp(struct pid *pgrp); 141 142 extern void dump_thread(struct pt_regs *regs, struct user *dump); 143 144 #ifdef CONFIG_PRINTK 145 asmlinkage int vprintk(const char *fmt, va_list args) 146 __attribute__ ((format (printf, 1, 0))); 147 asmlinkage int printk(const char * fmt, ...) 148 __attribute__ ((format (printf, 1, 2))); 149 #else 150 static inline int vprintk(const char *s, va_list args) 151 __attribute__ ((format (printf, 1, 0))); 152 static inline int vprintk(const char *s, va_list args) { return 0; } 153 static inline int printk(const char *s, ...) 154 __attribute__ ((format (printf, 1, 2))); 155 static inline int printk(const char *s, ...) { return 0; } 156 #endif 157 158 unsigned long int_sqrt(unsigned long); 159 160 extern int printk_ratelimit(void); 161 extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); 162 extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, 163 unsigned int interval_msec); 164 165 static inline void console_silent(void) 166 { 167 console_loglevel = 0; 168 } 169 170 static inline void console_verbose(void) 171 { 172 if (console_loglevel) 173 console_loglevel = 15; 174 } 175 176 extern void bust_spinlocks(int yes); 177 extern void wake_up_klogd(void); 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 #define TAINT_USER (1<<6) 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 struct sysinfo; 316 extern int do_sysinfo(struct sysinfo *info); 317 318 #endif /* __KERNEL__ */ 319 320 #define SI_LOAD_SHIFT 16 321 struct sysinfo { 322 long uptime; /* Seconds since boot */ 323 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 324 unsigned long totalram; /* Total usable main memory size */ 325 unsigned long freeram; /* Available memory size */ 326 unsigned long sharedram; /* Amount of shared memory */ 327 unsigned long bufferram; /* Memory used by buffers */ 328 unsigned long totalswap; /* Total swap space size */ 329 unsigned long freeswap; /* swap space still available */ 330 unsigned short procs; /* Number of current processes */ 331 unsigned short pad; /* explicit padding for m68k */ 332 unsigned long totalhigh; /* Total high memory size */ 333 unsigned long freehigh; /* Available high memory size */ 334 unsigned int mem_unit; /* Memory unit size in bytes */ 335 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 336 }; 337 338 /* Force a compilation error if condition is true */ 339 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 340 341 /* Force a compilation error if condition is true, but also produce a 342 result (of value 0 and type size_t), so the expression can be used 343 e.g. in a structure initializer (or where-ever else comma expressions 344 aren't permitted). */ 345 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) 346 347 /* Trap pasters of __FUNCTION__ at compile-time */ 348 #define __FUNCTION__ (__func__) 349 350 /* This helps us to avoid #ifdef CONFIG_NUMA */ 351 #ifdef CONFIG_NUMA 352 #define NUMA_BUILD 1 353 #else 354 #define NUMA_BUILD 0 355 #endif 356 357 #endif 358