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