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