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 19extern 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#define LLONG_MAX ((long long)(~0ULL>>1)) 28#define LLONG_MIN (-LLONG_MAX - 1) 29#define ULLONG_MAX (~0ULL) 30 31#define STACK_MAGIC 0xdeadbeef 32 33#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 34#define ALIGN(x,a) (((x)+(a)-1)&~((a)-1)) 35#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) 36#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 37 38#define KERN_EMERG "<0>" /* system is unusable */ 39#define KERN_ALERT "<1>" /* action must be taken immediately */ 40#define KERN_CRIT "<2>" /* critical conditions */ 41#define KERN_ERR "<3>" /* error conditions */ 42#define KERN_WARNING "<4>" /* warning conditions */ 43#define KERN_NOTICE "<5>" /* normal but significant condition */ 44#define KERN_INFO "<6>" /* informational */ 45#define KERN_DEBUG "<7>" /* debug-level messages */ 46 47extern int console_printk[]; 48 49#define console_loglevel (console_printk[0]) 50#define default_message_loglevel (console_printk[1]) 51#define minimum_console_loglevel (console_printk[2]) 52#define default_console_loglevel (console_printk[3]) 53 54struct completion; 55struct pt_regs; 56struct user; 57 58/** 59 * might_sleep - annotation for functions that can sleep 60 * 61 * this macro will print a stack trace if it is executed in an atomic 62 * context (spinlock, irq-handler, ...). 63 * 64 * This is a useful debugging help to be able to catch problems early and not 65 * be biten later when the calling function happens to sleep when it is not 66 * supposed to. 67 */ 68#ifdef CONFIG_PREEMPT_VOLUNTARY 69extern int cond_resched(void); 70# define might_resched() cond_resched() 71#else 72# define might_resched() do { } while (0) 73#endif 74 75#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 76 void __might_sleep(char *file, int line); 77# define might_sleep() \ 78 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) 79#else 80# define might_sleep() do { might_resched(); } while (0) 81#endif 82 83#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0) 84 85#define abs(x) ({ \ 86 int __x = (x); \ 87 (__x < 0) ? -__x : __x; \ 88 }) 89 90#define labs(x) ({ \ 91 long __x = (x); \ 92 (__x < 0) ? -__x : __x; \ 93 }) 94 95extern struct atomic_notifier_head panic_notifier_list; 96extern long (*panic_blink)(long time); 97NORET_TYPE void panic(const char * fmt, ...) 98 __attribute__ ((NORET_AND format (printf, 1, 2))); 99extern void oops_enter(void); 100extern void oops_exit(void); 101extern int oops_may_print(void); 102fastcall NORET_TYPE void do_exit(long error_code) 103 ATTRIB_NORET; 104NORET_TYPE void complete_and_exit(struct completion *, long) 105 ATTRIB_NORET; 106extern unsigned long simple_strtoul(const char *,char **,unsigned int); 107extern long simple_strtol(const char *,char **,unsigned int); 108extern unsigned long long simple_strtoull(const char *,char **,unsigned int); 109extern long long simple_strtoll(const char *,char **,unsigned int); 110extern int sprintf(char * buf, const char * fmt, ...) 111 __attribute__ ((format (printf, 2, 3))); 112extern int vsprintf(char *buf, const char *, va_list) 113 __attribute__ ((format (printf, 2, 0))); 114extern int snprintf(char * buf, size_t size, const char * fmt, ...) 115 __attribute__ ((format (printf, 3, 4))); 116extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 117 __attribute__ ((format (printf, 3, 0))); 118extern int scnprintf(char * buf, size_t size, const char * fmt, ...) 119 __attribute__ ((format (printf, 3, 4))); 120extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 121 __attribute__ ((format (printf, 3, 0))); 122extern char *kasprintf(gfp_t gfp, const char *fmt, ...) 123 __attribute__ ((format (printf, 2, 3))); 124 125extern int sscanf(const char *, const char *, ...) 126 __attribute__ ((format (scanf, 2, 3))); 127extern int vsscanf(const char *, const char *, va_list) 128 __attribute__ ((format (scanf, 2, 0))); 129 130extern int get_option(char **str, int *pint); 131extern char *get_options(const char *str, int nints, int *ints); 132extern unsigned long long memparse(char *ptr, char **retptr); 133 134extern int core_kernel_text(unsigned long addr); 135extern int __kernel_text_address(unsigned long addr); 136extern int kernel_text_address(unsigned long addr); 137extern int session_of_pgrp(int pgrp); 138 139extern void dump_thread(struct pt_regs *regs, struct user *dump); 140 141#ifdef CONFIG_PRINTK 142asmlinkage int vprintk(const char *fmt, va_list args) 143 __attribute__ ((format (printf, 1, 0))); 144asmlinkage int printk(const char * fmt, ...) 145 __attribute__ ((format (printf, 1, 2))); 146#else 147static inline int vprintk(const char *s, va_list args) 148 __attribute__ ((format (printf, 1, 0))); 149static inline int vprintk(const char *s, va_list args) { return 0; } 150static inline int printk(const char *s, ...) 151 __attribute__ ((format (printf, 1, 2))); 152static inline int printk(const char *s, ...) { return 0; } 153#endif 154 155unsigned long int_sqrt(unsigned long); 156 157static inline int __attribute_pure__ long_log2(unsigned long x) 158{ 159 int r = 0; 160 for (x >>= 1; x > 0; x >>= 1) 161 r++; 162 return r; 163} 164 165static inline unsigned long 166__attribute_const__ roundup_pow_of_two(unsigned long x) 167{ 168 return 1UL << fls_long(x - 1); 169} 170 171extern int printk_ratelimit(void); 172extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); 173 174static inline void console_silent(void) 175{ 176 console_loglevel = 0; 177} 178 179static inline void console_verbose(void) 180{ 181 if (console_loglevel) 182 console_loglevel = 15; 183} 184 185extern void bust_spinlocks(int yes); 186extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ 187extern int panic_timeout; 188extern int panic_on_oops; 189extern int tainted; 190extern const char *print_tainted(void); 191extern void add_taint(unsigned); 192 193/* Values used for system_state */ 194extern enum system_states { 195 SYSTEM_BOOTING, 196 SYSTEM_RUNNING, 197 SYSTEM_HALT, 198 SYSTEM_POWER_OFF, 199 SYSTEM_RESTART, 200 SYSTEM_SUSPEND_DISK, 201} system_state; 202 203#define TAINT_PROPRIETARY_MODULE (1<<0) 204#define TAINT_FORCED_MODULE (1<<1) 205#define TAINT_UNSAFE_SMP (1<<2) 206#define TAINT_FORCED_RMMOD (1<<3) 207#define TAINT_MACHINE_CHECK (1<<4) 208#define TAINT_BAD_PAGE (1<<5) 209 210extern void dump_stack(void); 211 212#ifdef DEBUG 213/* If you are writing a driver, please use dev_dbg instead */ 214#define pr_debug(fmt,arg...) \ 215 printk(KERN_DEBUG fmt,##arg) 216#else 217#define pr_debug(fmt,arg...) \ 218 do { } while (0) 219#endif 220 221#define pr_info(fmt,arg...) \ 222 printk(KERN_INFO fmt,##arg) 223 224/* 225 * Display an IP address in readable format. 226 */ 227 228#define NIPQUAD(addr) \ 229 ((unsigned char *)&addr)[0], \ 230 ((unsigned char *)&addr)[1], \ 231 ((unsigned char *)&addr)[2], \ 232 ((unsigned char *)&addr)[3] 233#define NIPQUAD_FMT "%u.%u.%u.%u" 234 235#define NIP6(addr) \ 236 ntohs((addr).s6_addr16[0]), \ 237 ntohs((addr).s6_addr16[1]), \ 238 ntohs((addr).s6_addr16[2]), \ 239 ntohs((addr).s6_addr16[3]), \ 240 ntohs((addr).s6_addr16[4]), \ 241 ntohs((addr).s6_addr16[5]), \ 242 ntohs((addr).s6_addr16[6]), \ 243 ntohs((addr).s6_addr16[7]) 244#define NIP6_FMT "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" 245#define NIP6_SEQFMT "%04x%04x%04x%04x%04x%04x%04x%04x" 246 247#if defined(__LITTLE_ENDIAN) 248#define HIPQUAD(addr) \ 249 ((unsigned char *)&addr)[3], \ 250 ((unsigned char *)&addr)[2], \ 251 ((unsigned char *)&addr)[1], \ 252 ((unsigned char *)&addr)[0] 253#elif defined(__BIG_ENDIAN) 254#define HIPQUAD NIPQUAD 255#else 256#error "Please fix asm/byteorder.h" 257#endif /* __LITTLE_ENDIAN */ 258 259/* 260 * min()/max() macros that also do 261 * strict type-checking.. See the 262 * "unnecessary" pointer comparison. 263 */ 264#define min(x,y) ({ \ 265 typeof(x) _x = (x); \ 266 typeof(y) _y = (y); \ 267 (void) (&_x == &_y); \ 268 _x < _y ? _x : _y; }) 269 270#define max(x,y) ({ \ 271 typeof(x) _x = (x); \ 272 typeof(y) _y = (y); \ 273 (void) (&_x == &_y); \ 274 _x > _y ? _x : _y; }) 275 276/* 277 * ..and if you can't take the strict 278 * types, you can specify one yourself. 279 * 280 * Or not use min/max at all, of course. 281 */ 282#define min_t(type,x,y) \ 283 ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) 284#define max_t(type,x,y) \ 285 ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) 286 287 288/** 289 * container_of - cast a member of a structure out to the containing structure 290 * @ptr: the pointer to the member. 291 * @type: the type of the container struct this is embedded in. 292 * @member: the name of the member within the struct. 293 * 294 */ 295#define container_of(ptr, type, member) ({ \ 296 const typeof( ((type *)0)->member ) *__mptr = (ptr); \ 297 (type *)( (char *)__mptr - offsetof(type,member) );}) 298 299/* 300 * Check at compile time that something is of a particular type. 301 * Always evaluates to 1 so you may use it easily in comparisons. 302 */ 303#define typecheck(type,x) \ 304({ type __dummy; \ 305 typeof(x) __dummy2; \ 306 (void)(&__dummy == &__dummy2); \ 307 1; \ 308}) 309 310/* 311 * Check at compile time that 'function' is a certain type, or is a pointer 312 * to that type (needs to use typedef for the function type.) 313 */ 314#define typecheck_fn(type,function) \ 315({ typeof(type) __tmp = function; \ 316 (void)__tmp; \ 317}) 318 319#endif /* __KERNEL__ */ 320 321#define SI_LOAD_SHIFT 16 322struct sysinfo { 323 long uptime; /* Seconds since boot */ 324 unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ 325 unsigned long totalram; /* Total usable main memory size */ 326 unsigned long freeram; /* Available memory size */ 327 unsigned long sharedram; /* Amount of shared memory */ 328 unsigned long bufferram; /* Memory used by buffers */ 329 unsigned long totalswap; /* Total swap space size */ 330 unsigned long freeswap; /* swap space still available */ 331 unsigned short procs; /* Number of current processes */ 332 unsigned short pad; /* explicit padding for m68k */ 333 unsigned long totalhigh; /* Total high memory size */ 334 unsigned long freehigh; /* Available high memory size */ 335 unsigned int mem_unit; /* Memory unit size in bytes */ 336 char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ 337}; 338 339/* Force a compilation error if condition is true */ 340#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) 341 342/* Force a compilation error if condition is true, but also produce a 343 result (of value 0 and type size_t), so the expression can be used 344 e.g. in a structure initializer (or where-ever else comma expressions 345 aren't permitted). */ 346#define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) 347 348/* Trap pasters of __FUNCTION__ at compile-time */ 349#define __FUNCTION__ (__func__) 350 351#endif 352