Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 61 | #ifdef CONFIG_PREEMPT_VOLUNTARY |
| 62 | extern int cond_resched(void); |
| 63 | # define might_resched() cond_resched() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | #else |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 65 | # define might_resched() do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #endif |
| 67 | |
Ingo Molnar | f8cbd99 | 2005-06-25 14:57:39 -0700 | [diff] [blame] | 68 | #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP |
| 69 | void __might_sleep(char *file, int line); |
| 70 | # define might_sleep() \ |
| 71 | do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) |
| 72 | #else |
| 73 | # define might_sleep() do { might_resched(); } while (0) |
| 74 | #endif |
| 75 | |
| 76 | #define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0) |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | #define abs(x) ({ \ |
| 79 | int __x = (x); \ |
| 80 | (__x < 0) ? -__x : __x; \ |
| 81 | }) |
| 82 | |
| 83 | #define labs(x) ({ \ |
| 84 | long __x = (x); \ |
| 85 | (__x < 0) ? -__x : __x; \ |
| 86 | }) |
| 87 | |
| 88 | extern struct notifier_block *panic_notifier_list; |
| 89 | extern long (*panic_blink)(long time); |
| 90 | NORET_TYPE void panic(const char * fmt, ...) |
| 91 | __attribute__ ((NORET_AND format (printf, 1, 2))); |
| 92 | fastcall NORET_TYPE void do_exit(long error_code) |
| 93 | ATTRIB_NORET; |
| 94 | NORET_TYPE void complete_and_exit(struct completion *, long) |
| 95 | ATTRIB_NORET; |
| 96 | extern unsigned long simple_strtoul(const char *,char **,unsigned int); |
| 97 | extern long simple_strtol(const char *,char **,unsigned int); |
| 98 | extern unsigned long long simple_strtoull(const char *,char **,unsigned int); |
| 99 | extern long long simple_strtoll(const char *,char **,unsigned int); |
| 100 | extern int sprintf(char * buf, const char * fmt, ...) |
| 101 | __attribute__ ((format (printf, 2, 3))); |
| 102 | extern int vsprintf(char *buf, const char *, va_list) |
| 103 | __attribute__ ((format (printf, 2, 0))); |
| 104 | extern int snprintf(char * buf, size_t size, const char * fmt, ...) |
| 105 | __attribute__ ((format (printf, 3, 4))); |
| 106 | extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 107 | __attribute__ ((format (printf, 3, 0))); |
| 108 | extern int scnprintf(char * buf, size_t size, const char * fmt, ...) |
| 109 | __attribute__ ((format (printf, 3, 4))); |
| 110 | extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) |
| 111 | __attribute__ ((format (printf, 3, 0))); |
| 112 | |
| 113 | extern int sscanf(const char *, const char *, ...) |
| 114 | __attribute__ ((format (scanf, 2, 3))); |
| 115 | extern int vsscanf(const char *, const char *, va_list) |
| 116 | __attribute__ ((format (scanf, 2, 0))); |
| 117 | |
| 118 | extern int get_option(char **str, int *pint); |
| 119 | extern char *get_options(const char *str, int nints, int *ints); |
| 120 | extern unsigned long long memparse(char *ptr, char **retptr); |
| 121 | |
| 122 | extern int __kernel_text_address(unsigned long addr); |
| 123 | extern int kernel_text_address(unsigned long addr); |
| 124 | extern int session_of_pgrp(int pgrp); |
| 125 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 126 | #ifdef CONFIG_PRINTK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | asmlinkage int vprintk(const char *fmt, va_list args) |
| 128 | __attribute__ ((format (printf, 1, 0))); |
| 129 | asmlinkage int printk(const char * fmt, ...) |
| 130 | __attribute__ ((format (printf, 1, 2))); |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 131 | #else |
| 132 | static inline int vprintk(const char *s, va_list args) |
| 133 | __attribute__ ((format (printf, 1, 0))); |
| 134 | static inline int vprintk(const char *s, va_list args) { return 0; } |
| 135 | static inline int printk(const char *s, ...) |
| 136 | __attribute__ ((format (printf, 1, 2))); |
| 137 | static inline int printk(const char *s, ...) { return 0; } |
| 138 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
| 140 | unsigned long int_sqrt(unsigned long); |
| 141 | |
| 142 | static inline int __attribute_pure__ long_log2(unsigned long x) |
| 143 | { |
| 144 | int r = 0; |
| 145 | for (x >>= 1; x > 0; x >>= 1) |
| 146 | r++; |
| 147 | return r; |
| 148 | } |
| 149 | |
| 150 | static inline unsigned long __attribute_const__ roundup_pow_of_two(unsigned long x) |
| 151 | { |
| 152 | return (1UL << fls(x - 1)); |
| 153 | } |
| 154 | |
| 155 | extern int printk_ratelimit(void); |
| 156 | extern int __printk_ratelimit(int ratelimit_jiffies, int ratelimit_burst); |
| 157 | |
| 158 | static inline void console_silent(void) |
| 159 | { |
| 160 | console_loglevel = 0; |
| 161 | } |
| 162 | |
| 163 | static inline void console_verbose(void) |
| 164 | { |
| 165 | if (console_loglevel) |
| 166 | console_loglevel = 15; |
| 167 | } |
| 168 | |
| 169 | extern void bust_spinlocks(int yes); |
| 170 | extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */ |
Adrian Bunk | dfed044 | 2005-11-07 01:01:44 -0800 | [diff] [blame^] | 171 | extern __deprecated_for_modules int panic_timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | extern int panic_on_oops; |
| 173 | extern int tainted; |
| 174 | extern const char *print_tainted(void); |
| 175 | extern void add_taint(unsigned); |
| 176 | |
| 177 | /* Values used for system_state */ |
| 178 | extern enum system_states { |
| 179 | SYSTEM_BOOTING, |
| 180 | SYSTEM_RUNNING, |
| 181 | SYSTEM_HALT, |
| 182 | SYSTEM_POWER_OFF, |
| 183 | SYSTEM_RESTART, |
| 184 | } system_state; |
| 185 | |
| 186 | #define TAINT_PROPRIETARY_MODULE (1<<0) |
| 187 | #define TAINT_FORCED_MODULE (1<<1) |
| 188 | #define TAINT_UNSAFE_SMP (1<<2) |
| 189 | #define TAINT_FORCED_RMMOD (1<<3) |
| 190 | #define TAINT_MACHINE_CHECK (1<<4) |
| 191 | #define TAINT_BAD_PAGE (1<<5) |
| 192 | |
| 193 | extern void dump_stack(void); |
| 194 | |
| 195 | #ifdef DEBUG |
| 196 | #define pr_debug(fmt,arg...) \ |
| 197 | printk(KERN_DEBUG fmt,##arg) |
| 198 | #else |
| 199 | #define pr_debug(fmt,arg...) \ |
| 200 | do { } while (0) |
| 201 | #endif |
| 202 | |
| 203 | #define pr_info(fmt,arg...) \ |
| 204 | printk(KERN_INFO fmt,##arg) |
| 205 | |
| 206 | /* |
| 207 | * Display an IP address in readable format. |
| 208 | */ |
| 209 | |
| 210 | #define NIPQUAD(addr) \ |
| 211 | ((unsigned char *)&addr)[0], \ |
| 212 | ((unsigned char *)&addr)[1], \ |
| 213 | ((unsigned char *)&addr)[2], \ |
| 214 | ((unsigned char *)&addr)[3] |
| 215 | |
| 216 | #define NIP6(addr) \ |
| 217 | ntohs((addr).s6_addr16[0]), \ |
| 218 | ntohs((addr).s6_addr16[1]), \ |
| 219 | ntohs((addr).s6_addr16[2]), \ |
| 220 | ntohs((addr).s6_addr16[3]), \ |
| 221 | ntohs((addr).s6_addr16[4]), \ |
| 222 | ntohs((addr).s6_addr16[5]), \ |
| 223 | ntohs((addr).s6_addr16[6]), \ |
| 224 | ntohs((addr).s6_addr16[7]) |
| 225 | |
| 226 | #if defined(__LITTLE_ENDIAN) |
| 227 | #define HIPQUAD(addr) \ |
| 228 | ((unsigned char *)&addr)[3], \ |
| 229 | ((unsigned char *)&addr)[2], \ |
| 230 | ((unsigned char *)&addr)[1], \ |
| 231 | ((unsigned char *)&addr)[0] |
| 232 | #elif defined(__BIG_ENDIAN) |
| 233 | #define HIPQUAD NIPQUAD |
| 234 | #else |
| 235 | #error "Please fix asm/byteorder.h" |
| 236 | #endif /* __LITTLE_ENDIAN */ |
| 237 | |
| 238 | /* |
| 239 | * min()/max() macros that also do |
| 240 | * strict type-checking.. See the |
| 241 | * "unnecessary" pointer comparison. |
| 242 | */ |
| 243 | #define min(x,y) ({ \ |
| 244 | typeof(x) _x = (x); \ |
| 245 | typeof(y) _y = (y); \ |
| 246 | (void) (&_x == &_y); \ |
| 247 | _x < _y ? _x : _y; }) |
| 248 | |
| 249 | #define max(x,y) ({ \ |
| 250 | typeof(x) _x = (x); \ |
| 251 | typeof(y) _y = (y); \ |
| 252 | (void) (&_x == &_y); \ |
| 253 | _x > _y ? _x : _y; }) |
| 254 | |
| 255 | /* |
| 256 | * ..and if you can't take the strict |
| 257 | * types, you can specify one yourself. |
| 258 | * |
| 259 | * Or not use min/max at all, of course. |
| 260 | */ |
| 261 | #define min_t(type,x,y) \ |
| 262 | ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; }) |
| 263 | #define max_t(type,x,y) \ |
| 264 | ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; }) |
| 265 | |
| 266 | |
| 267 | /** |
| 268 | * container_of - cast a member of a structure out to the containing structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | * @ptr: the pointer to the member. |
| 270 | * @type: the type of the container struct this is embedded in. |
| 271 | * @member: the name of the member within the struct. |
| 272 | * |
| 273 | */ |
| 274 | #define container_of(ptr, type, member) ({ \ |
| 275 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 276 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
| 277 | |
| 278 | /* |
| 279 | * Check at compile time that something is of a particular type. |
| 280 | * Always evaluates to 1 so you may use it easily in comparisons. |
| 281 | */ |
| 282 | #define typecheck(type,x) \ |
| 283 | ({ type __dummy; \ |
| 284 | typeof(x) __dummy2; \ |
| 285 | (void)(&__dummy == &__dummy2); \ |
| 286 | 1; \ |
| 287 | }) |
| 288 | |
| 289 | #endif /* __KERNEL__ */ |
| 290 | |
| 291 | #define SI_LOAD_SHIFT 16 |
| 292 | struct sysinfo { |
| 293 | long uptime; /* Seconds since boot */ |
| 294 | unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ |
| 295 | unsigned long totalram; /* Total usable main memory size */ |
| 296 | unsigned long freeram; /* Available memory size */ |
| 297 | unsigned long sharedram; /* Amount of shared memory */ |
| 298 | unsigned long bufferram; /* Memory used by buffers */ |
| 299 | unsigned long totalswap; /* Total swap space size */ |
| 300 | unsigned long freeswap; /* swap space still available */ |
| 301 | unsigned short procs; /* Number of current processes */ |
| 302 | unsigned short pad; /* explicit padding for m68k */ |
| 303 | unsigned long totalhigh; /* Total high memory size */ |
| 304 | unsigned long freehigh; /* Available high memory size */ |
| 305 | unsigned int mem_unit; /* Memory unit size in bytes */ |
| 306 | char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */ |
| 307 | }; |
| 308 | |
Nikita Danilov | c0398ee | 2005-10-30 15:03:10 -0800 | [diff] [blame] | 309 | /* Force a compilation error if condition is true */ |
Andi Kleen | 921717a | 2005-09-13 01:25:13 -0700 | [diff] [blame] | 310 | #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | |
| 312 | #ifdef CONFIG_SYSCTL |
| 313 | extern int randomize_va_space; |
| 314 | #else |
| 315 | #define randomize_va_space 1 |
| 316 | #endif |
| 317 | |
| 318 | /* Trap pasters of __FUNCTION__ at compile-time */ |
| 319 | #if __GNUC__ > 2 || __GNUC_MINOR__ >= 95 |
| 320 | #define __FUNCTION__ (__func__) |
| 321 | #endif |
| 322 | |
| 323 | #endif |