share/kernelcompat.h

   1 #ifndef KERNELCOMPAT_H
   2 #define KERNELCOMPAT_H
   3
   4 #include "compiler.h"
   5
   6 #include <string.h>
   7
   8 #define container_of(ptr, type, member) ({                      \
   9         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
  10         (type *)( (char *)__mptr - offsetof(type,member) );})
  11
  12 #define KERN_DEBUG ""
  13 #define KERN_NOTICE ""
  14 #define KERN_INFO ""
  15 #define KERN_ERR ""
  16 #define KERN_ALERT ""
  17 #define KERN_WARNING ""
  18
  19 /* ERROR OPS */
  20
  21 #define MAX_ERRNO       4095
  22
  23 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
  24
  25 static inline void *ERR_PTR(long error)
  26 {
  27         return (void *) error;
  28 }
  29
  30 static inline long PTR_ERR(const void *ptr)
  31 {
  32         return (long) ptr;
  33 }
  34
  35 static inline long IS_ERR(const void *ptr)
  36 {
  37         return IS_ERR_VALUE((unsigned long)ptr);
  38 }
  39
  40
  41 /* FIXED SIZE INTEGERS */
  42
  43 #include <stdint.h>
  44
  45 typedef uint8_t u8;
  46 typedef uint16_t u16;
  47 typedef uint32_t u32;
  48 typedef uint64_t u64;
  49
  50 #define min_t(type, x, y) ({                    \
  51         type __min1 = (x);                      \
  52         type __min2 = (y);                      \
  53         __min1 < __min2 ? __min1: __min2; })
  54
  55 #define max_t(type, x, y) ({                    \
  56         type __max1 = (x);                      \
  57         type __max2 = (y);                      \
  58         __max1 > __max2 ? __max1: __max2; })
  59
  60
  61 /* MUTEXES */
  62
  63 #include <pthread.h>
  64
  65 #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER;
  66 #define DECLARE_MUTEX(m) extern pthread_mutex_t (m);
  67
  68 #define mutex_lock(m) pthread_mutex_lock(m)
  69
  70 #define mutex_unlock(m) pthread_mutex_unlock(m)
  71
  72 /* SPINLOCKS */
  73
  74 typedef int spinlock_t;
  75
  76 #define spin_lock(a) /* nothing */
  77 #define spin_unlock(a) /* nothing */
  78 #define spin_lock_init(a) /* nothing */
  79
  80
  81 /* MALLOCATION */
  82
  83 #include <stdlib.h>
  84
  85 #define kmalloc(s, t) malloc(s)
  86 #define kzalloc(s, t) zmalloc(s)
  87 #define kfree(p) free((void *)p)
  88 #define kstrdup(s, t) strdup(s)
  89
  90 #define zmalloc(s) calloc(1, s)
  91
  92 #define GFP_KERNEL
  93
  94 /* PRINTK */
  95
  96 #include <stdio.h>
  97 #define printk(fmt, args...) printf(fmt, ## args)
  98
  99 /* MEMORY BARRIERS */
 100
 101 #define smp_rmb() do {} while(0)
 102 #define smp_wmb() do {} while(0)
 103 #define smp_mb() do {} while(0)
 104 #define smp_mb__after_atomic_inc() do {} while(0)
 105
 106 #define read_barrier_depends() do {} while(0)
 107 #define smp_read_barrier_depends() do {} while(0)
 108
 109 /* RCU */
 110
 111 #define rcu_assign_pointer(a, b) do {} while(0)
 112 #define call_rcu_sched(a,b) do {} while(0)
 113 #define rcu_barrier_sched() do {} while(0)
 114 #define rcu_read_lock_sched_notrace() do{} while (0)
 115 #define rcu_read_unlock_sched_notrace() do{} while (0)
 116
 117 /* ATOMICITY */
 118
 119 #include <signal.h>
 120
 121 typedef struct { sig_atomic_t counter; } atomic_t;
 122
 123 static inline int atomic_dec_and_test(atomic_t *p)
 124 {
 125         (p->counter)--;
 126         return !p->counter;
 127 }
 128
 129 static inline void atomic_set(atomic_t *p, int v)
 130 {
 131         p->counter=v;
 132 }
 133
 134 static inline void atomic_inc(atomic_t *p)
 135 {
 136         p->counter++;
 137 }
 138
 139 static int atomic_read(atomic_t *p)
 140 {
 141         return p->counter;
 142 }
 143
 144 #define atomic_long_t atomic_t
 145 #define atomic_long_set atomic_set
 146 #define atomic_long_read atomic_read
 147
 148 #include "asm.h"
 149
 150 #define __xg(x) ((volatile long *)(x))
 151
 152 #define cmpxchg(ptr, o, n)                                              \
 153         ((__typeof__(*(ptr)))__cmpxchg((ptr), (unsigned long)(o),       \
 154                                        (unsigned long)(n), sizeof(*(ptr))))
 155
 156 static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
 157                                       unsigned long new, int size)
 158 {
 159         unsigned long prev;
 160         switch (size) {
 161         case 1:
 162                 asm volatile("lock cmpxchgb %b1,%2"
 163                              : "=a"(prev)
 164                              : "q"(new), "m"(*__xg(ptr)), "0"(old)
 165                              : "memory");
 166                 return prev;
 167         case 2:
 168                 asm volatile("lock cmpxchgw %w1,%2"
 169                              : "=a"(prev)
 170                              : "r"(new), "m"(*__xg(ptr)), "0"(old)
 171                              : "memory");
 172                 return prev;
 173         case 4:
 174                 asm volatile("lock cmpxchgl %k1,%2"
 175                              : "=a"(prev)
 176                              : "r"(new), "m"(*__xg(ptr)), "0"(old)
 177                              : "memory");
 178                 return prev;
 179         case 8:
 180                 asm volatile("lock cmpxchgq %1,%2"
 181                              : "=a"(prev)
 182                              : "r"(new), "m"(*__xg(ptr)), "0"(old)
 183                              : "memory");
 184                 return prev;
 185         }
 186         return old;
 187 }
 188
 189 #define local_cmpxchg cmpxchg
 190 #define atomic_long_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))
 191
 192
 193 /* LOCAL OPS */
 194
 195 typedef int local_t;
 196
 197 static inline void local_inc(local_t *a)
 198 {
 199         (*a)++;
 200 }
 201
 202 static inline void local_set(local_t *a, int v)
 203 {
 204         *a = v;
 205 }
 206
 207 static inline void local_add(int v, local_t *a)
 208 {
 209         *a += v;
 210 }
 211
 212 static int local_add_return(int v, local_t *a)
 213 {
 214         return *a += v;
 215 }
 216
 217 static inline int local_read(local_t *a)
 218 {
 219         return *a;
 220 }
 221
 222
 223 /* ATTRIBUTES */
 224
 225 #define ____cacheline_aligned
 226 #define __init
 227 #define __exit
 228
 229 /* MATH */
 230
 231 static inline unsigned int hweight32(unsigned int w)
 232 {
 233         unsigned int res = w - ((w >> 1) & 0x55555555);
 234         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 235         res = (res + (res >> 4)) & 0x0F0F0F0F;
 236         res = res + (res >> 8);
 237         return (res + (res >> 16)) & 0x000000FF;
 238 }
 239
 240 static inline int fls(int x)
 241 {
 242         int r;
 243 //ust// #ifdef CONFIG_X86_CMOV
 244         asm("bsrl %1,%0\n\t"
 245             "cmovzl %2,%0"
 246             : "=&r" (r) : "rm" (x), "rm" (-1));
 247 //ust// #else
 248 //ust//         asm("bsrl %1,%0\n\t"
 249 //ust//             "jnz 1f\n\t"
 250 //ust//             "movl $-1,%0\n"
 251 //ust//             "1:" : "=r" (r) : "rm" (x));
 252 //ust// #endif
 253         return r + 1;
 254 }
 255
 256 static __inline__ int get_count_order(unsigned int count)
 257 {
 258         int order;
 259
 260         order = fls(count) - 1;
 261         if (count & (count - 1))
 262                 order++;
 263         return order;
 264 }
 265
 266
 267
 268
 269 #include <unistd.h>
 270
 271 #define ALIGN(x,a)              __ALIGN_MASK(x,(typeof(x))(a)-1)
 272 #define __ALIGN_MASK(x,mask)    (((x)+(mask))&~(mask))
 273 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
 274 #define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
 275 #define PAGE_MASK (PAGE_SIZE-1)
 276
 277
 278
 279
 280 /* ARRAYS */
 281
 282 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 283
 284 /* TRACE CLOCK */
 285
 286 static inline u64 trace_clock_read64(void)
 287 {
 288         return 0LL;
 289 }
 290
 291 static inline unsigned int trace_clock_frequency(void)
 292 {
 293         return 0LL;
 294 }
 295
 296 static inline u32 trace_clock_freq_scale(void)
 297 {
 298         return 0;
 299 }
 300
 301
 302 /* LISTS */
 303
 304 #define list_add_rcu list_add
 305 #define list_for_each_entry_rcu list_for_each_entry
 306
 307
 308 #define EXPORT_SYMBOL_GPL(a) /*nothing*/
 309
 310 #define smp_processor_id() (-1)
 311
 312 #endif /* KERNELCOMPAT_H */