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Linux v2.6.15-rc7
[pohmelfs.git] / include / asm-h8300 / bitops.h
blob5036f595f8c927d1ebbb167d7e9e8cf93ae84603
1 #ifndef _H8300_BITOPS_H
2 #define _H8300_BITOPS_H
3
4 /*
5 * Copyright 1992, Linus Torvalds.
6 * Copyright 2002, Yoshinori Sato
7 */
8
9 #include <linux/config.h>
10 #include <linux/compiler.h>
11 #include <asm/byteorder.h> /* swab32 */
12 #include <asm/system.h>
13
14 #ifdef __KERNEL__
15 /*
16 * Function prototypes to keep gcc -Wall happy
17 */
18
19 /*
20 * ffz = Find First Zero in word. Undefined if no zero exists,
21 * so code should check against ~0UL first..
22 */
23 static __inline__ unsigned long ffz(unsigned long word)
24 {
25 unsigned long result;
26
27 result = -1;
28 __asm__("1:\n\t"
29 "shlr.l %2\n\t"
30 "adds #1,%0\n\t"
31 "bcs 1b"
32 : "=r" (result)
33 : "0" (result),"r" (word));
34 return result;
35 }
36
37 #define H8300_GEN_BITOP_CONST(OP,BIT) \
38 case BIT: \
39 __asm__(OP " #" #BIT ",@%0"::"r"(b_addr):"memory"); \
40 break;
41
42 #define H8300_GEN_BITOP(FNAME,OP) \
43 static __inline__ void FNAME(int nr, volatile unsigned long* addr) \
44 { \
45 volatile unsigned char *b_addr; \
46 b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
47 if (__builtin_constant_p(nr)) { \
48 switch(nr & 7) { \
49 H8300_GEN_BITOP_CONST(OP,0) \
50 H8300_GEN_BITOP_CONST(OP,1) \
51 H8300_GEN_BITOP_CONST(OP,2) \
52 H8300_GEN_BITOP_CONST(OP,3) \
53 H8300_GEN_BITOP_CONST(OP,4) \
54 H8300_GEN_BITOP_CONST(OP,5) \
55 H8300_GEN_BITOP_CONST(OP,6) \
56 H8300_GEN_BITOP_CONST(OP,7) \
57 } \
58 } else { \
59 __asm__(OP " %w0,@%1"::"r"(nr),"r"(b_addr):"memory"); \
60 } \
61 }
62
63 /*
64 * clear_bit() doesn't provide any barrier for the compiler.
65 */
66 #define smp_mb__before_clear_bit() barrier()
67 #define smp_mb__after_clear_bit() barrier()
68
69 H8300_GEN_BITOP(set_bit ,"bset")
70 H8300_GEN_BITOP(clear_bit ,"bclr")
71 H8300_GEN_BITOP(change_bit,"bnot")
72 #define __set_bit(nr,addr) set_bit((nr),(addr))
73 #define __clear_bit(nr,addr) clear_bit((nr),(addr))
74 #define __change_bit(nr,addr) change_bit((nr),(addr))
75
76 #undef H8300_GEN_BITOP
77 #undef H8300_GEN_BITOP_CONST
78
79 static __inline__ int test_bit(int nr, const unsigned long* addr)
80 {
81 return (*((volatile unsigned char *)addr +
82 ((nr >> 3) ^ 3)) & (1UL << (nr & 7))) != 0;
83 }
84
85 #define __test_bit(nr, addr) test_bit(nr, addr)
86
87 #define H8300_GEN_TEST_BITOP_CONST_INT(OP,BIT) \
88 case BIT: \
89 __asm__("stc ccr,%w1\n\t" \
90 "orc #0x80,ccr\n\t" \
91 "bld #" #BIT ",@%4\n\t" \
92 OP " #" #BIT ",@%4\n\t" \
93 "rotxl.l %0\n\t" \
94 "ldc %w1,ccr" \
95 : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr) \
96 : "0" (retval),"r" (b_addr) \
97 : "memory"); \
98 break;
99
100 #define H8300_GEN_TEST_BITOP_CONST(OP,BIT) \
101 case BIT: \
102 __asm__("bld #" #BIT ",@%3\n\t" \
103 OP " #" #BIT ",@%3\n\t" \
104 "rotxl.l %0\n\t" \
105 : "=r"(retval),"=m"(*b_addr) \
106 : "0" (retval),"r" (b_addr) \
107 : "memory"); \
108 break;
109
110 #define H8300_GEN_TEST_BITOP(FNNAME,OP) \
111 static __inline__ int FNNAME(int nr, volatile void * addr) \
112 { \
113 int retval = 0; \
114 char ccrsave; \
115 volatile unsigned char *b_addr; \
116 b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
117 if (__builtin_constant_p(nr)) { \
118 switch(nr & 7) { \
119 H8300_GEN_TEST_BITOP_CONST_INT(OP,0) \
120 H8300_GEN_TEST_BITOP_CONST_INT(OP,1) \
121 H8300_GEN_TEST_BITOP_CONST_INT(OP,2) \
122 H8300_GEN_TEST_BITOP_CONST_INT(OP,3) \
123 H8300_GEN_TEST_BITOP_CONST_INT(OP,4) \
124 H8300_GEN_TEST_BITOP_CONST_INT(OP,5) \
125 H8300_GEN_TEST_BITOP_CONST_INT(OP,6) \
126 H8300_GEN_TEST_BITOP_CONST_INT(OP,7) \
127 } \
128 } else { \
129 __asm__("stc ccr,%w1\n\t" \
130 "orc #0x80,ccr\n\t" \
131 "btst %w5,@%4\n\t" \
132 OP " %w5,@%4\n\t" \
133 "beq 1f\n\t" \
134 "inc.l #1,%0\n" \
135 "1:\n\t" \
136 "ldc %w1,ccr" \
137 : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr) \
138 : "0" (retval),"r" (b_addr),"r"(nr) \
139 : "memory"); \
140 } \
141 return retval; \
142 } \
143 \
144 static __inline__ int __ ## FNNAME(int nr, volatile void * addr) \
145 { \
146 int retval = 0; \
147 volatile unsigned char *b_addr; \
148 b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3); \
149 if (__builtin_constant_p(nr)) { \
150 switch(nr & 7) { \
151 H8300_GEN_TEST_BITOP_CONST(OP,0) \
152 H8300_GEN_TEST_BITOP_CONST(OP,1) \
153 H8300_GEN_TEST_BITOP_CONST(OP,2) \
154 H8300_GEN_TEST_BITOP_CONST(OP,3) \
155 H8300_GEN_TEST_BITOP_CONST(OP,4) \
156 H8300_GEN_TEST_BITOP_CONST(OP,5) \
157 H8300_GEN_TEST_BITOP_CONST(OP,6) \
158 H8300_GEN_TEST_BITOP_CONST(OP,7) \
159 } \
160 } else { \
161 __asm__("btst %w4,@%3\n\t" \
162 OP " %w4,@%3\n\t" \
163 "beq 1f\n\t" \
164 "inc.l #1,%0\n" \
165 "1:" \
166 : "=r"(retval),"=m"(*b_addr) \
167 : "0" (retval),"r" (b_addr),"r"(nr) \
168 : "memory"); \
169 } \
170 return retval; \
171 }
172
173 H8300_GEN_TEST_BITOP(test_and_set_bit, "bset")
174 H8300_GEN_TEST_BITOP(test_and_clear_bit, "bclr")
175 H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
176 #undef H8300_GEN_TEST_BITOP_CONST
177 #undef H8300_GEN_TEST_BITOP_CONST_INT
178 #undef H8300_GEN_TEST_BITOP
179
180 #define find_first_zero_bit(addr, size) \
181 find_next_zero_bit((addr), (size), 0)
182
183 #define ffs(x) generic_ffs(x)
184
185 static __inline__ unsigned long __ffs(unsigned long word)
186 {
187 unsigned long result;
188
189 result = -1;
190 __asm__("1:\n\t"
191 "shlr.l %2\n\t"
192 "adds #1,%0\n\t"
193 "bcc 1b"
194 : "=r" (result)
195 : "0"(result),"r"(word));
196 return result;
197 }
198
199 static __inline__ int find_next_zero_bit (const unsigned long * addr, int size, int offset)
200 {
201 unsigned long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
202 unsigned long result = offset & ~31UL;
203 unsigned long tmp;
204
205 if (offset >= size)
206 return size;
207 size -= result;
208 offset &= 31UL;
209 if (offset) {
210 tmp = *(p++);
211 tmp |= ~0UL >> (32-offset);
212 if (size < 32)
213 goto found_first;
214 if (~tmp)
215 goto found_middle;
216 size -= 32;
217 result += 32;
218 }
219 while (size & ~31UL) {
220 if (~(tmp = *(p++)))
221 goto found_middle;
222 result += 32;
223 size -= 32;
224 }
225 if (!size)
226 return result;
227 tmp = *p;
228
229 found_first:
230 tmp |= ~0UL >> size;
231 found_middle:
232 return result + ffz(tmp);
233 }
234
235 static __inline__ unsigned long find_next_bit(const unsigned long *addr,
236 unsigned long size, unsigned long offset)
237 {
238 unsigned long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
239 unsigned int result = offset & ~31UL;
240 unsigned int tmp;
241
242 if (offset >= size)
243 return size;
244 size -= result;
245 offset &= 31UL;
246 if (offset) {
247 tmp = *(p++);
248 tmp &= ~0UL << offset;
249 if (size < 32)
250 goto found_first;
251 if (tmp)
252 goto found_middle;
253 size -= 32;
254 result += 32;
255 }
256 while (size >= 32) {
257 if ((tmp = *p++) != 0)
258 goto found_middle;
259 result += 32;
260 size -= 32;
261 }
262 if (!size)
263 return result;
264 tmp = *p;
265
266 found_first:
267 tmp &= ~0UL >> (32 - size);
268 if (tmp == 0UL)
269 return result + size;
270 found_middle:
271 return result + __ffs(tmp);
272 }
273
274 #define find_first_bit(addr, size) find_next_bit(addr, size, 0)
275
276 /*
277 * Every architecture must define this function. It's the fastest
278 * way of searching a 140-bit bitmap where the first 100 bits are
279 * unlikely to be set. It's guaranteed that at least one of the 140
280 * bits is cleared.
281 */
282 static inline int sched_find_first_bit(unsigned long *b)
283 {
284 if (unlikely(b[0]))
285 return __ffs(b[0]);
286 if (unlikely(b[1]))
287 return __ffs(b[1]) + 32;
288 if (unlikely(b[2]))
289 return __ffs(b[2]) + 64;
290 if (b[3])
291 return __ffs(b[3]) + 96;
292 return __ffs(b[4]) + 128;
293 }
294
295 /*
296 * hweightN: returns the hamming weight (i.e. the number
297 * of bits set) of a N-bit word
298 */
299
300 #define hweight32(x) generic_hweight32(x)
301 #define hweight16(x) generic_hweight16(x)
302 #define hweight8(x) generic_hweight8(x)
303
304 static __inline__ int ext2_set_bit(int nr, volatile void * addr)
305 {
306 int mask, retval;
307 unsigned long flags;
308 volatile unsigned char *ADDR = (unsigned char *) addr;
309
310 ADDR += nr >> 3;
311 mask = 1 << (nr & 0x07);
312 local_irq_save(flags);
313 retval = (mask & *ADDR) != 0;
314 *ADDR |= mask;
315 local_irq_restore(flags);
316 return retval;
317 }
318 #define ext2_set_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)
319
320 static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
321 {
322 int mask, retval;
323 unsigned long flags;
324 volatile unsigned char *ADDR = (unsigned char *) addr;
325
326 ADDR += nr >> 3;
327 mask = 1 << (nr & 0x07);
328 local_irq_save(flags);
329 retval = (mask & *ADDR) != 0;
330 *ADDR &= ~mask;
331 local_irq_restore(flags);
332 return retval;
333 }
334 #define ext2_clear_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)
335
336 static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
337 {
338 int mask;
339 const volatile unsigned char *ADDR = (const unsigned char *) addr;
340
341 ADDR += nr >> 3;
342 mask = 1 << (nr & 0x07);
343 return ((mask & *ADDR) != 0);
344 }
345
346 #define ext2_find_first_zero_bit(addr, size) \
347 ext2_find_next_zero_bit((addr), (size), 0)
348
349 static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
350 {
351 unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
352 unsigned long result = offset & ~31UL;
353 unsigned long tmp;
354
355 if (offset >= size)
356 return size;
357 size -= result;
358 offset &= 31UL;
359 if(offset) {
360 /* We hold the little endian value in tmp, but then the
361 * shift is illegal. So we could keep a big endian value
362 * in tmp, like this:
363 *
364 * tmp = __swab32(*(p++));
365 * tmp |= ~0UL >> (32-offset);
366 *
367 * but this would decrease performance, so we change the
368 * shift:
369 */
370 tmp = *(p++);
371 tmp |= __swab32(~0UL >> (32-offset));
372 if(size < 32)
373 goto found_first;
374 if(~tmp)
375 goto found_middle;
376 size -= 32;
377 result += 32;
378 }
379 while(size & ~31UL) {
380 if(~(tmp = *(p++)))
381 goto found_middle;
382 result += 32;
383 size -= 32;
384 }
385 if(!size)
386 return result;
387 tmp = *p;
388
389 found_first:
390 /* tmp is little endian, so we would have to swab the shift,
391 * see above. But then we have to swab tmp below for ffz, so
392 * we might as well do this here.
393 */
394 return result + ffz(__swab32(tmp) | (~0UL << size));
395 found_middle:
396 return result + ffz(__swab32(tmp));
397 }
398
399 /* Bitmap functions for the minix filesystem. */
400 #define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
401 #define minix_set_bit(nr,addr) set_bit(nr,addr)
402 #define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
403 #define minix_test_bit(nr,addr) test_bit(nr,addr)
404 #define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
405
406 #endif /* __KERNEL__ */
407
408 #define fls(x) generic_fls(x)
409
410 #endif /* _H8300_BITOPS_H */