Commit | Line | Data |
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1da177e4 | 1 | /* |
746479cd | 2 | * Copyright IBM Corp. 1999,2013 |
1da177e4 | 3 | * |
746479cd HC |
4 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>, |
5 | * | |
6 | * The description below was taken in large parts from the powerpc | |
7 | * bitops header file: | |
8 | * Within a word, bits are numbered LSB first. Lot's of places make | |
9 | * this assumption by directly testing bits with (val & (1<<nr)). | |
10 | * This can cause confusion for large (> 1 word) bitmaps on a | |
11 | * big-endian system because, unlike little endian, the number of each | |
12 | * bit depends on the word size. | |
13 | * | |
48002bd5 HC |
14 | * The bitop functions are defined to work on unsigned longs, so the bits |
15 | * end up numbered: | |
db85eaeb | 16 | * |63..............0|127............64|191...........128|255...........192| |
746479cd HC |
17 | * |
18 | * There are a few little-endian macros used mostly for filesystem | |
48002bd5 | 19 | * bitmaps, these work on similar bit array layouts, but byte-oriented: |
746479cd HC |
20 | * |7...0|15...8|23...16|31...24|39...32|47...40|55...48|63...56| |
21 | * | |
48002bd5 HC |
22 | * The main difference is that bit 3-5 in the bit number field needs to be |
23 | * reversed compared to the big-endian bit fields. This can be achieved by | |
24 | * XOR with 0x38. | |
746479cd | 25 | * |
48002bd5 HC |
26 | * We also have special functions which work with an MSB0 encoding. |
27 | * The bits are numbered: | |
746479cd | 28 | * |0..............63|64............127|128...........191|192...........255| |
746479cd | 29 | * |
48002bd5 HC |
30 | * The main difference is that bit 0-63 in the bit number field needs to be |
31 | * reversed compared to the LSB0 encoded bit fields. This can be achieved by | |
32 | * XOR with 0x3f. | |
1da177e4 LT |
33 | * |
34 | */ | |
c406abd3 | 35 | |
a53c8fab HC |
36 | #ifndef _S390_BITOPS_H |
37 | #define _S390_BITOPS_H | |
38 | ||
0624517d JS |
39 | #ifndef _LINUX_BITOPS_H |
40 | #error only <linux/bitops.h> can be included directly | |
41 | #endif | |
42 | ||
370b0b5f | 43 | #include <linux/typecheck.h> |
1da177e4 | 44 | #include <linux/compiler.h> |
0ccc8b7a HC |
45 | #include <asm/barrier.h> |
46 | ||
47 | #define __BITOPS_NO_BARRIER "\n" | |
1da177e4 | 48 | |
e344e52c HC |
49 | #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES |
50 | ||
51 | #define __BITOPS_OR "laog" | |
52 | #define __BITOPS_AND "lang" | |
53 | #define __BITOPS_XOR "laxg" | |
0ccc8b7a | 54 | #define __BITOPS_BARRIER "bcr 14,0\n" |
e344e52c | 55 | |
0ccc8b7a | 56 | #define __BITOPS_LOOP(__addr, __val, __op_string, __barrier) \ |
e344e52c HC |
57 | ({ \ |
58 | unsigned long __old; \ | |
59 | \ | |
370b0b5f | 60 | typecheck(unsigned long *, (__addr)); \ |
e344e52c HC |
61 | asm volatile( \ |
62 | __op_string " %0,%2,%1\n" \ | |
0ccc8b7a | 63 | __barrier \ |
370b0b5f | 64 | : "=d" (__old), "+Q" (*(__addr)) \ |
e344e52c | 65 | : "d" (__val) \ |
0ccc8b7a | 66 | : "cc", "memory"); \ |
e344e52c HC |
67 | __old; \ |
68 | }) | |
69 | ||
70 | #else /* CONFIG_HAVE_MARCH_Z196_FEATURES */ | |
71 | ||
1da177e4 LT |
72 | #define __BITOPS_OR "ogr" |
73 | #define __BITOPS_AND "ngr" | |
74 | #define __BITOPS_XOR "xgr" | |
0ccc8b7a | 75 | #define __BITOPS_BARRIER "\n" |
1da177e4 | 76 | |
0ccc8b7a | 77 | #define __BITOPS_LOOP(__addr, __val, __op_string, __barrier) \ |
e344e52c HC |
78 | ({ \ |
79 | unsigned long __old, __new; \ | |
80 | \ | |
370b0b5f | 81 | typecheck(unsigned long *, (__addr)); \ |
94c12cc7 MS |
82 | asm volatile( \ |
83 | " lg %0,%2\n" \ | |
84 | "0: lgr %1,%0\n" \ | |
85 | __op_string " %1,%3\n" \ | |
86 | " csg %0,%1,%2\n" \ | |
87 | " jl 0b" \ | |
370b0b5f HC |
88 | : "=&d" (__old), "=&d" (__new), "+Q" (*(__addr))\ |
89 | : "d" (__val) \ | |
0ccc8b7a | 90 | : "cc", "memory"); \ |
e344e52c HC |
91 | __old; \ |
92 | }) | |
93 | ||
94 | #endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */ | |
94c12cc7 | 95 | |
01c2475f | 96 | #define __BITOPS_WORDS(bits) (((bits) + BITS_PER_LONG - 1) / BITS_PER_LONG) |
1da177e4 | 97 | |
370b0b5f HC |
98 | static inline unsigned long * |
99 | __bitops_word(unsigned long nr, volatile unsigned long *ptr) | |
100 | { | |
101 | unsigned long addr; | |
102 | ||
103 | addr = (unsigned long)ptr + ((nr ^ (nr & (BITS_PER_LONG - 1))) >> 3); | |
104 | return (unsigned long *)addr; | |
105 | } | |
106 | ||
107 | static inline unsigned char * | |
108 | __bitops_byte(unsigned long nr, volatile unsigned long *ptr) | |
109 | { | |
110 | return ((unsigned char *)ptr) + ((nr ^ (BITS_PER_LONG - 8)) >> 3); | |
111 | } | |
112 | ||
113 | static inline void set_bit(unsigned long nr, volatile unsigned long *ptr) | |
1da177e4 | 114 | { |
370b0b5f HC |
115 | unsigned long *addr = __bitops_word(nr, ptr); |
116 | unsigned long mask; | |
1da177e4 | 117 | |
4ae80325 HC |
118 | #ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES |
119 | if (__builtin_constant_p(nr)) { | |
120 | unsigned char *caddr = __bitops_byte(nr, ptr); | |
121 | ||
122 | asm volatile( | |
123 | "oi %0,%b1\n" | |
124 | : "+Q" (*caddr) | |
125 | : "i" (1 << (nr & 7)) | |
0ccc8b7a | 126 | : "cc", "memory"); |
4ae80325 HC |
127 | return; |
128 | } | |
129 | #endif | |
01c2475f | 130 | mask = 1UL << (nr & (BITS_PER_LONG - 1)); |
0ccc8b7a | 131 | __BITOPS_LOOP(addr, mask, __BITOPS_OR, __BITOPS_NO_BARRIER); |
1da177e4 LT |
132 | } |
133 | ||
370b0b5f | 134 | static inline void clear_bit(unsigned long nr, volatile unsigned long *ptr) |
1da177e4 | 135 | { |
370b0b5f HC |
136 | unsigned long *addr = __bitops_word(nr, ptr); |
137 | unsigned long mask; | |
1da177e4 | 138 | |
4ae80325 HC |
139 | #ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES |
140 | if (__builtin_constant_p(nr)) { | |
141 | unsigned char *caddr = __bitops_byte(nr, ptr); | |
142 | ||
143 | asm volatile( | |
144 | "ni %0,%b1\n" | |
145 | : "+Q" (*caddr) | |
146 | : "i" (~(1 << (nr & 7))) | |
0ccc8b7a | 147 | : "cc", "memory"); |
4ae80325 HC |
148 | return; |
149 | } | |
150 | #endif | |
01c2475f | 151 | mask = ~(1UL << (nr & (BITS_PER_LONG - 1))); |
0ccc8b7a | 152 | __BITOPS_LOOP(addr, mask, __BITOPS_AND, __BITOPS_NO_BARRIER); |
1da177e4 LT |
153 | } |
154 | ||
370b0b5f | 155 | static inline void change_bit(unsigned long nr, volatile unsigned long *ptr) |
1da177e4 | 156 | { |
370b0b5f HC |
157 | unsigned long *addr = __bitops_word(nr, ptr); |
158 | unsigned long mask; | |
1da177e4 | 159 | |
4ae80325 HC |
160 | #ifdef CONFIG_HAVE_MARCH_ZEC12_FEATURES |
161 | if (__builtin_constant_p(nr)) { | |
162 | unsigned char *caddr = __bitops_byte(nr, ptr); | |
163 | ||
164 | asm volatile( | |
165 | "xi %0,%b1\n" | |
166 | : "+Q" (*caddr) | |
167 | : "i" (1 << (nr & 7)) | |
0ccc8b7a | 168 | : "cc", "memory"); |
4ae80325 HC |
169 | return; |
170 | } | |
171 | #endif | |
01c2475f | 172 | mask = 1UL << (nr & (BITS_PER_LONG - 1)); |
0ccc8b7a | 173 | __BITOPS_LOOP(addr, mask, __BITOPS_XOR, __BITOPS_NO_BARRIER); |
1da177e4 LT |
174 | } |
175 | ||
1da177e4 | 176 | static inline int |
370b0b5f | 177 | test_and_set_bit(unsigned long nr, volatile unsigned long *ptr) |
1da177e4 | 178 | { |
370b0b5f HC |
179 | unsigned long *addr = __bitops_word(nr, ptr); |
180 | unsigned long old, mask; | |
1da177e4 | 181 | |
01c2475f | 182 | mask = 1UL << (nr & (BITS_PER_LONG - 1)); |
0ccc8b7a | 183 | old = __BITOPS_LOOP(addr, mask, __BITOPS_OR, __BITOPS_BARRIER); |
1da177e4 LT |
184 | return (old & mask) != 0; |
185 | } | |
186 | ||
1da177e4 | 187 | static inline int |
370b0b5f | 188 | test_and_clear_bit(unsigned long nr, volatile unsigned long *ptr) |
1da177e4 | 189 | { |
370b0b5f HC |
190 | unsigned long *addr = __bitops_word(nr, ptr); |
191 | unsigned long old, mask; | |
1da177e4 | 192 | |
01c2475f | 193 | mask = ~(1UL << (nr & (BITS_PER_LONG - 1))); |
0ccc8b7a | 194 | old = __BITOPS_LOOP(addr, mask, __BITOPS_AND, __BITOPS_BARRIER); |
e344e52c | 195 | return (old & ~mask) != 0; |
1da177e4 LT |
196 | } |
197 | ||
1da177e4 | 198 | static inline int |
370b0b5f | 199 | test_and_change_bit(unsigned long nr, volatile unsigned long *ptr) |
1da177e4 | 200 | { |
370b0b5f HC |
201 | unsigned long *addr = __bitops_word(nr, ptr); |
202 | unsigned long old, mask; | |
1da177e4 | 203 | |
01c2475f | 204 | mask = 1UL << (nr & (BITS_PER_LONG - 1)); |
0ccc8b7a | 205 | old = __BITOPS_LOOP(addr, mask, __BITOPS_XOR, __BITOPS_BARRIER); |
1da177e4 LT |
206 | return (old & mask) != 0; |
207 | } | |
1da177e4 | 208 | |
1da177e4 LT |
209 | static inline void __set_bit(unsigned long nr, volatile unsigned long *ptr) |
210 | { | |
370b0b5f | 211 | unsigned char *addr = __bitops_byte(nr, ptr); |
1da177e4 | 212 | |
370b0b5f | 213 | *addr |= 1 << (nr & 7); |
1da177e4 LT |
214 | } |
215 | ||
1da177e4 LT |
216 | static inline void |
217 | __clear_bit(unsigned long nr, volatile unsigned long *ptr) | |
218 | { | |
370b0b5f | 219 | unsigned char *addr = __bitops_byte(nr, ptr); |
1da177e4 | 220 | |
370b0b5f | 221 | *addr &= ~(1 << (nr & 7)); |
1da177e4 LT |
222 | } |
223 | ||
1da177e4 LT |
224 | static inline void __change_bit(unsigned long nr, volatile unsigned long *ptr) |
225 | { | |
370b0b5f | 226 | unsigned char *addr = __bitops_byte(nr, ptr); |
1da177e4 | 227 | |
370b0b5f | 228 | *addr ^= 1 << (nr & 7); |
1da177e4 LT |
229 | } |
230 | ||
1da177e4 | 231 | static inline int |
370b0b5f | 232 | __test_and_set_bit(unsigned long nr, volatile unsigned long *ptr) |
1da177e4 | 233 | { |
370b0b5f | 234 | unsigned char *addr = __bitops_byte(nr, ptr); |
1da177e4 LT |
235 | unsigned char ch; |
236 | ||
370b0b5f HC |
237 | ch = *addr; |
238 | *addr |= 1 << (nr & 7); | |
1da177e4 LT |
239 | return (ch >> (nr & 7)) & 1; |
240 | } | |
1da177e4 | 241 | |
1da177e4 | 242 | static inline int |
370b0b5f | 243 | __test_and_clear_bit(unsigned long nr, volatile unsigned long *ptr) |
1da177e4 | 244 | { |
370b0b5f | 245 | unsigned char *addr = __bitops_byte(nr, ptr); |
1da177e4 LT |
246 | unsigned char ch; |
247 | ||
370b0b5f HC |
248 | ch = *addr; |
249 | *addr &= ~(1 << (nr & 7)); | |
1da177e4 LT |
250 | return (ch >> (nr & 7)) & 1; |
251 | } | |
1da177e4 | 252 | |
1da177e4 | 253 | static inline int |
370b0b5f | 254 | __test_and_change_bit(unsigned long nr, volatile unsigned long *ptr) |
1da177e4 | 255 | { |
370b0b5f | 256 | unsigned char *addr = __bitops_byte(nr, ptr); |
1da177e4 LT |
257 | unsigned char ch; |
258 | ||
370b0b5f HC |
259 | ch = *addr; |
260 | *addr ^= 1 << (nr & 7); | |
1da177e4 LT |
261 | return (ch >> (nr & 7)) & 1; |
262 | } | |
1da177e4 | 263 | |
370b0b5f | 264 | static inline int test_bit(unsigned long nr, const volatile unsigned long *ptr) |
1da177e4 | 265 | { |
370b0b5f | 266 | const volatile unsigned char *addr; |
1da177e4 | 267 | |
370b0b5f HC |
268 | addr = ((const volatile unsigned char *)ptr); |
269 | addr += (nr ^ (BITS_PER_LONG - 8)) >> 3; | |
270 | return (*addr >> (nr & 7)) & 1; | |
1da177e4 LT |
271 | } |
272 | ||
acdc9fc9 MS |
273 | static inline int test_and_set_bit_lock(unsigned long nr, |
274 | volatile unsigned long *ptr) | |
275 | { | |
276 | if (test_bit(nr, ptr)) | |
277 | return 1; | |
278 | return test_and_set_bit(nr, ptr); | |
279 | } | |
280 | ||
281 | static inline void clear_bit_unlock(unsigned long nr, | |
282 | volatile unsigned long *ptr) | |
283 | { | |
284 | smp_mb__before_atomic(); | |
285 | clear_bit(nr, ptr); | |
286 | } | |
287 | ||
288 | static inline void __clear_bit_unlock(unsigned long nr, | |
289 | volatile unsigned long *ptr) | |
290 | { | |
291 | smp_mb(); | |
292 | __clear_bit(nr, ptr); | |
293 | } | |
294 | ||
afff7e2b | 295 | /* |
7d7c7b24 | 296 | * Functions which use MSB0 bit numbering. |
48002bd5 | 297 | * The bits are numbered: |
7d7c7b24 | 298 | * |0..............63|64............127|128...........191|192...........255| |
e56e4e87 | 299 | */ |
7d7c7b24 HC |
300 | unsigned long find_first_bit_inv(const unsigned long *addr, unsigned long size); |
301 | unsigned long find_next_bit_inv(const unsigned long *addr, unsigned long size, | |
302 | unsigned long offset); | |
303 | ||
304 | static inline void set_bit_inv(unsigned long nr, volatile unsigned long *ptr) | |
305 | { | |
306 | return set_bit(nr ^ (BITS_PER_LONG - 1), ptr); | |
307 | } | |
308 | ||
309 | static inline void clear_bit_inv(unsigned long nr, volatile unsigned long *ptr) | |
310 | { | |
311 | return clear_bit(nr ^ (BITS_PER_LONG - 1), ptr); | |
312 | } | |
313 | ||
314 | static inline void __set_bit_inv(unsigned long nr, volatile unsigned long *ptr) | |
315 | { | |
316 | return __set_bit(nr ^ (BITS_PER_LONG - 1), ptr); | |
317 | } | |
318 | ||
319 | static inline void __clear_bit_inv(unsigned long nr, volatile unsigned long *ptr) | |
320 | { | |
321 | return __clear_bit(nr ^ (BITS_PER_LONG - 1), ptr); | |
322 | } | |
323 | ||
324 | static inline int test_bit_inv(unsigned long nr, | |
325 | const volatile unsigned long *ptr) | |
326 | { | |
327 | return test_bit(nr ^ (BITS_PER_LONG - 1), ptr); | |
328 | } | |
e56e4e87 | 329 | |
b1cb7e2b HC |
330 | #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES |
331 | ||
332 | /** | |
333 | * __flogr - find leftmost one | |
334 | * @word - The word to search | |
335 | * | |
336 | * Returns the bit number of the most significant bit set, | |
337 | * where the most significant bit has bit number 0. | |
338 | * If no bit is set this function returns 64. | |
339 | */ | |
340 | static inline unsigned char __flogr(unsigned long word) | |
341 | { | |
342 | if (__builtin_constant_p(word)) { | |
343 | unsigned long bit = 0; | |
344 | ||
345 | if (!word) | |
346 | return 64; | |
347 | if (!(word & 0xffffffff00000000UL)) { | |
348 | word <<= 32; | |
349 | bit += 32; | |
350 | } | |
351 | if (!(word & 0xffff000000000000UL)) { | |
352 | word <<= 16; | |
353 | bit += 16; | |
354 | } | |
355 | if (!(word & 0xff00000000000000UL)) { | |
356 | word <<= 8; | |
357 | bit += 8; | |
358 | } | |
359 | if (!(word & 0xf000000000000000UL)) { | |
360 | word <<= 4; | |
361 | bit += 4; | |
362 | } | |
363 | if (!(word & 0xc000000000000000UL)) { | |
364 | word <<= 2; | |
365 | bit += 2; | |
366 | } | |
367 | if (!(word & 0x8000000000000000UL)) { | |
368 | word <<= 1; | |
369 | bit += 1; | |
370 | } | |
371 | return bit; | |
372 | } else { | |
373 | register unsigned long bit asm("4") = word; | |
374 | register unsigned long out asm("5"); | |
375 | ||
376 | asm volatile( | |
377 | " flogr %[bit],%[bit]\n" | |
378 | : [bit] "+d" (bit), [out] "=d" (out) : : "cc"); | |
379 | return bit; | |
380 | } | |
381 | } | |
382 | ||
383 | /** | |
384 | * __ffs - find first bit in word. | |
385 | * @word: The word to search | |
386 | * | |
387 | * Undefined if no bit exists, so code should check against 0 first. | |
388 | */ | |
389 | static inline unsigned long __ffs(unsigned long word) | |
390 | { | |
391 | return __flogr(-word & word) ^ (BITS_PER_LONG - 1); | |
392 | } | |
393 | ||
394 | /** | |
395 | * ffs - find first bit set | |
396 | * @word: the word to search | |
397 | * | |
398 | * This is defined the same way as the libc and | |
399 | * compiler builtin ffs routines (man ffs). | |
400 | */ | |
401 | static inline int ffs(int word) | |
402 | { | |
403 | unsigned long mask = 2 * BITS_PER_LONG - 1; | |
404 | unsigned int val = (unsigned int)word; | |
405 | ||
406 | return (1 + (__flogr(-val & val) ^ (BITS_PER_LONG - 1))) & mask; | |
407 | } | |
408 | ||
409 | /** | |
410 | * __fls - find last (most-significant) set bit in a long word | |
411 | * @word: the word to search | |
412 | * | |
413 | * Undefined if no set bit exists, so code should check against 0 first. | |
414 | */ | |
415 | static inline unsigned long __fls(unsigned long word) | |
416 | { | |
417 | return __flogr(word) ^ (BITS_PER_LONG - 1); | |
418 | } | |
419 | ||
420 | /** | |
421 | * fls64 - find last set bit in a 64-bit word | |
422 | * @word: the word to search | |
423 | * | |
424 | * This is defined in a similar way as the libc and compiler builtin | |
425 | * ffsll, but returns the position of the most significant set bit. | |
426 | * | |
427 | * fls64(value) returns 0 if value is 0 or the position of the last | |
428 | * set bit if value is nonzero. The last (most significant) bit is | |
429 | * at position 64. | |
430 | */ | |
431 | static inline int fls64(unsigned long word) | |
432 | { | |
433 | unsigned long mask = 2 * BITS_PER_LONG - 1; | |
434 | ||
435 | return (1 + (__flogr(word) ^ (BITS_PER_LONG - 1))) & mask; | |
436 | } | |
437 | ||
438 | /** | |
439 | * fls - find last (most-significant) bit set | |
440 | * @word: the word to search | |
441 | * | |
442 | * This is defined the same way as ffs. | |
443 | * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. | |
444 | */ | |
445 | static inline int fls(int word) | |
446 | { | |
447 | return fls64((unsigned int)word); | |
448 | } | |
449 | ||
450 | #else /* CONFIG_HAVE_MARCH_Z9_109_FEATURES */ | |
451 | ||
746479cd HC |
452 | #include <asm-generic/bitops/__ffs.h> |
453 | #include <asm-generic/bitops/ffs.h> | |
56a6b1eb | 454 | #include <asm-generic/bitops/__fls.h> |
746479cd | 455 | #include <asm-generic/bitops/fls.h> |
7e33db4e | 456 | #include <asm-generic/bitops/fls64.h> |
b1cb7e2b HC |
457 | |
458 | #endif /* CONFIG_HAVE_MARCH_Z9_109_FEATURES */ | |
459 | ||
746479cd HC |
460 | #include <asm-generic/bitops/ffz.h> |
461 | #include <asm-generic/bitops/find.h> | |
7e33db4e | 462 | #include <asm-generic/bitops/hweight.h> |
746479cd | 463 | #include <asm-generic/bitops/sched.h> |
802caabb | 464 | #include <asm-generic/bitops/le.h> |
148817ba | 465 | #include <asm-generic/bitops/ext2-atomic-setbit.h> |
67fe9251 | 466 | |
1da177e4 | 467 | #endif /* _S390_BITOPS_H */ |