5 * include/asm-s390/bitops.h
8 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
9 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
11 * Derived from "include/asm-i386/bitops.h"
12 * Copyright (C) 1992, Linus Torvalds
18 #ifndef _LINUX_BITOPS_H
19 #error only <linux/bitops.h> can be included directly
22 #include <linux/compiler.h>
25 * 32 bit bitops format:
26 * bit 0 is the LSB of *addr; bit 31 is the MSB of *addr;
27 * bit 32 is the LSB of *(addr+4). That combined with the
28 * big endian byte order on S390 give the following bit
30 * 1f 1e 1d 1c 1b 1a 19 18 17 16 15 14 13 12 11 10 \
31 * 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
32 * after that follows the next long with bit numbers
33 * 3f 3e 3d 3c 3b 3a 39 38 37 36 35 34 33 32 31 30
34 * 2f 2e 2d 2c 2b 2a 29 28 27 26 25 24 23 22 21 20
35 * The reason for this bit ordering is the fact that
36 * in the architecture independent code bits operations
37 * of the form "flags |= (1 << bitnr)" are used INTERMIXED
38 * with operation of the form "set_bit(bitnr, flags)".
40 * 64 bit bitops format:
41 * bit 0 is the LSB of *addr; bit 63 is the MSB of *addr;
42 * bit 64 is the LSB of *(addr+8). That combined with the
43 * big endian byte order on S390 give the following bit
45 * 3f 3e 3d 3c 3b 3a 39 38 37 36 35 34 33 32 31 30
46 * 2f 2e 2d 2c 2b 2a 29 28 27 26 25 24 23 22 21 20
47 * 1f 1e 1d 1c 1b 1a 19 18 17 16 15 14 13 12 11 10
48 * 0f 0e 0d 0c 0b 0a 09 08 07 06 05 04 03 02 01 00
49 * after that follows the next long with bit numbers
50 * 7f 7e 7d 7c 7b 7a 79 78 77 76 75 74 73 72 71 70
51 * 6f 6e 6d 6c 6b 6a 69 68 67 66 65 64 63 62 61 60
52 * 5f 5e 5d 5c 5b 5a 59 58 57 56 55 54 53 52 51 50
53 * 4f 4e 4d 4c 4b 4a 49 48 47 46 45 44 43 42 41 40
54 * The reason for this bit ordering is the fact that
55 * in the architecture independent code bits operations
56 * of the form "flags |= (1 << bitnr)" are used INTERMIXED
57 * with operation of the form "set_bit(bitnr, flags)".
60 /* bitmap tables from arch/S390/kernel/bitmap.S */
61 extern const char _oi_bitmap[];
62 extern const char _ni_bitmap[];
63 extern const char _zb_findmap[];
64 extern const char _sb_findmap[];
68 #define __BITOPS_ALIGN 3
69 #define __BITOPS_WORDSIZE 32
70 #define __BITOPS_OR "or"
71 #define __BITOPS_AND "nr"
72 #define __BITOPS_XOR "xr"
74 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
76 #define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
80 __op_string " %1,%3\n" \
83 : "=&d" (__old), "=&d" (__new), \
84 "=Q" (*(unsigned long *) __addr) \
85 : "d" (__val), "Q" (*(unsigned long *) __addr) \
90 #define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
94 __op_string " %1,%3\n" \
97 : "=&d" (__old), "=&d" (__new), \
98 "=m" (*(unsigned long *) __addr) \
99 : "d" (__val), "a" (__addr), \
100 "m" (*(unsigned long *) __addr) : "cc");
102 #endif /* __GNUC__ */
104 #else /* __s390x__ */
106 #define __BITOPS_ALIGN 7
107 #define __BITOPS_WORDSIZE 64
108 #define __BITOPS_OR "ogr"
109 #define __BITOPS_AND "ngr"
110 #define __BITOPS_XOR "xgr"
112 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
114 #define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
118 __op_string " %1,%3\n" \
121 : "=&d" (__old), "=&d" (__new), \
122 "=Q" (*(unsigned long *) __addr) \
123 : "d" (__val), "Q" (*(unsigned long *) __addr) \
128 #define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
132 __op_string " %1,%3\n" \
133 " csg %0,%1,0(%4)\n" \
135 : "=&d" (__old), "=&d" (__new), \
136 "=m" (*(unsigned long *) __addr) \
137 : "d" (__val), "a" (__addr), \
138 "m" (*(unsigned long *) __addr) : "cc");
141 #endif /* __GNUC__ */
143 #endif /* __s390x__ */
145 #define __BITOPS_WORDS(bits) (((bits)+__BITOPS_WORDSIZE-1)/__BITOPS_WORDSIZE)
146 #define __BITOPS_BARRIER() asm volatile("" : : : "memory")
150 * SMP safe set_bit routine based on compare and swap (CS)
152 static inline void set_bit_cs(unsigned long nr, volatile unsigned long *ptr)
154 unsigned long addr, old, new, mask;
156 addr = (unsigned long) ptr;
157 /* calculate address for CS */
158 addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
160 mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
161 /* Do the atomic update. */
162 __BITOPS_LOOP(old, new, addr, mask, __BITOPS_OR);
166 * SMP safe clear_bit routine based on compare and swap (CS)
168 static inline void clear_bit_cs(unsigned long nr, volatile unsigned long *ptr)
170 unsigned long addr, old, new, mask;
172 addr = (unsigned long) ptr;
173 /* calculate address for CS */
174 addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
176 mask = ~(1UL << (nr & (__BITOPS_WORDSIZE - 1)));
177 /* Do the atomic update. */
178 __BITOPS_LOOP(old, new, addr, mask, __BITOPS_AND);
182 * SMP safe change_bit routine based on compare and swap (CS)
184 static inline void change_bit_cs(unsigned long nr, volatile unsigned long *ptr)
186 unsigned long addr, old, new, mask;
188 addr = (unsigned long) ptr;
189 /* calculate address for CS */
190 addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
192 mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
193 /* Do the atomic update. */
194 __BITOPS_LOOP(old, new, addr, mask, __BITOPS_XOR);
198 * SMP safe test_and_set_bit routine based on compare and swap (CS)
201 test_and_set_bit_cs(unsigned long nr, volatile unsigned long *ptr)
203 unsigned long addr, old, new, mask;
205 addr = (unsigned long) ptr;
206 /* calculate address for CS */
207 addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
208 /* make OR/test mask */
209 mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
210 /* Do the atomic update. */
211 __BITOPS_LOOP(old, new, addr, mask, __BITOPS_OR);
213 return (old & mask) != 0;
217 * SMP safe test_and_clear_bit routine based on compare and swap (CS)
220 test_and_clear_bit_cs(unsigned long nr, volatile unsigned long *ptr)
222 unsigned long addr, old, new, mask;
224 addr = (unsigned long) ptr;
225 /* calculate address for CS */
226 addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
227 /* make AND/test mask */
228 mask = ~(1UL << (nr & (__BITOPS_WORDSIZE - 1)));
229 /* Do the atomic update. */
230 __BITOPS_LOOP(old, new, addr, mask, __BITOPS_AND);
232 return (old ^ new) != 0;
236 * SMP safe test_and_change_bit routine based on compare and swap (CS)
239 test_and_change_bit_cs(unsigned long nr, volatile unsigned long *ptr)
241 unsigned long addr, old, new, mask;
243 addr = (unsigned long) ptr;
244 /* calculate address for CS */
245 addr += (nr ^ (nr & (__BITOPS_WORDSIZE - 1))) >> 3;
246 /* make XOR/test mask */
247 mask = 1UL << (nr & (__BITOPS_WORDSIZE - 1));
248 /* Do the atomic update. */
249 __BITOPS_LOOP(old, new, addr, mask, __BITOPS_XOR);
251 return (old & mask) != 0;
253 #endif /* CONFIG_SMP */
256 * fast, non-SMP set_bit routine
258 static inline void __set_bit(unsigned long nr, volatile unsigned long *ptr)
262 addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
265 : "=m" (*(char *) addr) : "a" (addr),
266 "a" (_oi_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc" );
270 __constant_set_bit(const unsigned long nr, volatile unsigned long *ptr)
274 addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
275 *(unsigned char *) addr |= 1 << (nr & 7);
278 #define set_bit_simple(nr,addr) \
279 (__builtin_constant_p((nr)) ? \
280 __constant_set_bit((nr),(addr)) : \
281 __set_bit((nr),(addr)) )
284 * fast, non-SMP clear_bit routine
287 __clear_bit(unsigned long nr, volatile unsigned long *ptr)
291 addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
294 : "=m" (*(char *) addr) : "a" (addr),
295 "a" (_ni_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc");
299 __constant_clear_bit(const unsigned long nr, volatile unsigned long *ptr)
303 addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
304 *(unsigned char *) addr &= ~(1 << (nr & 7));
307 #define clear_bit_simple(nr,addr) \
308 (__builtin_constant_p((nr)) ? \
309 __constant_clear_bit((nr),(addr)) : \
310 __clear_bit((nr),(addr)) )
313 * fast, non-SMP change_bit routine
315 static inline void __change_bit(unsigned long nr, volatile unsigned long *ptr)
319 addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
322 : "=m" (*(char *) addr) : "a" (addr),
323 "a" (_oi_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc" );
327 __constant_change_bit(const unsigned long nr, volatile unsigned long *ptr)
331 addr = ((unsigned long) ptr) + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
332 *(unsigned char *) addr ^= 1 << (nr & 7);
335 #define change_bit_simple(nr,addr) \
336 (__builtin_constant_p((nr)) ? \
337 __constant_change_bit((nr),(addr)) : \
338 __change_bit((nr),(addr)) )
341 * fast, non-SMP test_and_set_bit routine
344 test_and_set_bit_simple(unsigned long nr, volatile unsigned long *ptr)
349 addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
350 ch = *(unsigned char *) addr;
353 : "=m" (*(char *) addr)
354 : "a" (addr), "a" (_oi_bitmap + (nr & 7)),
355 "m" (*(char *) addr) : "cc", "memory");
356 return (ch >> (nr & 7)) & 1;
358 #define __test_and_set_bit(X,Y) test_and_set_bit_simple(X,Y)
361 * fast, non-SMP test_and_clear_bit routine
364 test_and_clear_bit_simple(unsigned long nr, volatile unsigned long *ptr)
369 addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
370 ch = *(unsigned char *) addr;
373 : "=m" (*(char *) addr)
374 : "a" (addr), "a" (_ni_bitmap + (nr & 7)),
375 "m" (*(char *) addr) : "cc", "memory");
376 return (ch >> (nr & 7)) & 1;
378 #define __test_and_clear_bit(X,Y) test_and_clear_bit_simple(X,Y)
381 * fast, non-SMP test_and_change_bit routine
384 test_and_change_bit_simple(unsigned long nr, volatile unsigned long *ptr)
389 addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
390 ch = *(unsigned char *) addr;
393 : "=m" (*(char *) addr)
394 : "a" (addr), "a" (_oi_bitmap + (nr & 7)),
395 "m" (*(char *) addr) : "cc", "memory");
396 return (ch >> (nr & 7)) & 1;
398 #define __test_and_change_bit(X,Y) test_and_change_bit_simple(X,Y)
401 #define set_bit set_bit_cs
402 #define clear_bit clear_bit_cs
403 #define change_bit change_bit_cs
404 #define test_and_set_bit test_and_set_bit_cs
405 #define test_and_clear_bit test_and_clear_bit_cs
406 #define test_and_change_bit test_and_change_bit_cs
408 #define set_bit set_bit_simple
409 #define clear_bit clear_bit_simple
410 #define change_bit change_bit_simple
411 #define test_and_set_bit test_and_set_bit_simple
412 #define test_and_clear_bit test_and_clear_bit_simple
413 #define test_and_change_bit test_and_change_bit_simple
418 * This routine doesn't need to be atomic.
421 static inline int __test_bit(unsigned long nr, const volatile unsigned long *ptr)
426 addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
427 ch = *(volatile unsigned char *) addr;
428 return (ch >> (nr & 7)) & 1;
432 __constant_test_bit(unsigned long nr, const volatile unsigned long *addr) {
433 return (((volatile char *) addr)
434 [(nr^(__BITOPS_WORDSIZE-8))>>3] & (1<<(nr&7))) != 0;
437 #define test_bit(nr,addr) \
438 (__builtin_constant_p((nr)) ? \
439 __constant_test_bit((nr),(addr)) : \
440 __test_bit((nr),(addr)) )
443 * ffz = Find First Zero in word. Undefined if no zero exists,
444 * so code should check against ~0UL first..
446 static inline unsigned long ffz(unsigned long word)
448 unsigned long bit = 0;
451 if (likely((word & 0xffffffff) == 0xffffffff)) {
456 if (likely((word & 0xffff) == 0xffff)) {
460 if (likely((word & 0xff) == 0xff)) {
464 return bit + _zb_findmap[word & 0xff];
468 * __ffs = find first bit in word. Undefined if no bit exists,
469 * so code should check against 0UL first..
471 static inline unsigned long __ffs (unsigned long word)
473 unsigned long bit = 0;
476 if (likely((word & 0xffffffff) == 0)) {
481 if (likely((word & 0xffff) == 0)) {
485 if (likely((word & 0xff) == 0)) {
489 return bit + _sb_findmap[word & 0xff];
493 * Find-bit routines..
499 find_first_zero_bit(const unsigned long * addr, unsigned long size)
501 typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
502 unsigned long cmp, count;
534 : "=&a" (res), "=&d" (cmp), "=&a" (count)
535 : "a" (size), "a" (addr), "a" (&_zb_findmap),
536 "m" (*(addrtype *) addr) : "cc");
537 return (res < size) ? res : size;
541 find_first_bit(const unsigned long * addr, unsigned long size)
543 typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
544 unsigned long cmp, count;
576 : "=&a" (res), "=&d" (cmp), "=&a" (count)
577 : "a" (size), "a" (addr), "a" (&_sb_findmap),
578 "m" (*(addrtype *) addr) : "cc");
579 return (res < size) ? res : size;
582 #else /* __s390x__ */
584 static inline unsigned long
585 find_first_zero_bit(const unsigned long * addr, unsigned long size)
587 typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
588 unsigned long res, cmp, count;
598 "0: cg %1,0(%0,%4)\n"
604 "1: lg %2,0(%0,%4)\n"
615 "3: tmll %2,0x00ff\n"
623 : "=&a" (res), "=&d" (cmp), "=&a" (count)
624 : "a" (size), "a" (addr), "a" (&_zb_findmap),
625 "m" (*(addrtype *) addr) : "cc");
626 return (res < size) ? res : size;
629 static inline unsigned long
630 find_first_bit(const unsigned long * addr, unsigned long size)
632 typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
633 unsigned long res, cmp, count;
643 "0: cg %1,0(%0,%4)\n"
649 "1: lg %2,0(%0,%4)\n"
660 "3: tmll %2,0x00ff\n"
668 : "=&a" (res), "=&d" (cmp), "=&a" (count)
669 : "a" (size), "a" (addr), "a" (&_sb_findmap),
670 "m" (*(addrtype *) addr) : "cc");
671 return (res < size) ? res : size;
674 #endif /* __s390x__ */
677 find_next_zero_bit (const unsigned long * addr, unsigned long size,
678 unsigned long offset)
680 const unsigned long *p;
681 unsigned long bit, set;
685 bit = offset & (__BITOPS_WORDSIZE - 1);
688 p = addr + offset / __BITOPS_WORDSIZE;
691 * s390 version of ffz returns __BITOPS_WORDSIZE
692 * if no zero bit is present in the word.
694 set = ffz(*p >> bit) + bit;
696 return size + offset;
697 if (set < __BITOPS_WORDSIZE)
699 offset += __BITOPS_WORDSIZE;
700 size -= __BITOPS_WORDSIZE;
703 return offset + find_first_zero_bit(p, size);
707 find_next_bit (const unsigned long * addr, unsigned long size,
708 unsigned long offset)
710 const unsigned long *p;
711 unsigned long bit, set;
715 bit = offset & (__BITOPS_WORDSIZE - 1);
718 p = addr + offset / __BITOPS_WORDSIZE;
721 * s390 version of __ffs returns __BITOPS_WORDSIZE
722 * if no one bit is present in the word.
724 set = __ffs(*p & (~0UL << bit));
726 return size + offset;
727 if (set < __BITOPS_WORDSIZE)
729 offset += __BITOPS_WORDSIZE;
730 size -= __BITOPS_WORDSIZE;
733 return offset + find_first_bit(p, size);
737 * Every architecture must define this function. It's the fastest
738 * way of searching a 140-bit bitmap where the first 100 bits are
739 * unlikely to be set. It's guaranteed that at least one of the 140
742 static inline int sched_find_first_bit(unsigned long *b)
744 return find_first_bit(b, 140);
747 #include <asm-generic/bitops/ffs.h>
749 #include <asm-generic/bitops/fls.h>
750 #include <asm-generic/bitops/fls64.h>
752 #include <asm-generic/bitops/hweight.h>
753 #include <asm-generic/bitops/lock.h>
756 * ATTENTION: intel byte ordering convention for ext2 and minix !!
757 * bit 0 is the LSB of addr; bit 31 is the MSB of addr;
758 * bit 32 is the LSB of (addr+4).
759 * That combined with the little endian byte order of Intel gives the
760 * following bit order in memory:
761 * 07 06 05 04 03 02 01 00 15 14 13 12 11 10 09 08 \
762 * 23 22 21 20 19 18 17 16 31 30 29 28 27 26 25 24
765 #define ext2_set_bit(nr, addr) \
766 __test_and_set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
767 #define ext2_set_bit_atomic(lock, nr, addr) \
768 test_and_set_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
769 #define ext2_clear_bit(nr, addr) \
770 __test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
771 #define ext2_clear_bit_atomic(lock, nr, addr) \
772 test_and_clear_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
773 #define ext2_test_bit(nr, addr) \
774 test_bit((nr)^(__BITOPS_WORDSIZE - 8), (unsigned long *)addr)
779 ext2_find_first_zero_bit(void *vaddr, unsigned int size)
781 typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
782 unsigned long cmp, count;
793 "0: cl %1,0(%0,%4)\n"
815 : "=&a" (res), "=&d" (cmp), "=&a" (count)
816 : "a" (size), "a" (vaddr), "a" (&_zb_findmap),
817 "m" (*(addrtype *) vaddr) : "cc");
818 return (res < size) ? res : size;
821 #else /* __s390x__ */
823 static inline unsigned long
824 ext2_find_first_zero_bit(void *vaddr, unsigned long size)
826 typedef struct { long _[__BITOPS_WORDS(size)]; } addrtype;
827 unsigned long res, cmp, count;
837 "0: clg %1,0(%0,%4)\n"
843 "1: cl %1,0(%0,%4)\n"
854 "3: tmll %2,0xff00\n"
862 : "=&a" (res), "=&d" (cmp), "=&a" (count)
863 : "a" (size), "a" (vaddr), "a" (&_zb_findmap),
864 "m" (*(addrtype *) vaddr) : "cc");
865 return (res < size) ? res : size;
868 #endif /* __s390x__ */
871 ext2_find_next_zero_bit(void *vaddr, unsigned long size, unsigned long offset)
873 unsigned long *addr = vaddr, *p;
874 unsigned long word, bit, set;
878 bit = offset & (__BITOPS_WORDSIZE - 1);
881 p = addr + offset / __BITOPS_WORDSIZE;
889 : "=&a" (word) : "a" (p), "m" (*p) : "cc");
893 : "=a" (word) : "m" (*p) );
896 * s390 version of ffz returns __BITOPS_WORDSIZE
897 * if no zero bit is present in the word.
899 set = ffz(word >> bit) + bit;
901 return size + offset;
902 if (set < __BITOPS_WORDSIZE)
904 offset += __BITOPS_WORDSIZE;
905 size -= __BITOPS_WORDSIZE;
908 return offset + ext2_find_first_zero_bit(p, size);
911 #include <asm-generic/bitops/minix.h>
913 #endif /* __KERNEL__ */
915 #endif /* _S390_BITOPS_H */