1 /* bitops.h: bit operations for the Fujitsu FR-V CPUs
3 * For an explanation of how atomic ops work in this arch, see:
4 * Documentation/frv/atomic-ops.txt
6 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
7 * Written by David Howells (dhowells@redhat.com)
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
17 #include <linux/compiler.h>
18 #include <asm/byteorder.h>
22 #ifndef _LINUX_BITOPS_H
23 #error only <linux/bitops.h> can be included directly
26 #include <asm-generic/bitops/ffz.h>
29 * clear_bit() doesn't provide any barrier for the compiler.
31 #define smp_mb__before_clear_bit() barrier()
32 #define smp_mb__after_clear_bit() barrier()
34 #ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
36 unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v)
38 unsigned long old, tmp;
42 " orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
44 " ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
45 " orcr cc7,cc7,cc3 \n" /* set CC3 to true */
47 " cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
48 " corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
50 : "+U"(*v), "=&r"(old), "=r"(tmp)
52 : "memory", "cc7", "cc3", "icc3"
59 unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v)
61 unsigned long old, tmp;
65 " orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
67 " ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
68 " orcr cc7,cc7,cc3 \n" /* set CC3 to true */
70 " cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
71 " corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
73 : "+U"(*v), "=&r"(old), "=r"(tmp)
75 : "memory", "cc7", "cc3", "icc3"
82 unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v)
84 unsigned long old, tmp;
88 " orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
90 " ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
91 " orcr cc7,cc7,cc3 \n" /* set CC3 to true */
93 " cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
94 " corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
96 : "+U"(*v), "=&r"(old), "=r"(tmp)
98 : "memory", "cc7", "cc3", "icc3"
106 extern unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v);
107 extern unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v);
108 extern unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v);
112 #define atomic_clear_mask(mask, v) atomic_test_and_ANDNOT_mask((mask), (v))
113 #define atomic_set_mask(mask, v) atomic_test_and_OR_mask((mask), (v))
115 static inline int test_and_clear_bit(int nr, volatile void *addr)
117 volatile unsigned long *ptr = addr;
118 unsigned long mask = 1UL << (nr & 31);
120 return (atomic_test_and_ANDNOT_mask(mask, ptr) & mask) != 0;
123 static inline int test_and_set_bit(int nr, volatile void *addr)
125 volatile unsigned long *ptr = addr;
126 unsigned long mask = 1UL << (nr & 31);
128 return (atomic_test_and_OR_mask(mask, ptr) & mask) != 0;
131 static inline int test_and_change_bit(int nr, volatile void *addr)
133 volatile unsigned long *ptr = addr;
134 unsigned long mask = 1UL << (nr & 31);
136 return (atomic_test_and_XOR_mask(mask, ptr) & mask) != 0;
139 static inline void clear_bit(int nr, volatile void *addr)
141 test_and_clear_bit(nr, addr);
144 static inline void set_bit(int nr, volatile void *addr)
146 test_and_set_bit(nr, addr);
149 static inline void change_bit(int nr, volatile void * addr)
151 test_and_change_bit(nr, addr);
154 static inline void __clear_bit(int nr, volatile void * addr)
156 volatile unsigned long *a = addr;
160 mask = 1 << (nr & 31);
164 static inline void __set_bit(int nr, volatile void * addr)
166 volatile unsigned long *a = addr;
170 mask = 1 << (nr & 31);
174 static inline void __change_bit(int nr, volatile void *addr)
176 volatile unsigned long *a = addr;
180 mask = 1 << (nr & 31);
184 static inline int __test_and_clear_bit(int nr, volatile void * addr)
186 volatile unsigned long *a = addr;
190 mask = 1 << (nr & 31);
191 retval = (mask & *a) != 0;
196 static inline int __test_and_set_bit(int nr, volatile void * addr)
198 volatile unsigned long *a = addr;
202 mask = 1 << (nr & 31);
203 retval = (mask & *a) != 0;
208 static inline int __test_and_change_bit(int nr, volatile void * addr)
210 volatile unsigned long *a = addr;
214 mask = 1 << (nr & 31);
215 retval = (mask & *a) != 0;
221 * This routine doesn't need to be atomic.
223 static inline int __constant_test_bit(int nr, const volatile void * addr)
225 return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
228 static inline int __test_bit(int nr, const volatile void * addr)
230 int * a = (int *) addr;
234 mask = 1 << (nr & 0x1f);
235 return ((mask & *a) != 0);
238 #define test_bit(nr,addr) \
239 (__builtin_constant_p(nr) ? \
240 __constant_test_bit((nr),(addr)) : \
241 __test_bit((nr),(addr)))
243 #include <asm-generic/bitops/find.h>
246 * fls - find last bit set
247 * @x: the word to search
249 * This is defined the same way as ffs:
250 * - return 32..1 to indicate bit 31..0 most significant bit set
251 * - return 0 to indicate no bits set
257 asm(" subcc %1,gr0,gr0,icc0 \n" \
258 " ckne icc0,cc4 \n" \
259 " cscan.p %1,gr0,%0 ,cc4,#1 \n" \
260 " csub %0,%0,%0 ,cc4,#0 \n" \
261 " csub %2,%0,%0 ,cc4,#1 \n" \
271 * fls64 - find last bit set in a 64-bit value
272 * @n: the value to search
274 * This is defined the same way as ffs:
275 * - return 64..1 to indicate bit 63..0 most significant bit set
276 * - return 0 to indicate no bits set
278 static inline __attribute__((const))
283 struct { u32 h, l; };
289 asm(" subcc.p %3,gr0,gr0,icc0 \n"
290 " subcc %4,gr0,gr0,icc1 \n"
293 " norcr cc4,cc5,cc6 \n"
294 " csub.p %0,%0,%0 ,cc6,1 \n"
295 " orcr cc5,cc4,cc4 \n"
296 " andcr cc4,cc5,cc4 \n"
297 " cscan.p %3,gr0,%0 ,cc4,0 \n"
299 " cscan.p %4,gr0,%0 ,cc4,1 \n"
301 " csub.p %1,%0,%0 ,cc4,0 \n"
302 " csub %2,%0,%0 ,cc4,1 \n"
303 : "=&r"(bit), "=r"(x), "=r"(y)
304 : "0r"(_.h), "r"(_.l)
305 : "icc0", "icc1", "cc4", "cc5", "cc6"
312 * ffs - find first bit set
313 * @x: the word to search
315 * - return 32..1 to indicate bit 31..0 most least significant bit set
316 * - return 0 to indicate no bits set
318 static inline __attribute__((const))
321 /* Note: (x & -x) gives us a mask that is the least significant
322 * (rightmost) 1-bit of the value in x.
328 * __ffs - find first bit set
329 * @x: the word to search
331 * - return 31..0 to indicate bit 31..0 most least significant bit set
332 * - if no bits are set in x, the result is undefined
334 static inline __attribute__((const))
335 int __ffs(unsigned long x)
338 asm("scan %1,gr0,%0" : "=r"(bit) : "r"(x & -x));
343 * __fls - find last (most-significant) set bit in a long word
344 * @word: the word to search
346 * Undefined if no set bit exists, so code should check against 0 first.
348 static inline unsigned long __fls(unsigned long word)
351 asm("scan %1,gr0,%0" : "=r"(bit) : "r"(word));
356 * special slimline version of fls() for calculating ilog2_u32()
357 * - note: no protection against n == 0
359 #define ARCH_HAS_ILOG2_U32
360 static inline __attribute__((const))
361 int __ilog2_u32(u32 n)
364 asm("scan %1,gr0,%0" : "=r"(bit) : "r"(n));
369 * special slimline version of fls64() for calculating ilog2_u64()
370 * - note: no protection against n == 0
372 #define ARCH_HAS_ILOG2_U64
373 static inline __attribute__((const))
374 int __ilog2_u64(u64 n)
378 struct { u32 h, l; };
384 asm(" subcc %3,gr0,gr0,icc0 \n"
386 " cscan.p %3,gr0,%0 ,cc4,0 \n"
388 " cscan.p %4,gr0,%0 ,cc4,1 \n"
390 " csub.p %1,%0,%0 ,cc4,0 \n"
391 " csub %2,%0,%0 ,cc4,1 \n"
392 : "=&r"(bit), "=r"(x), "=r"(y)
393 : "0r"(_.h), "r"(_.l)
399 #include <asm-generic/bitops/sched.h>
400 #include <asm-generic/bitops/hweight.h>
401 #include <asm-generic/bitops/lock.h>
403 #include <asm-generic/bitops/ext2-non-atomic.h>
405 #define ext2_set_bit_atomic(lock,nr,addr) test_and_set_bit ((nr) ^ 0x18, (addr))
406 #define ext2_clear_bit_atomic(lock,nr,addr) test_and_clear_bit((nr) ^ 0x18, (addr))
408 #include <asm-generic/bitops/minix-le.h>
410 #endif /* __KERNEL__ */
412 #endif /* _ASM_BITOPS_H */