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1/* bitops.h: bit operations for the Fujitsu FR-V CPUs
2 *
3 * For an explanation of how atomic ops work in this arch, see:
4 * Documentation/frv/atomic-ops.txt
5 *
6 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
7 * Written by David Howells (dhowells@redhat.com)
8 *
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.
13 */
14#ifndef _ASM_BITOPS_H
15#define _ASM_BITOPS_H
16
17#include <linux/compiler.h>
18#include <asm/byteorder.h>
19
20#ifdef __KERNEL__
21
22#ifndef _LINUX_BITOPS_H
23#error only <linux/bitops.h> can be included directly
24#endif
25
26#include <asm-generic/bitops/ffz.h>
27
28/*
29 * clear_bit() doesn't provide any barrier for the compiler.
30 */
31#define smp_mb__before_clear_bit() barrier()
32#define smp_mb__after_clear_bit() barrier()
33
34#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
35static inline
36unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v)
37{
38 unsigned long old, tmp;
39
40 asm volatile(
41 "0: \n"
42 " orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
43 " ckeq icc3,cc7 \n"
44 " ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
45 " orcr cc7,cc7,cc3 \n" /* set CC3 to true */
46 " and%I3 %1,%3,%2 \n"
47 " cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
48 " corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
49 " beq icc3,#0,0b \n"
50 : "+U"(*v), "=&r"(old), "=r"(tmp)
51 : "NPr"(~mask)
52 : "memory", "cc7", "cc3", "icc3"
53 );
54
55 return old;
56}
57
58static inline
59unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v)
60{
61 unsigned long old, tmp;
62
63 asm volatile(
64 "0: \n"
65 " orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
66 " ckeq icc3,cc7 \n"
67 " ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
68 " orcr cc7,cc7,cc3 \n" /* set CC3 to true */
69 " or%I3 %1,%3,%2 \n"
70 " cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
71 " corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
72 " beq icc3,#0,0b \n"
73 : "+U"(*v), "=&r"(old), "=r"(tmp)
74 : "NPr"(mask)
75 : "memory", "cc7", "cc3", "icc3"
76 );
77
78 return old;
79}
80
81static inline
82unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v)
83{
84 unsigned long old, tmp;
85
86 asm volatile(
87 "0: \n"
88 " orcc gr0,gr0,gr0,icc3 \n" /* set ICC3.Z */
89 " ckeq icc3,cc7 \n"
90 " ld.p %M0,%1 \n" /* LD.P/ORCR are atomic */
91 " orcr cc7,cc7,cc3 \n" /* set CC3 to true */
92 " xor%I3 %1,%3,%2 \n"
93 " cst.p %2,%M0 ,cc3,#1 \n" /* if store happens... */
94 " corcc gr29,gr29,gr0 ,cc3,#1 \n" /* ... clear ICC3.Z */
95 " beq icc3,#0,0b \n"
96 : "+U"(*v), "=&r"(old), "=r"(tmp)
97 : "NPr"(mask)
98 : "memory", "cc7", "cc3", "icc3"
99 );
100
101 return old;
102}
103
104#else
105
106extern unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v);
107extern unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v);
108extern unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v);
109
110#endif
111
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))
114
115static inline int test_and_clear_bit(int nr, volatile void *addr)
116{
117 volatile unsigned long *ptr = addr;
118 unsigned long mask = 1UL << (nr & 31);
119 ptr += nr >> 5;
120 return (atomic_test_and_ANDNOT_mask(mask, ptr) & mask) != 0;
121}
122
123static inline int test_and_set_bit(int nr, volatile void *addr)
124{
125 volatile unsigned long *ptr = addr;
126 unsigned long mask = 1UL << (nr & 31);
127 ptr += nr >> 5;
128 return (atomic_test_and_OR_mask(mask, ptr) & mask) != 0;
129}
130
131static inline int test_and_change_bit(int nr, volatile void *addr)
132{
133 volatile unsigned long *ptr = addr;
134 unsigned long mask = 1UL << (nr & 31);
135 ptr += nr >> 5;
136 return (atomic_test_and_XOR_mask(mask, ptr) & mask) != 0;
137}
138
139static inline void clear_bit(int nr, volatile void *addr)
140{
141 test_and_clear_bit(nr, addr);
142}
143
144static inline void set_bit(int nr, volatile void *addr)
145{
146 test_and_set_bit(nr, addr);
147}
148
149static inline void change_bit(int nr, volatile void * addr)
150{
151 test_and_change_bit(nr, addr);
152}
153
154static inline void __clear_bit(int nr, volatile void * addr)
155{
156 volatile unsigned long *a = addr;
157 int mask;
158
159 a += nr >> 5;
160 mask = 1 << (nr & 31);
161 *a &= ~mask;
162}
163
164static inline void __set_bit(int nr, volatile void * addr)
165{
166 volatile unsigned long *a = addr;
167 int mask;
168
169 a += nr >> 5;
170 mask = 1 << (nr & 31);
171 *a |= mask;
172}
173
174static inline void __change_bit(int nr, volatile void *addr)
175{
176 volatile unsigned long *a = addr;
177 int mask;
178
179 a += nr >> 5;
180 mask = 1 << (nr & 31);
181 *a ^= mask;
182}
183
184static inline int __test_and_clear_bit(int nr, volatile void * addr)
185{
186 volatile unsigned long *a = addr;
187 int mask, retval;
188
189 a += nr >> 5;
190 mask = 1 << (nr & 31);
191 retval = (mask & *a) != 0;
192 *a &= ~mask;
193 return retval;
194}
195
196static inline int __test_and_set_bit(int nr, volatile void * addr)
197{
198 volatile unsigned long *a = addr;
199 int mask, retval;
200
201 a += nr >> 5;
202 mask = 1 << (nr & 31);
203 retval = (mask & *a) != 0;
204 *a |= mask;
205 return retval;
206}
207
208static inline int __test_and_change_bit(int nr, volatile void * addr)
209{
210 volatile unsigned long *a = addr;
211 int mask, retval;
212
213 a += nr >> 5;
214 mask = 1 << (nr & 31);
215 retval = (mask & *a) != 0;
216 *a ^= mask;
217 return retval;
218}
219
220/*
221 * This routine doesn't need to be atomic.
222 */
223static inline int __constant_test_bit(int nr, const volatile void * addr)
224{
225 return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
226}
227
228static inline int __test_bit(int nr, const volatile void * addr)
229{
230 int * a = (int *) addr;
231 int mask;
232
233 a += nr >> 5;
234 mask = 1 << (nr & 0x1f);
235 return ((mask & *a) != 0);
236}
237
238#define test_bit(nr,addr) \
239(__builtin_constant_p(nr) ? \
240 __constant_test_bit((nr),(addr)) : \
241 __test_bit((nr),(addr)))
242
243#include <asm-generic/bitops/find.h>
244
245/**
246 * fls - find last bit set
247 * @x: the word to search
248 *
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
252 */
253#define fls(x) \
254({ \
255 int bit; \
256 \
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" \
262 : "=&r"(bit) \
263 : "r"(x), "r"(32) \
264 : "icc0", "cc4" \
265 ); \
266 \
267 bit; \
268})
269
270/**
271 * fls64 - find last bit set in a 64-bit value
272 * @n: the value to search
273 *
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
277 */
278static inline __attribute__((const))
279int fls64(u64 n)
280{
281 union {
282 u64 ll;
283 struct { u32 h, l; };
284 } _;
285 int bit, x, y;
286
287 _.ll = n;
288
289 asm(" subcc.p %3,gr0,gr0,icc0 \n"
290 " subcc %4,gr0,gr0,icc1 \n"
291 " ckne icc0,cc4 \n"
292 " ckne icc1,cc5 \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"
298 " setlos #64,%1 \n"
299 " cscan.p %4,gr0,%0 ,cc4,1 \n"
300 " setlos #32,%2 \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"
306 );
307 return bit;
308
309}
310
311/**
312 * ffs - find first bit set
313 * @x: the word to search
314 *
315 * - return 32..1 to indicate bit 31..0 most least significant bit set
316 * - return 0 to indicate no bits set
317 */
318static inline __attribute__((const))
319int ffs(int x)
320{
321 /* Note: (x & -x) gives us a mask that is the least significant
322 * (rightmost) 1-bit of the value in x.
323 */
324 return fls(x & -x);
325}
326
327/**
328 * __ffs - find first bit set
329 * @x: the word to search
330 *
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
333 */
334static inline __attribute__((const))
335int __ffs(unsigned long x)
336{
337 int bit;
338 asm("scan %1,gr0,%0" : "=r"(bit) : "r"(x & -x));
339 return 31 - bit;
340}
341
342/**
343 * __fls - find last (most-significant) set bit in a long word
344 * @word: the word to search
345 *
346 * Undefined if no set bit exists, so code should check against 0 first.
347 */
348static inline unsigned long __fls(unsigned long word)
349{
350 unsigned long bit;
351 asm("scan %1,gr0,%0" : "=r"(bit) : "r"(word));
352 return bit;
353}
354
355/*
356 * special slimline version of fls() for calculating ilog2_u32()
357 * - note: no protection against n == 0
358 */
359#define ARCH_HAS_ILOG2_U32
360static inline __attribute__((const))
361int __ilog2_u32(u32 n)
362{
363 int bit;
364 asm("scan %1,gr0,%0" : "=r"(bit) : "r"(n));
365 return 31 - bit;
366}
367
368/*
369 * special slimline version of fls64() for calculating ilog2_u64()
370 * - note: no protection against n == 0
371 */
372#define ARCH_HAS_ILOG2_U64
373static inline __attribute__((const))
374int __ilog2_u64(u64 n)
375{
376 union {
377 u64 ll;
378 struct { u32 h, l; };
379 } _;
380 int bit, x, y;
381
382 _.ll = n;
383
384 asm(" subcc %3,gr0,gr0,icc0 \n"
385 " ckeq icc0,cc4 \n"
386 " cscan.p %3,gr0,%0 ,cc4,0 \n"
387 " setlos #63,%1 \n"
388 " cscan.p %4,gr0,%0 ,cc4,1 \n"
389 " setlos #31,%2 \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)
394 : "icc0", "cc4"
395 );
396 return bit;
397}
398
399#include <asm-generic/bitops/sched.h>
400#include <asm-generic/bitops/hweight.h>
401#include <asm-generic/bitops/lock.h>
402
403#include <asm-generic/bitops/ext2-non-atomic.h>
404
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))
407
408#include <asm-generic/bitops/minix-le.h>
409
410#endif /* __KERNEL__ */
411
412#endif /* _ASM_BITOPS_H */
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