1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PARISC_BITOPS_H
3 #define _PARISC_BITOPS_H
5 #ifndef _LINUX_BITOPS_H
6 #error only <linux/bitops.h> can be included directly
9 #include <linux/compiler.h>
10 #include <asm/types.h>
11 #include <asm/byteorder.h>
12 #include <asm/barrier.h>
13 #include <linux/atomic.h>
15 /* See http://marc.theaimsgroup.com/?t=108826637900003 for discussion
16 * on use of volatile and __*_bit() (set/clear/change):
17 * *_bit() want use of volatile.
18 * __*_bit() are "relaxed" and don't use spinlock or volatile.
21 static __inline__ void set_bit(int nr, volatile unsigned long * addr)
23 unsigned long mask = BIT_MASK(nr);
27 _atomic_spin_lock_irqsave(addr, flags);
29 _atomic_spin_unlock_irqrestore(addr, flags);
32 static __inline__ void clear_bit(int nr, volatile unsigned long * addr)
34 unsigned long mask = BIT_MASK(nr);
38 _atomic_spin_lock_irqsave(addr, flags);
40 _atomic_spin_unlock_irqrestore(addr, flags);
43 static __inline__ void change_bit(int nr, volatile unsigned long * addr)
45 unsigned long mask = BIT_MASK(nr);
49 _atomic_spin_lock_irqsave(addr, flags);
51 _atomic_spin_unlock_irqrestore(addr, flags);
54 static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr)
56 unsigned long mask = BIT_MASK(nr);
62 _atomic_spin_lock_irqsave(addr, flags);
64 set = (old & mask) ? 1 : 0;
67 _atomic_spin_unlock_irqrestore(addr, flags);
72 static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)
74 unsigned long mask = BIT_MASK(nr);
80 _atomic_spin_lock_irqsave(addr, flags);
82 set = (old & mask) ? 1 : 0;
85 _atomic_spin_unlock_irqrestore(addr, flags);
90 static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr)
92 unsigned long mask = BIT_MASK(nr);
97 _atomic_spin_lock_irqsave(addr, flags);
99 *addr = oldbit ^ mask;
100 _atomic_spin_unlock_irqrestore(addr, flags);
102 return (oldbit & mask) ? 1 : 0;
105 #include <asm-generic/bitops/non-atomic.h>
108 * __ffs - find first bit in word. returns 0 to "BITS_PER_LONG-1".
109 * @word: The word to search
111 * __ffs() return is undefined if no bit is set.
113 * 32-bit fast __ffs by LaMont Jones "lamont At hp com".
114 * 64-bit enhancement by Grant Grundler "grundler At parisc-linux org".
115 * (with help from willy/jejb to get the semantics right)
117 * This algorithm avoids branches by making use of nullification.
118 * One side effect of "extr" instructions is it sets PSW[N] bit.
119 * How PSW[N] (nullify next insn) gets set is determined by the
120 * "condition" field (eg "<>" or "TR" below) in the extr* insn.
121 * Only the 1st and one of either the 2cd or 3rd insn will get executed.
122 * Each set of 3 insn will get executed in 2 cycles on PA8x00 vs 16 or so
123 * cycles for each mispredicted branch.
126 static __inline__ unsigned long __ffs(unsigned long x)
133 " extrd,u,*<> %0,63,32,%%r0\n"
134 " extrd,u,*TR %0,31,32,%0\n" /* move top 32-bits down */
139 " extru,<> %0,31,16,%%r0\n"
140 " extru,TR %0,15,16,%0\n" /* xxxx0000 -> 0000xxxx */
142 " extru,<> %0,31,8,%%r0\n"
143 " extru,TR %0,23,8,%0\n" /* 0000xx00 -> 000000xx */
145 " extru,<> %0,31,4,%%r0\n"
146 " extru,TR %0,27,4,%0\n" /* 000000x0 -> 0000000x */
148 " extru,<> %0,31,2,%%r0\n"
149 " extru,TR %0,29,2,%0\n" /* 0000000y, 1100b -> 0011b */
151 " extru,= %0,31,1,%%r0\n" /* check last bit */
153 : "+r" (x), "=r" (ret) );
157 #include <asm-generic/bitops/ffz.h>
160 * ffs: find first bit set. returns 1 to BITS_PER_LONG or 0 (if none set)
161 * This is defined the same way as the libc and compiler builtin
162 * ffs routines, therefore differs in spirit from the above ffz (man ffs).
164 static __inline__ int ffs(int x)
166 return x ? (__ffs((unsigned long)x) + 1) : 0;
170 * fls: find last (most significant) bit set.
171 * fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
174 static __inline__ int fls(unsigned int x)
182 " extru,<> %0,15,16,%%r0\n"
183 " zdep,TR %0,15,16,%0\n" /* xxxx0000 */
185 " extru,<> %0,7,8,%%r0\n"
186 " zdep,TR %0,23,24,%0\n" /* xx000000 */
188 " extru,<> %0,3,4,%%r0\n"
189 " zdep,TR %0,27,28,%0\n" /* x0000000 */
191 " extru,<> %0,1,2,%%r0\n"
192 " zdep,TR %0,29,30,%0\n" /* y0000000 (y&3 = 0) */
194 " extru,= %0,0,1,%%r0\n"
195 " addi 1,%1,%1\n" /* if y & 8, add 1 */
196 : "+r" (x), "=r" (ret) );
201 #include <asm-generic/bitops/__fls.h>
202 #include <asm-generic/bitops/fls64.h>
203 #include <asm-generic/bitops/hweight.h>
204 #include <asm-generic/bitops/lock.h>
205 #include <asm-generic/bitops/sched.h>
206 #include <asm-generic/bitops/le.h>
207 #include <asm-generic/bitops/ext2-atomic-setbit.h>
209 #endif /* _PARISC_BITOPS_H */