Commit | Line | Data |
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9a8fd558 CZ |
1 | /* |
2 | * include/asm-xtensa/bitops.h | |
3 | * | |
4 | * Atomic operations that C can't guarantee us.Useful for resource counting etc. | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | * | |
ef6051a9 | 10 | * Copyright (C) 2001 - 2007 Tensilica Inc. |
9a8fd558 CZ |
11 | */ |
12 | ||
13 | #ifndef _XTENSA_BITOPS_H | |
14 | #define _XTENSA_BITOPS_H | |
15 | ||
16 | #ifdef __KERNEL__ | |
17 | ||
0624517d JS |
18 | #ifndef _LINUX_BITOPS_H |
19 | #error only <linux/bitops.h> can be included directly | |
20 | #endif | |
21 | ||
9a8fd558 CZ |
22 | #include <asm/processor.h> |
23 | #include <asm/byteorder.h> | |
24 | #include <asm/system.h> | |
25 | ||
26 | #ifdef CONFIG_SMP | |
27 | # error SMP not supported on this architecture | |
28 | #endif | |
29 | ||
9a8fd558 CZ |
30 | #define smp_mb__before_clear_bit() barrier() |
31 | #define smp_mb__after_clear_bit() barrier() | |
32 | ||
d4337aa5 AM |
33 | #include <asm-generic/bitops/atomic.h> |
34 | #include <asm-generic/bitops/non-atomic.h> | |
9a8fd558 | 35 | |
288a60cf | 36 | #if XCHAL_HAVE_NSA |
9a8fd558 | 37 | |
ef6051a9 | 38 | static inline unsigned long __cntlz (unsigned long x) |
9a8fd558 CZ |
39 | { |
40 | int lz; | |
41 | asm ("nsau %0, %1" : "=r" (lz) : "r" (x)); | |
ef6051a9 | 42 | return lz; |
9a8fd558 CZ |
43 | } |
44 | ||
9a8fd558 CZ |
45 | /* |
46 | * ffz: Find first zero in word. Undefined if no zero exists. | |
47 | * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). | |
48 | */ | |
49 | ||
ef6051a9 | 50 | static inline int ffz(unsigned long x) |
9a8fd558 | 51 | { |
ef6051a9 | 52 | return 31 - __cntlz(~x & -~x); |
9a8fd558 CZ |
53 | } |
54 | ||
55 | /* | |
56 | * __ffs: Find first bit set in word. Return 0 for bit 0 | |
57 | */ | |
58 | ||
ef6051a9 | 59 | static inline int __ffs(unsigned long x) |
9a8fd558 | 60 | { |
ef6051a9 | 61 | return 31 - __cntlz(x & -x); |
9a8fd558 CZ |
62 | } |
63 | ||
64 | /* | |
65 | * ffs: Find first bit set in word. This is defined the same way as | |
66 | * the libc and compiler builtin ffs routines, therefore | |
67 | * differs in spirit from the above ffz (man ffs). | |
68 | */ | |
69 | ||
ef6051a9 | 70 | static inline int ffs(unsigned long x) |
9a8fd558 | 71 | { |
ef6051a9 | 72 | return 32 - __cntlz(x & -x); |
9a8fd558 CZ |
73 | } |
74 | ||
75 | /* | |
76 | * fls: Find last (most-significant) bit set in word. | |
77 | * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. | |
78 | */ | |
79 | ||
ef6051a9 | 80 | static inline int fls (unsigned int x) |
9a8fd558 | 81 | { |
ef6051a9 | 82 | return 32 - __cntlz(x); |
9a8fd558 | 83 | } |
ef6051a9 CZ |
84 | |
85 | #else | |
86 | ||
87 | /* Use the generic implementation if we don't have the nsa/nsau instructions. */ | |
88 | ||
89 | # include <asm-generic/bitops/ffs.h> | |
90 | # include <asm-generic/bitops/__ffs.h> | |
91 | # include <asm-generic/bitops/ffz.h> | |
92 | # include <asm-generic/bitops/fls.h> | |
93 | ||
94 | #endif | |
95 | ||
d4337aa5 AM |
96 | #include <asm-generic/bitops/fls64.h> |
97 | #include <asm-generic/bitops/find.h> | |
98 | #include <asm-generic/bitops/ext2-non-atomic.h> | |
9a8fd558 CZ |
99 | |
100 | #ifdef __XTENSA_EL__ | |
de4f6e5b CZ |
101 | # define ext2_set_bit_atomic(lock,nr,addr) \ |
102 | test_and_set_bit((nr), (unsigned long*)(addr)) | |
103 | # define ext2_clear_bit_atomic(lock,nr,addr) \ | |
104 | test_and_clear_bit((nr), (unsigned long*)(addr)) | |
9a8fd558 | 105 | #elif defined(__XTENSA_EB__) |
de4f6e5b CZ |
106 | # define ext2_set_bit_atomic(lock,nr,addr) \ |
107 | test_and_set_bit((nr) ^ 0x18, (unsigned long*)(addr)) | |
108 | # define ext2_clear_bit_atomic(lock,nr,addr) \ | |
109 | test_and_clear_bit((nr) ^ 0x18, (unsigned long*)(addr)) | |
9a8fd558 CZ |
110 | #else |
111 | # error processor byte order undefined! | |
112 | #endif | |
113 | ||
d4337aa5 | 114 | #include <asm-generic/bitops/hweight.h> |
26333576 | 115 | #include <asm-generic/bitops/lock.h> |
d4337aa5 AM |
116 | #include <asm-generic/bitops/sched.h> |
117 | #include <asm-generic/bitops/minix.h> | |
9a8fd558 CZ |
118 | |
119 | #endif /* __KERNEL__ */ | |
120 | ||
121 | #endif /* _XTENSA_BITOPS_H */ |