Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _PARISC_BITOPS_H |
| 2 | #define _PARISC_BITOPS_H |
| 3 | |
Jiri Slaby | 0624517 | 2007-10-18 23:40:26 -0700 | [diff] [blame] | 4 | #ifndef _LINUX_BITOPS_H |
| 5 | #error only <linux/bitops.h> can be included directly |
| 6 | #endif |
| 7 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/compiler.h> |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 9 | #include <asm/types.h> /* for BITS_PER_LONG/SHIFT_PER_LONG */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <asm/byteorder.h> |
| 11 | #include <asm/atomic.h> |
| 12 | |
| 13 | /* |
| 14 | * HP-PARISC specific bit operations |
| 15 | * for a detailed description of the functions please refer |
| 16 | * to include/asm-i386/bitops.h or kerneldoc |
| 17 | */ |
| 18 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 19 | #define CHOP_SHIFTCOUNT(x) (((unsigned long) (x)) & (BITS_PER_LONG - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | |
| 22 | #define smp_mb__before_clear_bit() smp_mb() |
| 23 | #define smp_mb__after_clear_bit() smp_mb() |
| 24 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 25 | /* See http://marc.theaimsgroup.com/?t=108826637900003 for discussion |
| 26 | * on use of volatile and __*_bit() (set/clear/change): |
| 27 | * *_bit() want use of volatile. |
| 28 | * __*_bit() are "relaxed" and don't use spinlock or volatile. |
| 29 | */ |
| 30 | |
| 31 | static __inline__ void set_bit(int nr, volatile unsigned long * addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | { |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 33 | unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | unsigned long flags; |
| 35 | |
| 36 | addr += (nr >> SHIFT_PER_LONG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | _atomic_spin_lock_irqsave(addr, flags); |
| 38 | *addr |= mask; |
| 39 | _atomic_spin_unlock_irqrestore(addr, flags); |
| 40 | } |
| 41 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 42 | static __inline__ void clear_bit(int nr, volatile unsigned long * addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | { |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 44 | unsigned long mask = ~(1UL << CHOP_SHIFTCOUNT(nr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | unsigned long flags; |
| 46 | |
| 47 | addr += (nr >> SHIFT_PER_LONG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | _atomic_spin_lock_irqsave(addr, flags); |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 49 | *addr &= mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | _atomic_spin_unlock_irqrestore(addr, flags); |
| 51 | } |
| 52 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 53 | static __inline__ void change_bit(int nr, volatile unsigned long * addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 55 | unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | unsigned long flags; |
| 57 | |
| 58 | addr += (nr >> SHIFT_PER_LONG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | _atomic_spin_lock_irqsave(addr, flags); |
| 60 | *addr ^= mask; |
| 61 | _atomic_spin_unlock_irqrestore(addr, flags); |
| 62 | } |
| 63 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 64 | static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | { |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 66 | unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); |
Matthew Wilcox | af5917f | 2006-12-14 09:00:25 -0700 | [diff] [blame] | 67 | unsigned long old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | unsigned long flags; |
Matthew Wilcox | af5917f | 2006-12-14 09:00:25 -0700 | [diff] [blame] | 69 | int set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
| 71 | addr += (nr >> SHIFT_PER_LONG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | _atomic_spin_lock_irqsave(addr, flags); |
Matthew Wilcox | af5917f | 2006-12-14 09:00:25 -0700 | [diff] [blame] | 73 | old = *addr; |
| 74 | set = (old & mask) ? 1 : 0; |
| 75 | if (!set) |
| 76 | *addr = old | mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | _atomic_spin_unlock_irqrestore(addr, flags); |
| 78 | |
Matthew Wilcox | af5917f | 2006-12-14 09:00:25 -0700 | [diff] [blame] | 79 | return set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | } |
| 81 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 82 | static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | { |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 84 | unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); |
Matthew Wilcox | af5917f | 2006-12-14 09:00:25 -0700 | [diff] [blame] | 85 | unsigned long old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | unsigned long flags; |
Matthew Wilcox | af5917f | 2006-12-14 09:00:25 -0700 | [diff] [blame] | 87 | int set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | addr += (nr >> SHIFT_PER_LONG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | _atomic_spin_lock_irqsave(addr, flags); |
Matthew Wilcox | af5917f | 2006-12-14 09:00:25 -0700 | [diff] [blame] | 91 | old = *addr; |
| 92 | set = (old & mask) ? 1 : 0; |
| 93 | if (set) |
| 94 | *addr = old & ~mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | _atomic_spin_unlock_irqrestore(addr, flags); |
| 96 | |
Matthew Wilcox | af5917f | 2006-12-14 09:00:25 -0700 | [diff] [blame] | 97 | return set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 100 | static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | { |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 102 | unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr); |
| 103 | unsigned long oldbit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | unsigned long flags; |
| 105 | |
| 106 | addr += (nr >> SHIFT_PER_LONG); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | _atomic_spin_lock_irqsave(addr, flags); |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 108 | oldbit = *addr; |
| 109 | *addr = oldbit ^ mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | _atomic_spin_unlock_irqrestore(addr, flags); |
| 111 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 112 | return (oldbit & mask) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | |
Akinobu Mita | 59e18a2 | 2006-03-26 01:39:31 -0800 | [diff] [blame] | 115 | #include <asm-generic/bitops/non-atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
| 117 | #ifdef __KERNEL__ |
| 118 | |
| 119 | /** |
| 120 | * __ffs - find first bit in word. returns 0 to "BITS_PER_LONG-1". |
| 121 | * @word: The word to search |
| 122 | * |
| 123 | * __ffs() return is undefined if no bit is set. |
| 124 | * |
| 125 | * 32-bit fast __ffs by LaMont Jones "lamont At hp com". |
| 126 | * 64-bit enhancement by Grant Grundler "grundler At parisc-linux org". |
| 127 | * (with help from willy/jejb to get the semantics right) |
| 128 | * |
| 129 | * This algorithm avoids branches by making use of nullification. |
| 130 | * One side effect of "extr" instructions is it sets PSW[N] bit. |
| 131 | * How PSW[N] (nullify next insn) gets set is determined by the |
| 132 | * "condition" field (eg "<>" or "TR" below) in the extr* insn. |
| 133 | * Only the 1st and one of either the 2cd or 3rd insn will get executed. |
| 134 | * Each set of 3 insn will get executed in 2 cycles on PA8x00 vs 16 or so |
| 135 | * cycles for each mispredicted branch. |
| 136 | */ |
| 137 | |
| 138 | static __inline__ unsigned long __ffs(unsigned long x) |
| 139 | { |
| 140 | unsigned long ret; |
| 141 | |
| 142 | __asm__( |
Helge Deller | 513e7ec | 2007-01-28 15:09:20 +0100 | [diff] [blame] | 143 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | " ldi 63,%1\n" |
| 145 | " extrd,u,*<> %0,63,32,%%r0\n" |
| 146 | " extrd,u,*TR %0,31,32,%0\n" /* move top 32-bits down */ |
| 147 | " addi -32,%1,%1\n" |
| 148 | #else |
| 149 | " ldi 31,%1\n" |
| 150 | #endif |
| 151 | " extru,<> %0,31,16,%%r0\n" |
| 152 | " extru,TR %0,15,16,%0\n" /* xxxx0000 -> 0000xxxx */ |
| 153 | " addi -16,%1,%1\n" |
| 154 | " extru,<> %0,31,8,%%r0\n" |
| 155 | " extru,TR %0,23,8,%0\n" /* 0000xx00 -> 000000xx */ |
| 156 | " addi -8,%1,%1\n" |
| 157 | " extru,<> %0,31,4,%%r0\n" |
| 158 | " extru,TR %0,27,4,%0\n" /* 000000x0 -> 0000000x */ |
| 159 | " addi -4,%1,%1\n" |
| 160 | " extru,<> %0,31,2,%%r0\n" |
| 161 | " extru,TR %0,29,2,%0\n" /* 0000000y, 1100b -> 0011b */ |
| 162 | " addi -2,%1,%1\n" |
| 163 | " extru,= %0,31,1,%%r0\n" /* check last bit */ |
| 164 | " addi -1,%1,%1\n" |
| 165 | : "+r" (x), "=r" (ret) ); |
| 166 | return ret; |
| 167 | } |
| 168 | |
Akinobu Mita | 59e18a2 | 2006-03-26 01:39:31 -0800 | [diff] [blame] | 169 | #include <asm-generic/bitops/ffz.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | |
| 171 | /* |
| 172 | * ffs: find first bit set. returns 1 to BITS_PER_LONG or 0 (if none set) |
| 173 | * This is defined the same way as the libc and compiler builtin |
| 174 | * ffs routines, therefore differs in spirit from the above ffz (man ffs). |
| 175 | */ |
| 176 | static __inline__ int ffs(int x) |
| 177 | { |
| 178 | return x ? (__ffs((unsigned long)x) + 1) : 0; |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * fls: find last (most significant) bit set. |
| 183 | * fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. |
| 184 | */ |
| 185 | |
| 186 | static __inline__ int fls(int x) |
| 187 | { |
| 188 | int ret; |
| 189 | if (!x) |
| 190 | return 0; |
| 191 | |
| 192 | __asm__( |
| 193 | " ldi 1,%1\n" |
| 194 | " extru,<> %0,15,16,%%r0\n" |
| 195 | " zdep,TR %0,15,16,%0\n" /* xxxx0000 */ |
| 196 | " addi 16,%1,%1\n" |
| 197 | " extru,<> %0,7,8,%%r0\n" |
| 198 | " zdep,TR %0,23,24,%0\n" /* xx000000 */ |
| 199 | " addi 8,%1,%1\n" |
| 200 | " extru,<> %0,3,4,%%r0\n" |
| 201 | " zdep,TR %0,27,28,%0\n" /* x0000000 */ |
| 202 | " addi 4,%1,%1\n" |
| 203 | " extru,<> %0,1,2,%%r0\n" |
| 204 | " zdep,TR %0,29,30,%0\n" /* y0000000 (y&3 = 0) */ |
| 205 | " addi 2,%1,%1\n" |
| 206 | " extru,= %0,0,1,%%r0\n" |
| 207 | " addi 1,%1,%1\n" /* if y & 8, add 1 */ |
| 208 | : "+r" (x), "=r" (ret) ); |
| 209 | |
| 210 | return ret; |
| 211 | } |
| 212 | |
Akinobu Mita | 59e18a2 | 2006-03-26 01:39:31 -0800 | [diff] [blame] | 213 | #include <asm-generic/bitops/fls64.h> |
| 214 | #include <asm-generic/bitops/hweight.h> |
Nick Piggin | 2633357 | 2007-10-18 03:06:39 -0700 | [diff] [blame] | 215 | #include <asm-generic/bitops/lock.h> |
Akinobu Mita | 59e18a2 | 2006-03-26 01:39:31 -0800 | [diff] [blame] | 216 | #include <asm-generic/bitops/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
| 218 | #endif /* __KERNEL__ */ |
| 219 | |
Akinobu Mita | 59e18a2 | 2006-03-26 01:39:31 -0800 | [diff] [blame] | 220 | #include <asm-generic/bitops/find.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | #ifdef __KERNEL__ |
Akinobu Mita | 59e18a2 | 2006-03-26 01:39:31 -0800 | [diff] [blame] | 223 | |
| 224 | #include <asm-generic/bitops/ext2-non-atomic.h> |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 225 | |
| 226 | /* '3' is bits per byte */ |
| 227 | #define LE_BYTE_ADDR ((sizeof(unsigned long) - 1) << 3) |
| 228 | |
Grant Grundler | a366064 | 2005-10-21 22:45:22 -0400 | [diff] [blame] | 229 | #define ext2_set_bit_atomic(l,nr,addr) \ |
| 230 | test_and_set_bit((nr) ^ LE_BYTE_ADDR, (unsigned long *)addr) |
| 231 | #define ext2_clear_bit_atomic(l,nr,addr) \ |
| 232 | test_and_clear_bit( (nr) ^ LE_BYTE_ADDR, (unsigned long *)addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
| 234 | #endif /* __KERNEL__ */ |
| 235 | |
Akinobu Mita | 59e18a2 | 2006-03-26 01:39:31 -0800 | [diff] [blame] | 236 | #include <asm-generic/bitops/minix-le.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
| 238 | #endif /* _PARISC_BITOPS_H */ |