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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-sparc64/bitops.h | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-sparc64/bitops.h')
-rw-r--r-- | include/asm-sparc64/bitops.h | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/include/asm-sparc64/bitops.h b/include/asm-sparc64/bitops.h new file mode 100644 index 0000000..9d722dc --- /dev/null +++ b/include/asm-sparc64/bitops.h @@ -0,0 +1,294 @@ +/* $Id: bitops.h,v 1.39 2002/01/30 01:40:00 davem Exp $ + * bitops.h: Bit string operations on the V9. + * + * Copyright 1996, 1997 David S. Miller (davem@caip.rutgers.edu) + */ + +#ifndef _SPARC64_BITOPS_H +#define _SPARC64_BITOPS_H + +#include <linux/config.h> +#include <linux/compiler.h> +#include <asm/byteorder.h> + +extern int test_and_set_bit(unsigned long nr, volatile unsigned long *addr); +extern int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr); +extern int test_and_change_bit(unsigned long nr, volatile unsigned long *addr); +extern void set_bit(unsigned long nr, volatile unsigned long *addr); +extern void clear_bit(unsigned long nr, volatile unsigned long *addr); +extern void change_bit(unsigned long nr, volatile unsigned long *addr); + +/* "non-atomic" versions... */ + +static __inline__ void __set_bit(int nr, volatile unsigned long *addr) +{ + volatile unsigned long *m = addr + (nr >> 6); + + *m |= (1UL << (nr & 63)); +} + +static __inline__ void __clear_bit(int nr, volatile unsigned long *addr) +{ + volatile unsigned long *m = addr + (nr >> 6); + + *m &= ~(1UL << (nr & 63)); +} + +static __inline__ void __change_bit(int nr, volatile unsigned long *addr) +{ + volatile unsigned long *m = addr + (nr >> 6); + + *m ^= (1UL << (nr & 63)); +} + +static __inline__ int __test_and_set_bit(int nr, volatile unsigned long *addr) +{ + volatile unsigned long *m = addr + (nr >> 6); + long old = *m; + long mask = (1UL << (nr & 63)); + + *m = (old | mask); + return ((old & mask) != 0); +} + +static __inline__ int __test_and_clear_bit(int nr, volatile unsigned long *addr) +{ + volatile unsigned long *m = addr + (nr >> 6); + long old = *m; + long mask = (1UL << (nr & 63)); + + *m = (old & ~mask); + return ((old & mask) != 0); +} + +static __inline__ int __test_and_change_bit(int nr, volatile unsigned long *addr) +{ + volatile unsigned long *m = addr + (nr >> 6); + long old = *m; + long mask = (1UL << (nr & 63)); + + *m = (old ^ mask); + return ((old & mask) != 0); +} + +#ifdef CONFIG_SMP +#define smp_mb__before_clear_bit() membar("#StoreLoad | #LoadLoad") +#define smp_mb__after_clear_bit() membar("#StoreLoad | #StoreStore") +#else +#define smp_mb__before_clear_bit() barrier() +#define smp_mb__after_clear_bit() barrier() +#endif + +static __inline__ int test_bit(int nr, __const__ volatile unsigned long *addr) +{ + return (1UL & ((addr)[nr >> 6] >> (nr & 63))) != 0UL; +} + +/* The easy/cheese version for now. */ +static __inline__ unsigned long ffz(unsigned long word) +{ + unsigned long result; + + result = 0; + while(word & 1) { + result++; + word >>= 1; + } + return result; +} + +/** + * __ffs - find first bit in word. + * @word: The word to search + * + * Undefined if no bit exists, so code should check against 0 first. + */ +static __inline__ unsigned long __ffs(unsigned long word) +{ + unsigned long result = 0; + + while (!(word & 1UL)) { + result++; + word >>= 1; + } + return result; +} + +/* + * fls: find last bit set. + */ + +#define fls(x) generic_fls(x) + +#ifdef __KERNEL__ + +/* + * Every architecture must define this function. It's the fastest + * way of searching a 140-bit bitmap where the first 100 bits are + * unlikely to be set. It's guaranteed that at least one of the 140 + * bits is cleared. + */ +static inline int sched_find_first_bit(unsigned long *b) +{ + if (unlikely(b[0])) + return __ffs(b[0]); + if (unlikely(((unsigned int)b[1]))) + return __ffs(b[1]) + 64; + if (b[1] >> 32) + return __ffs(b[1] >> 32) + 96; + return __ffs(b[2]) + 128; +} + +/* + * ffs: find first bit set. This is defined the same way as + * the libc and compiler builtin ffs routines, therefore + * differs in spirit from the above ffz (man ffs). + */ +static __inline__ int ffs(int x) +{ + if (!x) + return 0; + return __ffs((unsigned long)x) + 1; +} + +/* + * hweightN: returns the hamming weight (i.e. the number + * of bits set) of a N-bit word + */ + +#ifdef ULTRA_HAS_POPULATION_COUNT + +static __inline__ unsigned int hweight64(unsigned long w) +{ + unsigned int res; + + __asm__ ("popc %1,%0" : "=r" (res) : "r" (w)); + return res; +} + +static __inline__ unsigned int hweight32(unsigned int w) +{ + unsigned int res; + + __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffffffff)); + return res; +} + +static __inline__ unsigned int hweight16(unsigned int w) +{ + unsigned int res; + + __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffff)); + return res; +} + +static __inline__ unsigned int hweight8(unsigned int w) +{ + unsigned int res; + + __asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xff)); + return res; +} + +#else + +#define hweight64(x) generic_hweight64(x) +#define hweight32(x) generic_hweight32(x) +#define hweight16(x) generic_hweight16(x) +#define hweight8(x) generic_hweight8(x) + +#endif +#endif /* __KERNEL__ */ + +/** + * find_next_bit - find the next set bit in a memory region + * @addr: The address to base the search on + * @offset: The bitnumber to start searching at + * @size: The maximum size to search + */ +extern unsigned long find_next_bit(const unsigned long *, unsigned long, + unsigned long); + +/** + * find_first_bit - find the first set bit in a memory region + * @addr: The address to start the search at + * @size: The maximum size to search + * + * Returns the bit-number of the first set bit, not the number of the byte + * containing a bit. + */ +#define find_first_bit(addr, size) \ + find_next_bit((addr), (size), 0) + +/* find_next_zero_bit() finds the first zero bit in a bit string of length + * 'size' bits, starting the search at bit 'offset'. This is largely based + * on Linus's ALPHA routines, which are pretty portable BTW. + */ + +extern unsigned long find_next_zero_bit(const unsigned long *, + unsigned long, unsigned long); + +#define find_first_zero_bit(addr, size) \ + find_next_zero_bit((addr), (size), 0) + +#define test_and_set_le_bit(nr,addr) \ + test_and_set_bit((nr) ^ 0x38, (addr)) +#define test_and_clear_le_bit(nr,addr) \ + test_and_clear_bit((nr) ^ 0x38, (addr)) + +static __inline__ int test_le_bit(int nr, __const__ unsigned long * addr) +{ + int mask; + __const__ unsigned char *ADDR = (__const__ unsigned char *) addr; + + ADDR += nr >> 3; + mask = 1 << (nr & 0x07); + return ((mask & *ADDR) != 0); +} + +#define find_first_zero_le_bit(addr, size) \ + find_next_zero_le_bit((addr), (size), 0) + +extern unsigned long find_next_zero_le_bit(unsigned long *, unsigned long, unsigned long); + +#ifdef __KERNEL__ + +#define __set_le_bit(nr, addr) \ + __set_bit((nr) ^ 0x38, (addr)) +#define __clear_le_bit(nr, addr) \ + __clear_bit((nr) ^ 0x38, (addr)) +#define __test_and_clear_le_bit(nr, addr) \ + __test_and_clear_bit((nr) ^ 0x38, (addr)) +#define __test_and_set_le_bit(nr, addr) \ + __test_and_set_bit((nr) ^ 0x38, (addr)) + +#define ext2_set_bit(nr,addr) \ + __test_and_set_le_bit((nr),(unsigned long *)(addr)) +#define ext2_set_bit_atomic(lock,nr,addr) \ + test_and_set_le_bit((nr),(unsigned long *)(addr)) +#define ext2_clear_bit(nr,addr) \ + __test_and_clear_le_bit((nr),(unsigned long *)(addr)) +#define ext2_clear_bit_atomic(lock,nr,addr) \ + test_and_clear_le_bit((nr),(unsigned long *)(addr)) +#define ext2_test_bit(nr,addr) \ + test_le_bit((nr),(unsigned long *)(addr)) +#define ext2_find_first_zero_bit(addr, size) \ + find_first_zero_le_bit((unsigned long *)(addr), (size)) +#define ext2_find_next_zero_bit(addr, size, off) \ + find_next_zero_le_bit((unsigned long *)(addr), (size), (off)) + +/* Bitmap functions for the minix filesystem. */ +#define minix_test_and_set_bit(nr,addr) \ + test_and_set_bit((nr),(unsigned long *)(addr)) +#define minix_set_bit(nr,addr) \ + set_bit((nr),(unsigned long *)(addr)) +#define minix_test_and_clear_bit(nr,addr) \ + test_and_clear_bit((nr),(unsigned long *)(addr)) +#define minix_test_bit(nr,addr) \ + test_bit((nr),(unsigned long *)(addr)) +#define minix_find_first_zero_bit(addr,size) \ + find_first_zero_bit((unsigned long *)(addr),(size)) + +#endif /* __KERNEL__ */ + +#endif /* defined(_SPARC64_BITOPS_H) */ |