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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-v850/bitops.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2v2.6.12-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-v850/bitops.h')
-rw-r--r-- | include/asm-v850/bitops.h | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/include/asm-v850/bitops.h b/include/asm-v850/bitops.h new file mode 100644 index 000000000000..7c4ecaf5151c --- /dev/null +++ b/include/asm-v850/bitops.h @@ -0,0 +1,355 @@ +/* + * include/asm-v850/bitops.h -- Bit operations + * + * Copyright (C) 2001,02,03,04 NEC Electronics Corporation + * Copyright (C) 2001,02,03,04 Miles Bader <miles@gnu.org> + * Copyright (C) 1992 Linus Torvalds. + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#ifndef __V850_BITOPS_H__ +#define __V850_BITOPS_H__ + + +#include <linux/config.h> +#include <linux/compiler.h> /* unlikely */ +#include <asm/byteorder.h> /* swab32 */ +#include <asm/system.h> /* interrupt enable/disable */ + + +#ifdef __KERNEL__ + +/* + * The __ functions are not atomic + */ + +/* + * ffz = Find First Zero in word. Undefined if no zero exists, + * so code should check against ~0UL first.. + */ +extern __inline__ unsigned long ffz (unsigned long word) +{ + unsigned long result = 0; + + while (word & 1) { + result++; + word >>= 1; + } + return result; +} + + +/* In the following constant-bit-op macros, a "g" constraint is used when + we really need an integer ("i" constraint). This is to avoid + warnings/errors from the compiler in the case where the associated + operand _isn't_ an integer, and shouldn't produce bogus assembly because + use of that form is protected by a guard statement that checks for + constants, and should otherwise be removed by the optimizer. This + _usually_ works -- however, __builtin_constant_p returns true for a + variable with a known constant value too, and unfortunately gcc will + happily put the variable in a register and use the register for the "g" + constraint'd asm operand. To avoid the latter problem, we add a + constant offset to the operand and subtract it back in the asm code; + forcing gcc to do arithmetic on the value is usually enough to get it + to use a real constant value. This is horrible, and ultimately + unreliable too, but it seems to work for now (hopefully gcc will offer + us more control in the future, so we can do a better job). */ + +#define __const_bit_op(op, nr, addr) \ + ({ __asm__ (op " (%0 - 0x123), %1" \ + :: "g" (((nr) & 0x7) + 0x123), \ + "m" (*((char *)(addr) + ((nr) >> 3))) \ + : "memory"); }) +#define __var_bit_op(op, nr, addr) \ + ({ int __nr = (nr); \ + __asm__ (op " %0, [%1]" \ + :: "r" (__nr & 0x7), \ + "r" ((char *)(addr) + (__nr >> 3)) \ + : "memory"); }) +#define __bit_op(op, nr, addr) \ + ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \ + ? __const_bit_op (op, nr, addr) \ + : __var_bit_op (op, nr, addr)) + +#define __set_bit(nr, addr) __bit_op ("set1", nr, addr) +#define __clear_bit(nr, addr) __bit_op ("clr1", nr, addr) +#define __change_bit(nr, addr) __bit_op ("not1", nr, addr) + +/* The bit instructions used by `non-atomic' variants are actually atomic. */ +#define set_bit __set_bit +#define clear_bit __clear_bit +#define change_bit __change_bit + + +#define __const_tns_bit_op(op, nr, addr) \ + ({ int __tns_res; \ + __asm__ __volatile__ ( \ + "tst1 (%1 - 0x123), %2; setf nz, %0; " op " (%1 - 0x123), %2" \ + : "=&r" (__tns_res) \ + : "g" (((nr) & 0x7) + 0x123), \ + "m" (*((char *)(addr) + ((nr) >> 3))) \ + : "memory"); \ + __tns_res; \ + }) +#define __var_tns_bit_op(op, nr, addr) \ + ({ int __nr = (nr); \ + int __tns_res; \ + __asm__ __volatile__ ( \ + "tst1 %1, [%2]; setf nz, %0; " op " %1, [%2]" \ + : "=&r" (__tns_res) \ + : "r" (__nr & 0x7), \ + "r" ((char *)(addr) + (__nr >> 3)) \ + : "memory"); \ + __tns_res; \ + }) +#define __tns_bit_op(op, nr, addr) \ + ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \ + ? __const_tns_bit_op (op, nr, addr) \ + : __var_tns_bit_op (op, nr, addr)) +#define __tns_atomic_bit_op(op, nr, addr) \ + ({ int __tns_atomic_res, __tns_atomic_flags; \ + local_irq_save (__tns_atomic_flags); \ + __tns_atomic_res = __tns_bit_op (op, nr, addr); \ + local_irq_restore (__tns_atomic_flags); \ + __tns_atomic_res; \ + }) + +#define __test_and_set_bit(nr, addr) __tns_bit_op ("set1", nr, addr) +#define test_and_set_bit(nr, addr) __tns_atomic_bit_op ("set1", nr, addr) + +#define __test_and_clear_bit(nr, addr) __tns_bit_op ("clr1", nr, addr) +#define test_and_clear_bit(nr, addr) __tns_atomic_bit_op ("clr1", nr, addr) + +#define __test_and_change_bit(nr, addr) __tns_bit_op ("not1", nr, addr) +#define test_and_change_bit(nr, addr) __tns_atomic_bit_op ("not1", nr, addr) + + +#define __const_test_bit(nr, addr) \ + ({ int __test_bit_res; \ + __asm__ __volatile__ ("tst1 (%1 - 0x123), %2; setf nz, %0" \ + : "=r" (__test_bit_res) \ + : "g" (((nr) & 0x7) + 0x123), \ + "m" (*((const char *)(addr) + ((nr) >> 3)))); \ + __test_bit_res; \ + }) +extern __inline__ int __test_bit (int nr, const void *addr) +{ + int res; + __asm__ __volatile__ ("tst1 %1, [%2]; setf nz, %0" + : "=r" (res) + : "r" (nr & 0x7), "r" (addr + (nr >> 3))); + return res; +} +#define test_bit(nr,addr) \ + ((__builtin_constant_p (nr) && (unsigned)(nr) <= 0x7FFFF) \ + ? __const_test_bit ((nr), (addr)) \ + : __test_bit ((nr), (addr))) + + +/* clear_bit doesn't provide any barrier for the compiler. */ +#define smp_mb__before_clear_bit() barrier () +#define smp_mb__after_clear_bit() barrier () + + +#define find_first_zero_bit(addr, size) \ + find_next_zero_bit ((addr), (size), 0) + +extern __inline__ int find_next_zero_bit (void *addr, int size, int offset) +{ + unsigned long *p = ((unsigned long *) addr) + (offset >> 5); + unsigned long result = offset & ~31UL; + unsigned long tmp; + + if (offset >= size) + return size; + size -= result; + offset &= 31UL; + if (offset) { + tmp = * (p++); + tmp |= ~0UL >> (32-offset); + if (size < 32) + goto found_first; + if (~tmp) + goto found_middle; + size -= 32; + result += 32; + } + while (size & ~31UL) { + if (~ (tmp = * (p++))) + goto found_middle; + result += 32; + size -= 32; + } + if (!size) + return result; + tmp = *p; + + found_first: + tmp |= ~0UL >> size; + found_middle: + return result + ffz (tmp); +} + + +/* This is the same as generic_ffs, but we can't use that because it's + inline and the #include order mucks things up. */ +static inline int generic_ffs_for_find_next_bit(int x) +{ + int r = 1; + + if (!x) + return 0; + if (!(x & 0xffff)) { + x >>= 16; + r += 16; + } + if (!(x & 0xff)) { + x >>= 8; + r += 8; + } + if (!(x & 0xf)) { + x >>= 4; + r += 4; + } + if (!(x & 3)) { + x >>= 2; + r += 2; + } + if (!(x & 1)) { + x >>= 1; + r += 1; + } + return r; +} + +/* + * Find next one bit in a bitmap reasonably efficiently. + */ +static __inline__ unsigned long find_next_bit(const unsigned long *addr, + unsigned long size, unsigned long offset) +{ + unsigned int *p = ((unsigned int *) addr) + (offset >> 5); + unsigned int result = offset & ~31UL; + unsigned int tmp; + + if (offset >= size) + return size; + size -= result; + offset &= 31UL; + if (offset) { + tmp = *p++; + tmp &= ~0UL << offset; + if (size < 32) + goto found_first; + if (tmp) + goto found_middle; + size -= 32; + result += 32; + } + while (size >= 32) { + if ((tmp = *p++) != 0) + goto found_middle; + result += 32; + size -= 32; + } + if (!size) + return result; + tmp = *p; + +found_first: + tmp &= ~0UL >> (32 - size); + if (tmp == 0UL) /* Are any bits set? */ + return result + size; /* Nope. */ +found_middle: + return result + generic_ffs_for_find_next_bit(tmp); +} + +/* + * find_first_bit - find the first set bit in a memory region + */ +#define find_first_bit(addr, size) \ + find_next_bit((addr), (size), 0) + + +#define ffs(x) generic_ffs (x) +#define fls(x) generic_fls (x) +#define __ffs(x) ffs(x) + + +/* + * This is just `generic_ffs' from <linux/bitops.h>, except that it assumes + * that at least one bit is set, and returns the real index of the bit + * (rather than the bit index + 1, like ffs does). + */ +static inline int sched_ffs(int x) +{ + int r = 0; + + if (!(x & 0xffff)) { + x >>= 16; + r += 16; + } + if (!(x & 0xff)) { + x >>= 8; + r += 8; + } + if (!(x & 0xf)) { + x >>= 4; + r += 4; + } + if (!(x & 3)) { + x >>= 2; + r += 2; + } + if (!(x & 1)) { + x >>= 1; + r += 1; + } + return r; +} + +/* + * 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 set. + */ +static inline int sched_find_first_bit(unsigned long *b) +{ + unsigned offs = 0; + while (! *b) { + b++; + offs += 32; + } + return sched_ffs (*b) + offs; +} + +/* + * hweightN: returns the hamming weight (i.e. the number + * of bits set) of a N-bit word + */ +#define hweight32(x) generic_hweight32 (x) +#define hweight16(x) generic_hweight16 (x) +#define hweight8(x) generic_hweight8 (x) + +#define ext2_set_bit test_and_set_bit +#define ext2_set_bit_atomic(l,n,a) test_and_set_bit(n,a) +#define ext2_clear_bit test_and_clear_bit +#define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a) +#define ext2_test_bit test_bit +#define ext2_find_first_zero_bit find_first_zero_bit +#define ext2_find_next_zero_bit find_next_zero_bit + +/* Bitmap functions for the minix filesystem. */ +#define minix_test_and_set_bit test_and_set_bit +#define minix_set_bit set_bit +#define minix_test_and_clear_bit test_and_clear_bit +#define minix_test_bit test_bit +#define minix_find_first_zero_bit find_first_zero_bit + +#endif /* __KERNEL__ */ + +#endif /* __V850_BITOPS_H__ */ |