diff options
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/lib/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/lib/bitops_64.c | 109 |
2 files changed, 0 insertions, 110 deletions
diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile index 436093299bd3..76f60f52a885 100644 --- a/arch/x86/lib/Makefile +++ b/arch/x86/lib/Makefile @@ -21,7 +21,6 @@ else lib-y += csum-partial_64.o csum-copy_64.o csum-wrappers_64.o lib-y += thunk_64.o clear_page_64.o copy_page_64.o - lib-y += bitops_64.o lib-y += memmove_64.o memset_64.o lib-y += copy_user_64.o rwlock_64.o copy_user_nocache_64.o endif diff --git a/arch/x86/lib/bitops_64.c b/arch/x86/lib/bitops_64.c deleted file mode 100644 index 568467d390c0..000000000000 --- a/arch/x86/lib/bitops_64.c +++ /dev/null @@ -1,109 +0,0 @@ -#ifndef CONFIG_GENERIC_FIND_FIRST_BIT -#include <linux/bitops.h> - -#undef find_first_zero_bit -#undef find_first_bit - -static inline long -__find_first_zero_bit(const unsigned long * addr, unsigned long size) -{ - long d0, d1, d2; - long res; - - /* - * We must test the size in words, not in bits, because - * otherwise incoming sizes in the range -63..-1 will not run - * any scasq instructions, and then the flags used by the je - * instruction will have whatever random value was in place - * before. Nobody should call us like that, but - * find_next_zero_bit() does when offset and size are at the - * same word and it fails to find a zero itself. - */ - size += 63; - size >>= 6; - if (!size) - return 0; - asm volatile( - " repe; scasq\n" - " je 1f\n" - " xorq -8(%%rdi),%%rax\n" - " subq $8,%%rdi\n" - " bsfq %%rax,%%rdx\n" - "1: subq %[addr],%%rdi\n" - " shlq $3,%%rdi\n" - " addq %%rdi,%%rdx" - :"=d" (res), "=&c" (d0), "=&D" (d1), "=&a" (d2) - :"0" (0ULL), "1" (size), "2" (addr), "3" (-1ULL), - [addr] "S" (addr) : "memory"); - /* - * Any register would do for [addr] above, but GCC tends to - * prefer rbx over rsi, even though rsi is readily available - * and doesn't have to be saved. - */ - return res; -} - -/** - * find_first_zero_bit - find the first zero 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 zero bit, not the number of the byte - * containing a bit. - */ -long find_first_zero_bit(const unsigned long * addr, unsigned long size) -{ - return __find_first_zero_bit (addr, size); -} - -static inline long -__find_first_bit(const unsigned long * addr, unsigned long size) -{ - long d0, d1; - long res; - - /* - * We must test the size in words, not in bits, because - * otherwise incoming sizes in the range -63..-1 will not run - * any scasq instructions, and then the flags used by the jz - * instruction will have whatever random value was in place - * before. Nobody should call us like that, but - * find_next_bit() does when offset and size are at the same - * word and it fails to find a one itself. - */ - size += 63; - size >>= 6; - if (!size) - return 0; - asm volatile( - " repe; scasq\n" - " jz 1f\n" - " subq $8,%%rdi\n" - " bsfq (%%rdi),%%rax\n" - "1: subq %[addr],%%rdi\n" - " shlq $3,%%rdi\n" - " addq %%rdi,%%rax" - :"=a" (res), "=&c" (d0), "=&D" (d1) - :"0" (0ULL), "1" (size), "2" (addr), - [addr] "r" (addr) : "memory"); - return res; -} - -/** - * 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. - */ -long find_first_bit(const unsigned long * addr, unsigned long size) -{ - return __find_first_bit(addr,size); -} - -#include <linux/module.h> - -EXPORT_SYMBOL(find_first_bit); -EXPORT_SYMBOL(find_first_zero_bit); -#endif |