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#include <linux/bitops.h>
#undef find_first_zero_bit
#undef find_next_zero_bit
#undef find_first_bit
#undef find_next_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);
}
/**
* find_next_zero_bit - find the next zero 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
*/
long find_next_zero_bit (const unsigned long * addr, long size, long offset)
{
const unsigned long * p = addr + (offset >> 6);
unsigned long set = 0;
unsigned long res, bit = offset&63;
if (bit) {
/*
* Look for zero in first word
*/
asm("bsfq %1,%0\n\t"
"cmoveq %2,%0"
: "=r" (set)
: "r" (~(*p >> bit)), "r"(64L));
if (set < (64 - bit))
return set + offset;
set = 64 - bit;
p++;
}
/*
* No zero yet, search remaining full words for a zero
*/
res = __find_first_zero_bit (p, size - 64 * (p - addr));
return (offset + set + res);
}
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);
}
/**
* find_next_bit - find the first 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
*/
long find_next_bit(const unsigned long * addr, long size, long offset)
{
const unsigned long * p = addr + (offset >> 6);
unsigned long set = 0, bit = offset & 63, res;
if (bit) {
/*
* Look for nonzero in the first 64 bits:
*/
asm("bsfq %1,%0\n\t"
"cmoveq %2,%0\n\t"
: "=r" (set)
: "r" (*p >> bit), "r" (64L));
if (set < (64 - bit))
return set + offset;
set = 64 - bit;
p++;
}
/*
* No set bit yet, search remaining full words for a bit
*/
res = __find_first_bit (p, size - 64 * (p - addr));
return (offset + set + res);
}
#include <linux/module.h>
EXPORT_SYMBOL(find_next_bit);
EXPORT_SYMBOL(find_first_bit);
EXPORT_SYMBOL(find_first_zero_bit);
EXPORT_SYMBOL(find_next_zero_bit);
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