x86_64: prepare shared lib/bitops.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 175 deletions

diff --git a/arch/x86_64/lib/bitops.c b/arch/x86_64/lib/bitops.c
deleted file mode 100644
index 95b6d9639fb..00000000000
--- a/arch/x86_64/lib/bitops.c
+++ /dev/null
@@ -1,175 +0,0 @@
-#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 first 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);