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!
diff --git a/arch/x86_64/lib/bitops.c b/arch/x86_64/lib/bitops.c
new file mode 100644
index 0000000..a29fb75
--- /dev/null
+++ b/arch/x86_64/lib/bitops.c
@@ -0,0 +1,141 @@
+#include <linux/bitops.h>
+
+#undef find_first_zero_bit
+#undef find_next_zero_bit
+#undef find_first_bit
+#undef find_next_bit
+
+/**
+ * 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.
+ */
+inline long find_first_zero_bit(const unsigned long * addr, unsigned long size)
+{
+ long d0, d1, d2;
+ long res;
+
+ 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 + 63) >> 6), "2" (addr), "3" (-1ULL),
+ [addr] "r" (addr) : "memory");
+ return res;
+}
+
+/**
+ * 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)
+{
+ unsigned long * p = ((unsigned long *) 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 ((const unsigned long *)p,
+ size - 64 * (p - (unsigned long *) addr));
+ return (offset + set + res);
+}
+
+static inline long
+__find_first_bit(const unsigned long * addr, unsigned long size)
+{
+ long d0, d1;
+ long res;
+
+ 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 + 63) >> 6), "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);