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-rw-r--r--tools/lib/find_bit.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/tools/lib/find_bit.c b/tools/lib/find_bit.c
index 109aa7ffcf97..ba4b8d94e004 100644
--- a/tools/lib/find_bit.c
+++ b/tools/lib/find_bit.c
@@ -96,6 +96,26 @@ unsigned long _find_first_bit(const unsigned long *addr, unsigned long size)
}
#endif
+#ifndef find_first_and_bit
+/*
+ * Find the first set bit in two memory regions.
+ */
+unsigned long _find_first_and_bit(const unsigned long *addr1,
+ const unsigned long *addr2,
+ unsigned long size)
+{
+ unsigned long idx, val;
+
+ for (idx = 0; idx * BITS_PER_LONG < size; idx++) {
+ val = addr1[idx] & addr2[idx];
+ if (val)
+ return min(idx * BITS_PER_LONG + __ffs(val), size);
+ }
+
+ return size;
+}
+#endif
+
#ifndef find_first_zero_bit
/*
* Find the first cleared bit in a memory region.