1 files changed, 56 insertions, 0 deletions
diff --git a/roms/skiboot/include/bitmap.h b/roms/skiboot/include/bitmap.h
new file mode 100644
index 000000000..fa3a57fe3
--- /dev/null
+++ b/roms/skiboot/include/bitmap.h
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+/* Copyright 2016-2017 IBM Corp. */
+
+#ifndef __BITMAP_H
+#define __BITMAP_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef unsigned long bitmap_elem_t;
+typedef bitmap_elem_t bitmap_t[];
+
+#define BITMAP_ELSZ	(sizeof(bitmap_elem_t) << 3)
+
+/* Number of elements for _n bits (rounded up) */
+#define BITMAP_ELEMS(_n)	(((_n) + (BITMAP_ELSZ - 1)) / BITMAP_ELSZ)
+/* Number of bytes for _n bits (rounded up) */
+#define BITMAP_BYTES(_n)	(BITMAP_ELEMS(_n) * sizeof(bitmap_elem_t))
+/* Bit number within an elemnt for bit _n */
+#define BITMAP_BIT(_n)		((_n) & (BITMAP_ELSZ - 1))
+/* Corresponding mask */
+#define BITMAP_MASK(_n)		(1ul << BITMAP_BIT(_n))
+/* Element number for bit _n */
+#define BITMAP_ELEM(_n)		((_n) / BITMAP_ELSZ)
+
+static inline void bitmap_set_bit(bitmap_t map, unsigned int bit)
+{
+	map[BITMAP_ELEM(bit)] |= BITMAP_MASK(bit);
+}
+
+static inline void bitmap_clr_bit(bitmap_t map, unsigned int bit)
+{
+	map[BITMAP_ELEM(bit)] &= ~BITMAP_MASK(bit);
+}
+
+static inline bool bitmap_tst_bit(bitmap_t map, unsigned int bit)
+{
+	return map[BITMAP_ELEM(bit)] & BITMAP_MASK(bit);
+}
+
+extern int bitmap_find_zero_bit(bitmap_t map, unsigned int start,
+				unsigned int count);
+extern int bitmap_find_one_bit(bitmap_t map, unsigned int start,
+				unsigned int count);
+
+#define bitmap_for_each_zero(map, size, bit)                   \
+	for (bit = bitmap_find_zero_bit(map, 0, size);         \
+	     bit >= 0;					       \
+	     bit = bitmap_find_zero_bit(map, (bit) + 1, (size) - (bit) - 1))
+
+#define bitmap_for_each_one(map, size, bit)                    \
+	for (bit = bitmap_find_one_bit(map, 0, size);          \
+	     bit >= 0;					       \
+	     bit = bitmap_find_one_bit(map, (bit) + 1, (size) - (bit) - 1))
+
+#endif /* __BITMAP_H */