Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / include / ipxe / bitmap.h

diff --git a/qemu/roms/ipxe/src/include/ipxe/bitmap.h b/qemu/roms/ipxe/src/include/ipxe/bitmap.h
new file mode 100644 (file)
index 0000000..b18584c
--- /dev/null
+++ b/qemu/roms/ipxe/src/include/ipxe/bitmap.h
@@ -0,0 +1,85 @@
+#ifndef _IPXE_BITMAP_H
+#define _IPXE_BITMAP_H
+
+/** @file
+ *
+ * Bitmaps for multicast downloads
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+/** A single block of bits within a bitmap */
+typedef unsigned long bitmap_block_t;
+
+/** Size of a block of bits (in bits) */
+#define BITMAP_BLKSIZE ( sizeof ( bitmap_block_t ) * 8 )
+
+/**
+ * Block index within bitmap
+ *
+ * @v bit              Bit index
+ * @ret index          Block index
+ */
+#define BITMAP_INDEX( bit ) ( (bit) / BITMAP_BLKSIZE )
+
+/**
+ * Block mask within bitmap
+ *
+ * @v bit              Bit index
+ * @ret mask           Block mask
+ */
+#define BITMAP_MASK( bit ) ( 1UL << ( (bit) % BITMAP_BLKSIZE ) )
+
+/** A bitmap */
+struct bitmap {
+       /** Bitmap data */
+       bitmap_block_t *blocks;
+       /** Length of the bitmap, in bits */
+       unsigned int length;
+       /** Index of first gap in the bitmap */
+       unsigned int first_gap;
+};
+
+extern int bitmap_resize ( struct bitmap *bitmap, unsigned int new_length );
+extern int bitmap_test ( struct bitmap *bitmap, unsigned int bit );
+extern void bitmap_set ( struct bitmap *bitmap, unsigned int bit );
+
+/**
+ * Free bitmap resources
+ *
+ * @v bitmap           Bitmap
+ */
+static inline void bitmap_free ( struct bitmap *bitmap ) {
+       free ( bitmap->blocks );
+}
+
+/**
+ * Get first gap within bitmap
+ *
+ * @v bitmap           Bitmap
+ * @ret first_gap      First gap
+ *
+ * The first gap is the first unset bit within the bitmap.
+ */
+static inline unsigned int bitmap_first_gap ( struct bitmap *bitmap ) {
+       return bitmap->first_gap;
+}
+
+/**
+ * Check to see if bitmap is full
+ *
+ * @v bitmap           Bitmap
+ * @ret is_full                Bitmap is full
+ *
+ * The bitmap is full if it has no gaps (i.e. no unset bits).
+ */
+static inline int bitmap_full ( struct bitmap *bitmap ) {
+       return ( bitmap->first_gap == bitmap->length );
+}
+
+#endif /* _IPXE_BITMAP_H */