patch-2.4.25 linux-2.4.25/fs/xfs/xfs_bit.h

• Lines: 86
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/fs/xfs/xfs_bit.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_bit.h linux-2.4.25/fs/xfs/xfs_bit.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2000, 2002 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#ifndef __XFS_BIT_H__
+#define	__XFS_BIT_H__
+
+/*
+ * XFS bit manipulation routines.
+ */
+
+/*
+ * masks with n high/low bits set, 32-bit values & 64-bit values
+ */
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK32HI)
+__uint32_t xfs_mask32hi(int n);
+#define	XFS_MASK32HI(n)		xfs_mask32hi(n)
+#else
+#define	XFS_MASK32HI(n)		((__uint32_t)-1 << (32 - (n)))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK64HI)
+__uint64_t xfs_mask64hi(int n);
+#define	XFS_MASK64HI(n)		xfs_mask64hi(n)
+#else
+#define	XFS_MASK64HI(n)		((__uint64_t)-1 << (64 - (n)))
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK32LO)
+__uint32_t xfs_mask32lo(int n);
+#define	XFS_MASK32LO(n)		xfs_mask32lo(n)
+#else
+#define	XFS_MASK32LO(n)		(((__uint32_t)1 << (n)) - 1)
+#endif
+#if XFS_WANT_FUNCS || (XFS_WANT_SPACE && XFSSO_XFS_MASK64LO)
+__uint64_t xfs_mask64lo(int n);
+#define	XFS_MASK64LO(n)		xfs_mask64lo(n)
+#else
+#define	XFS_MASK64LO(n)		(((__uint64_t)1 << (n)) - 1)
+#endif
+
+/* Get high bit set out of 32-bit argument, -1 if none set */
+extern int xfs_highbit32(__uint32_t v);
+
+/* Get low bit set out of 64-bit argument, -1 if none set */
+extern int xfs_lowbit64(__uint64_t v);
+
+/* Get high bit set out of 64-bit argument, -1 if none set */
+extern int xfs_highbit64(__uint64_t);
+
+/* Count set bits in map starting with start_bit */
+extern int xfs_count_bits(uint *map, uint size, uint start_bit);
+
+/* Count continuous one bits in map starting with start_bit */
+extern int xfs_contig_bits(uint *map, uint size, uint start_bit);
+
+/* Find next set bit in map */
+extern int xfs_next_bit(uint *map, uint size, uint start_bit);
+
+#endif	/* __XFS_BIT_H__ */