/*
* bitops.c --- Bitmap frobbing code. See bitops.h for the inlined
* routines.
- *
+ *
* Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
*
* %Begin-Header%
- * This file may be redistributed under the terms of the GNU Public
- * License.
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
* %End-Header%
*/
+#include "config.h"
#include <stdio.h>
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
-#include <linux/ext2_fs.h>
-
+#include "ext2_fs.h"
#include "ext2fs.h"
#ifndef _EXT2_HAVE_ASM_BITOPS_
/*
* For the benefit of those who are trying to port Linux to another
* architecture, here are some C-language equivalents. You should
- * recode these in the native assmebly language, if at all possible.
+ * recode these in the native assembly language, if at all possible.
*
* C language equivalents written by Theodore Ts'o, 9/26/92.
* Modified by Pete A. Zaitcev 7/14/95 to be portable to big endian
* systems, as well as non-32 bit systems.
*/
-int ext2fs_set_bit(int nr,void * addr)
+int ext2fs_set_bit(unsigned int nr,void * addr)
{
int mask, retval;
unsigned char *ADDR = (unsigned char *) addr;
ADDR += nr >> 3;
mask = 1 << (nr & 0x07);
- retval = (mask & *ADDR) != 0;
+ retval = mask & *ADDR;
*ADDR |= mask;
return retval;
}
-int ext2fs_clear_bit(int nr, void * addr)
+int ext2fs_clear_bit(unsigned int nr, void * addr)
{
int mask, retval;
unsigned char *ADDR = (unsigned char *) addr;
ADDR += nr >> 3;
mask = 1 << (nr & 0x07);
- retval = (mask & *ADDR) != 0;
+ retval = mask & *ADDR;
*ADDR &= ~mask;
return retval;
}
-int ext2fs_test_bit(int nr, const void * addr)
+int ext2fs_test_bit(unsigned int nr, const void * addr)
{
int mask;
const unsigned char *ADDR = (const unsigned char *) addr;
ADDR += nr >> 3;
mask = 1 << (nr & 0x07);
- return ((mask & *ADDR) != 0);
+ return (mask & *ADDR);
}
#endif /* !_EXT2_HAVE_ASM_BITOPS_ */
{
#ifndef OMIT_COM_ERR
if (description)
- com_err(0, errcode, "#%u for %s", arg, description);
+ com_err(0, errcode, "#%lu for %s", arg, description);
else
- com_err(0, errcode, "#%u", arg);
+ com_err(0, errcode, "#%lu", arg);
#endif
}
-void ext2fs_warn_bitmap2(ext2fs_generic_bitmap bitmap,
- int code, unsigned long arg)
+/*
+ * C-only 64 bit ops.
+ */
+
+int ext2fs_set_bit64(__u64 nr, void * addr)
{
-#ifndef OMIT_COM_ERR
- if (bitmap->description)
- com_err(0, bitmap->base_error_code+code,
- "#%u for %s", arg, bitmap->description);
- else
- com_err(0, bitmap->base_error_code + code, "#%u", arg);
-#endif
+ int mask, retval;
+ unsigned char *ADDR = (unsigned char *) addr;
+
+ ADDR += nr >> 3;
+ mask = 1 << (nr & 0x07);
+ retval = mask & *ADDR;
+ *ADDR |= mask;
+ return retval;
+}
+
+int ext2fs_clear_bit64(__u64 nr, void * addr)
+{
+ int mask, retval;
+ unsigned char *ADDR = (unsigned char *) addr;
+
+ ADDR += nr >> 3;
+ mask = 1 << (nr & 0x07);
+ retval = mask & *ADDR;
+ *ADDR &= ~mask;
+ return retval;
+}
+
+int ext2fs_test_bit64(__u64 nr, const void * addr)
+{
+ int mask;
+ const unsigned char *ADDR = (const unsigned char *) addr;
+
+ ADDR += nr >> 3;
+ mask = 1 << (nr & 0x07);
+ return (mask & *ADDR);
}
+static unsigned int popcount8(unsigned int w)
+{
+ unsigned int res = w - ((w >> 1) & 0x55);
+ res = (res & 0x33) + ((res >> 2) & 0x33);
+ return (res + (res >> 4)) & 0x0F;
+}
+
+static unsigned int popcount32(unsigned int w)
+{
+ unsigned int res = w - ((w >> 1) & 0x55555555);
+ res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
+ res = (res + (res >> 4)) & 0x0F0F0F0F;
+ res = res + (res >> 8);
+ return (res + (res >> 16)) & 0x000000FF;
+}
+
+unsigned int ext2fs_bitcount(const void *addr, unsigned int nbytes)
+{
+ const unsigned char *cp = addr;
+ const __u32 *p;
+ unsigned int res = 0;
+
+ while (((((uintptr_t) cp) & 3) != 0) && (nbytes > 0)) {
+ res += popcount8(*cp++);
+ nbytes--;
+ }
+ p = (const __u32 *) cp;
+
+ while (nbytes > 4) {
+ res += popcount32(*p++);
+ nbytes -= 4;
+ }
+ cp = (const unsigned char *) p;
+
+ while (nbytes > 0) {
+ res += popcount8(*cp++);
+ nbytes--;
+ }
+ return res;
+}