* %End-Header%
*/
+#include "config.h"
#include <stdio.h>
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
/*
* 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
com_err(0, errcode, "#%lu", arg);
#endif
}
+
+/*
+ * C-only 64 bit ops.
+ */
+
+int ext2fs_set_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_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;
+}