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+#ifndef _MICROBLAZE_BITOPS_H
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+#define _MICROBLAZE_BITOPS_H
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+
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+/*
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+ * Copyright 1992, Linus Torvalds.
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+ */
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+
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+#include <linux/config.h>
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+#include <asm/byteorder.h> /* swab32 */
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+#include <asm/system.h> /* save_flags */
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+
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+#ifdef __KERNEL__
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+/*
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+ * Function prototypes to keep gcc -Wall happy
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+ */
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+
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+/*
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+ * The __ functions are not atomic
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+ */
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+
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+extern void set_bit(int nr, volatile void * addr);
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+extern void __set_bit(int nr, volatile void * addr);
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+
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+extern void clear_bit(int nr, volatile void * addr);
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+#define __clear_bit(nr, addr) clear_bit(nr, addr)
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+
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+extern void change_bit(int nr, volatile void * addr);
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+extern void __change_bit(int nr, volatile void * addr);
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+extern int test_and_set_bit(int nr, volatile void * addr);
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+extern int __test_and_set_bit(int nr, volatile void * addr);
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+extern int test_and_clear_bit(int nr, volatile void * addr);
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+extern int __test_and_clear_bit(int nr, volatile void * addr);
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+extern int test_and_change_bit(int nr, volatile void * addr);
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+extern int __test_and_change_bit(int nr, volatile void * addr);
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+extern int __constant_test_bit(int nr, const volatile void * addr);
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+extern int __test_bit(int nr, volatile void * addr);
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+extern int find_first_zero_bit(void * addr, unsigned size);
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+extern int find_next_zero_bit (void * addr, int size, int offset);
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+
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+/*
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+ * ffz = Find First Zero in word. Undefined if no zero exists,
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+ * so code should check against ~0UL first..
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+ */
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+extern __inline__ unsigned long ffz(unsigned long word)
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+{
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+ unsigned long result = 0;
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+
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+ while(word & 1) {
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+ result++;
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+ word >>= 1;
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+ }
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+ return result;
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+}
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+
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+
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+extern __inline__ void set_bit(int nr, volatile void * addr)
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+{
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+ int * a = (int *) addr;
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+ int mask;
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+ unsigned long flags;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ save_flags_cli(flags);
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+ *a |= mask;
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+ restore_flags(flags);
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+}
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+
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+extern __inline__ void __set_bit(int nr, volatile void * addr)
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+{
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+ int * a = (int *) addr;
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+ int mask;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ *a |= mask;
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+}
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+
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+/*
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+ * clear_bit() doesn't provide any barrier for the compiler.
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+ */
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+#define smp_mb__before_clear_bit() barrier()
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+#define smp_mb__after_clear_bit() barrier()
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+
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+extern __inline__ void clear_bit(int nr, volatile void * addr)
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+{
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+ int * a = (int *) addr;
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+ int mask;
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+ unsigned long flags;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ save_flags_cli(flags);
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+ *a &= ~mask;
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+ restore_flags(flags);
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+}
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+
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+extern __inline__ void change_bit(int nr, volatile void * addr)
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+{
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+ int mask;
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+ unsigned long flags;
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+ unsigned long *ADDR = (unsigned long *) addr;
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+
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+ ADDR += nr >> 5;
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+ mask = 1 << (nr & 31);
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+ save_flags_cli(flags);
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+ *ADDR ^= mask;
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+ restore_flags(flags);
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+}
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+
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+extern __inline__ void __change_bit(int nr, volatile void * addr)
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+{
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+ int mask;
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+ unsigned long *ADDR = (unsigned long *) addr;
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+
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+ ADDR += nr >> 5;
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+ mask = 1 << (nr & 31);
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+ *ADDR ^= mask;
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+}
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+
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+extern __inline__ int test_and_set_bit(int nr, volatile void * addr)
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+{
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+ int mask, retval;
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+ volatile unsigned int *a = (volatile unsigned int *) addr;
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+ unsigned long flags;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ save_flags_cli(flags);
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+ retval = (mask & *a) != 0;
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+ *a |= mask;
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+ restore_flags(flags);
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+
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+ return retval;
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+}
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+
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+extern __inline__ int __test_and_set_bit(int nr, volatile void * addr)
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+{
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+ int mask, retval;
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+ volatile unsigned int *a = (volatile unsigned int *) addr;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ retval = (mask & *a) != 0;
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+ *a |= mask;
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+ return retval;
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+}
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+
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+extern __inline__ int test_and_clear_bit(int nr, volatile void * addr)
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+{
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+ int mask, retval;
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+ volatile unsigned int *a = (volatile unsigned int *) addr;
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+ unsigned long flags;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ save_flags_cli(flags);
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+ retval = (mask & *a) != 0;
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+ *a &= ~mask;
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+ restore_flags(flags);
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+
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+ return retval;
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+}
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+
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+extern __inline__ int __test_and_clear_bit(int nr, volatile void * addr)
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+{
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+ int mask, retval;
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+ volatile unsigned int *a = (volatile unsigned int *) addr;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ retval = (mask & *a) != 0;
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+ *a &= ~mask;
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+ return retval;
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+}
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+
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+extern __inline__ int test_and_change_bit(int nr, volatile void * addr)
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+{
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+ int mask, retval;
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+ volatile unsigned int *a = (volatile unsigned int *) addr;
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+ unsigned long flags;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ save_flags_cli(flags);
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+ retval = (mask & *a) != 0;
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+ *a ^= mask;
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+ restore_flags(flags);
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+
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+ return retval;
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+}
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+
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+extern __inline__ int __test_and_change_bit(int nr, volatile void * addr)
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+{
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+ int mask, retval;
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+ volatile unsigned int *a = (volatile unsigned int *) addr;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ retval = (mask & *a) != 0;
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+ *a ^= mask;
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+ return retval;
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+}
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+
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+/*
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+ * This routine doesn't need to be atomic.
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+ */
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+extern __inline__ int __constant_test_bit(int nr, const volatile void * addr)
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+{
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+ return ((1UL << (nr & 31)) & (((const volatile unsigned int *) addr)[nr >> 5])) != 0;
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+}
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+
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+extern __inline__ int __test_bit(int nr, volatile void * addr)
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+{
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+ int * a = (int *) addr;
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+ int mask;
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+
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+ a += nr >> 5;
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+ mask = 1 << (nr & 0x1f);
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+ return ((mask & *a) != 0);
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+}
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+
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+#define test_bit(nr,addr) \
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+(__builtin_constant_p(nr) ? \
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+ __constant_test_bit((nr),(addr)) : \
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+ __test_bit((nr),(addr)))
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+
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+#define find_first_zero_bit(addr, size) \
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+ find_next_zero_bit((addr), (size), 0)
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+
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+extern __inline__ int find_next_zero_bit (void * addr, int size, int offset)
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+{
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+ unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
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+ unsigned long result = offset & ~31UL;
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+ unsigned long tmp;
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+
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+ if (offset >= size)
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+ return size;
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+ size -= result;
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+ offset &= 31UL;
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+ if (offset) {
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+ tmp = *(p++);
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+ tmp |= ~0UL >> (32-offset);
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+ if (size < 32)
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+ goto found_first;
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+ if (~tmp)
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+ goto found_middle;
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+ size -= 32;
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+ result += 32;
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+ }
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+ while (size & ~31UL) {
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+ if (~(tmp = *(p++)))
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+ goto found_middle;
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+ result += 32;
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+ size -= 32;
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+ }
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+ if (!size)
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+ return result;
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+ tmp = *p;
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+
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+found_first:
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+ tmp |= ~0UL >> size;
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+found_middle:
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+ return result + ffz(tmp);
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+}
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+
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+#define ffs(x) generic_ffs(x)
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+
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+/*
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+ * hweightN: returns the hamming weight (i.e. the number
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+ * of bits set) of a N-bit word
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+ */
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+
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+#define hweight32(x) generic_hweight32(x)
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+#define hweight16(x) generic_hweight16(x)
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+#define hweight8(x) generic_hweight8(x)
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+
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+
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+extern __inline__ int ext2_set_bit(int nr, volatile void * addr)
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+{
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+ int mask, retval;
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+ unsigned long flags;
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+ volatile unsigned char *ADDR = (unsigned char *) addr;
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+
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+ ADDR += nr >> 3;
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+ mask = 1 << (nr & 0x07);
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+ save_flags_cli(flags);
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+ retval = (mask & *ADDR) != 0;
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+ *ADDR |= mask;
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+ restore_flags(flags);
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+ return retval;
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+}
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+
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+extern __inline__ int ext2_clear_bit(int nr, volatile void * addr)
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+{
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+ int mask, retval;
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+ unsigned long flags;
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+ volatile unsigned char *ADDR = (unsigned char *) addr;
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+
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+ ADDR += nr >> 3;
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+ mask = 1 << (nr & 0x07);
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+ save_flags_cli(flags);
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+ retval = (mask & *ADDR) != 0;
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+ *ADDR &= ~mask;
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+ restore_flags(flags);
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+ return retval;
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+}
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+
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+extern __inline__ int ext2_test_bit(int nr, const volatile void * addr)
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+{
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+ int mask;
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+ const volatile unsigned char *ADDR = (const unsigned char *) addr;
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+
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+ ADDR += nr >> 3;
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+ mask = 1 << (nr & 0x07);
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+ return ((mask & *ADDR) != 0);
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+}
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+
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+#define ext2_find_first_zero_bit(addr, size) \
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+ ext2_find_next_zero_bit((addr), (size), 0)
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+
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+extern __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
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+{
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+ unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
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+ unsigned long result = offset & ~31UL;
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+ unsigned long tmp;
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+
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+ if (offset >= size)
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+ return size;
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+ size -= result;
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+ offset &= 31UL;
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+ if(offset) {
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+ /* We hold the little endian value in tmp, but then the
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+ * shift is illegal. So we could keep a big endian value
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+ * in tmp, like this:
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+ *
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+ * tmp = __swab32(*(p++));
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+ * tmp |= ~0UL >> (32-offset);
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+ *
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+ * but this would decrease preformance, so we change the
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+ * shift:
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+ */
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+ tmp = *(p++);
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+ tmp |= __swab32(~0UL >> (32-offset));
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+ if(size < 32)
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+ goto found_first;
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+ if(~tmp)
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+ goto found_middle;
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+ size -= 32;
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+ result += 32;
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+ }
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+ while(size & ~31UL) {
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+ if(~(tmp = *(p++)))
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+ goto found_middle;
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+ result += 32;
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+ size -= 32;
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+ }
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+ if(!size)
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+ return result;
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+ tmp = *p;
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+
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+found_first:
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+ /* tmp is little endian, so we would have to swab the shift,
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+ * see above. But then we have to swab tmp below for ffz, so
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+ * we might as well do this here.
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+ */
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+ return result + ffz(__swab32(tmp) | (~0UL << size));
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+found_middle:
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+ return result + ffz(__swab32(tmp));
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+}
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+
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+/* Bitmap functions for the minix filesystem. */
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+#define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
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+#define minix_set_bit(nr,addr) set_bit(nr,addr)
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+#define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
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+#define minix_test_bit(nr,addr) test_bit(nr,addr)
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+#define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
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+
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+/**
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+ * hweightN - returns the hamming weight of a N-bit word
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+ * @x: the word to weigh
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+ *
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+ * The Hamming Weight of a number is the total number of bits set in it.
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+ */
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+
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+#define hweight32(x) generic_hweight32(x)
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+#define hweight16(x) generic_hweight16(x)
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+#define hweight8(x) generic_hweight8(x)
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+
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+#endif /* __KERNEL__ */
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+
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+#endif /* _MICROBLAZE_BITOPS_H */
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