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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/ia64/include/asm/bitops.h
Initial import
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diff --git a/arch/ia64/include/asm/bitops.h b/arch/ia64/include/asm/bitops.h
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+#ifndef _ASM_IA64_BITOPS_H
+#define _ASM_IA64_BITOPS_H
+
+/*
+ * Copyright (C) 1998-2003 Hewlett-Packard Co
+ * David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * 02/06/02 find_next_bit() and find_first_bit() added from Erich Focht's ia64
+ * O(1) scheduler patch
+ */
+
+#ifndef _LINUX_BITOPS_H
+#error only <linux/bitops.h> can be included directly
+#endif
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/intrinsics.h>
+#include <asm/barrier.h>
+
+/**
+ * set_bit - Atomically set a bit in memory
+ * @nr: the bit to set
+ * @addr: the address to start counting from
+ *
+ * This function is atomic and may not be reordered. See __set_bit()
+ * if you do not require the atomic guarantees.
+ * Note that @nr may be almost arbitrarily large; this function is not
+ * restricted to acting on a single-word quantity.
+ *
+ * The address must be (at least) "long" aligned.
+ * Note that there are driver (e.g., eepro100) which use these operations to
+ * operate on hw-defined data-structures, so we can't easily change these
+ * operations to force a bigger alignment.
+ *
+ * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1).
+ */
+static __inline__ void
+set_bit (int nr, volatile void *addr)
+{
+ __u32 bit, old, new;
+ volatile __u32 *m;
+ CMPXCHG_BUGCHECK_DECL
+
+ m = (volatile __u32 *) addr + (nr >> 5);
+ bit = 1 << (nr & 31);
+ do {
+ CMPXCHG_BUGCHECK(m);
+ old = *m;
+ new = old | bit;
+ } while (cmpxchg_acq(m, old, new) != old);
+}
+
+/**
+ * __set_bit - Set a bit in memory
+ * @nr: the bit to set
+ * @addr: the address to start counting from
+ *
+ * Unlike set_bit(), this function is non-atomic and may be reordered.
+ * If it's called on the same region of memory simultaneously, the effect
+ * may be that only one operation succeeds.
+ */
+static __inline__ void
+__set_bit (int nr, volatile void *addr)
+{
+ *((__u32 *) addr + (nr >> 5)) |= (1 << (nr & 31));
+}
+
+/**
+ * clear_bit - Clears a bit in memory
+ * @nr: Bit to clear
+ * @addr: Address to start counting from
+ *
+ * clear_bit() is atomic and may not be reordered. However, it does
+ * not contain a memory barrier, so if it is used for locking purposes,
+ * you should call smp_mb__before_atomic() and/or smp_mb__after_atomic()
+ * in order to ensure changes are visible on other processors.
+ */
+static __inline__ void
+clear_bit (int nr, volatile void *addr)
+{
+ __u32 mask, old, new;
+ volatile __u32 *m;
+ CMPXCHG_BUGCHECK_DECL
+
+ m = (volatile __u32 *) addr + (nr >> 5);
+ mask = ~(1 << (nr & 31));
+ do {
+ CMPXCHG_BUGCHECK(m);
+ old = *m;
+ new = old & mask;
+ } while (cmpxchg_acq(m, old, new) != old);
+}
+
+/**
+ * clear_bit_unlock - Clears a bit in memory with release
+ * @nr: Bit to clear
+ * @addr: Address to start counting from
+ *
+ * clear_bit_unlock() is atomic and may not be reordered. It does
+ * contain a memory barrier suitable for unlock type operations.
+ */
+static __inline__ void
+clear_bit_unlock (int nr, volatile void *addr)
+{
+ __u32 mask, old, new;
+ volatile __u32 *m;
+ CMPXCHG_BUGCHECK_DECL
+
+ m = (volatile __u32 *) addr + (nr >> 5);
+ mask = ~(1 << (nr & 31));
+ do {
+ CMPXCHG_BUGCHECK(m);
+ old = *m;
+ new = old & mask;
+ } while (cmpxchg_rel(m, old, new) != old);
+}
+
+/**
+ * __clear_bit_unlock - Non-atomically clears a bit in memory with release
+ * @nr: Bit to clear
+ * @addr: Address to start counting from
+ *
+ * Similarly to clear_bit_unlock, the implementation uses a store
+ * with release semantics. See also arch_spin_unlock().
+ */
+static __inline__ void
+__clear_bit_unlock(int nr, void *addr)
+{
+ __u32 * const m = (__u32 *) addr + (nr >> 5);
+ __u32 const new = *m & ~(1 << (nr & 31));
+
+ ia64_st4_rel_nta(m, new);
+}
+
+/**
+ * __clear_bit - Clears a bit in memory (non-atomic version)
+ * @nr: the bit to clear
+ * @addr: the address to start counting from
+ *
+ * Unlike clear_bit(), this function is non-atomic and may be reordered.
+ * If it's called on the same region of memory simultaneously, the effect
+ * may be that only one operation succeeds.
+ */
+static __inline__ void
+__clear_bit (int nr, volatile void *addr)
+{
+ *((__u32 *) addr + (nr >> 5)) &= ~(1 << (nr & 31));
+}
+
+/**
+ * change_bit - Toggle a bit in memory
+ * @nr: Bit to toggle
+ * @addr: Address to start counting from
+ *
+ * change_bit() is atomic and may not be reordered.
+ * Note that @nr may be almost arbitrarily large; this function is not
+ * restricted to acting on a single-word quantity.
+ */
+static __inline__ void
+change_bit (int nr, volatile void *addr)
+{
+ __u32 bit, old, new;
+ volatile __u32 *m;
+ CMPXCHG_BUGCHECK_DECL
+
+ m = (volatile __u32 *) addr + (nr >> 5);
+ bit = (1 << (nr & 31));
+ do {
+ CMPXCHG_BUGCHECK(m);
+ old = *m;
+ new = old ^ bit;
+ } while (cmpxchg_acq(m, old, new) != old);
+}
+
+/**
+ * __change_bit - Toggle a bit in memory
+ * @nr: the bit to toggle
+ * @addr: the address to start counting from
+ *
+ * Unlike change_bit(), this function is non-atomic and may be reordered.
+ * If it's called on the same region of memory simultaneously, the effect
+ * may be that only one operation succeeds.
+ */
+static __inline__ void
+__change_bit (int nr, volatile void *addr)
+{
+ *((__u32 *) addr + (nr >> 5)) ^= (1 << (nr & 31));
+}
+
+/**
+ * test_and_set_bit - Set a bit and return its old value
+ * @nr: Bit to set
+ * @addr: Address to count from
+ *
+ * This operation is atomic and cannot be reordered.
+ * It also implies the acquisition side of the memory barrier.
+ */
+static __inline__ int
+test_and_set_bit (int nr, volatile void *addr)
+{
+ __u32 bit, old, new;
+ volatile __u32 *m;
+ CMPXCHG_BUGCHECK_DECL
+
+ m = (volatile __u32 *) addr + (nr >> 5);
+ bit = 1 << (nr & 31);
+ do {
+ CMPXCHG_BUGCHECK(m);
+ old = *m;
+ new = old | bit;
+ } while (cmpxchg_acq(m, old, new) != old);
+ return (old & bit) != 0;
+}
+
+/**
+ * test_and_set_bit_lock - Set a bit and return its old value for lock
+ * @nr: Bit to set
+ * @addr: Address to count from
+ *
+ * This is the same as test_and_set_bit on ia64
+ */
+#define test_and_set_bit_lock test_and_set_bit
+
+/**
+ * __test_and_set_bit - Set a bit and return its old value
+ * @nr: Bit to set
+ * @addr: Address to count from
+ *
+ * This operation is non-atomic and can be reordered.
+ * If two examples of this operation race, one can appear to succeed
+ * but actually fail. You must protect multiple accesses with a lock.
+ */
+static __inline__ int
+__test_and_set_bit (int nr, volatile void *addr)
+{
+ __u32 *p = (__u32 *) addr + (nr >> 5);
+ __u32 m = 1 << (nr & 31);
+ int oldbitset = (*p & m) != 0;
+
+ *p |= m;
+ return oldbitset;
+}
+
+/**
+ * test_and_clear_bit - Clear a bit and return its old value
+ * @nr: Bit to clear
+ * @addr: Address to count from
+ *
+ * This operation is atomic and cannot be reordered.
+ * It also implies the acquisition side of the memory barrier.
+ */
+static __inline__ int
+test_and_clear_bit (int nr, volatile void *addr)
+{
+ __u32 mask, old, new;
+ volatile __u32 *m;
+ CMPXCHG_BUGCHECK_DECL
+
+ m = (volatile __u32 *) addr + (nr >> 5);
+ mask = ~(1 << (nr & 31));
+ do {
+ CMPXCHG_BUGCHECK(m);
+ old = *m;
+ new = old & mask;
+ } while (cmpxchg_acq(m, old, new) != old);
+ return (old & ~mask) != 0;
+}
+
+/**
+ * __test_and_clear_bit - Clear a bit and return its old value
+ * @nr: Bit to clear
+ * @addr: Address to count from
+ *
+ * This operation is non-atomic and can be reordered.
+ * If two examples of this operation race, one can appear to succeed
+ * but actually fail. You must protect multiple accesses with a lock.
+ */
+static __inline__ int
+__test_and_clear_bit(int nr, volatile void * addr)
+{
+ __u32 *p = (__u32 *) addr + (nr >> 5);
+ __u32 m = 1 << (nr & 31);
+ int oldbitset = (*p & m) != 0;
+
+ *p &= ~m;
+ return oldbitset;
+}
+
+/**
+ * test_and_change_bit - Change a bit and return its old value
+ * @nr: Bit to change
+ * @addr: Address to count from
+ *
+ * This operation is atomic and cannot be reordered.
+ * It also implies the acquisition side of the memory barrier.
+ */
+static __inline__ int
+test_and_change_bit (int nr, volatile void *addr)
+{
+ __u32 bit, old, new;
+ volatile __u32 *m;
+ CMPXCHG_BUGCHECK_DECL
+
+ m = (volatile __u32 *) addr + (nr >> 5);
+ bit = (1 << (nr & 31));
+ do {
+ CMPXCHG_BUGCHECK(m);
+ old = *m;
+ new = old ^ bit;
+ } while (cmpxchg_acq(m, old, new) != old);
+ return (old & bit) != 0;
+}
+
+/**
+ * __test_and_change_bit - Change a bit and return its old value
+ * @nr: Bit to change
+ * @addr: Address to count from
+ *
+ * This operation is non-atomic and can be reordered.
+ */
+static __inline__ int
+__test_and_change_bit (int nr, void *addr)
+{
+ __u32 old, bit = (1 << (nr & 31));
+ __u32 *m = (__u32 *) addr + (nr >> 5);
+
+ old = *m;
+ *m = old ^ bit;
+ return (old & bit) != 0;
+}
+
+static __inline__ int
+test_bit (int nr, const volatile void *addr)
+{
+ return 1 & (((const volatile __u32 *) addr)[nr >> 5] >> (nr & 31));
+}
+
+/**
+ * ffz - find the first zero bit in a long word
+ * @x: The long word to find the bit in
+ *
+ * Returns the bit-number (0..63) of the first (least significant) zero bit.
+ * Undefined if no zero exists, so code should check against ~0UL first...
+ */
+static inline unsigned long
+ffz (unsigned long x)
+{
+ unsigned long result;
+
+ result = ia64_popcnt(x & (~x - 1));
+ return result;
+}
+
+/**
+ * __ffs - find first bit in word.
+ * @x: The word to search
+ *
+ * Undefined if no bit exists, so code should check against 0 first.
+ */
+static __inline__ unsigned long
+__ffs (unsigned long x)
+{
+ unsigned long result;
+
+ result = ia64_popcnt((x-1) & ~x);
+ return result;
+}
+
+#ifdef __KERNEL__
+
+/*
+ * Return bit number of last (most-significant) bit set. Undefined
+ * for x==0. Bits are numbered from 0..63 (e.g., ia64_fls(9) == 3).
+ */
+static inline unsigned long
+ia64_fls (unsigned long x)
+{
+ long double d = x;
+ long exp;
+
+ exp = ia64_getf_exp(d);
+ return exp - 0xffff;
+}
+
+/*
+ * Find the last (most significant) bit set. Returns 0 for x==0 and
+ * bits are numbered from 1..32 (e.g., fls(9) == 4).
+ */
+static inline int
+fls (int t)
+{
+ unsigned long x = t & 0xffffffffu;
+
+ if (!x)
+ return 0;
+ x |= x >> 1;
+ x |= x >> 2;
+ x |= x >> 4;
+ x |= x >> 8;
+ x |= x >> 16;
+ return ia64_popcnt(x);
+}
+
+/*
+ * Find the last (most significant) bit set. Undefined for x==0.
+ * Bits are numbered from 0..63 (e.g., __fls(9) == 3).
+ */
+static inline unsigned long
+__fls (unsigned long x)
+{
+ x |= x >> 1;
+ x |= x >> 2;
+ x |= x >> 4;
+ x |= x >> 8;
+ x |= x >> 16;
+ x |= x >> 32;
+ return ia64_popcnt(x) - 1;
+}
+
+#include <asm-generic/bitops/fls64.h>
+
+#include <asm-generic/bitops/builtin-ffs.h>
+
+/*
+ * hweightN: returns the hamming weight (i.e. the number
+ * of bits set) of a N-bit word
+ */
+static __inline__ unsigned long __arch_hweight64(unsigned long x)
+{
+ unsigned long result;
+ result = ia64_popcnt(x);
+ return result;
+}
+
+#define __arch_hweight32(x) ((unsigned int) __arch_hweight64((x) & 0xfffffffful))
+#define __arch_hweight16(x) ((unsigned int) __arch_hweight64((x) & 0xfffful))
+#define __arch_hweight8(x) ((unsigned int) __arch_hweight64((x) & 0xfful))
+
+#include <asm-generic/bitops/const_hweight.h>
+
+#endif /* __KERNEL__ */
+
+#include <asm-generic/bitops/find.h>
+
+#ifdef __KERNEL__
+
+#include <asm-generic/bitops/le.h>
+
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
+
+#include <asm-generic/bitops/sched.h>
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_IA64_BITOPS_H */