1 files changed, 378 insertions, 0 deletions
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h
new file mode 100644
index 0000000000..2de74fcd05
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+++ b/arch/s390/include/asm/bitops.h
@@ -0,0 +1,378 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *    Copyright IBM Corp. 1999,2013
+ *
+ *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ *
+ * The description below was taken in large parts from the powerpc
+ * bitops header file:
+ * Within a word, bits are numbered LSB first.  Lot's of places make
+ * this assumption by directly testing bits with (val & (1<<nr)).
+ * This can cause confusion for large (> 1 word) bitmaps on a
+ * big-endian system because, unlike little endian, the number of each
+ * bit depends on the word size.
+ *
+ * The bitop functions are defined to work on unsigned longs, so the bits
+ * end up numbered:
+ *   |63..............0|127............64|191...........128|255...........192|
+ *
+ * We also have special functions which work with an MSB0 encoding.
+ * The bits are numbered:
+ *   |0..............63|64............127|128...........191|192...........255|
+ *
+ * The main difference is that bit 0-63 in the bit number field needs to be
+ * reversed compared to the LSB0 encoded bit fields. This can be achieved by
+ * XOR with 0x3f.
+ *
+ */
+
+#ifndef _S390_BITOPS_H
+#define _S390_BITOPS_H
+
+#ifndef _LINUX_BITOPS_H
+#error only <linux/bitops.h> can be included directly
+#endif
+
+#include <linux/typecheck.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/atomic_ops.h>
+#include <asm/barrier.h>
+
+#define __BITOPS_WORDS(bits) (((bits) + BITS_PER_LONG - 1) / BITS_PER_LONG)
+
+static inline unsigned long *
+__bitops_word(unsigned long nr, const volatile unsigned long *ptr)
+{
+	unsigned long addr;
+
+	addr = (unsigned long)ptr + ((nr ^ (nr & (BITS_PER_LONG - 1))) >> 3);
+	return (unsigned long *)addr;
+}
+
+static inline unsigned long __bitops_mask(unsigned long nr)
+{
+	return 1UL << (nr & (BITS_PER_LONG - 1));
+}
+
+static __always_inline void arch_set_bit(unsigned long nr, volatile unsigned long *ptr)
+{
+	unsigned long *addr = __bitops_word(nr, ptr);
+	unsigned long mask = __bitops_mask(nr);
+
+	__atomic64_or(mask, (long *)addr);
+}
+
+static __always_inline void arch_clear_bit(unsigned long nr, volatile unsigned long *ptr)
+{
+	unsigned long *addr = __bitops_word(nr, ptr);
+	unsigned long mask = __bitops_mask(nr);
+
+	__atomic64_and(~mask, (long *)addr);
+}
+
+static __always_inline void arch_change_bit(unsigned long nr,
+					    volatile unsigned long *ptr)
+{
+	unsigned long *addr = __bitops_word(nr, ptr);
+	unsigned long mask = __bitops_mask(nr);
+
+	__atomic64_xor(mask, (long *)addr);
+}
+
+static inline bool arch_test_and_set_bit(unsigned long nr,
+					 volatile unsigned long *ptr)
+{
+	unsigned long *addr = __bitops_word(nr, ptr);
+	unsigned long mask = __bitops_mask(nr);
+	unsigned long old;
+
+	old = __atomic64_or_barrier(mask, (long *)addr);
+	return old & mask;
+}
+
+static inline bool arch_test_and_clear_bit(unsigned long nr,
+					   volatile unsigned long *ptr)
+{
+	unsigned long *addr = __bitops_word(nr, ptr);
+	unsigned long mask = __bitops_mask(nr);
+	unsigned long old;
+
+	old = __atomic64_and_barrier(~mask, (long *)addr);
+	return old & mask;
+}
+
+static inline bool arch_test_and_change_bit(unsigned long nr,
+					    volatile unsigned long *ptr)
+{
+	unsigned long *addr = __bitops_word(nr, ptr);
+	unsigned long mask = __bitops_mask(nr);
+	unsigned long old;
+
+	old = __atomic64_xor_barrier(mask, (long *)addr);
+	return old & mask;
+}
+
+static __always_inline void
+arch___set_bit(unsigned long nr, volatile unsigned long *addr)
+{
+	unsigned long *p = __bitops_word(nr, addr);
+	unsigned long mask = __bitops_mask(nr);
+
+	*p |= mask;
+}
+
+static __always_inline void
+arch___clear_bit(unsigned long nr, volatile unsigned long *addr)
+{
+	unsigned long *p = __bitops_word(nr, addr);
+	unsigned long mask = __bitops_mask(nr);
+
+	*p &= ~mask;
+}
+
+static __always_inline void
+arch___change_bit(unsigned long nr, volatile unsigned long *addr)
+{
+	unsigned long *p = __bitops_word(nr, addr);
+	unsigned long mask = __bitops_mask(nr);
+
+	*p ^= mask;
+}
+
+static __always_inline bool
+arch___test_and_set_bit(unsigned long nr, volatile unsigned long *addr)
+{
+	unsigned long *p = __bitops_word(nr, addr);
+	unsigned long mask = __bitops_mask(nr);
+	unsigned long old;
+
+	old = *p;
+	*p |= mask;
+	return old & mask;
+}
+
+static __always_inline bool
+arch___test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
+{
+	unsigned long *p = __bitops_word(nr, addr);
+	unsigned long mask = __bitops_mask(nr);
+	unsigned long old;
+
+	old = *p;
+	*p &= ~mask;
+	return old & mask;
+}
+
+static __always_inline bool
+arch___test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
+{
+	unsigned long *p = __bitops_word(nr, addr);
+	unsigned long mask = __bitops_mask(nr);
+	unsigned long old;
+
+	old = *p;
+	*p ^= mask;
+	return old & mask;
+}
+
+#define arch_test_bit generic_test_bit
+#define arch_test_bit_acquire generic_test_bit_acquire
+
+static inline bool arch_test_and_set_bit_lock(unsigned long nr,
+					      volatile unsigned long *ptr)
+{
+	if (arch_test_bit(nr, ptr))
+		return true;
+	return arch_test_and_set_bit(nr, ptr);
+}
+
+static inline void arch_clear_bit_unlock(unsigned long nr,
+					 volatile unsigned long *ptr)
+{
+	smp_mb__before_atomic();
+	arch_clear_bit(nr, ptr);
+}
+
+static inline void arch___clear_bit_unlock(unsigned long nr,
+					   volatile unsigned long *ptr)
+{
+	smp_mb();
+	arch___clear_bit(nr, ptr);
+}
+
+#include <asm-generic/bitops/instrumented-atomic.h>
+#include <asm-generic/bitops/instrumented-non-atomic.h>
+#include <asm-generic/bitops/instrumented-lock.h>
+
+/*
+ * Functions which use MSB0 bit numbering.
+ * The bits are numbered:
+ *   |0..............63|64............127|128...........191|192...........255|
+ */
+unsigned long find_first_bit_inv(const unsigned long *addr, unsigned long size);
+unsigned long find_next_bit_inv(const unsigned long *addr, unsigned long size,
+				unsigned long offset);
+
+#define for_each_set_bit_inv(bit, addr, size)				\
+	for ((bit) = find_first_bit_inv((addr), (size));		\
+	     (bit) < (size);						\
+	     (bit) = find_next_bit_inv((addr), (size), (bit) + 1))
+
+static inline void set_bit_inv(unsigned long nr, volatile unsigned long *ptr)
+{
+	return set_bit(nr ^ (BITS_PER_LONG - 1), ptr);
+}
+
+static inline void clear_bit_inv(unsigned long nr, volatile unsigned long *ptr)
+{
+	return clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
+}
+
+static inline bool test_and_clear_bit_inv(unsigned long nr,
+					  volatile unsigned long *ptr)
+{
+	return test_and_clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
+}
+
+static inline void __set_bit_inv(unsigned long nr, volatile unsigned long *ptr)
+{
+	return __set_bit(nr ^ (BITS_PER_LONG - 1), ptr);
+}
+
+static inline void __clear_bit_inv(unsigned long nr, volatile unsigned long *ptr)
+{
+	return __clear_bit(nr ^ (BITS_PER_LONG - 1), ptr);
+}
+
+static inline bool test_bit_inv(unsigned long nr,
+				const volatile unsigned long *ptr)
+{
+	return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);
+}
+
+/**
+ * __flogr - find leftmost one
+ * @word - The word to search
+ *
+ * Returns the bit number of the most significant bit set,
+ * where the most significant bit has bit number 0.
+ * If no bit is set this function returns 64.
+ */
+static inline unsigned char __flogr(unsigned long word)
+{
+	if (__builtin_constant_p(word)) {
+		unsigned long bit = 0;
+
+		if (!word)
+			return 64;
+		if (!(word & 0xffffffff00000000UL)) {
+			word <<= 32;
+			bit += 32;
+		}
+		if (!(word & 0xffff000000000000UL)) {
+			word <<= 16;
+			bit += 16;
+		}
+		if (!(word & 0xff00000000000000UL)) {
+			word <<= 8;
+			bit += 8;
+		}
+		if (!(word & 0xf000000000000000UL)) {
+			word <<= 4;
+			bit += 4;
+		}
+		if (!(word & 0xc000000000000000UL)) {
+			word <<= 2;
+			bit += 2;
+		}
+		if (!(word & 0x8000000000000000UL)) {
+			word <<= 1;
+			bit += 1;
+		}
+		return bit;
+	} else {
+		union register_pair rp;
+
+		rp.even = word;
+		asm volatile(
+			"       flogr   %[rp],%[rp]\n"
+			: [rp] "+d" (rp.pair) : : "cc");
+		return rp.even;
+	}
+}
+
+/**
+ * __ffs - find first bit in word.
+ * @word: The word to search
+ *
+ * Undefined if no bit exists, so code should check against 0 first.
+ */
+static inline unsigned long __ffs(unsigned long word)
+{
+	return __flogr(-word & word) ^ (BITS_PER_LONG - 1);
+}
+
+/**
+ * ffs - find first bit set
+ * @word: the word to search
+ *
+ * This is defined the same way as the libc and
+ * compiler builtin ffs routines (man ffs).
+ */
+static inline int ffs(int word)
+{
+	unsigned long mask = 2 * BITS_PER_LONG - 1;
+	unsigned int val = (unsigned int)word;
+
+	return (1 + (__flogr(-val & val) ^ (BITS_PER_LONG - 1))) & mask;
+}
+
+/**
+ * __fls - find last (most-significant) set bit in a long word
+ * @word: the word to search
+ *
+ * Undefined if no set bit exists, so code should check against 0 first.
+ */
+static inline unsigned long __fls(unsigned long word)
+{
+	return __flogr(word) ^ (BITS_PER_LONG - 1);
+}
+
+/**
+ * fls64 - find last set bit in a 64-bit word
+ * @word: the word to search
+ *
+ * This is defined in a similar way as the libc and compiler builtin
+ * ffsll, but returns the position of the most significant set bit.
+ *
+ * fls64(value) returns 0 if value is 0 or the position of the last
+ * set bit if value is nonzero. The last (most significant) bit is
+ * at position 64.
+ */
+static inline int fls64(unsigned long word)
+{
+	unsigned long mask = 2 * BITS_PER_LONG - 1;
+
+	return (1 + (__flogr(word) ^ (BITS_PER_LONG - 1))) & mask;
+}
+
+/**
+ * fls - find last (most-significant) bit set
+ * @word: the word to search
+ *
+ * This is defined the same way as ffs.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+static inline int fls(unsigned int word)
+{
+	return fls64(word);
+}
+
+#include <asm-generic/bitops/ffz.h>
+#include <asm-generic/bitops/hweight.h>
+#include <asm-generic/bitops/sched.h>
+#include <asm-generic/bitops/le.h>
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
+
+#endif /* _S390_BITOPS_H */