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-rw-r--r--arch/arc/include/asm/bitops.h378
1 files changed, 378 insertions, 0 deletions
diff --git a/arch/arc/include/asm/bitops.h b/arch/arc/include/asm/bitops.h
new file mode 100644
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+++ b/arch/arc/include/asm/bitops.h
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ */
+
+#ifndef _ASM_BITOPS_H
+#define _ASM_BITOPS_H
+
+#ifndef _LINUX_BITOPS_H
+#error only <linux/bitops.h> can be included directly
+#endif
+
+#ifndef __ASSEMBLY__
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <asm/barrier.h>
+#ifndef CONFIG_ARC_HAS_LLSC
+#include <asm/smp.h>
+#endif
+
+#ifdef CONFIG_ARC_HAS_LLSC
+
+/*
+ * Hardware assisted Atomic-R-M-W
+ */
+
+#define BIT_OP(op, c_op, asm_op) \
+static inline void op##_bit(unsigned long nr, volatile unsigned long *m)\
+{ \
+ unsigned int temp; \
+ \
+ m += nr >> 5; \
+ \
+ nr &= 0x1f; \
+ \
+ __asm__ __volatile__( \
+ "1: llock %0, [%1] \n" \
+ " " #asm_op " %0, %0, %2 \n" \
+ " scond %0, [%1] \n" \
+ " bnz 1b \n" \
+ : "=&r"(temp) /* Early clobber, to prevent reg reuse */ \
+ : "r"(m), /* Not "m": llock only supports reg direct addr mode */ \
+ "ir"(nr) \
+ : "cc"); \
+}
+
+/*
+ * Semantically:
+ * Test the bit
+ * if clear
+ * set it and return 0 (old value)
+ * else
+ * return 1 (old value).
+ *
+ * Since ARC lacks a equivalent h/w primitive, the bit is set unconditionally
+ * and the old value of bit is returned
+ */
+#define TEST_N_BIT_OP(op, c_op, asm_op) \
+static inline int test_and_##op##_bit(unsigned long nr, volatile unsigned long *m)\
+{ \
+ unsigned long old, temp; \
+ \
+ m += nr >> 5; \
+ \
+ nr &= 0x1f; \
+ \
+ /* \
+ * Explicit full memory barrier needed before/after as \
+ * LLOCK/SCOND themselves don't provide any such smenatic \
+ */ \
+ smp_mb(); \
+ \
+ __asm__ __volatile__( \
+ "1: llock %0, [%2] \n" \
+ " " #asm_op " %1, %0, %3 \n" \
+ " scond %1, [%2] \n" \
+ " bnz 1b \n" \
+ : "=&r"(old), "=&r"(temp) \
+ : "r"(m), "ir"(nr) \
+ : "cc"); \
+ \
+ smp_mb(); \
+ \
+ return (old & (1 << nr)) != 0; \
+}
+
+#else /* !CONFIG_ARC_HAS_LLSC */
+
+/*
+ * Non hardware assisted Atomic-R-M-W
+ * Locking would change to irq-disabling only (UP) and spinlocks (SMP)
+ *
+ * There's "significant" micro-optimization in writing our own variants of
+ * bitops (over generic variants)
+ *
+ * (1) The generic APIs have "signed" @nr while we have it "unsigned"
+ * This avoids extra code to be generated for pointer arithmatic, since
+ * is "not sure" that index is NOT -ve
+ * (2) Utilize the fact that ARCompact bit fidding insn (BSET/BCLR/ASL) etc
+ * only consider bottom 5 bits of @nr, so NO need to mask them off.
+ * (GCC Quirk: however for constant @nr we still need to do the masking
+ * at compile time)
+ */
+
+#define BIT_OP(op, c_op, asm_op) \
+static inline void op##_bit(unsigned long nr, volatile unsigned long *m)\
+{ \
+ unsigned long temp, flags; \
+ m += nr >> 5; \
+ \
+ /* \
+ * spin lock/unlock provide the needed smp_mb() before/after \
+ */ \
+ bitops_lock(flags); \
+ \
+ temp = *m; \
+ *m = temp c_op (1UL << (nr & 0x1f)); \
+ \
+ bitops_unlock(flags); \
+}
+
+#define TEST_N_BIT_OP(op, c_op, asm_op) \
+static inline int test_and_##op##_bit(unsigned long nr, volatile unsigned long *m)\
+{ \
+ unsigned long old, flags; \
+ m += nr >> 5; \
+ \
+ bitops_lock(flags); \
+ \
+ old = *m; \
+ *m = old c_op (1UL << (nr & 0x1f)); \
+ \
+ bitops_unlock(flags); \
+ \
+ return (old & (1UL << (nr & 0x1f))) != 0; \
+}
+
+#endif
+
+/***************************************
+ * Non atomic variants
+ **************************************/
+
+#define __BIT_OP(op, c_op, asm_op) \
+static inline void __##op##_bit(unsigned long nr, volatile unsigned long *m) \
+{ \
+ unsigned long temp; \
+ m += nr >> 5; \
+ \
+ temp = *m; \
+ *m = temp c_op (1UL << (nr & 0x1f)); \
+}
+
+#define __TEST_N_BIT_OP(op, c_op, asm_op) \
+static inline int __test_and_##op##_bit(unsigned long nr, volatile unsigned long *m)\
+{ \
+ unsigned long old; \
+ m += nr >> 5; \
+ \
+ old = *m; \
+ *m = old c_op (1UL << (nr & 0x1f)); \
+ \
+ return (old & (1UL << (nr & 0x1f))) != 0; \
+}
+
+#define BIT_OPS(op, c_op, asm_op) \
+ \
+ /* set_bit(), clear_bit(), change_bit() */ \
+ BIT_OP(op, c_op, asm_op) \
+ \
+ /* test_and_set_bit(), test_and_clear_bit(), test_and_change_bit() */\
+ TEST_N_BIT_OP(op, c_op, asm_op) \
+ \
+ /* __set_bit(), __clear_bit(), __change_bit() */ \
+ __BIT_OP(op, c_op, asm_op) \
+ \
+ /* __test_and_set_bit(), __test_and_clear_bit(), __test_and_change_bit() */\
+ __TEST_N_BIT_OP(op, c_op, asm_op)
+
+BIT_OPS(set, |, bset)
+BIT_OPS(clear, & ~, bclr)
+BIT_OPS(change, ^, bxor)
+
+/*
+ * This routine doesn't need to be atomic.
+ */
+static inline int
+test_bit(unsigned int nr, const volatile unsigned long *addr)
+{
+ unsigned long mask;
+
+ addr += nr >> 5;
+
+ mask = 1UL << (nr & 0x1f);
+
+ return ((mask & *addr) != 0);
+}
+
+#ifdef CONFIG_ISA_ARCOMPACT
+
+/*
+ * Count the number of zeros, starting from MSB
+ * Helper for fls( ) friends
+ * This is a pure count, so (1-32) or (0-31) doesn't apply
+ * It could be 0 to 32, based on num of 0's in there
+ * clz(0x8000_0000) = 0, clz(0xFFFF_FFFF)=0, clz(0) = 32, clz(1) = 31
+ */
+static inline __attribute__ ((const)) int clz(unsigned int x)
+{
+ unsigned int res;
+
+ __asm__ __volatile__(
+ " norm.f %0, %1 \n"
+ " mov.n %0, 0 \n"
+ " add.p %0, %0, 1 \n"
+ : "=r"(res)
+ : "r"(x)
+ : "cc");
+
+ return res;
+}
+
+static inline int constant_fls(unsigned int x)
+{
+ int r = 32;
+
+ if (!x)
+ return 0;
+ if (!(x & 0xffff0000u)) {
+ x <<= 16;
+ r -= 16;
+ }
+ if (!(x & 0xff000000u)) {
+ x <<= 8;
+ r -= 8;
+ }
+ if (!(x & 0xf0000000u)) {
+ x <<= 4;
+ r -= 4;
+ }
+ if (!(x & 0xc0000000u)) {
+ x <<= 2;
+ r -= 2;
+ }
+ if (!(x & 0x80000000u))
+ r -= 1;
+ return r;
+}
+
+/*
+ * fls = Find Last Set in word
+ * @result: [1-32]
+ * fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0
+ */
+static inline __attribute__ ((const)) int fls(unsigned int x)
+{
+ if (__builtin_constant_p(x))
+ return constant_fls(x);
+
+ return 32 - clz(x);
+}
+
+/*
+ * __fls: Similar to fls, but zero based (0-31)
+ */
+static inline __attribute__ ((const)) int __fls(unsigned long x)
+{
+ if (!x)
+ return 0;
+ else
+ return fls(x) - 1;
+}
+
+/*
+ * ffs = Find First Set in word (LSB to MSB)
+ * @result: [1-32], 0 if all 0's
+ */
+#define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
+
+/*
+ * __ffs: Similar to ffs, but zero based (0-31)
+ */
+static inline __attribute__ ((const)) unsigned long __ffs(unsigned long word)
+{
+ if (!word)
+ return word;
+
+ return ffs(word) - 1;
+}
+
+#else /* CONFIG_ISA_ARCV2 */
+
+/*
+ * fls = Find Last Set in word
+ * @result: [1-32]
+ * fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0
+ */
+static inline __attribute__ ((const)) int fls(unsigned long x)
+{
+ int n;
+
+ asm volatile(
+ " fls.f %0, %1 \n" /* 0:31; 0(Z) if src 0 */
+ " add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */
+ : "=r"(n) /* Early clobber not needed */
+ : "r"(x)
+ : "cc");
+
+ return n;
+}
+
+/*
+ * __fls: Similar to fls, but zero based (0-31). Also 0 if no bit set
+ */
+static inline __attribute__ ((const)) int __fls(unsigned long x)
+{
+ /* FLS insn has exactly same semantics as the API */
+ return __builtin_arc_fls(x);
+}
+
+/*
+ * ffs = Find First Set in word (LSB to MSB)
+ * @result: [1-32], 0 if all 0's
+ */
+static inline __attribute__ ((const)) int ffs(unsigned long x)
+{
+ int n;
+
+ asm volatile(
+ " ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */
+ " add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */
+ " mov.z %0, 0 \n" /* 31(Z)-> 0 */
+ : "=r"(n) /* Early clobber not needed */
+ : "r"(x)
+ : "cc");
+
+ return n;
+}
+
+/*
+ * __ffs: Similar to ffs, but zero based (0-31)
+ */
+static inline __attribute__ ((const)) unsigned long __ffs(unsigned long x)
+{
+ unsigned long n;
+
+ asm volatile(
+ " ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */
+ " mov.z %0, 0 \n" /* 31(Z)-> 0 */
+ : "=r"(n)
+ : "r"(x)
+ : "cc");
+
+ return n;
+
+}
+
+#endif /* CONFIG_ISA_ARCOMPACT */
+
+/*
+ * ffz = Find First Zero in word.
+ * @return:[0-31], 32 if all 1's
+ */
+#define ffz(x) __ffs(~(x))
+
+#include <asm-generic/bitops/hweight.h>
+#include <asm-generic/bitops/fls64.h>
+#include <asm-generic/bitops/sched.h>
+#include <asm-generic/bitops/lock.h>
+
+#include <asm-generic/bitops/find.h>
+#include <asm-generic/bitops/le.h>
+#include <asm-generic/bitops/ext2-atomic-setbit.h>
+
+#endif /* !__ASSEMBLY__ */
+
+#endif
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