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https://github.com/torvalds/linux.git
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510 lines
9.3 KiB
C
510 lines
9.3 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_BITOPS_H
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#define _ASM_BITOPS_H
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#ifndef _LINUX_BITOPS_H
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#error only <linux/bitops.h> can be included directly
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#endif
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <asm/barrier.h>
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/*
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* Hardware assisted read-modify-write using ARC700 LLOCK/SCOND insns.
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* The Kconfig glue ensures that in SMP, this is only set if the container
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* SoC/platform has cross-core coherent LLOCK/SCOND
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*/
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#if defined(CONFIG_ARC_HAS_LLSC)
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static inline void set_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned int temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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__asm__ __volatile__(
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"1: llock %0, [%1] \n"
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" bset %0, %0, %2 \n"
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" scond %0, [%1] \n"
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" bnz 1b \n"
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: "=&r"(temp)
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: "r"(m), "ir"(nr)
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: "cc");
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}
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static inline void clear_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned int temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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__asm__ __volatile__(
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"1: llock %0, [%1] \n"
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" bclr %0, %0, %2 \n"
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" scond %0, [%1] \n"
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" bnz 1b \n"
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: "=&r"(temp)
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: "r"(m), "ir"(nr)
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: "cc");
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}
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static inline void change_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned int temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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__asm__ __volatile__(
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"1: llock %0, [%1] \n"
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" bxor %0, %0, %2 \n"
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" scond %0, [%1] \n"
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" bnz 1b \n"
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: "=&r"(temp)
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: "r"(m), "ir"(nr)
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: "cc");
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}
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/*
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* Semantically:
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* Test the bit
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* if clear
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* set it and return 0 (old value)
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* else
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* return 1 (old value).
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*
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* Since ARC lacks a equivalent h/w primitive, the bit is set unconditionally
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* and the old value of bit is returned
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*/
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static inline int test_and_set_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long old, temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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__asm__ __volatile__(
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"1: llock %0, [%2] \n"
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" bset %1, %0, %3 \n"
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" scond %1, [%2] \n"
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" bnz 1b \n"
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: "=&r"(old), "=&r"(temp)
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: "r"(m), "ir"(nr)
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: "cc");
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return (old & (1 << nr)) != 0;
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}
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static inline int
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test_and_clear_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned int old, temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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__asm__ __volatile__(
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"1: llock %0, [%2] \n"
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" bclr %1, %0, %3 \n"
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" scond %1, [%2] \n"
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" bnz 1b \n"
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: "=&r"(old), "=&r"(temp)
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: "r"(m), "ir"(nr)
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: "cc");
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return (old & (1 << nr)) != 0;
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}
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static inline int
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test_and_change_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned int old, temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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__asm__ __volatile__(
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"1: llock %0, [%2] \n"
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" bxor %1, %0, %3 \n"
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" scond %1, [%2] \n"
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" bnz 1b \n"
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: "=&r"(old), "=&r"(temp)
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: "r"(m), "ir"(nr)
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: "cc");
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return (old & (1 << nr)) != 0;
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}
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#else /* !CONFIG_ARC_HAS_LLSC */
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#include <asm/smp.h>
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/*
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* Non hardware assisted Atomic-R-M-W
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* Locking would change to irq-disabling only (UP) and spinlocks (SMP)
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*
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* There's "significant" micro-optimization in writing our own variants of
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* bitops (over generic variants)
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*
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* (1) The generic APIs have "signed" @nr while we have it "unsigned"
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* This avoids extra code to be generated for pointer arithmatic, since
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* is "not sure" that index is NOT -ve
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* (2) Utilize the fact that ARCompact bit fidding insn (BSET/BCLR/ASL) etc
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* only consider bottom 5 bits of @nr, so NO need to mask them off.
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* (GCC Quirk: however for constant @nr we still need to do the masking
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* at compile time)
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*/
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static inline void set_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long temp, flags;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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bitops_lock(flags);
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temp = *m;
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*m = temp | (1UL << nr);
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bitops_unlock(flags);
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}
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static inline void clear_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long temp, flags;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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bitops_lock(flags);
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temp = *m;
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*m = temp & ~(1UL << nr);
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bitops_unlock(flags);
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}
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static inline void change_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long temp, flags;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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bitops_lock(flags);
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temp = *m;
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*m = temp ^ (1UL << nr);
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bitops_unlock(flags);
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}
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static inline int test_and_set_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long old, flags;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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bitops_lock(flags);
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old = *m;
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*m = old | (1 << nr);
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bitops_unlock(flags);
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return (old & (1 << nr)) != 0;
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}
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static inline int
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test_and_clear_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long old, flags;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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bitops_lock(flags);
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old = *m;
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*m = old & ~(1 << nr);
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bitops_unlock(flags);
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return (old & (1 << nr)) != 0;
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}
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static inline int
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test_and_change_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long old, flags;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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bitops_lock(flags);
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old = *m;
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*m = old ^ (1 << nr);
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bitops_unlock(flags);
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return (old & (1 << nr)) != 0;
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}
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#endif /* CONFIG_ARC_HAS_LLSC */
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/***************************************
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* Non atomic variants
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**************************************/
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static inline void __set_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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temp = *m;
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*m = temp | (1UL << nr);
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}
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static inline void __clear_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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temp = *m;
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*m = temp & ~(1UL << nr);
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}
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static inline void __change_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long temp;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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temp = *m;
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*m = temp ^ (1UL << nr);
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}
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static inline int
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__test_and_set_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long old;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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old = *m;
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*m = old | (1 << nr);
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return (old & (1 << nr)) != 0;
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}
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static inline int
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__test_and_clear_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long old;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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old = *m;
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*m = old & ~(1 << nr);
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return (old & (1 << nr)) != 0;
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}
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static inline int
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__test_and_change_bit(unsigned long nr, volatile unsigned long *m)
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{
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unsigned long old;
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m += nr >> 5;
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if (__builtin_constant_p(nr))
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nr &= 0x1f;
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old = *m;
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*m = old ^ (1 << nr);
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return (old & (1 << nr)) != 0;
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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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static inline int
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__constant_test_bit(unsigned int nr, const volatile unsigned long *addr)
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{
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return ((1UL << (nr & 31)) &
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(((const volatile unsigned int *)addr)[nr >> 5])) != 0;
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}
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static inline int
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__test_bit(unsigned int nr, const volatile unsigned long *addr)
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{
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unsigned long mask;
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addr += nr >> 5;
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/* ARC700 only considers 5 bits in bit-fiddling insn */
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mask = 1 << nr;
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return ((mask & *addr) != 0);
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}
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#define test_bit(nr, addr) (__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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* Count the number of zeros, starting from MSB
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* Helper for fls( ) friends
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* This is a pure count, so (1-32) or (0-31) doesn't apply
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* It could be 0 to 32, based on num of 0's in there
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* clz(0x8000_0000) = 0, clz(0xFFFF_FFFF)=0, clz(0) = 32, clz(1) = 31
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*/
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static inline __attribute__ ((const)) int clz(unsigned int x)
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{
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unsigned int res;
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__asm__ __volatile__(
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" norm.f %0, %1 \n"
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" mov.n %0, 0 \n"
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" add.p %0, %0, 1 \n"
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: "=r"(res)
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: "r"(x)
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: "cc");
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return res;
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}
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static inline int constant_fls(int x)
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{
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int r = 32;
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if (!x)
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return 0;
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if (!(x & 0xffff0000u)) {
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x <<= 16;
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r -= 16;
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}
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if (!(x & 0xff000000u)) {
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x <<= 8;
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r -= 8;
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}
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if (!(x & 0xf0000000u)) {
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x <<= 4;
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r -= 4;
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}
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if (!(x & 0xc0000000u)) {
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x <<= 2;
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r -= 2;
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}
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if (!(x & 0x80000000u)) {
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x <<= 1;
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r -= 1;
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}
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return r;
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}
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/*
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* fls = Find Last Set in word
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* @result: [1-32]
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* fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0
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*/
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static inline __attribute__ ((const)) int fls(unsigned long x)
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{
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if (__builtin_constant_p(x))
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return constant_fls(x);
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return 32 - clz(x);
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}
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/*
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* __fls: Similar to fls, but zero based (0-31)
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*/
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static inline __attribute__ ((const)) int __fls(unsigned long x)
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{
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if (!x)
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return 0;
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else
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return fls(x) - 1;
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}
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/*
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* ffs = Find First Set in word (LSB to MSB)
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* @result: [1-32], 0 if all 0's
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*/
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#define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); })
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/*
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* __ffs: Similar to ffs, but zero based (0-31)
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*/
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static inline __attribute__ ((const)) int __ffs(unsigned long word)
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{
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if (!word)
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return word;
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return ffs(word) - 1;
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}
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/*
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* ffz = Find First Zero in word.
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* @return:[0-31], 32 if all 1's
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*/
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#define ffz(x) __ffs(~(x))
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#include <asm-generic/bitops/hweight.h>
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#include <asm-generic/bitops/fls64.h>
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#include <asm-generic/bitops/sched.h>
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#include <asm-generic/bitops/lock.h>
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#include <asm-generic/bitops/find.h>
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#include <asm-generic/bitops/le.h>
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#include <asm-generic/bitops/ext2-atomic-setbit.h>
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#endif /* !__ASSEMBLY__ */
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#endif
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