438 lines
9.8 KiB
C
438 lines
9.8 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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#ifndef CONFIG_ARC_HAS_LLSC
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#include <asm/smp.h>
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#endif
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#ifdef CONFIG_ARC_HAS_LLSC
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/*
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* Hardware assisted Atomic-R-M-W
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*/
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#define BIT_OP(op, c_op, asm_op) \
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static inline void op##_bit(unsigned long nr, volatile unsigned long *m)\
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{ \
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unsigned int temp; \
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\
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m += nr >> 5; \
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\
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nr &= 0x1f; \
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\
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__asm__ __volatile__( \
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"1: llock %0, [%1] \n" \
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" " #asm_op " %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) /* Early clobber, to prevent reg reuse */ \
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: "r"(m), /* Not "m": llock only supports reg direct addr mode */ \
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"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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#define TEST_N_BIT_OP(op, c_op, asm_op) \
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static inline int test_and_##op##_bit(unsigned long nr, volatile unsigned long *m)\
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{ \
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unsigned long old, temp; \
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\
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m += nr >> 5; \
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\
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nr &= 0x1f; \
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\
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/* \
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* Explicit full memory barrier needed before/after as \
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* LLOCK/SCOND themselves don't provide any such smenatic \
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*/ \
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smp_mb(); \
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\
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__asm__ __volatile__( \
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"1: llock %0, [%2] \n" \
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" " #asm_op " %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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\
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smp_mb(); \
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\
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return (old & (1 << nr)) != 0; \
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}
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#elif !defined(CONFIG_ARC_PLAT_EZNPS)
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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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#define BIT_OP(op, c_op, asm_op) \
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static inline void op##_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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\
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/* \
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* spin lock/unlock provide the needed smp_mb() before/after \
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*/ \
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bitops_lock(flags); \
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\
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temp = *m; \
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*m = temp c_op (1UL << (nr & 0x1f)); \
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\
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bitops_unlock(flags); \
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}
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#define TEST_N_BIT_OP(op, c_op, asm_op) \
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static inline int test_and_##op##_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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\
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bitops_lock(flags); \
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\
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old = *m; \
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*m = old c_op (1UL << (nr & 0x1f)); \
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\
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bitops_unlock(flags); \
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\
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return (old & (1UL << (nr & 0x1f))) != 0; \
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}
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#else /* CONFIG_ARC_PLAT_EZNPS */
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#define BIT_OP(op, c_op, asm_op) \
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static inline void op##_bit(unsigned long nr, volatile unsigned long *m)\
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{ \
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m += nr >> 5; \
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\
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nr = (1UL << (nr & 0x1f)); \
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if (asm_op == CTOP_INST_AAND_DI_R2_R2_R3) \
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nr = ~nr; \
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\
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__asm__ __volatile__( \
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" mov r2, %0\n" \
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" mov r3, %1\n" \
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" .word %2\n" \
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: \
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: "r"(nr), "r"(m), "i"(asm_op) \
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: "r2", "r3", "memory"); \
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}
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#define TEST_N_BIT_OP(op, c_op, asm_op) \
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static inline int test_and_##op##_bit(unsigned long nr, volatile unsigned long *m)\
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{ \
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unsigned long old; \
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\
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m += nr >> 5; \
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\
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nr = old = (1UL << (nr & 0x1f)); \
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if (asm_op == CTOP_INST_AAND_DI_R2_R2_R3) \
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old = ~old; \
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\
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/* Explicit full memory barrier needed before/after */ \
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smp_mb(); \
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\
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__asm__ __volatile__( \
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" mov r2, %0\n" \
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" mov r3, %1\n" \
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" .word %2\n" \
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" mov %0, r2" \
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: "+r"(old) \
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: "r"(m), "i"(asm_op) \
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: "r2", "r3", "memory"); \
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\
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smp_mb(); \
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\
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return (old & nr) != 0; \
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}
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#endif /* CONFIG_ARC_PLAT_EZNPS */
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/***************************************
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* Non atomic variants
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**************************************/
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#define __BIT_OP(op, c_op, asm_op) \
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static inline void __##op##_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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\
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temp = *m; \
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*m = temp c_op (1UL << (nr & 0x1f)); \
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}
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#define __TEST_N_BIT_OP(op, c_op, asm_op) \
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static inline int __test_and_##op##_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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\
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old = *m; \
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*m = old c_op (1UL << (nr & 0x1f)); \
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\
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return (old & (1UL << (nr & 0x1f))) != 0; \
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}
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#define BIT_OPS(op, c_op, asm_op) \
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\
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/* set_bit(), clear_bit(), change_bit() */ \
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BIT_OP(op, c_op, asm_op) \
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\
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/* test_and_set_bit(), test_and_clear_bit(), test_and_change_bit() */\
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TEST_N_BIT_OP(op, c_op, asm_op) \
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\
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/* __set_bit(), __clear_bit(), __change_bit() */ \
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__BIT_OP(op, c_op, asm_op) \
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\
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/* __test_and_set_bit(), __test_and_clear_bit(), __test_and_change_bit() */\
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__TEST_N_BIT_OP(op, c_op, asm_op)
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#ifndef CONFIG_ARC_PLAT_EZNPS
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BIT_OPS(set, |, bset)
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BIT_OPS(clear, & ~, bclr)
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BIT_OPS(change, ^, bxor)
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#else
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BIT_OPS(set, |, CTOP_INST_AOR_DI_R2_R2_R3)
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BIT_OPS(clear, & ~, CTOP_INST_AAND_DI_R2_R2_R3)
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BIT_OPS(change, ^, CTOP_INST_AXOR_DI_R2_R2_R3)
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#endif
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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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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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mask = 1UL << (nr & 0x1f);
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return ((mask & *addr) != 0);
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}
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#ifdef CONFIG_ISA_ARCOMPACT
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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)) unsigned long __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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#else /* CONFIG_ISA_ARCV2 */
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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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int n;
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asm volatile(
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" fls.f %0, %1 \n" /* 0:31; 0(Z) if src 0 */
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" add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */
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: "=r"(n) /* Early clobber not needed */
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: "r"(x)
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: "cc");
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return n;
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}
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/*
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* __fls: Similar to fls, but zero based (0-31). Also 0 if no bit set
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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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/* FLS insn has exactly same semantics as the API */
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return __builtin_arc_fls(x);
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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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static inline __attribute__ ((const)) int ffs(unsigned long x)
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{
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int n;
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asm volatile(
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" ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */
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" add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */
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" mov.z %0, 0 \n" /* 31(Z)-> 0 */
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: "=r"(n) /* Early clobber not needed */
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: "r"(x)
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: "cc");
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return n;
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}
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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)) unsigned long __ffs(unsigned long x)
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{
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unsigned long n;
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asm volatile(
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" ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */
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" mov.z %0, 0 \n" /* 31(Z)-> 0 */
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: "=r"(n)
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: "r"(x)
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: "cc");
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return n;
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}
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#endif /* CONFIG_ISA_ARCOMPACT */
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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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