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123 lines
2.4 KiB
123 lines
2.4 KiB
/* |
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* Generic barrier definitions, originally based on MN10300 definitions. |
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* |
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* It should be possible to use these on really simple architectures, |
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* but it serves more as a starting point for new ports. |
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* |
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells (dhowells@redhat.com) |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public Licence |
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* as published by the Free Software Foundation; either version |
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* 2 of the Licence, or (at your option) any later version. |
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*/ |
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#ifndef __ASM_GENERIC_BARRIER_H |
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#define __ASM_GENERIC_BARRIER_H |
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#ifndef __ASSEMBLY__ |
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#include <linux/compiler.h> |
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#ifndef nop |
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#define nop() asm volatile ("nop") |
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#endif |
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/* |
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* Force strict CPU ordering. And yes, this is required on UP too when we're |
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* talking to devices. |
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* |
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* Fall back to compiler barriers if nothing better is provided. |
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*/ |
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#ifndef mb |
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#define mb() barrier() |
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#endif |
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#ifndef rmb |
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#define rmb() mb() |
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#endif |
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#ifndef wmb |
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#define wmb() mb() |
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#endif |
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#ifndef dma_rmb |
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#define dma_rmb() rmb() |
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#endif |
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#ifndef dma_wmb |
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#define dma_wmb() wmb() |
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#endif |
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#ifndef read_barrier_depends |
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#define read_barrier_depends() do { } while (0) |
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#endif |
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#ifdef CONFIG_SMP |
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#ifndef smp_mb |
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#define smp_mb() mb() |
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#endif |
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#ifndef smp_rmb |
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#define smp_rmb() rmb() |
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#endif |
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#ifndef smp_wmb |
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#define smp_wmb() wmb() |
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#endif |
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#ifndef smp_read_barrier_depends |
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#define smp_read_barrier_depends() read_barrier_depends() |
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#endif |
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#else /* !CONFIG_SMP */ |
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#ifndef smp_mb |
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#define smp_mb() barrier() |
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#endif |
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#ifndef smp_rmb |
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#define smp_rmb() barrier() |
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#endif |
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#ifndef smp_wmb |
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#define smp_wmb() barrier() |
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#endif |
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#ifndef smp_read_barrier_depends |
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#define smp_read_barrier_depends() do { } while (0) |
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#endif |
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#endif /* CONFIG_SMP */ |
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#ifndef smp_store_mb |
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#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); mb(); } while (0) |
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#endif |
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#ifndef smp_mb__before_atomic |
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#define smp_mb__before_atomic() smp_mb() |
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#endif |
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#ifndef smp_mb__after_atomic |
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#define smp_mb__after_atomic() smp_mb() |
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#endif |
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#define smp_store_release(p, v) \ |
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do { \ |
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compiletime_assert_atomic_type(*p); \ |
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smp_mb(); \ |
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WRITE_ONCE(*p, v); \ |
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} while (0) |
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#define smp_load_acquire(p) \ |
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({ \ |
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typeof(*p) ___p1 = READ_ONCE(*p); \ |
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compiletime_assert_atomic_type(*p); \ |
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smp_mb(); \ |
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___p1; \ |
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}) |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* __ASM_GENERIC_BARRIER_H */
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