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32 lines
1.1 KiB
32 lines
1.1 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#include <stdlib.h> |
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#if defined(__i386__) || defined(__x86_64__) |
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#define barrier() asm volatile("" ::: "memory") |
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#define virt_mb() __sync_synchronize() |
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#define virt_rmb() barrier() |
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#define virt_wmb() barrier() |
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/* Atomic store should be enough, but gcc generates worse code in that case. */ |
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#define virt_store_mb(var, value) do { \ |
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typeof(var) virt_store_mb_value = (value); \ |
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__atomic_exchange(&(var), &virt_store_mb_value, &virt_store_mb_value, \ |
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__ATOMIC_SEQ_CST); \ |
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barrier(); \ |
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} while (0); |
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/* Weak barriers should be used. If not - it's a bug */ |
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# define mb() abort() |
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# define dma_rmb() abort() |
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# define dma_wmb() abort() |
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#elif defined(__aarch64__) |
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#define dmb(opt) asm volatile("dmb " #opt : : : "memory") |
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#define virt_mb() __sync_synchronize() |
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#define virt_rmb() dmb(ishld) |
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#define virt_wmb() dmb(ishst) |
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#define virt_store_mb(var, value) do { WRITE_ONCE(var, value); dmb(ish); } while (0) |
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/* Weak barriers should be used. If not - it's a bug */ |
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# define mb() abort() |
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# define dma_rmb() abort() |
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# define dma_wmb() abort() |
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#else |
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#error Please fill in barrier macros |
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#endif |
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