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78 lines
1.8 KiB
78 lines
1.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright IBM Corp. 1999, 2009 |
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* |
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* Author(s): Martin Schwidefsky <[email protected]> |
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*/ |
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#ifndef __ASM_BARRIER_H |
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#define __ASM_BARRIER_H |
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/* |
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* Force strict CPU ordering. |
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* And yes, this is required on UP too when we're talking |
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* to devices. |
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*/ |
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#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES |
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/* Fast-BCR without checkpoint synchronization */ |
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#define __ASM_BARRIER "bcr 14,0\n" |
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#else |
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#define __ASM_BARRIER "bcr 15,0\n" |
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#endif |
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#define mb() do { asm volatile(__ASM_BARRIER : : : "memory"); } while (0) |
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#define rmb() barrier() |
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#define wmb() barrier() |
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#define dma_rmb() mb() |
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#define dma_wmb() mb() |
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#define __smp_mb() mb() |
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#define __smp_rmb() rmb() |
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#define __smp_wmb() wmb() |
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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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barrier(); \ |
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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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barrier(); \ |
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___p1; \ |
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}) |
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#define __smp_mb__before_atomic() barrier() |
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#define __smp_mb__after_atomic() barrier() |
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/** |
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* array_index_mask_nospec - generate a mask for array_idx() that is |
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* ~0UL when the bounds check succeeds and 0 otherwise |
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* @index: array element index |
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* @size: number of elements in array |
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*/ |
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#define array_index_mask_nospec array_index_mask_nospec |
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static inline unsigned long array_index_mask_nospec(unsigned long index, |
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unsigned long size) |
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{ |
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unsigned long mask; |
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if (__builtin_constant_p(size) && size > 0) { |
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asm(" clgr %2,%1\n" |
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" slbgr %0,%0\n" |
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:"=d" (mask) : "d" (size-1), "d" (index) :"cc"); |
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return mask; |
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} |
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asm(" clgr %1,%2\n" |
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" slbgr %0,%0\n" |
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:"=d" (mask) : "d" (size), "d" (index) :"cc"); |
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return ~mask; |
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} |
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#include <asm-generic/barrier.h> |
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#endif /* __ASM_BARRIER_H */
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