Release 4.16 arch/s390/include/asm/barrier.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright IBM Corp. 1999, 2009
 *
 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 */

#ifndef __ASM_BARRIER_H

#define __ASM_BARRIER_H

/*
 * Force strict CPU ordering.
 * And yes, this is required on UP too when we're talking
 * to devices.
 */

#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
/* Fast-BCR without checkpoint synchronization */

#define __ASM_BARRIER "bcr 14,0\n"
#else

#define __ASM_BARRIER "bcr 15,0\n"
#endif


#define mb() do {  asm volatile(__ASM_BARRIER : : : "memory"); } while (0)


#define rmb()				barrier()

#define wmb()				barrier()

#define dma_rmb()			mb()

#define dma_wmb()			mb()

#define __smp_mb()			mb()

#define __smp_rmb()			rmb()

#define __smp_wmb()			wmb()


#define __smp_store_release(p, v)					\
do {                                                                    \
        compiletime_assert_atomic_type(*p);                             \
        barrier();                                                      \
        WRITE_ONCE(*p, v);                                              \
} while (0)


#define __smp_load_acquire(p)						\
({                                                                      \
        typeof(*p) ___p1 = READ_ONCE(*p);                               \
        compiletime_assert_atomic_type(*p);                             \
        barrier();                                                      \
        ___p1;                                                          \
})


#define __smp_mb__before_atomic()	barrier()

#define __smp_mb__after_atomic()	barrier()

/**
 * array_index_mask_nospec - generate a mask for array_idx() that is
 * ~0UL when the bounds check succeeds and 0 otherwise
 * @index: array element index
 * @size: number of elements in array
 */

#define array_index_mask_nospec array_index_mask_nospec


static inline unsigned long array_index_mask_nospec(unsigned long index,
						    unsigned long size)
{
	unsigned long mask;

	if (__builtin_constant_p(size) && size > 0) {
		asm("   clgr    %2,%1\n"
                    "   slbgr   %0,%0\n"
                    :"=d" (mask) : "d" (size-1), "d" (index) :"cc");
		return mask;
	}
	asm("   clgr    %1,%2\n"
            "   slbgr   %0,%0\n"
            :"=d" (mask) : "d" (size), "d" (index) :"cc");
	return ~mask;
}

Contributors
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Martin Schwidefsky
42
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1
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Total
42
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1
100.00%

#include <asm-generic/barrier.h>

#endif /* __ASM_BARRIER_H */
Overall Contributors
Person
Tokens
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Commits
CommitProp
Martin Schwidefsky
47
32.19%
1
7.14%
Michael S. Tsirkin
30
20.55%
3
21.43%
Heiko Carstens
22
15.07%
4
28.57%
David Howells
18
12.33%
1
7.14%
Peter Zijlstra
14
9.59%
1
7.14%
Alexander Duyck
8
5.48%
1
7.14%
Christian Bornträger
4
2.74%
1
7.14%
Andrey Konovalov
2
1.37%
1
7.14%
Greg Kroah-Hartman
1
0.68%
1
7.14%
Total
146
100.00%
14
100.00%
Directory: arch/s390/include/asm

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