79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
|
/* 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;
|
||
|
|
}
|
||
|
|
|
||
|
|
#include <asm-generic/barrier.h>
|
||
|
|
|
||
|
|
#endif /* __ASM_BARRIER_H */
|