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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef __ASM_BARRIER_H
#define __ASM_BARRIER_H
#define __sync() __asm__ __volatile__("dbar 0" : : : "memory")
#define fast_wmb() __sync()
#define fast_rmb() __sync()
#define fast_mb() __sync()
#define fast_iob() __sync()
#define wbflush() __sync()
#define wmb() fast_wmb()
#define rmb() fast_rmb()
#define mb() fast_mb()
#define iob() fast_iob()
#define __smp_mb() __asm__ __volatile__("dbar 0" : : : "memory")
#define __smp_rmb() __asm__ __volatile__("dbar 0" : : : "memory")
#define __smp_wmb() __asm__ __volatile__("dbar 0" : : : "memory")
#ifdef CONFIG_SMP
#define __WEAK_LLSC_MB " dbar 0 \n"
#else
#define __WEAK_LLSC_MB " \n"
#endif
#define __smp_mb__before_atomic() barrier()
#define __smp_mb__after_atomic() barrier()
/**
* array_index_mask_nospec() - generate a ~0 mask when index < size, 0 otherwise
* @index: array element index
* @size: number of elements in array
*
* Returns:
* 0 - (@index < @size)
*/
#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;
__asm__ __volatile__(
"sltu %0, %1, %2\n\t"
#if (__SIZEOF_LONG__ == 4)
"sub.w %0, $zero, %0\n\t"
#elif (__SIZEOF_LONG__ == 8)
"sub.d %0, $zero, %0\n\t"
#endif
: "=r" (mask)
: "r" (index), "r" (size)
:);
return mask;
}
#define __smp_load_acquire(p) \
({ \
union { typeof(*p) __val; char __c[1]; } __u; \
unsigned long __tmp = 0; \
compiletime_assert_atomic_type(*p); \
switch (sizeof(*p)) { \
case 1: \
*(__u8 *)__u.__c = *(volatile __u8 *)p; \
__smp_mb(); \
break; \
case 2: \
*(__u16 *)__u.__c = *(volatile __u16 *)p; \
__smp_mb(); \
break; \
case 4: \
__asm__ __volatile__( \
"amor_db.w %[val], %[tmp], %[mem] \n" \
: [val] "=&r" (*(__u32 *)__u.__c) \
: [mem] "ZB" (*(u32 *) p), [tmp] "r" (__tmp) \
: "memory"); \
break; \
case 8: \
__asm__ __volatile__( \
"amor_db.d %[val], %[tmp], %[mem] \n" \
: [val] "=&r" (*(__u64 *)__u.__c) \
: [mem] "ZB" (*(u64 *) p), [tmp] "r" (__tmp) \
: "memory"); \
break; \
} \
(typeof(*p))__u.__val; \
})
#define __smp_store_release(p, v) \
do { \
union { typeof(*p) __val; char __c[1]; } __u = \
{ .__val = (__force typeof(*p)) (v) }; \
unsigned long __tmp; \
compiletime_assert_atomic_type(*p); \
switch (sizeof(*p)) { \
case 1: \
__smp_mb(); \
*(volatile __u8 *)p = *(__u8 *)__u.__c; \
break; \
case 2: \
__smp_mb(); \
*(volatile __u16 *)p = *(__u16 *)__u.__c; \
break; \
case 4: \
__asm__ __volatile__( \
"amswap_db.w %[tmp], %[val], %[mem] \n" \
: [mem] "+ZB" (*(u32 *)p), [tmp] "=&r" (__tmp) \
: [val] "r" (*(__u32 *)__u.__c) \
: ); \
break; \
case 8: \
__asm__ __volatile__( \
"amswap_db.d %[tmp], %[val], %[mem] \n" \
: [mem] "+ZB" (*(u64 *)p), [tmp] "=&r" (__tmp) \
: [val] "r" (*(__u64 *)__u.__c) \
: ); \
break; \
} \
} while (0)
#define __smp_store_mb(p, v) \
do { \
union { typeof(p) __val; char __c[1]; } __u = \
{ .__val = (__force typeof(p)) (v) }; \
unsigned long __tmp; \
switch (sizeof(p)) { \
case 1: \
*(volatile __u8 *)&p = *(__u8 *)__u.__c; \
__smp_mb(); \
break; \
case 2: \
*(volatile __u16 *)&p = *(__u16 *)__u.__c; \
__smp_mb(); \
break; \
case 4: \
__asm__ __volatile__( \
"amswap_db.w %[tmp], %[val], %[mem] \n" \
: [mem] "+ZB" (*(u32 *)&p), [tmp] "=&r" (__tmp) \
: [val] "r" (*(__u32 *)__u.__c) \
: ); \
break; \
case 8: \
__asm__ __volatile__( \
"amswap_db.d %[tmp], %[val], %[mem] \n" \
: [mem] "+ZB" (*(u64 *)&p), [tmp] "=&r" (__tmp) \
: [val] "r" (*(__u64 *)__u.__c) \
: ); \
break; \
} \
} while (0)
#include <asm-generic/barrier.h>
#endif /* __ASM_BARRIER_H */
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