48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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/* Copyright (c) 2019 Facebook */
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#ifndef __LIBBPF_LIBBPF_UTIL_H
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#define __LIBBPF_LIBBPF_UTIL_H
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Use these barrier functions instead of smp_[rw]mb() when they are
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* used in a libbpf header file. That way they can be built into the
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* application that uses libbpf.
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*/
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#if defined(__i386__) || defined(__x86_64__)
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# define libbpf_smp_rmb() asm volatile("" : : : "memory")
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# define libbpf_smp_wmb() asm volatile("" : : : "memory")
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# define libbpf_smp_mb() \
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asm volatile("lock; addl $0,-4(%%rsp)" : : : "memory", "cc")
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/* Hinders stores to be observed before older loads. */
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# define libbpf_smp_rwmb() asm volatile("" : : : "memory")
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#elif defined(__aarch64__)
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# define libbpf_smp_rmb() asm volatile("dmb ishld" : : : "memory")
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# define libbpf_smp_wmb() asm volatile("dmb ishst" : : : "memory")
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# define libbpf_smp_mb() asm volatile("dmb ish" : : : "memory")
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# define libbpf_smp_rwmb() libbpf_smp_mb()
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#elif defined(__arm__)
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/* These are only valid for armv7 and above */
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# define libbpf_smp_rmb() asm volatile("dmb ish" : : : "memory")
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# define libbpf_smp_wmb() asm volatile("dmb ishst" : : : "memory")
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# define libbpf_smp_mb() asm volatile("dmb ish" : : : "memory")
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# define libbpf_smp_rwmb() libbpf_smp_mb()
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#else
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/* Architecture missing native barrier functions. */
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# define libbpf_smp_rmb() __sync_synchronize()
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# define libbpf_smp_wmb() __sync_synchronize()
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# define libbpf_smp_mb() __sync_synchronize()
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# define libbpf_smp_rwmb() __sync_synchronize()
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#endif
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif
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