| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _TOOLS_LINUX_ASM_AARCH64_BARRIER_H |
| #define _TOOLS_LINUX_ASM_AARCH64_BARRIER_H |
| |
| /* |
| * From tools/perf/perf-sys.h, last modified in: |
| * f428ebd184c82a7914b2aa7e9f868918aaf7ea78 perf tools: Fix AAAAARGH64 memory barriers |
| * |
| * XXX: arch/arm64/include/asm/barrier.h in the kernel sources use dsb, is this |
| * a case like for arm32 where we do things differently in userspace? |
| */ |
| |
| #define mb() asm volatile("dmb ish" ::: "memory") |
| #define wmb() asm volatile("dmb ishst" ::: "memory") |
| #define rmb() asm volatile("dmb ishld" ::: "memory") |
| |
| #define smp_store_release(p, v) \ |
| do { \ |
| union { typeof(*p) __val; char __c[1]; } __u = \ |
| { .__val = (v) }; \ |
| \ |
| switch (sizeof(*p)) { \ |
| case 1: \ |
| asm volatile ("stlrb %w1, %0" \ |
| : "=Q" (*p) \ |
| : "r" (*(__u8_alias_t *)__u.__c) \ |
| : "memory"); \ |
| break; \ |
| case 2: \ |
| asm volatile ("stlrh %w1, %0" \ |
| : "=Q" (*p) \ |
| : "r" (*(__u16_alias_t *)__u.__c) \ |
| : "memory"); \ |
| break; \ |
| case 4: \ |
| asm volatile ("stlr %w1, %0" \ |
| : "=Q" (*p) \ |
| : "r" (*(__u32_alias_t *)__u.__c) \ |
| : "memory"); \ |
| break; \ |
| case 8: \ |
| asm volatile ("stlr %1, %0" \ |
| : "=Q" (*p) \ |
| : "r" (*(__u64_alias_t *)__u.__c) \ |
| : "memory"); \ |
| break; \ |
| default: \ |
| /* Only to shut up gcc ... */ \ |
| mb(); \ |
| break; \ |
| } \ |
| } while (0) |
| |
| #define smp_load_acquire(p) \ |
| ({ \ |
| union { typeof(*p) __val; char __c[1]; } __u = \ |
| { .__c = { 0 } }; \ |
| \ |
| switch (sizeof(*p)) { \ |
| case 1: \ |
| asm volatile ("ldarb %w0, %1" \ |
| : "=r" (*(__u8_alias_t *)__u.__c) \ |
| : "Q" (*p) : "memory"); \ |
| break; \ |
| case 2: \ |
| asm volatile ("ldarh %w0, %1" \ |
| : "=r" (*(__u16_alias_t *)__u.__c) \ |
| : "Q" (*p) : "memory"); \ |
| break; \ |
| case 4: \ |
| asm volatile ("ldar %w0, %1" \ |
| : "=r" (*(__u32_alias_t *)__u.__c) \ |
| : "Q" (*p) : "memory"); \ |
| break; \ |
| case 8: \ |
| asm volatile ("ldar %0, %1" \ |
| : "=r" (*(__u64_alias_t *)__u.__c) \ |
| : "Q" (*p) : "memory"); \ |
| break; \ |
| default: \ |
| /* Only to shut up gcc ... */ \ |
| mb(); \ |
| break; \ |
| } \ |
| __u.__val; \ |
| }) |
| |
| #endif /* _TOOLS_LINUX_ASM_AARCH64_BARRIER_H */ |