diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2023-05-18 08:22:51 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2023-05-23 16:51:18 -0700 |
| commit | 412db3d5b54ff4577f02aad7918c85d1b9ee7ab3 (patch) | |
| tree | 034bee2a49a3cb869ee5a69fa2c90c19e5af7395 /host/include/generic | |
| parent | 0dd0c7fa2055d5f95413b510386753bb00d61202 (diff) | |
include/host: Split out atomic128-cas.h
Separates the aarch64-specific portion into its own file.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'host/include/generic')
| -rw-r--r-- | host/include/generic/host/atomic128-cas.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/host/include/generic/host/atomic128-cas.h b/host/include/generic/host/atomic128-cas.h new file mode 100644 index 0000000000..513622fe34 --- /dev/null +++ b/host/include/generic/host/atomic128-cas.h @@ -0,0 +1,43 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + * Compare-and-swap for 128-bit atomic operations, generic version. + * + * Copyright (C) 2018, 2023 Linaro, Ltd. + * + * See docs/devel/atomics.rst for discussion about the guarantees each + * atomic primitive is meant to provide. + */ + +#ifndef HOST_ATOMIC128_CAS_H +#define HOST_ATOMIC128_CAS_H + +#if defined(CONFIG_ATOMIC128) +static inline Int128 atomic16_cmpxchg(Int128 *ptr, Int128 cmp, Int128 new) +{ + Int128Alias r, c, n; + + c.s = cmp; + n.s = new; + r.i = qatomic_cmpxchg__nocheck((__int128_t *)ptr, c.i, n.i); + return r.s; +} +# define HAVE_CMPXCHG128 1 +#elif defined(CONFIG_CMPXCHG128) +static inline Int128 atomic16_cmpxchg(Int128 *ptr, Int128 cmp, Int128 new) +{ + Int128Alias r, c, n; + + c.s = cmp; + n.s = new; + r.i = __sync_val_compare_and_swap_16((__int128_t *)ptr, c.i, n.i); + return r.s; +} +# define HAVE_CMPXCHG128 1 +#else +/* Fallback definition that must be optimized away, or error. */ +Int128 QEMU_ERROR("unsupported atomic") + atomic16_cmpxchg(Int128 *ptr, Int128 cmp, Int128 new); +# define HAVE_CMPXCHG128 0 +#endif + +#endif /* HOST_ATOMIC128_CAS_H */ |