1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
// SPDX-License-Identifier: Apache-2.0 OR MIT
// Run-time feature detection on aarch64 Fuchsia by using zx_system_get_features.
//
// As of nightly-2023-01-23, is_aarch64_feature_detected doesn't support run-time detection on Fuchsia.
// https://github.com/rust-lang/stdarch/blob/a0c30f3e3c75adcd6ee7efc94014ebcead61c507/crates/std_detect/src/detect/mod.rs
//
// Refs:
// - https://fuchsia.dev/fuchsia-src/reference/syscalls/system_get_features
// - https://github.com/llvm/llvm-project/commit/4e731abc55681751b5d736b613f7720e50eb1ad4
include!("common.rs");
#[allow(non_camel_case_types)]
mod ffi {
// https://fuchsia.googlesource.com/fuchsia/+/refs/heads/main/zircon/system/public/zircon/types.h
pub(crate) type zx_status_t = i32;
// https://fuchsia.googlesource.com/fuchsia/+/refs/heads/main/zircon/system/public/zircon/errors.h
pub(crate) const ZX_OK: zx_status_t = 0;
// https://fuchsia.googlesource.com/fuchsia/+/refs/heads/main/zircon/system/public/zircon/features.h
pub(crate) const ZX_FEATURE_KIND_CPU: u32 = 0;
pub(crate) const ZX_ARM64_FEATURE_ISA_ATOMICS: u32 = 1 << 8;
#[link(name = "zircon")]
extern "C" {
// https://fuchsia.dev/fuchsia-src/reference/syscalls/system_get_features
pub(crate) fn zx_system_get_features(kind: u32, features: *mut u32) -> zx_status_t;
}
}
fn zx_system_get_features(kind: u32) -> u32 {
let mut out = 0_u32;
// SAFETY: the pointer is valid because we got it from a reference.
let res = unsafe { ffi::zx_system_get_features(kind, &mut out) };
if res != ffi::ZX_OK {
return 0;
}
out
}
#[cold]
fn _detect(info: &mut CpuInfo) {
let features = zx_system_get_features(ffi::ZX_FEATURE_KIND_CPU);
if features & ffi::ZX_ARM64_FEATURE_ISA_ATOMICS != 0 {
info.set(CpuInfo::HAS_LSE);
}
}
#[allow(
clippy::alloc_instead_of_core,
clippy::std_instead_of_alloc,
clippy::std_instead_of_core,
clippy::undocumented_unsafe_blocks,
clippy::wildcard_imports
)]
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_fuchsia() {
let features = zx_system_get_features(ffi::ZX_FEATURE_KIND_CPU);
assert_ne!(features, 0);
std::eprintln!("features: {:b}", features);
}
// Static assertions for FFI bindings.
// This checks that FFI bindings defined in this crate and FFI bindings
// generated for the platform's latest header file using bindgen have
// compatible signatures (or the same values if constants).
// Since this is static assertion, we can detect problems with
// `cargo check --tests --target <target>` run in CI (via TESTS=1 build.sh)
// without actually running tests on these platforms.
// See also tools/codegen/src/ffi.rs.
// TODO(codegen): auto-generate this test
#[allow(
clippy::cast_possible_wrap,
clippy::cast_sign_loss,
clippy::cast_possible_truncation,
clippy::no_effect_underscore_binding
)]
const _: fn() = || {
use test_helper::sys;
// TODO(codegen): zx_system_get_features
let _: ffi::zx_status_t = 0 as sys::zx_status_t;
static_assert!(ffi::ZX_OK == sys::ZX_OK as ffi::zx_status_t);
static_assert!(ffi::ZX_FEATURE_KIND_CPU == sys::ZX_FEATURE_KIND_CPU);
static_assert!(ffi::ZX_ARM64_FEATURE_ISA_ATOMICS == sys::ZX_ARM64_FEATURE_ISA_ATOMICS);
};
}
|
