kernel_api/detect/
mod.rs

1#![unstable(feature = "kernel_feature_detect", issue = "none")]
2
3#[cfg(target_arch = "x86_64")]
4mod x86;
5
6#[cfg(target_arch = "x86_64")]
7#[doc(hidden)]
8pub use x86::*;
9
10mod cache;
11
12macro_rules! features_macro {
13    (
14        @TARGET: $target:ident;
15        @CFG: $cfg:meta;
16        @MACRO_NAME: $macro_name:ident;
17        @MACRO_ATTRS: $(#[$macro_attrs:meta])*
18        $(@BIND_FEATURE_NAME: $bind_feature:tt; $feature_impl:tt;)*
19        $(@FEATURE: /*#[$stability_attr:meta]*/ $feature:ident: $feature_lit:tt;)*
20    ) => {
21        #[macro_export]
22        $(#[$macro_attrs])*
23        macro_rules! $macro_name {
24            $(
25                ($feature_lit) => {
26                    $crate::detect::__detected::$feature()
27                };
28            )*
29            $(
30                ($bind_feature) => {
31                    $crate::detect::__detected::$feature_impl()
32                };
33            )*
34            ($t:tt,) => {
35                    $crate::$macro_name!($t);
36            };
37            ($t:tt) => {
38                compile_error!(
39                    concat!(
40                        concat!("unknown ", stringify!($target)),
41                        concat!(" target feature: ", $t)
42                    )
43                )
44            };
45        }
46
47        #[doc(hidden)]
48        #[allow(non_camel_case_types)]
49        #[derive(Copy, Clone, Debug)]
50        #[repr(u32)]
51        #[cfg($cfg)]
52        pub(crate) enum Feature {
53            $(
54                $feature,
55            )*
56            _last
57        }
58
59        #[cfg($cfg)]
60        impl Feature {
61            pub(crate) fn to_str(self) -> &'static str {
62                match self {
63                    $(Feature::$feature => $feature_lit,)*
64                    Feature::_last => unreachable!(),
65                }
66            }
67        }
68
69        #[doc(hidden)]
70        #[cfg($cfg)]
71        pub mod __detected {
72            $(
73                #[inline]
74                #[doc(hidden)]
75                #[stable(feature = "kernel_core_api", since = "1.0.0")]
76                pub fn $feature() -> bool {
77                    $crate::detect::cache::test($crate::detect::Feature::$feature)
78                }
79            )*
80        }
81    };
82}
83
84pub(crate) use features_macro;
85
86pub fn features() -> impl Iterator<Item = (&'static str, bool)> {
87    (0_u32..Feature::_last as u32).map(|discriminant: u32| {
88        let f: Feature = unsafe { core::mem::transmute(discriminant) };
89        let name: &'static str = f.to_str();
90        let enabled: bool = cache::test(f);
91        (name, enabled)
92    })
93}
kernel_api/detect/mod.rs

kernel_api/detect/
mod.rs
