1 use super::super::c;
2 #[cfg(any(
3     all(target_os = "android", target_pointer_width = "64"),
4     target_os = "linux",
5 ))]
6 use crate::ffi::CStr;
7 
8 // `getauxval` wasn't supported in glibc until 2.16.
9 #[cfg(any(
10     all(target_os = "android", target_pointer_width = "64"),
11     target_os = "linux",
12 ))]
13 weak!(fn getauxval(c::c_ulong) -> *mut c::c_void);
14 
15 #[inline]
16 pub(crate) fn page_size() -> usize {
17     unsafe { c::sysconf(c::_SC_PAGESIZE) as usize }
18 }
19 
20 #[cfg(not(target_os = "wasi"))]
21 #[inline]
22 pub(crate) fn clock_ticks_per_second() -> u64 {
23     unsafe { c::sysconf(c::_SC_CLK_TCK) as u64 }
24 }
25 
26 #[cfg(any(
27     all(target_os = "android", target_pointer_width = "64"),
28     target_os = "linux",
29 ))]
30 #[inline]
31 pub(crate) fn linux_hwcap() -> (usize, usize) {
32     if let Some(libc_getauxval) = getauxval.get() {
33         unsafe {
34             let hwcap = libc_getauxval(c::AT_HWCAP) as usize;
35             let hwcap2 = libc_getauxval(c::AT_HWCAP2) as usize;
36             (hwcap, hwcap2)
37         }
38     } else {
39         (0, 0)
40     }
41 }
42 
43 #[cfg(any(
44     all(target_os = "android", target_pointer_width = "64"),
45     target_os = "linux",
46 ))]
47 #[inline]
48 pub(crate) fn linux_execfn() -> &'static CStr {
49     if let Some(libc_getauxval) = getauxval.get() {
50         unsafe { CStr::from_ptr(libc_getauxval(c::AT_EXECFN).cast()) }
51     } else {
52         cstr!("")
53     }
54 }
55