sel4_initialize_tls/
static_allocation.rs

1//
2// Copyright 2023, Colias Group, LLC
3//
4// SPDX-License-Identifier: BSD-2-Clause
5//
6
7use core::cell::UnsafeCell;
8
9use crate::Region;
10
11#[repr(C)]
12pub struct StaticTlsAllocation<const N: usize, A = ()> {
13    _alignment: [A; 0],
14    space: UnsafeCell<[u8; N]>,
15}
16
17unsafe impl<const N: usize, A> Sync for StaticTlsAllocation<N, A> {}
18
19impl<const N: usize, A> StaticTlsAllocation<N, A> {
20    pub const fn new() -> Self {
21        Self {
22            _alignment: [],
23            space: UnsafeCell::new([0; N]),
24        }
25    }
26
27    const fn size(&self) -> usize {
28        N
29    }
30
31    const fn start(&self) -> *mut u8 {
32        self.space.get().cast()
33    }
34
35    pub const fn region(&self) -> Region {
36        Region::new(self.start(), self.size())
37    }
38}
39
40impl<const N: usize, A> Default for StaticTlsAllocation<N, A> {
41    fn default() -> Self {
42        Self::new()
43    }
44}