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53 lines
1.3 KiB
Rust
53 lines
1.3 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2020 Andre Richter <andre.o.richter@gmail.com>
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//! Memory Management.
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pub mod mmu;
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use core::ops::Range;
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// Zero out a memory region.
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///
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/// # Safety
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///
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/// - `range.start` and `range.end` must be valid.
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/// - `range.start` and `range.end` must be `T` aligned.
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pub unsafe fn zero_volatile<T>(range: Range<*mut T>)
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where
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T: From<u8>,
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{
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let mut ptr = range.start;
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while ptr < range.end {
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core::ptr::write_volatile(ptr, T::from(0));
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ptr = ptr.offset(1);
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}
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}
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//--------------------------------------------------------------------------------------------------
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// Testing
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//--------------------------------------------------------------------------------------------------
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#[cfg(test)]
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mod tests {
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use super::*;
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use test_macros::kernel_test;
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/// Check `zero_volatile()`.
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#[kernel_test]
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fn zero_volatile_works() {
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let mut x: [usize; 3] = [10, 11, 12];
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let x_range = x.as_mut_ptr_range();
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unsafe { zero_volatile(x_range) };
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assert_eq!(x, [0, 0, 0]);
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}
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}
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