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arch: modify or add safety comments

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Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu
2022-11-16 22:01:31 +00:00
committed by Liu Wei
parent 3edf12accf
commit f16b57716d
5 changed files with 28 additions and 8 deletions
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arch/src/x86_64/mptable.rs
+7 -1
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@@ -37,11 +37,17 @@ struct MpfIntelWrapper(mpspec::mpf_intel);
// SAFETY: These `mpspec` wrapper types are only data, reading them from data is a safe initialization.
unsafe impl ByteValued for MpcBusWrapper {}
// SAFETY: see above
unsafe impl ByteValued for MpcCpuWrapper {}
// SAFETY: see above
unsafe impl ByteValued for MpcIntsrcWrapper {}
// SAFETY: see above
unsafe impl ByteValued for MpcIoapicWrapper {}
// SAFETY: see above
unsafe impl ByteValued for MpcTableWrapper {}
// SAFETY: see above
unsafe impl ByteValued for MpcLintsrcWrapper {}
// SAFETY: see above
unsafe impl ByteValued for MpfIntelWrapper {}
#[derive(Debug)]
@@ -95,7 +101,7 @@ const CPU_FEATURE_APIC: u32 = 0x200;
const CPU_FEATURE_FPU: u32 = 0x001;
fn compute_checksum<T: Copy>(v: &T) -> u8 {
// Safe because we are only reading the bytes within the size of the `T` reference `v`.
// SAFETY: we are only reading the bytes within the size of the `T` reference `v`.
let v_slice = unsafe { slice::from_raw_parts(v as *const T as *const u8, mem::size_of::<T>()) };
let mut checksum: u8 = 0;
for i in v_slice.iter() {