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Replace VmFrame::zero with VmWriter::fill

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This commit is contained in:
LI Qing
2024-01-31 15:43:32 +09:00
committed by Tate, Hongliang Tian
parent 195c6a0739
commit 12d338dd9b
4 changed files with 23 additions and 22 deletions
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33
framework/aster-frame/src/vm/frame.rs
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@ -6,6 +6,7 @@ use core::{
marker::PhantomData,
ops::{BitAnd, BitOr, Not, Range},
};
use pod::Pod;
use crate::{config::PAGE_SIZE, prelude::*, Error};
@ -57,11 +58,6 @@ impl VmFrameVec {
Ok(())
}
/// zero all internal vm frames
pub fn zero(&self) {
self.0.iter().for_each(|vm_frame| vm_frame.zero())
}
/// Truncate some frames.
///
/// If `new_len >= self.len()`, then this method has no effect.
@ -228,12 +224,6 @@ impl VmFrame {
(self.frame_index() + 1) * PAGE_SIZE
}
/// Fills the frame with zero.
pub fn zero(&self) {
// Safety: The range of memory is valid for writes of one page data.
unsafe { core::ptr::write_bytes(self.as_mut_ptr(), 0, PAGE_SIZE) }
}
fn need_dealloc(&self) -> bool {
(*self.frame_index & VmFrameFlags::NEED_DEALLOC.bits()) != 0
}
@ -418,12 +408,6 @@ impl VmSegment {
self.nframes() * PAGE_SIZE
}
/// Fills the page frames with zero.
pub fn zero(&self) {
// Safety: The range of memory is valid for writes of `self.nbytes()` data.
unsafe { core::ptr::write_bytes(self.as_mut_ptr(), 0, self.nbytes()) }
}
fn need_dealloc(&self) -> bool {
(self.inner.start_frame_index & VmFrameFlags::NEED_DEALLOC.bits()) != 0
}
@ -700,6 +684,21 @@ impl<'a> VmWriter<'a> {
}
copy_len
}
/// Fills the available space by repeating `value`.
///
/// # Panic
///
/// The size of the available space must be a multiple of the size of `value`.
/// Otherwise, the method would panic.
pub fn fill<T: Pod>(&mut self, value: T) {
assert!(self.avail() / value.as_bytes().len() > 0);
assert!(self.avail() % value.as_bytes().len() == 0);
while self.avail() > 0 {
self.write(&mut value.as_bytes().into());
}
}
}
impl<'a> From<&'a mut [u8]> for VmWriter<'a> {