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Fix end_va bug in translated_byte_buffer

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This commit is contained in:
Yifan Wu 2021-03-23 19:18:12 +08:00
parent 171accfadd
commit 8ca3b5826d
1 changed files with 6 additions and 2 deletions
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8
os/src/mm/page_table.rs
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@ -131,7 +131,7 @@ impl PageTable {
}
}
pub fn translated_byte_buffer(token: usize, ptr: *const u8, len: usize) -> Vec<&'static [u8]> {
pub fn translated_byte_buffer(token: usize, ptr: *const u8, len: usize) -> Vec<&'static mut [u8]> {
let page_table = PageTable::from_token(token);
let mut start = ptr as usize;
let end = start + len;
@ -146,7 +146,11 @@ pub fn translated_byte_buffer(token: usize, ptr: *const u8, len: usize) -> Vec<&
vpn.step();
let mut end_va: VirtAddr = vpn.into();
end_va = end_va.min(VirtAddr::from(end));
v.push(&ppn.get_bytes_array()[start_va.page_offset()..end_va.page_offset()]);
if end_va.page_offset() == 0 {
v.push(&mut ppn.get_bytes_array()[start_va.page_offset()..]);
} else {
v.push(&mut ppn.get_bytes_array()[start_va.page_offset()..end_va.page_offset()]);
}
start = end_va.into();
}
v