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make clear_bss faster

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This commit is contained in:
WangRunji 2018-12-23 03:10:59 +08:00
parent 1d1d4109c3
commit 70b6db4282
1 changed files with 5 additions and 4 deletions
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9
kernel/src/arch/riscv32/memory.rs
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@ -86,10 +86,11 @@ fn remap_the_kernel() {
static mut SATP: usize = 0;
pub unsafe fn clear_bss() {
let bss_start = sbss as usize;
let bss_end = ebss as usize;
for i in bss_start..bss_end {
(i as *mut u8).write(0);
let start = sbss as usize;
let end = ebss as usize;
let step = core::mem::size_of::<usize>();
for i in (start..end).step_by(step) {
(i as *mut usize).write(0);
}
}