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Kernel: Add Region::clear_to_zero

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This helper method can be used to quickly and efficiently zero out a
region.
This commit is contained in:
Idan Horowitz 2021-11-29 21:18:59 +02:00
parent 5f95a1a7b7
commit ff6b43734c
2 changed files with 15 additions and 0 deletions
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13
Kernel/Memory/Region.cpp
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@ -293,6 +293,19 @@ void Region::remap()
TODO();
}
void Region::clear_to_zero()
{
VERIFY(vmobject().is_anonymous());
SpinlockLocker locker(vmobject().m_lock);
for (auto i = 0u; i < page_count(); ++i) {
auto page = physical_page_slot(i);
VERIFY(page);
if (page->is_shared_zero_page())
continue;
page = MM.shared_zero_page();
}
}
PageFaultResponse Region::handle_fault(PageFault const& fault)
{
auto page_index_in_region = page_index_from_address(fault.vaddr());