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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(); 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) PageFaultResponse Region::handle_fault(PageFault const& fault)
{ {
auto page_index_in_region = page_index_from_address(fault.vaddr()); auto page_index_in_region = page_index_from_address(fault.vaddr());

2
Kernel/Memory/Region.h
View file

@ -182,6 +182,8 @@ public:
void remap(); void remap();
void clear_to_zero();
[[nodiscard]] bool is_syscall_region() const { return m_syscall_region; } [[nodiscard]] bool is_syscall_region() const { return m_syscall_region; }
void set_syscall_region(bool b) { m_syscall_region = b; } void set_syscall_region(bool b) { m_syscall_region = b; }