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Kernel: Use PAE to allow accessing all physical memory beyond 4GB

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We already use PAE for the NX bit, but this changes the PhysicalAddress
structure to be able to hold 64 bit physical addresses. This allows us
to use all the available physical memory.
This commit is contained in:
Tom 2021-07-06 21:35:15 -06:00 • committed by Andreas Kling
parent 658b41a06c
commit ad5d9d648b
Notes: sideshowbarker 2024-07-18 10:05:10 +09:00
7 changed files with 87 additions and 86 deletions
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8
Kernel/VM/PhysicalRegion.cpp
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@ -76,7 +76,7 @@ Optional<unsigned> PhysicalRegion::find_one_free_page()
// Check if we can draw one from the return queue
if (m_recently_returned.size() > 0) {
u8 index = get_fast_random<u8>() % m_recently_returned.size();
Checked<FlatPtr> local_offset = m_recently_returned[index].get();
Checked<PhysicalPtr> local_offset = m_recently_returned[index].get();
local_offset -= m_lower.get();
m_recently_returned.remove(index);
VERIFY(!local_offset.has_overflow());
@ -131,7 +131,7 @@ RefPtr<PhysicalPage> PhysicalRegion::take_free_page(bool supervisor)
if (!free_index.has_value())
return nullptr;
return PhysicalPage::create(m_lower.offset(free_index.value() * PAGE_SIZE), supervisor);
return PhysicalPage::create(m_lower.offset((PhysicalPtr)free_index.value() * PAGE_SIZE), supervisor);
}
void PhysicalRegion::free_page_at(PhysicalAddress addr)
@ -142,10 +142,10 @@ void PhysicalRegion::free_page_at(PhysicalAddress addr)
VERIFY_NOT_REACHED();
}
Checked<FlatPtr> local_offset = addr.get();
Checked<PhysicalPtr> local_offset = addr.get();
local_offset -= m_lower.get();
VERIFY(!local_offset.has_overflow());
VERIFY(local_offset.value() < (FlatPtr)(m_pages * PAGE_SIZE));
VERIFY(local_offset.value() < ((PhysicalPtr)m_pages * PAGE_SIZE));
auto page = local_offset.value() / PAGE_SIZE;
m_bitmap.set(page, false);