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

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.

1 files changed, 4 insertions, 4 deletions

diff --git a/Kernel/VM/PhysicalRegion.cpp b/Kernel/VM/PhysicalRegion.cpp
index 420442bf41..c95474798b 100644
--- a/Kernel/VM/PhysicalRegion.cpp
+++ b/Kernel/VM/PhysicalRegion.cpp
@@ -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);