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Kernel: Add mechanism to identity map the lowest 2MB

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Tom 2020-06-01 22:55:09 -06:00 • committed by Andreas Kling
parent 19190267a6
commit 841364b609
7 changed files with 40 additions and 12 deletions
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15
Kernel/VM/Region.cpp
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@ -40,13 +40,14 @@
namespace Kernel {
Region::Region(const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const String& name, u8 access, bool cacheable)
Region::Region(const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const String& name, u8 access, bool cacheable, bool kernel)
: m_range(range)
, m_offset_in_vmobject(offset_in_vmobject)
, m_vmobject(move(vmobject))
, m_name(name)
, m_access(access)
, m_cacheable(cacheable)
, m_kernel(kernel)
{
MM.register_region(*this);
}
@ -186,14 +187,14 @@ size_t Region::amount_shared() const
NonnullOwnPtr<Region> Region::create_user_accessible(const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const StringView& name, u8 access, bool cacheable)
{
auto region = make<Region>(range, move(vmobject), offset_in_vmobject, name, access, cacheable);
auto region = make<Region>(range, move(vmobject), offset_in_vmobject, name, access, cacheable, false);
region->m_user_accessible = true;
return region;
}
NonnullOwnPtr<Region> Region::create_kernel_only(const Range& range, NonnullRefPtr<VMObject> vmobject, size_t offset_in_vmobject, const StringView& name, u8 access, bool cacheable)
{
auto region = make<Region>(range, move(vmobject), offset_in_vmobject, name, access, cacheable);
auto region = make<Region>(range, move(vmobject), offset_in_vmobject, name, access, cacheable, true);
region->m_user_accessible = false;
return region;
}
@ -268,8 +269,12 @@ void Region::unmap(ShouldDeallocateVirtualMemoryRange deallocate_range)
dbg() << "MM: >> Unmapped " << vaddr << " => P" << String::format("%p", page ? page->paddr().get() : 0) << " <<";
#endif
}
if (deallocate_range == ShouldDeallocateVirtualMemoryRange::Yes)
m_page_directory->range_allocator().deallocate(range());
if (deallocate_range == ShouldDeallocateVirtualMemoryRange::Yes) {
if (m_page_directory->range_allocator().contains(range()))
m_page_directory->range_allocator().deallocate(range());
else
m_page_directory->identity_range_allocator().deallocate(range());
}
m_page_directory = nullptr;
}