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Kernel: Move region map/unmap operations into the Region class

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The more Region can take care of itself, the better.
This commit is contained in:
Andreas Kling 2019-11-03 20:37:03 +01:00
parent 9e03f3ce20
commit 2cfc43c982
5 changed files with 42 additions and 39 deletions
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30
Kernel/VM/Region.cpp
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@ -41,7 +41,7 @@ Region::~Region()
// find the address<->region mappings in an invalid state there.
InterruptDisabler disabler;
if (m_page_directory) {
MM.unmap_region(*this);
unmap(ShouldDeallocateVirtualMemoryRange::Yes);
ASSERT(!m_page_directory);
}
MM.unregister_region(*this);
@ -192,3 +192,31 @@ void Region::remap_page(size_t index)
#endif
}
void Region::unmap(ShouldDeallocateVirtualMemoryRange deallocate_range)
{
InterruptDisabler disabler;
ASSERT(page_directory());
for (size_t i = 0; i < page_count(); ++i) {
auto vaddr = this->vaddr().offset(i * PAGE_SIZE);
auto& pte = MM.ensure_pte(*page_directory(), vaddr);
pte.set_physical_page_base(0);
pte.set_present(false);
pte.set_writable(false);
pte.set_user_allowed(false);
page_directory()->flush(vaddr);
#ifdef MM_DEBUG
auto& physical_page = region.vmobject().physical_pages()[region.first_page_index() + i];
dbgprintf("MM: >> Unmapped V%p => P%p <<\n", vaddr, physical_page ? physical_page->paddr().get() : 0);
#endif
}
if (deallocate_range == ShouldDeallocateVirtualMemoryRange::Yes)
page_directory()->range_allocator().deallocate(range());
release_page_directory();
}
void Region::map(Process& process)
{
MM.map_region_at_address(process.page_directory(), *this, vaddr());
}