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Refactor the virtual memory object model a bit:

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Process now has a number of Regions.
Each Region is backed by a VMObject.
A VMObject can be file-backed or anonymous. These can be shared.
This commit is contained in:
Andreas Kling 2018-11-08 14:35:30 +01:00
parent 3c8064a787
commit 862f108cb5
6 changed files with 165 additions and 31 deletions
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7
Kernel/Process.cpp
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@ -100,8 +100,8 @@ Region* Process::allocate_region(LinearAddress laddr, size_t size, String&& name
unsigned page_count = ceilDiv(size, PAGE_SIZE);
auto physical_pages = MM.allocate_physical_pages(page_count);
ASSERT(physical_pages.size() == page_count);
m_regions.append(adopt(*new Region(laddr, size, move(physical_pages), move(name), is_readable, is_writable)));
m_regions.append(adopt(*new Region(laddr, size, move(name), is_readable, is_writable)));
m_regions.last()->commit(*this);
MM.mapRegion(*this, *m_regions.last());
return m_regions.last().ptr();
}
@ -122,8 +122,7 @@ Region* Process::allocate_file_backed_region(LinearAddress laddr, size_t size, R
Vector<RetainPtr<PhysicalPage>> physical_pages;
physical_pages.resize(page_count); // Start out with no physical pages!
m_regions.append(adopt(*new Region(laddr, size, move(physical_pages), move(name), is_readable, is_writable)));
m_regions.last()->m_vnode = move(vnode);
m_regions.append(adopt(*new Region(laddr, size, move(vnode), move(name), is_readable, is_writable)));
MM.mapRegion(*this, *m_regions.last());
return m_regions.last().ptr();
}