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Kernel/Memory: Introduce the SharedFramebufferVMObject class

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This new type of VMObject will be used to coordinate switching safely
from graphical mode to text mode and vice-versa, by supplying a way to
remap all Regions that were created with this object, so mappings can be
changed according to the given state of system mode. This makes it quite
easy to give applications like WindowServer the feeling of having full
access to the framebuffer device from a DisplayConnector, but still keep
the Kernel in control to be able to safely switch to text console.
This commit is contained in:
Liav A 2022-05-13 03:22:23 +03:00 • committed by Linus Groh
parent ec925cbb89
commit 3d22917548
5 changed files with 219 additions and 2 deletions
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5
Kernel/Memory/VMObject.h
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@ -34,8 +34,9 @@ public:
virtual bool is_private_inode() const { return false; }
size_t page_count() const { return m_physical_pages.size(); }
Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
Span<RefPtr<PhysicalPage>> physical_pages() { return m_physical_pages.span(); }
virtual Span<RefPtr<PhysicalPage> const> physical_pages() const { return m_physical_pages.span(); }
virtual Span<RefPtr<PhysicalPage>> physical_pages() { return m_physical_pages.span(); }
size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }