mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 07:30:19 +00:00
2c72d495a3
I believe this to be safe, as the main thing that LockRefPtr provides over RefPtr is safe copying from a shared LockRefPtr instance. I've inspected the uses of RefPtr<PhysicalPage> and it seems they're all guarded by external locking. Some of it is less obvious, but this is an area where we're making continuous headway.
94 lines
4.8 KiB
C++
94 lines
4.8 KiB
C++
/*
|
|
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <Kernel/Forward.h>
|
|
#include <Kernel/Memory/AllocationStrategy.h>
|
|
#include <Kernel/Memory/AnonymousVMObject.h>
|
|
#include <Kernel/Memory/MemoryManager.h>
|
|
#include <Kernel/Memory/PageFaultResponse.h>
|
|
#include <Kernel/PhysicalAddress.h>
|
|
|
|
namespace Kernel::Memory {
|
|
|
|
class SharedFramebufferVMObject final : public VMObject {
|
|
public:
|
|
class FakeWritesFramebufferVMObject final : public VMObject {
|
|
public:
|
|
static ErrorOr<NonnullLockRefPtr<FakeWritesFramebufferVMObject>> try_create(Badge<SharedFramebufferVMObject>, SharedFramebufferVMObject const& parent_object);
|
|
|
|
private:
|
|
FakeWritesFramebufferVMObject(SharedFramebufferVMObject const& parent_object, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages)
|
|
: VMObject(move(new_physical_pages))
|
|
, m_parent_object(parent_object)
|
|
{
|
|
}
|
|
virtual StringView class_name() const override { return "FakeWritesFramebufferVMObject"sv; }
|
|
virtual ErrorOr<NonnullLockRefPtr<VMObject>> try_clone() override { return Error::from_errno(ENOTIMPL); }
|
|
virtual Span<RefPtr<PhysicalPage> const> physical_pages() const override { return m_parent_object->fake_sink_framebuffer_physical_pages(); }
|
|
virtual Span<RefPtr<PhysicalPage>> physical_pages() override { return m_parent_object->fake_sink_framebuffer_physical_pages(); }
|
|
NonnullLockRefPtr<SharedFramebufferVMObject> m_parent_object;
|
|
};
|
|
|
|
class RealWritesFramebufferVMObject final : public VMObject {
|
|
public:
|
|
static ErrorOr<NonnullLockRefPtr<RealWritesFramebufferVMObject>> try_create(Badge<SharedFramebufferVMObject>, SharedFramebufferVMObject const& parent_object);
|
|
|
|
private:
|
|
RealWritesFramebufferVMObject(SharedFramebufferVMObject const& parent_object, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages)
|
|
: VMObject(move(new_physical_pages))
|
|
, m_parent_object(parent_object)
|
|
{
|
|
}
|
|
virtual StringView class_name() const override { return "RealWritesFramebufferVMObject"sv; }
|
|
virtual ErrorOr<NonnullLockRefPtr<VMObject>> try_clone() override { return Error::from_errno(ENOTIMPL); }
|
|
virtual Span<RefPtr<PhysicalPage> const> physical_pages() const override { return m_parent_object->real_framebuffer_physical_pages(); }
|
|
virtual Span<RefPtr<PhysicalPage>> physical_pages() override { return m_parent_object->real_framebuffer_physical_pages(); }
|
|
NonnullLockRefPtr<SharedFramebufferVMObject> m_parent_object;
|
|
};
|
|
|
|
virtual ~SharedFramebufferVMObject() override = default;
|
|
|
|
static ErrorOr<NonnullLockRefPtr<SharedFramebufferVMObject>> try_create_for_physical_range(PhysicalAddress paddr, size_t size);
|
|
static ErrorOr<NonnullLockRefPtr<SharedFramebufferVMObject>> try_create_at_arbitrary_physical_range(size_t size);
|
|
virtual ErrorOr<NonnullLockRefPtr<VMObject>> try_clone() override { return Error::from_errno(ENOTIMPL); }
|
|
|
|
void switch_to_fake_sink_framebuffer_writes(Badge<Kernel::DisplayConnector>);
|
|
void switch_to_real_framebuffer_writes(Badge<Kernel::DisplayConnector>);
|
|
|
|
virtual Span<RefPtr<PhysicalPage> const> physical_pages() const override;
|
|
virtual Span<RefPtr<PhysicalPage>> physical_pages() override;
|
|
|
|
Span<RefPtr<PhysicalPage>> fake_sink_framebuffer_physical_pages();
|
|
Span<RefPtr<PhysicalPage> const> fake_sink_framebuffer_physical_pages() const;
|
|
|
|
Span<RefPtr<PhysicalPage>> real_framebuffer_physical_pages();
|
|
Span<RefPtr<PhysicalPage> const> real_framebuffer_physical_pages() const;
|
|
|
|
FakeWritesFramebufferVMObject const& fake_writes_framebuffer_vmobject() const { return *m_fake_writes_framebuffer_vmobject; }
|
|
FakeWritesFramebufferVMObject& fake_writes_framebuffer_vmobject() { return *m_fake_writes_framebuffer_vmobject; }
|
|
|
|
RealWritesFramebufferVMObject const& real_writes_framebuffer_vmobject() const { return *m_real_writes_framebuffer_vmobject; }
|
|
RealWritesFramebufferVMObject& real_writes_framebuffer_vmobject() { return *m_real_writes_framebuffer_vmobject; }
|
|
|
|
private:
|
|
SharedFramebufferVMObject(FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, CommittedPhysicalPageSet, AnonymousVMObject& real_framebuffer_vmobject);
|
|
|
|
virtual StringView class_name() const override { return "SharedFramebufferVMObject"sv; }
|
|
|
|
ErrorOr<void> create_fake_writes_framebuffer_vm_object();
|
|
ErrorOr<void> create_real_writes_framebuffer_vm_object();
|
|
|
|
NonnullLockRefPtr<AnonymousVMObject> m_real_framebuffer_vmobject;
|
|
LockRefPtr<FakeWritesFramebufferVMObject> m_fake_writes_framebuffer_vmobject;
|
|
LockRefPtr<RealWritesFramebufferVMObject> m_real_writes_framebuffer_vmobject;
|
|
bool m_writes_are_faked { false };
|
|
mutable RecursiveSpinlock m_writes_state_lock { LockRank::None };
|
|
CommittedPhysicalPageSet m_committed_pages;
|
|
};
|
|
|
|
}
|