mirror of
https://github.com/RGBCube/serenity
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cf16b2c8e6
This forces anyone who wants to look into and/or manipulate an address space to lock it. And this replaces the previous, more flimsy, manual spinlock use. Note that pointers *into* the address space are not safe to use after you unlock the space. We've got many issues like this, and we'll have to track those down as wlel.
37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel {
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class MemoryDevice final : public CharacterDevice {
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friend class DeviceManagement;
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public:
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static NonnullLockRefPtr<MemoryDevice> must_create();
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~MemoryDevice();
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virtual ErrorOr<Memory::Region*> mmap(Process&, Memory::AddressSpace&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
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private:
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MemoryDevice();
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virtual StringView class_name() const override { return "MemoryDevice"sv; }
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virtual bool can_read(OpenFileDescription const&, u64) const override { return true; }
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virtual bool can_write(OpenFileDescription const&, u64) const override { return false; }
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virtual bool is_seekable() const override { return true; }
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override { return EINVAL; }
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bool is_allowed_range(PhysicalAddress, Memory::VirtualRange const&) const;
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};
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}
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