mirror of
https://github.com/RGBCube/serenity
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4bfd6e41b9
This makes for nicer handling of errors compared to checking whether a RefPtr is null. Additionally, this will give way to return different types of errors in the future.
64 lines
1.8 KiB
C++
64 lines
1.8 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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#include <AK/Memory.h>
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#include <AK/StdLibExtras.h>
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#include <Kernel/Arch/PC/BIOS.h>
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#include <Kernel/Devices/MemoryDevice.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Sections.h>
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namespace Kernel {
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UNMAP_AFTER_INIT NonnullRefPtr<MemoryDevice> MemoryDevice::must_create()
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{
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return adopt_ref(*new MemoryDevice);
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}
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UNMAP_AFTER_INIT MemoryDevice::MemoryDevice()
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: CharacterDevice(1, 1)
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{
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}
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UNMAP_AFTER_INIT MemoryDevice::~MemoryDevice()
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{
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}
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KResultOr<size_t> MemoryDevice::read(FileDescription&, u64, UserOrKernelBuffer&, size_t)
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{
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TODO();
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}
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void MemoryDevice::did_seek(FileDescription&, off_t)
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{
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TODO();
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}
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KResultOr<Memory::Region*> MemoryDevice::mmap(Process& process, FileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
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{
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auto viewed_address = PhysicalAddress(offset);
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dbgln("MemoryDevice: Trying to mmap physical memory at {} for range of {} bytes", viewed_address, range.size());
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if (!MM.is_allowed_to_mmap_to_userspace(viewed_address, range)) {
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dbgln("MemoryDevice: Trying to mmap physical memory at {} for range of {} bytes failed due to violation of access", viewed_address, range.size());
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return EINVAL;
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}
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auto maybe_vmobject = Memory::AnonymousVMObject::try_create_for_physical_range(viewed_address, range.size());
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if (maybe_vmobject.is_error())
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return maybe_vmobject.error();
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dbgln("MemoryDevice: Mapped physical memory at {} for range of {} bytes", viewed_address, range.size());
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return process.address_space().allocate_region_with_vmobject(
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range,
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maybe_vmobject.release_value(),
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0,
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"Mapped Physical Memory",
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prot,
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shared);
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}
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}
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