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29f9a38f76
Instead, try to create the device objects in separate static methods, and if we fail for some odd reason to allocate memory for such devices, just panic with that reason.
64 lines
1.7 KiB
C++
64 lines
1.7 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 "MemoryDevice.h"
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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/Panic.h>
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#include <Kernel/VM/AnonymousVMObject.h>
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#include <Kernel/VM/TypedMapping.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_if_nonnull(new MemoryDevice).release_nonnull();
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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<Region*> MemoryDevice::mmap(Process& process, FileDescription&, const Range& 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 vmobject = AnonymousVMObject::create_for_physical_range(viewed_address, range.size());
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if (!vmobject)
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return ENOMEM;
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dbgln("MemoryDevice: Mapped physical memory at {} for range of {} bytes", viewed_address, range.size());
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return process.space().allocate_region_with_vmobject(
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range,
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vmobject.release_nonnull(),
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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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