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SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
59 lines
1.6 KiB
C++
59 lines
1.6 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/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 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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