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79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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&, size_t, 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, size_t 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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