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- /*
- * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/Memory.h>
- #include <AK/StdLibExtras.h>
- #include <Kernel/Arch/PC/BIOS.h>
- #include <Kernel/Devices/MemoryDevice.h>
- #include <Kernel/Memory/AnonymousVMObject.h>
- #include <Kernel/Sections.h>
- namespace Kernel {
- UNMAP_AFTER_INIT NonnullRefPtr<MemoryDevice> MemoryDevice::must_create()
- {
- return adopt_ref(*new MemoryDevice);
- }
- UNMAP_AFTER_INIT MemoryDevice::MemoryDevice()
- : CharacterDevice(1, 1)
- {
- }
- UNMAP_AFTER_INIT MemoryDevice::~MemoryDevice()
- {
- }
- KResultOr<size_t> MemoryDevice::read(FileDescription&, u64, UserOrKernelBuffer&, size_t)
- {
- TODO();
- }
- void MemoryDevice::did_seek(FileDescription&, off_t)
- {
- TODO();
- }
- KResultOr<Memory::Region*> MemoryDevice::mmap(Process& process, FileDescription&, Memory::VirtualRange const& range, u64 offset, int prot, bool shared)
- {
- auto viewed_address = PhysicalAddress(offset);
- dbgln("MemoryDevice: Trying to mmap physical memory at {} for range of {} bytes", viewed_address, range.size());
- if (!MM.is_allowed_to_mmap_to_userspace(viewed_address, range)) {
- dbgln("MemoryDevice: Trying to mmap physical memory at {} for range of {} bytes failed due to violation of access", viewed_address, range.size());
- return EINVAL;
- }
- auto maybe_vmobject = Memory::AnonymousVMObject::try_create_for_physical_range(viewed_address, range.size());
- if (maybe_vmobject.is_error())
- return maybe_vmobject.error();
- dbgln("MemoryDevice: Mapped physical memory at {} for range of {} bytes", viewed_address, range.size());
- return process.address_space().allocate_region_with_vmobject(
- range,
- maybe_vmobject.release_value(),
- 0,
- "Mapped Physical Memory",
- prot,
- shared);
- }
- }
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