/* * Copyright (c) 2021, Liav A. * * SPDX-License-Identifier: BSD-2-Clause */ #include "MemoryDevice.h" #include #include #include #include #include namespace Kernel { UNMAP_AFTER_INIT MemoryDevice::MemoryDevice() : CharacterDevice(1, 1) { } UNMAP_AFTER_INIT MemoryDevice::~MemoryDevice() { } KResultOr MemoryDevice::read(FileDescription&, u64, UserOrKernelBuffer&, size_t) { TODO(); } void MemoryDevice::did_seek(FileDescription&, off_t) { TODO(); } KResultOr MemoryDevice::mmap(Process& process, FileDescription&, const Range& 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 vmobject = AnonymousVMObject::create_for_physical_range(viewed_address, range.size()); if (!vmobject) return ENOMEM; dbgln("MemoryDevice: Mapped physical memory at {} for range of {} bytes", viewed_address, range.size()); return process.space().allocate_region_with_vmobject( range, vmobject.release_nonnull(), 0, "Mapped Physical Memory", prot, shared); } }