mirror of
https://github.com/SerenityOS/serenity
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69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/NonnullOwnPtr.h>
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#include <AK/StringView.h>
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#include <AK/Try.h>
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#include <Kernel/Memory/MemoryManager.h>
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namespace Kernel::Memory {
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template<typename T>
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struct TypedMapping {
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T const* ptr() const { return reinterpret_cast<T const*>(region->vaddr().offset(offset).as_ptr()); }
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T* ptr() { return reinterpret_cast<T*>(region->vaddr().offset(offset).as_ptr()); }
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VirtualAddress base_address() const { return region->vaddr().offset(offset); }
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T const* operator->() const { return ptr(); }
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T* operator->() { return ptr(); }
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T const& operator*() const { return *ptr(); }
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T& operator*() { return *ptr(); }
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OwnPtr<Region> region;
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PhysicalAddress paddr;
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size_t offset { 0 };
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size_t length { 0 };
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};
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template<typename T>
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static ErrorOr<NonnullOwnPtr<TypedMapping<T>>> adopt_new_nonnull_own_typed_mapping(PhysicalAddress paddr, size_t length, Region::Access access = Region::Access::Read)
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{
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auto mapping_length = TRY(page_round_up(paddr.offset_in_page() + length));
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auto region = TRY(MM.allocate_kernel_region(paddr.page_base(), mapping_length, {}, access));
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auto table = TRY(adopt_nonnull_own_or_enomem(new (nothrow) Memory::TypedMapping<T>()));
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table->region = move(region);
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table->offset = paddr.offset_in_page();
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table->paddr = paddr;
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table->length = length;
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return table;
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}
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template<typename T>
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static ErrorOr<TypedMapping<T>> map_typed(PhysicalAddress paddr, size_t length, Region::Access access = Region::Access::Read)
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{
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TypedMapping<T> table;
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auto mapping_length = TRY(page_round_up(paddr.offset_in_page() + length));
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table.region = TRY(MM.allocate_kernel_region(paddr.page_base(), mapping_length, {}, access));
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table.offset = paddr.offset_in_page();
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table.paddr = paddr;
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table.length = length;
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return table;
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}
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template<typename T>
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static ErrorOr<TypedMapping<T>> map_typed(PhysicalAddress paddr)
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{
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return map_typed<T>(paddr, sizeof(T));
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}
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template<typename T>
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static ErrorOr<TypedMapping<T>> map_typed_writable(PhysicalAddress paddr)
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{
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return map_typed<T>(paddr, sizeof(T), Region::Access::Read | Region::Access::Write);
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}
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}
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