mirror of
https://github.com/SerenityOS/serenity
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75564b4a5f
This expands the reach of error propagation greatly throughout the kernel. Sadly, it also exposes the fact that we're allocating (and doing other fallible things) in constructors all over the place. This patch doesn't attempt to address that of course. That's work for our future selves.
52 lines
1.5 KiB
C++
52 lines
1.5 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/StringView.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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const T* ptr() const { return reinterpret_cast<const T*>(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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const T* operator->() const { return ptr(); }
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T* operator->() { return ptr(); }
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const T& operator*() const { return *ptr(); }
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T& operator*() { return *ptr(); }
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OwnPtr<Region> region;
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size_t offset { 0 };
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};
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template<typename T>
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static 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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size_t mapping_length = page_round_up(paddr.offset_in_page() + length);
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auto region_or_error = MM.allocate_kernel_region(paddr.page_base(), mapping_length, {}, access);
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if (region_or_error.is_error())
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TODO();
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table.region = region_or_error.release_value();
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table.offset = paddr.offset_in_page();
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return table;
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}
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template<typename T>
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static 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 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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