mirror of
https://github.com/RGBCube/serenity
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39 lines
1.1 KiB
C++
39 lines
1.1 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/OwnPtr.h>
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#include <Kernel/Memory/Region.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel::Memory {
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class MappedROM {
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public:
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u8 const* base() const { return region->vaddr().offset(offset).as_ptr(); }
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u8 const* end() const { return base() + size; }
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OwnPtr<Region> region;
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size_t size { 0 };
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size_t offset { 0 };
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PhysicalAddress paddr;
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Optional<PhysicalAddress> find_chunk_starting_with(StringView prefix, size_t chunk_size) const
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{
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auto prefix_length = prefix.length();
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if (size < prefix_length)
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return {};
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for (auto* candidate = base(); candidate <= end() - prefix_length; candidate += chunk_size) {
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if (!__builtin_memcmp(prefix.characters_without_null_termination(), candidate, prefix.length()))
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return paddr_of(candidate);
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}
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return {};
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}
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PhysicalAddress paddr_of(u8 const* ptr) const { return paddr.offset(ptr - this->base()); }
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};
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}
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