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https://github.com/RGBCube/serenity
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4b847810bf
Add a MappedROM::find_chunk_starting_with() helper since that's a very common usage pattern in clients of this code. Also convert MultiProcessorParser from a persistent singleton object to a temporary object constructed via a failable factory function.
54 lines
2.2 KiB
C++
54 lines
2.2 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/OwnPtr.h>
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#include <Kernel/VM/Region.h>
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namespace Kernel {
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struct MappedROM {
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const u8* base() const { return region->vaddr().offset(offset).as_ptr(); }
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const u8* 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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for (auto* candidate = base(); candidate < end(); 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(const u8* ptr) const { return paddr.offset(ptr - this->base()); }
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};
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}
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