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https://github.com/SerenityOS/serenity.git
synced 2026-11-07 12:38:38 -10:00
Sönke Holz
dc41d5bd0e
Instead of implementing this inline in find_rsdp_in_ia_pc_specific_memory_locations, let's add a member function that does this automatically.
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <[email protected]>
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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/Concepts.h>
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#include <AK/OwnPtr.h>
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#include <Kernel/Library/MiniStdLib.h>
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#include <Kernel/Memory/PhysicalAddress.h>
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#include <Kernel/Memory/Region.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, CallableAs<bool, ReadonlyBytes> auto predicate) const
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{
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PhysicalAddress start_paddr = PhysicalAddress { align_up_to(paddr.get(), chunk_size) };
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size_t start_offset = start_paddr.get() - paddr.get();
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for (size_t offset = start_offset; offset <= size - prefix.length(); offset += chunk_size) {
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u8 const* candidate = base() + offset;
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if (memcmp(prefix.characters_without_null_termination(), candidate, prefix.length()) != 0)
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continue;
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if (!predicate(ReadonlyBytes { candidate, size - offset }))
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continue;
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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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