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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Leon Albrecht <leon2002.la@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Vector.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Memory/VirtualRange.h>
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#include <LibC/limits.h>
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namespace Kernel::Memory {
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Vector<VirtualRange, 2> VirtualRange::carve(VirtualRange const& taken) const
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{
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VERIFY((taken.size() % PAGE_SIZE) == 0);
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Vector<VirtualRange, 2> parts;
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if (taken == *this)
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return {};
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if (taken.base() > base())
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parts.append({ base(), taken.base().get() - base().get() });
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if (taken.end() < end())
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parts.append({ taken.end(), end().get() - taken.end().get() });
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return parts;
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}
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VirtualRange VirtualRange::intersect(VirtualRange const& other) const
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{
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if (*this == other) {
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return *this;
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}
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auto new_base = max(base(), other.base());
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auto new_end = min(end(), other.end());
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VERIFY(new_base < new_end);
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return VirtualRange(new_base, (new_end - new_base).get());
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}
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ErrorOr<VirtualRange> VirtualRange::expand_to_page_boundaries(FlatPtr address, size_t size)
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{
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if (page_round_up_would_wrap(size))
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return EINVAL;
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if ((address + size) < address)
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return EINVAL;
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if (page_round_up_would_wrap(address + size))
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return EINVAL;
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auto base = VirtualAddress { address }.page_base();
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auto end = page_round_up(address + size);
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return VirtualRange { base, end - base.get() };
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}
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}
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