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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
#include <Kernel/VirtualAddress.h>
namespace UserspaceEmulator {
class Range {
friend class RangeAllocator;
public:
Range() = delete;
Range(VirtualAddress base, size_t size)
: m_base(base)
, m_size(size)
{
}
VirtualAddress base() const { return m_base; }
size_t size() const { return m_size; }
bool is_valid() const { return !m_base.is_null(); }
bool contains(VirtualAddress vaddr) const { return vaddr >= base() && vaddr < end(); }
VirtualAddress end() const { return m_base.offset(m_size); }
bool operator==(const Range& other) const
{
return m_base == other.m_base && m_size == other.m_size;
}
bool contains(VirtualAddress base, size_t size) const
{
if (base.offset(size) < base)
return false;
return base >= m_base && base.offset(size) <= end();
}
bool contains(const Range& other) const
{
return contains(other.base(), other.size());
}
Vector<Range, 2> carve(const Range&) const;
Range split_at(VirtualAddress address)
{
VERIFY(address.is_page_aligned());
VERIFY(m_base < address);
size_t new_size = (address - m_base).get();
VERIFY(new_size < m_size);
size_t other_size = m_size - new_size;
m_size = new_size;
return { address, other_size };
}
private:
VirtualAddress m_base;
size_t m_size { 0 };
};
}
namespace AK {
template<>
struct Traits<UserspaceEmulator::Range> : public GenericTraits<UserspaceEmulator::Range> {
static constexpr bool is_trivial() { return true; }
};
}
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