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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Types.h>
#ifdef KERNEL
# include <Kernel/Memory/VirtualAddress.h>
#endif
namespace AK {
template<typename T>
concept PointerTypeName = IsPointer<T>;
template<PointerTypeName T>
class Userspace {
public:
Userspace() = default;
// Disable default implementations that would use surprising integer promotion.
bool operator==(Userspace const&) const = delete;
bool operator<=(Userspace const&) const = delete;
bool operator>=(Userspace const&) const = delete;
bool operator<(Userspace const&) const = delete;
bool operator>(Userspace const&) const = delete;
#ifdef KERNEL
Userspace(FlatPtr ptr)
: m_ptr(ptr)
{
}
explicit operator bool() const { return m_ptr != 0; }
FlatPtr ptr() const { return m_ptr; }
VirtualAddress vaddr() const { return VirtualAddress(m_ptr); }
T unsafe_userspace_ptr() const { return reinterpret_cast<T>(m_ptr); }
#else
Userspace(T ptr)
: m_ptr(ptr)
{
}
explicit operator bool() const { return m_ptr != nullptr; }
T ptr() const { return m_ptr; }
#endif
private:
#ifdef KERNEL
FlatPtr m_ptr { 0 };
#else
T m_ptr { nullptr };
#endif
};
template<typename T, typename U>
inline Userspace<T> static_ptr_cast(Userspace<U> const& ptr)
{
#ifdef KERNEL
auto casted_ptr = static_cast<T>(ptr.unsafe_userspace_ptr());
#else
auto casted_ptr = static_cast<T>(ptr.ptr());
#endif
return Userspace<T>(reinterpret_cast<FlatPtr>(casted_ptr));
}
}
#if USING_AK_GLOBALLY
using AK::static_ptr_cast;
using AK::Userspace;
#endif
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