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#ifndef TEACHOS_KAPI_MEMORY_PAGE_HPP
#define TEACHOS_KAPI_MEMORY_PAGE_HPP
#include "kapi/memory/address.hpp"
#include <compare>
#include <cstddef>
namespace teachos::memory
{
extern std::size_t const PLATFORM_PAGE_SIZE;
struct page
{
constexpr page() = default;
explicit constexpr page(std::size_t number)
: m_number{number}
{}
/**
* @brief Returns the virtual page the given address is contained in.
*
* @param address Linear address we want to get the corresponding virtual page for.
* @return Page the given address is contained in.
*/
constexpr auto static containing(linear_address address) noexcept -> page
{
return page{address.raw() / PLATFORM_PAGE_SIZE};
}
/**
* @brief Get the start address of this virtual page.
*
* @return Start address of the virtual page.
*/
[[nodiscard]] constexpr auto start_address() const noexcept -> linear_address
{
return linear_address{m_number * PLATFORM_PAGE_SIZE};
}
/**
* @brief Check if this page refers to the same page as @p other.
*/
constexpr auto operator==(page const & other) const noexcept -> bool = default;
/**
* @brief Lexicographically compare this page to @p other.
*/
constexpr auto operator<=>(page const & other) const noexcept -> std::strong_ordering = default;
private:
std::size_t m_number{};
};
} // namespace teachos::memory
#endif
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