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#include "arch/memory/page_table.hpp"
#include "kapi/memory.hpp"
#include <algorithm>
#include <bit>
#include <cstddef>
#include <cstdint>
#include <optional>
#include <utility>
namespace arch::memory
{
auto page_table::entry::clear() noexcept -> void
{
m_raw = 0;
}
auto page_table::entry::present() const noexcept -> bool
{
return (all_flags() & flags::present) != flags::empty;
}
auto page_table::entry::huge() const noexcept -> bool
{
return (all_flags() & flags::huge_page) != flags::empty;
}
auto page_table::entry::all_flags() const noexcept -> flags
{
return std::bit_cast<flags>(m_raw & ~frame_number_mask);
}
auto page_table::entry::all_flags(flags flags) noexcept -> void
{
m_raw = (m_raw & ~frame_number_mask) | std::to_underlying(flags);
}
auto page_table::entry::operator|=(flags rhs) noexcept -> page_table::entry &
{
auto raw_flags = std::to_underlying(rhs) & ~frame_number_mask;
m_raw |= raw_flags;
return *this;
}
auto page_table::entry::frame() const noexcept -> std::optional<kapi::memory::frame>
{
if (present())
{
return kapi::memory::frame::containing(kapi::memory::physical_address{m_raw & frame_number_mask});
}
return std::nullopt;
}
auto page_table::entry::frame(kapi::memory::frame frame, flags flags) noexcept -> void
{
m_raw = (frame.start_address().raw() | static_cast<std::uint64_t>(flags));
};
auto page_table::operator[](std::size_t index) -> entry &
{
return m_entries.at(index);
}
auto page_table::operator[](std::size_t index) const -> entry const &
{
return m_entries.at(index);
}
auto page_table::clear() noexcept -> void
{
std::ranges::for_each(m_entries, &page_table::entry::clear);
}
auto page_table::empty() const noexcept -> bool
{
return std::ranges::all_of(m_entries,
[](auto const & entry) -> auto { return entry.all_flags() == entry::flags::empty; });
}
} // namespace arch::memory
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