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#include "x86_64/memory/scoped_mapping.hpp"
#include "kapi/memory.hpp"
#include "kapi/system.hpp"
#include "x86_64/memory/mmu.hpp"
#include "x86_64/memory/page_table.hpp"
#include "x86_64/memory/paging_root.hpp"
#include <cstddef>
#include <utility>
namespace teachos::memory::x86_64
{
scoped_mapping::scoped_mapping(scoped_mapping && other) noexcept
: m_page{std::exchange(other.m_page, page{})}
, m_mapper{std::exchange(other.m_mapper, nullptr)}
, m_mapped{std::exchange(other.m_mapped, false)}
{}
scoped_mapping::scoped_mapping(page page, page_mapper & mapper)
: m_page{page}
, m_mapper{&mapper}
, m_mapped{false}
{
if (paging_root::get()->translate(page))
{
system::panic("[MEM] Tried to map a page that is already mapped!");
}
}
scoped_mapping::~scoped_mapping()
{
if (m_mapped)
{
unmap();
x86_64::tlb_flush(m_page.start_address());
}
}
auto scoped_mapping::operator=(scoped_mapping && other) noexcept -> scoped_mapping &
{
swap(*this, other);
return *this;
}
auto scoped_mapping::map(frame frame, page_table::entry::flags flags) -> std::byte *
{
auto result = m_mapper->map(m_page, frame, to_mapper_flags(flags));
m_mapped = true;
return result;
}
auto scoped_mapping::unmap() -> void
{
m_mapper->unmap(m_page);
m_mapped = false;
}
auto swap(scoped_mapping & lhs, scoped_mapping & rhs) -> void
{
using std::swap;
swap(lhs.m_page, rhs.m_page);
swap(lhs.m_mapper, rhs.m_mapper);
swap(lhs.m_mapped, rhs.m_mapped);
}
} // namespace teachos::memory::x86_64
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