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#include "kernel/tests/page_mapper.hpp"
#include "kapi/memory.hpp"
#include <kstd/units>
#include <cstddef>
#include <format>
#include <stdexcept>
namespace kernel::tests
{
page_mapper::page_mapper(kstd::units::bytes memory_size)
: memory{memory_size}
{}
auto page_mapper::map(kapi::memory::page page, kapi::memory::frame frame, flags) -> std::byte *
{
page_mappings.insert({page.number(), frame});
auto page_address = page.start_address();
if (page_address >= kapi::memory::mmio_base)
{
throw std::invalid_argument{"MMIO mapping not yet supported in testing!"};
}
else if (page_address >= kapi::memory::higher_half_direct_map_base)
{
auto offset = frame.number() * kapi::memory::frame::size;
return memory.ram_base() + offset;
}
return nullptr;
}
auto page_mapper::unmap(kapi::memory::page page) -> void
{
if (!try_unmap(page))
{
auto error = std::format("Page {} was never mapped!", page.number());
throw std::invalid_argument{error};
}
}
auto page_mapper::try_unmap(kapi::memory::page page) noexcept -> bool
{
if (page_mappings.contains(page.number()))
{
page_mappings.erase(page.number());
return true;
}
return false;
}
} // namespace kernel::tests
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