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#include "kernel/test_support/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 physical_size, kstd::units::bytes virtual_size)
: memory{physical_size, virtual_size}
{}
auto page_mapper::map(kapi::memory::page page, kapi::memory::frame frame, flags) -> std::byte *
{
auto result = page_mappings.insert({page.number(), frame});
if (!result.second)
{
auto error = std::format("Page {} was already mapped!", page.number());
throw std::invalid_argument{error};
}
auto page_address = page.start_address();
auto virtual_base = memory.virtual_base();
auto virtual_end = virtual_base + memory.virtual_size();
if (page_address >= virtual_base && page_address < virtual_end)
{
auto virtual_target = static_cast<std::byte *>(page_address);
auto physical_offset = frame.number() * kapi::memory::frame::size;
return memory.map(kapi::memory::page::size, virtual_target, physical_offset.value);
}
else if (page_address >= kapi::memory::mmio_base)
{
throw std::runtime_error("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.physical_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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