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#include "kernel/test_support/page_mapper.hpp"
#include "kapi/memory.hpp"
#include <kstd/units>
#include <cstddef>
#include <format>
#include <stdexcept>
#include <sys/mman.h>
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 *
{
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 sandbox_start = memory.heap_base();
auto sandbox_end = sandbox_start + memory.heap_size();
if (page_address >= sandbox_start && page_address < sandbox_end)
{
auto virtual_target = static_cast<std::byte *>(page_address);
auto physical_offset = frame.number() * kapi::memory::frame::size;
auto mapped_ptr = mmap(virtual_target, kapi::memory::page::size.value, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FIXED, memory.memory_descriptor(), physical_offset.value);
if (mapped_ptr == MAP_FAILED)
{
throw std::runtime_error("Failed to map page");
}
return static_cast<std::byte *>(mapped_ptr);
}
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.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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