Method MapMMIO

src/memory/virtual_memory.cpp:56–72

}

auto VirtualMemory::MapMMIO(uint64_t phys_addr, size_t size, uint32_t flags)
    -> Expected<void*> {
  // 计算对齐后的起始和结束页
  auto start_page = cpu_io::virtual_memory::PageAlign(phys_addr);
  auto end_page = cpu_io::virtual_memory::PageAlignUp(phys_addr + size);

  // 遍历并映射
  for (uint64_t addr = start_page; addr < end_page;
       addr += cpu_io::virtual_memory::kPageSize) {
    auto result = MapPage(kernel_page_dir_, reinterpret_cast<void*>(addr),
                          reinterpret_cast<void*>(addr), flags);
    if (!result.has_value()) {
      return std::unexpected(result.error());
    }
  }
  return reinterpret_cast<void*>(phys_addr);
}

auto VirtualMemory::MapPage(void* page_dir, void* virtual_addr,
                            void* physical_addr, uint32_t flags)