Xv6 Labs 2025 Page Tables

Permissions:

• PTE_R allows page to be read.
• PTE_W allows page to be written.
• PTE_U allows page to be accessed by user.
• PTE_V left clear in unused PTEs, which seems to be VALID flag.

Things to remember:

• Set correct and as small as possible permission for memory pages.

I don’t know whether should I add a function to detect which level I had walked to.