Here is a list of all documented variables with links to the documentation:

• ___SETUP_AP_END__ : startup_ap.h
• ___SETUP_AP_START__ : startup_ap.h
• copyout : output.h
• dout : output.h
• interrupt_entry : handler.h
• setup_ap_gdt : startup_ap.h
• setup_ap_gdtd : startup_ap.h