Switching from user mode to kernel mode requires a privileged assembly instruction

The administrator (i.e., root) of a machine can only execute privileged assembly instructions

Privileged assembly instructions can be executed only in user mode

Interrupt handlers are executed in kernel mode

System calls are executed in kernel model

2 - 5%

> 25%

10 - 20%

< 1%

Une brèche orbitaire

Une plaie de l'artère sphéno palatine

Une plaie du nerf optique

Une brèche ostéo méningée