Samsung S5PC100, User Manual, Page: 1759 / 1863

SECURE DOMAIN MANAGER S5PC100 USER’S MANUAL (REV1.0)
11.2-2
1.2 SDM DESIGN CONCEPT
The secure domain manager provides the switching function between non-secure domain and secure domain
through the predefined secure domain manage program in order to ensure the trusted execution of secure
program. If a request is made to secure program, the secure domain manager switchs from non-secure domain to
secure domain by DMZ entrance sequences that sets up the secure program execution environment. After secure
program is complete, it changes mode to non-secure domain by DMZ exit sequences that set up the normal
program execution environment.
The purpose of switching over the special domain for secure program is to protect the secure resources of system
from normal program that may have threat codes, by permitting only secure program to access secure resources.
•
Secure Domain: State from secure boot state and DMZ entrance to end of the secure programs, and all
slave & memory areas are accessible.
•
Non-Secure Domain: All other state except the secure boot state, DMZ, and the secure domain state, and
only the non-secure slave & memory areas are accessible.
•
DMZ: All mode changes program sequence is progressing in DMZ state, and all slave & memory areas are
accessible.
♦
DMZ entrance state: non-secure to secure mode transition
♦
DMZ exit state: secure to non-secure mode transition.
Figure 11.2-2 Rsource Access in Non-Secure/ Secure Domain