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The lockdown_range Register characteristics are:
Controls the range of regions that are locked down.
The lockdown_select Register can restrict the access type of this register to RO. See Lockdown Select Register.
Available in all configurations of the TZASC.
See the register summary in Table 3.1.
Figure 3.4 shows the lockdown_range Register bit assignments.
Table 3.4 shows the lockdown_range Register bit assignments.
Table 3.4. lockdown_range Register bit assignments
| Bits | Name | Function |
|---|---|---|
| [31] | enable | When set to 1, it enables the lockdown_regions field to control the regions that are to be locked |
| [30:4] | - | Reserved, SBZ |
| [3:0] | lockdown_regions | Controls the number of regions to lockdown when the enable bit is set to 1: b0000 = region no_of_regions [a]-1 is locked b0001 = region no_of_regions-1 to region no_of_regions-2 are locked b0010 = region no_of_regions-1 to region no_of_regions-3 are locked b0011 = region no_of_regions-1 to region no_of_regions-4 are locked . . . b1111 = region no_of_regions-1 to region no_of_regions-16 are locked. |
[a] no_of_regions is the value of the no_of_regions field in the configuration Register. See Configuration Register. | ||
| Copyright © 2008, 2010 ARM Limited. All rights reserved. | ARM DDI 0431B |
| Non-Confidential | |
| PDF version | |
| Home > Programmers Model > Register descriptions > Lockdown Range Register |