Table 3-151 Access Permissions Apx And Ap Bit Fields Encoding; Table 3-152 Tlb Lockdown Attributes Register Bit Functions; Figure 3-79 Tlb Lockdown Attributes Register Format - ARM ARM1176JZF-S Technical Reference Manual

Bits Field name
[3] APX
[2:1] AP
[0] V
APX AP
0 b00
0 b01
0 b10
0 b11
1 b00
1 b01
1 b10
1 b11
Bits Field name
[31:30] AP3
[29:28] AP2
[27:26] AP1
ARM DDI 0301H
ID012310
Table 3-150 TLB Lockdown PA Register bit functions (continued)
Function
Access permissions extension bit.
Defines the access permissions for this page table entry. See Table 3-151.
Access permissions, or first sub-page access permissions if the page table entry supports
sub-pages.
Indicates if this page table entry is valid:
0 = Entry is not valid
1 = Entry is valid.
Table 3-151 lists the encoding for the access permissions for bit fields APX and AP.
Supervisor permissions
No access
Read/write
Read/write
Read/write
No access
Read only
Read only
Read only
Figure 3-79 shows the arrangement of bits in the TLB Lockdown Attributes Register.
31 30 29 28 27 26 25 24
S
AP3 AP2 AP1 P
V
Table 3-152 lists how the bit values correspond with the TLB Lockdown Attributes Register
functions.
Function
Sub-page access permissions for the fourth sub-page. If the page table entry does not support
sub-pages this field Should Be Zero.
Sub-page access permissions for the third sub-page. If the page table entry does not support
sub-pages this field Should Be Zero.
Sub-page access permissions for the second sub-page. If the page table entry does not support
sub-pages this field Should Be Zero.
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Table 3-151 Access permissions APX and AP bit fields encoding

User permissions Access type
No access All accesses generate a permission fault
No access Supervisor access only
Read only Writes in user mode generate permission faults
Read/write Full access
No access Domain fault encoded field
No access Supervisor read only
Read only Supervisor/User read only
Read only Supervisor/User read only
SBZ

Figure 3-79 TLB Lockdown Attributes Register format

Table 3-152 TLB Lockdown Attributes Register bit functions

System Control Coprocessor
11 10 7 6 5 3
X
Domain TEX
N
2 1 0
C B S
3-151