Cortex-A8 Technical Reference Manual - ARM Information Center

System Control Coprocessor
a. An entry of Undefined in the table means that the access gives an Undefined Instruction exception when the coprocessor
instruction is executed.
3.2.67 c11, PLE Context ID Register
PLE bit
To access the PLE Channel Status Register, set PLE Channel Number Register to the
appropriate PLE channel and read CP15 with:
MRC p15, 0, , c11, c8, 0 ; Read PLE Channel Status Register
For more details on the operation of the L2 PreLoad Engine (PLE), see L2 PLE on page 8-6.
The PLE Context ID Register for each channel contains the processor context ID of the process
that uses that channel.
The PLE Context ID Register is:
• a read/write register for each PLE channel common to Secure and Nonsecure states
• accessible in privileged modes only.
Figure 3-60 shows the bit arrangement of the PLE Context ID Register.
31 8 7
0
Figure 3-60 PLE Context ID Register format
Table 3-134 shows how the bit values correspond with the PLE Context ID Register functions.
Bits Field Function
PROCID
Access in the Nonsecure state depends on the PLE bit, see c1, Nonsecure Access Control
Register on page 3-56. Table 3-135 shows the results of attempted access for each mode.
To access the PLE Context ID Register in a privileged mode, set the PLE Channel Number
Register to the appropriate PLE channel and read or write CP15 with:
MRC p15, 0, , c11, c15, 0 ; Read PLE Context ID Register
MCR p15, 0, , c11, c15, 0 ; Write PLE Context ID Register
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ASID
Table 3-134 PLE Context ID Register bit functions
[31:8] PROCID Extends the ASID to form the process ID and identifies the current process
[7:0] ASID Holds the ASID of the current process and identifies the current ASID
Table 3-135 Results of access to the PLE Context ID Register a
Secure privileged Nonsecure privileged Secure User Nonsecure User
Read Write Read Write Read Write Read Write
0 Data Data Undefined Undefined Undefined Undefined Undefined Undefined
1 Data Data Data Data Undefined Undefined Undefined Undefined
a. An entry of Undefined in the table means that the access gives an Undefined Instruction exception when the coprocessor
instruction is executed.