System Control
ARM DDI 0500D Copyright © 2013-2014 ARM. All rights reserved. 4-180
ID021414 Non-Confidential
Usage constraints This register is accessible as follows:
Must be interpreted with ID_ISAR0, ID_ISAR1, ID_ISAR2, ID_ISAR3,
and ID_ISAR5. See:
• Instruction Set Attribute Register 0 on page 4-172.
• Instruction Set Attribute Register 1 on page 4-173.
• Instruction Set Attribute Register 2 on page 4-175.
• Instruction Set Attribute Register 3 on page 4-178.
• Instruction Set Attribute Register 5 on page 4-181.
Configurations ID_ISAR4 is architecturally mapped to AArch64 register
ID_ISAR4_EL1. See AArch32 Instruction Set Attribute Register 4 on
page 4-34.
There is one copy of this register that is used in both Secure and
Non-secure states.
Attributes ID_ISAR4 is a 32-bit register.
Figure 4-90 shows the ID_ISAR4 bit assignments.
Figure 4-90 ID_ISAR4 bit assignments
EL0
(NS)
EL0
(S)
EL1
(NS)
EL1
(S)
EL2
EL3
(SCR.NS = 1)
EL3
(SCR.NS = 0)
--RORORORO RO
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