Arm® Architecture Reference Manual Supplement Armv8, for Armv8-R AArch64 architecture profile Copyright © 2019-2020 Arm Limited or its affiliates. All rights reserved. ARM DDI 0600A.c (ID090320) Arm Architecture Reference Manual Supplement Armv8, for Armv8-R AArch64 architecture profile Copyright © 2019-2020 Arm Limited or its affiliates. All rights reserved. Release Information The following changes have been made to this document. Release history Date Issue Confidentiality Change 14 January 2020 A.a Confidential Beta release 19 June 2020 A.b Confidential Second beta release 7 September 2020 A.c Non-Confidential Initial EAC release of the PMSA architecture, first Beta release of the VMSA architecture Proprietary Notice This document is protected by copyright and other related rights and the practice or implementation of the information contained in this document may be protected by one or more patents or pending patent applications. 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Company 02557590 registered in England. 110 Fulbourn Road, Cambridge, England CB1 9NJ. (LES-PRE-20349 version 21.0) In this document, where the term Arm is used to refer to the company it means “Arm or any of its affiliates as appropriate”. ii Copyright © 2019-2020 Arm Limited or its affiliates. All rights reserved. ARM DDI 0600A.c Non-Confidential ID090320 Note • The term Arm can refer to versions of the Arm architecture, for example Armv8 refers to version 8 of the Arm architecture. The context makes it clear when the term is used in this way. • This document describes only the Armv8-R AArch64 architecture profile. For the behaviors required by the Armv8-A architecture, see the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile. Confidentiality Status This document is Non-Confidential. The right to use, copy and disclose this document may be subject to license restrictions in accordance with the terms of the agreement entered into by Arm and the party that Arm delivered this document to. Product Status This manual covers two memory system architectures, Protected Memory System Architecture (PMSAv8-64) and Virtual Memory System Architecture (VMSAv8-64). The information related to PMSAv8-64 as described in Chapter C1 Protected Memory System Architecture is at EAC quality. EAC quality means that all features of the specification are described in the manual. The information related to VMSAv8-64 as described in Chapter D1 Virtual Memory System Architecture is at Beta quality. Beta quality means that: • All major features of the specification are described in the manual, some details might be missing. • Information can be used for software development at risk. • Information should not be used for hardware development. Web Address http://www.arm.com Limitations of this issue This issue of the Arm® Architecture Reference Manual Supplement Armv8, for Armv8-R AArch64 architecture profile contains many improvements and corrections. Validation of this document has identified the following issues that Arm will address in future issues: • The references to LDLAR, LDLARH, and SMC instructions are present in register descriptions. •In Part I Architectural Pseudocode: — The functions that address both AArch32 and AArch64 functionality might contain cases, comments, or references that apply to only AArch32 state, EL3 Exception level, Monitor mode, Non-secure state, or other features that are not supported in Armv8-R AArch64, and are therefore not applicable to the Armv8-R AArch64 architecture. — Some functions and comments might contain information that is related to the short-descriptor format that is not applicable to the Armv8-R AArch64 architecture. • Assertions that are not applicable to Armv8-R AArch64 might be present. • Enumerations might contain values that are not applicable to Armv8-R AArch64. • Tests might contain clauses that always return TRUE or FALSE in AArch64 state and there could be potentially redundant tests in the Armv8-R AArch64 architecture. For example, in Armv8-R AArch64: — UsingAArch32() always returns FALSE. — IsSecure always returns TRUE. ARM DDI 0600A.c Copyright © 2019-2020 Arm Limited or its affiliates. All rights reserved. iii ID090320 Non-Confidential iv Copyright © 2019-2020 Arm Limited or its affiliates. All rights reserved. ARM DDI 0600A.c Non-Confidential ID090320 Contents Arm Architecture Reference Manual Supplement Armv8, for Armv8-R AArch64 architecture profile Preface About this supplement ................................................................................................. x Using this book ........................................................................................................... xi Conventions .............................................................................................................. xiii Additional reading ..................................................................................................... xiv Feedback .................................................................................................................. xv Part A Introduction and Architecture Overview Chapter A1 Architecture Overview A1.1 About the Armv8 architecture .............................................................................. A1-20 A1.2 Architecture profiles ............................................................................................ A1-21 A1.3 The Armv8-R AArch64 architecture profile .......................................................... A1-22 A1.4 Architecture extensions ....................................................................................... A1-23 A1.5 Supported extensions in Armv8-R AArch64 ........................................................ A1-26 Part B Differences between the Armv8-A AArch64 and the Armv8-R AArch64 Profiles Chapter B1 Differences between the Armv8-A AArch64 and the Armv8-R AArch64 Profiles B1.1 Differences from the Armv8-A AArch64 application level architecture ................ B1-30 B1.2 Differences from the Armv8-A AArch64 system level architecture ...................... B1-31 ARM DDI 0600A.c Copyright © 2019-2020 Arm Limited or its affiliates. All rights reserved. v ID090320 Non-Confidential Part C Armv8-R AArch64 Protected Memory System Architec- ture Chapter C1 Protected Memory System Architecture C1.1 About the Protected Memory System Architecture ............................................ C1-36 C1.2 Memory Protection Unit ....................................................................................... C1-37 C1.3 Address translation regimes ................................................................................ C1-38 C1.4 Default memory map ........................................................................................... C1-39 C1.5 Armv8-A memory view ....................................................................................... C1-40