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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Oct 2022 22:48:12.3806 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1cf0c26c-0999-4ac1-e6a1-08dab9ffa8b9 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000B8EE.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4925 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1667083730895100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Refer ARM DDI 0487G.b ID072021, B2.2.1 "Requirements for single-copy atomicity - A read that is generated by a load instruction that loads a single general-purpose register and is aligned to the size of the read in the instruction is single-copy atomic. -A write that is generated by a store instruction that stores a single general-purpose register and is aligned to the size of the write in the instruction is single-copy atomic" On AArch32, the alignment check is enabled at boot time by setting HSCTLR.A= bit. ("HSCTLR, Hyp System Control Register"). However in AArch64, alignment check is not enabled at boot time. Thus, one needs to check for alignment when performing atomic operations. Signed-off-by: Ayan Kumar Halder Reviewed-by: Michal Orzel