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{{arm title|ARMv8}}{{arm isa main}} | {{arm title|ARMv8}}{{arm isa main}} | ||
| − | '''ARMv8''' | + | '''ARMv8''' is the successor to {{\\|ARMv7}}, an [[ARM]] [[instruction set architecture]] announced in [[2011]] which brought a large number of fundumental changes to the instruction set, including the introduction of 64-bit operating capabilities. |
== Overview == | == Overview == | ||
Work on the ARMv8 started within the R&D group at [[ARM Holding|ARM]] in 2007. First disclosed in late 2011, the ARMv8 is a successor and an extension to the {{\\|ARMv7}} ISA. This architecture introduced new 64-bit operating capabilities, called ''{{arm|AArch64}}'', and defined a relationship to the prior 32-bit operating state, referred to as ''{{arm|AArch32}}'' (covering the {{arm|A32}} and {{arm|T32}} ISAs). Foundationally, ARMv8 extends the old architecture while maintaining compatibility with older revisions and extensions (e.g., {{arm|Thumb}}, {{arm|NEON}}, {{arm|VFP}}) when in AArch32. Additionally, ARMv8 introduced a number of enhancements to AArch32 which still maintains full compatibility with {{\\|ARMv7}}. Generally speaking, ARMv8 was designed such that a well-designed AArch64 [[phsyical core|core]] should also work well as an AArch32 core. | Work on the ARMv8 started within the R&D group at [[ARM Holding|ARM]] in 2007. First disclosed in late 2011, the ARMv8 is a successor and an extension to the {{\\|ARMv7}} ISA. This architecture introduced new 64-bit operating capabilities, called ''{{arm|AArch64}}'', and defined a relationship to the prior 32-bit operating state, referred to as ''{{arm|AArch32}}'' (covering the {{arm|A32}} and {{arm|T32}} ISAs). Foundationally, ARMv8 extends the old architecture while maintaining compatibility with older revisions and extensions (e.g., {{arm|Thumb}}, {{arm|NEON}}, {{arm|VFP}}) when in AArch32. Additionally, ARMv8 introduced a number of enhancements to AArch32 which still maintains full compatibility with {{\\|ARMv7}}. Generally speaking, ARMv8 was designed such that a well-designed AArch64 [[phsyical core|core]] should also work well as an AArch32 core. | ||
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=== AArch64 === | === AArch64 === | ||
{{main|arm/aarch64|l1=AArch64}} | {{main|arm/aarch64|l1=AArch64}} | ||
| − | ARMv8 introduced the new {{\\|AArch64}} execution state that operates on a new instruction set called the {{\\|A64}}. This mode reworked the exception handling model in ARM, making it simpler with fewer modes and banked registers. With 64-bit support, up to 48 bits of virtual address was introduced (note that it's actually an extension of the {{arm|LPAE|Large Physical Address Extension}} which was introduced in {{\\|ARMv7}} but was developed concurrently with the ARMv8). Additionally, both security ({{arm|TrustZone}}) and virtualization carries over to AArch64. | + | ARMv8 introduced the new {{\\|AArch64}} execution state that operates on a new instruction set called the {{\\|A64}}. This mode reworked the exception handling model in ARM, making it simpler with fewer modes and banked registers. With 64-bit support, up to 48 bits of virtual address was introduced (note that it's actually an extension of the {{arm|LPAE|Large Physical Address Extension}} which was introduced in {{\\|ARMv7}} but was developed concurrently with the ARMv8). Additionally, both security ({{arm|TrustZone}}) and virtualization carries over to AArch64. |
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== Profiles == | == Profiles == | ||
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| Microcontroller || ARMv8-M || Optimized for embedded systems with a highly deterministic operation. | | Microcontroller || ARMv8-M || Optimized for embedded systems with a highly deterministic operation. | ||
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* Richard Grisenthwaite. (October 26, 2011). ''"Technology Preview: The ARM Architecture - a View of the Future "''. | * Richard Grisenthwaite. (October 26, 2011). ''"Technology Preview: The ARM Architecture - a View of the Future "''. | ||
* ARM Architecture Group. "Armv8 instruction set overview." vol. PRD03-GENC-010197 (2011). | * ARM Architecture Group. "Armv8 instruction set overview." vol. PRD03-GENC-010197 (2011). | ||
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