SlideShare a Scribd company logo
1 of 47
Download to read offline
Knowing your ARM from your
ARSE
(or, how to iden fy the CPU features in your phone)
Embedded Recipes, Paris
Will Deacon <will@kernel.org>
September, 2019
© 2019 Arm Limited
Disclaimer/excuses:
I no longer work at Arm!
Arm are sponsoring this conference and have kindly paid for my travel to be here.
I usually give fairly deep, low-level technical presenta ons, so this is a change for me.
Feel free to stop/interrupt me during the talk.
This presenta on is based on work done at Arm and is not part of my current employment
2 © 2019 Arm Limited
Introduc on
Linux kernel co-maintainer of arm64 architecture,
ARM perf backends, SMMU drivers, atomics, locking,
memory model, TLB invalida on…
Worked for a decade in the Open-Source So ware
group at Arm
Contributed significantly to the Armv8 architecture
Heavy exposure to the development of the Arm
ecosystem
Tend to be CPU centric
Lots of insider knowledge required to overcome hurdles and
develop successful system so ware for Arm…
3 © 2019 Arm Limited
Spot the difference
4 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
5 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’
5 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’
Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A…
5 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’
Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A…
…but usually people just say ARMv7
5 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’
Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A…
…but usually people just say ARMv7
For example, the Cortex-A7, or A7, which implements ‘Thumb-2’
5 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’
Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A…
…but usually people just say ARMv7
For example, the Cortex-A7, or A7, which implements ‘Thumb-2’
Not be confused with the ‘Apple A7’, which is 64-bit according to wikipedia
5 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’
Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A…
…but usually people just say ARMv7
For example, the Cortex-A7, or A7, which implements ‘Thumb-2’
Not be confused with the ‘Apple A7’, which is 64-bit according to wikipedia
Cortex-A7 also implements virtualisa on and SMP, unlike the Cortex-A8 which came out
years before
5 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’
Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A…
…but usually people just say ARMv7
For example, the Cortex-A7, or A7, which implements ‘Thumb-2’
Not be confused with the ‘Apple A7’, which is 64-bit according to wikipedia
Cortex-A7 also implements virtualisa on and SMP, unlike the Cortex-A8 which came out
years before
Recently, the Cortex-A77 was announced, which implements Armv8 and is 64-bit
5 © 2019 Arm Limited
Everything is fine
ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago)
The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’
Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A…
…but usually people just say ARMv7
For example, the Cortex-A7, or A7, which implements ‘Thumb-2’
Not be confused with the ‘Apple A7’, which is 64-bit according to wikipedia
Cortex-A7 also implements virtualisa on and SMP, unlike the Cortex-A8 which came out
years before
Recently, the Cortex-A77 was announced, which implements Armv8 and is 64-bit
Although the Cortex-A32 also implements Armv8 but is 32-bit only
5 © 2019 Arm Limited
Even Pinhead is confused (July, 2012)
“They have separate versions for their ‘architecture’ (ex: arm v8) and for their
‘implementa on’ (ex: ARM11), and maybe it all makes sense if you have drunk
the ARM cool-aid and have joined the ARM cult, but to sane people and
outsiders, it is just a f*cking mess.”
“Christ. Seriously. The insanity is so strong in the ARM version names that it burns. If it really makes
sense to anybody that ‘ARM A9’ (technically ‘Cortex-A9’, but nobody seems to use the ‘Cortex’ part
at least in cellphones) is an ‘ARM-v7’ architecture microprocessor which is *completely* different
from the ARM9 family, which in turn is different from ARMv9 that hasn’t happened yet, you need to
have your head examined.”
6 © 2019 Arm Limited
Even Pinhead is confused (July, 2012)
“They have separate versions for their ‘architecture’ (ex: arm v8) and for their
‘implementa on’ (ex: ARM11), and maybe it all makes sense if you have drunk
the ARM cool-aid and have joined the ARM cult, but to sane people and
outsiders, it is just a f*cking mess.”
“Christ. Seriously. The insanity is so strong in the ARM version names that it burns. If it really makes
sense to anybody that ‘ARM A9’ (technically ‘Cortex-A9’, but nobody seems to use the ‘Cortex’ part
at least in cellphones) is an ‘ARM-v7’ architecture microprocessor which is *completely* different
from the ARM9 family, which in turn is different from ARMv9 that hasn’t happened yet, you need to
have your head examined.”
So let’s drink the ‘ARM cool-aid’ and figure out what’s going on…
6 © 2019 Arm Limited
Documenta on: off to a good start
Everything you need to know is described in a handy book!
Hilariously called the ‘Arm ARM’ (miraculously, you can search for this)
Almost 8000 pages long
Sporadic releases; usually not quite up-to-date (arch changes weekly)
Acts as a reference, not as a learning resource. Deliberately avoids CPU details.
Did you know?
7 © 2019 Arm Limited
Documenta on: off to a good start
Everything you need to know is described in a handy book!
Hilariously called the ‘Arm ARM’ (miraculously, you can search for this)
Almost 8000 pages long
Sporadic releases; usually not quite up-to-date (arch changes weekly)
Acts as a reference, not as a learning resource. Deliberately avoids CPU details.
Did you know? If you printed a copy for every shipped CPU, it would reach Mars and back 500x!
7 © 2019 Arm Limited
The Arm ARM: Maybe not so handy a er all?
“Any interrupt that is pending before a Context synchroniza on event in the following list, is taken
before the first instruc on a er the context synchronizing event, provided that the pending
interrupt is not masked:
Execu on of an ISB instruc on.
Excep on entry, if ARMv8.5-CSEH is not implemented, or if ARMv8.5-CSEH is implemented and
the appropriate SCTLR_ELx.EIS bit is set.
Excep on return, if ARMv8.5-CSEH is not implemented or if ARMv8.5-CSEH is implemented and
the appropriate SCTLR_ELx.EOS bit is set.
Exit from Debug state.”
8 © 2019 Arm Limited
The Arm ARM: Maybe not so handy a er all?
“Any interrupt that is pending before a Context synchroniza on event in the following list, is taken
before the first instruc on a er the context synchronizing event, provided that the pending
interrupt is not masked:
Execu on of an ISB instruc on.
Excep on entry, if ARMv8.5-CSEH is not implemented, or if ARMv8.5-CSEH is implemented and
the appropriate SCTLR_ELx.EIS bit is set.
Excep on return, if ARMv8.5-CSEH is not implemented or if ARMv8.5-CSEH is implemented and
the appropriate SCTLR_ELx.EOS bit is set.
Exit from Debug state.”
This is not the ‘cool-aid’ you are looking for.
Hurdle 1: Arm is mostly inaccessible to developers on the outside.
8 © 2019 Arm Limited
Important terminology
Architecture vs micro-architecture
Core license vs architecture license
Diversity vs fragmenta on
CPU vs SoC
ISA vs system architecture
Understanding these differences is crucial to picking apart and understanding the Arm ecosystem.
9 © 2019 Arm Limited
Architecture vs Micro-architecture
Architecture is the contract between hardware and
so ware. It describes the portable guarantees provided by
the hardware, without dicta ng how they are implemented,
and is typically specified in English. Arm has three
architecture profiles: A, R and M (more hilarity). Approx.
5yr lag.
Micro-architecture relates to the design of a specific piece
of hardware, and is typically specified in a hardware
descrip on language such as Verilog.
10 © 2019 Arm Limited
Architecture vs Micro-architecture
Architecture is the contract between hardware and
so ware. It describes the portable guarantees provided by
the hardware, without dicta ng how they are implemented,
and is typically specified in English. Arm has three
architecture profiles: A, R and M (more hilarity). Approx.
5yr lag.
Micro-architecture relates to the design of a specific piece
of hardware, and is typically specified in a hardware
descrip on language such as Verilog.
So ware analogy: The C language standard is the architecture, whereas the toolchain source code
(e.g. GCC + GLIBC) is the micro-architecture.
Arm develop both architectures and micro-architectures as licensable products!
10 © 2019 Arm Limited
Architecture vs Micro-architecture
Architecture is the contract between hardware and
so ware. It describes the portable guarantees provided by
the hardware, without dicta ng how they are implemented,
and is typically specified in English. Arm has three
architecture profiles: A, R and M (more hilarity). Approx.
5yr lag.
Micro-architecture relates to the design of a specific piece
of hardware, and is typically specified in a hardware
descrip on language such as Verilog.
So ware analogy: The C language standard is the architecture, whereas the toolchain source code
(e.g. GCC + GLIBC) is the micro-architecture.
Arm develop both architectures and micro-architectures as licensable products!
Hurdle 2: This dis nc on is far less significant on other architectures such as x86.
10 © 2019 Arm Limited
Hysterical raisins
<=ARMv4 When dinosaurs roamed the Earth
ARMv5 2000, Baseline, Xscale
ARMv6 2002, SMP (sort of), ARM11
ARMv7-A 2005, Virtualisa on, VMSA architecture, Cortex-A8
Armv8-A 2011, 64-bit ISA (AArch64), Cortex-A53
Armv8.1-A 2014, LSE atomics, Cavium ThunderX
Armv8.2-A 2015, RAS extensions, Cortex-A77
Armv8.3-A 2016, Pointer authen ca on, Vortex?
Armv8.4-A 2017, MPAM
Armv8.5-A 2018, MTE
11 © 2019 Arm Limited
Hysterical raisins
<=ARMv4 When dinosaurs roamed the Earth
ARMv5 2000, Baseline, Xscale
ARMv6 2002, SMP (sort of), ARM11
ARMv7-A 2005, Virtualisa on, VMSA architecture, Cortex-A8
Armv8-A 2011, 64-bit ISA (AArch64), Cortex-A53
Armv8.1-A 2014, LSE atomics, Cavium ThunderX
Armv8.2-A 2015, RAS extensions, Cortex-A77
Armv8.3-A 2016, Pointer authen ca on, Vortex?
Armv8.4-A 2017, MPAM
Armv8.5-A 2018, MTE
Hurdle 3: Many features op onal! Discoverable at run me using ID registers.
11 © 2019 Arm Limited
Licensing
Why is the product naming so inconsistent? Partly due to the licensing model:
Core license to include a specific Arm CPU design in your SoC. Minor modifica on may be
permi ed.
Architecture license to design your own CPU from scratch which implements the Arm architecture
and allow your marke ng team to call it whatever they like
This means that Arm’s architecture partners are also indirect compe tors!
12 © 2019 Arm Limited
Licensing
Why is the product naming so inconsistent? Partly due to the licensing model:
Core license to include a specific Arm CPU design in your SoC. Minor modifica on may be
permi ed.
Architecture license to design your own CPU from scratch which implements the Arm architecture
and allow your marke ng team to call it whatever they like
This means that Arm’s architecture partners are also indirect compe tors!
Hurdle 4: Important that Arm doesn’t produce produc on silicon as an SoC
12 © 2019 Arm Limited
The Arm ecosystem
13 © 2019 Arm Limited
Playing ‘Switzerland’
Arm’s influence is in the power of the partnership and underlying pla orm; on its own, it’s rela vely
ny in revenue terms:
Qualcomm 22B USD (2018)
Intel 70B USD (2018)
Samsung 211B USD (2017)
14 © 2019 Arm Limited
Playing ‘Switzerland’
Arm’s influence is in the power of the partnership and underlying pla orm; on its own, it’s rela vely
ny in revenue terms:
Qualcomm 22B USD (2018)
Intel 70B USD (2018)
Samsung 211B USD (2017)
Arm <1B GBP (2015)
Greater than the sum of its parts, but driven by consensus.
14 © 2019 Arm Limited
Playing ‘Switzerland’
Arm’s influence is in the power of the partnership and underlying pla orm; on its own, it’s rela vely
ny in revenue terms:
Qualcomm 22B USD (2018)
Intel 70B USD (2018)
Samsung 211B USD (2017)
Arm <1B GBP (2015)
Greater than the sum of its parts, but driven by consensus.
Hurdle 5: Limited ability to mandate standards compliance or move goalposts
14 © 2019 Arm Limited
Diversity vs Fragmenta on
‘Pick ‘n’ mix’ architecture reigned in slightly by desire for so ware re-use:
PSCI to bring CPUs up and down
SBSA cer fica on for server system designs
Trusted firmware open-source boiler-plate
Linux/KVM upstream-first approach
15 © 2019 Arm Limited
Diversity vs Fragmenta on
‘Pick ‘n’ mix’ architecture reigned in slightly by desire for so ware re-use:
PSCI to bring CPUs up and down
SBSA cer fica on for server system designs
Trusted firmware open-source boiler-plate
Linux/KVM upstream-first approach
Hurdle 6: S ll a tendancy towards fragmenta on between SoCs
https://www.mono-project.com/news/2016/09/12/arm64-icache/
15 © 2019 Arm Limited
How does Linux cope?
The arm64 Linux kernel is wri en to the architecture and aims to abstract away the underlying bag
of bits baked into silicon:
Single defconfig binary image for all AArch64 CPUs
Heavy use of ‘alterna ve’ instruc on patching
uarch-specific features not worth the effort…
…apart from errata workarounds and side-channels
Heterogeneous systems are a headache
Exposed to userspace via proc, sys, ELF HWCAP
and MRS instruc ons
Details in Documentation/arm64/cpu-feature-registers.rst
Email the list if you need more: linux-arm-kernel@lists.infradead.org
16 © 2019 Arm Limited
Fire up the simula on
17 © 2019 Arm Limited
Where do I start? / What’s in the box?
1. Ignore all the marke ng junk
2. Iden fy the SoC
3. Iden fy the CPU(s) – Arm derived?
4. Iden fy architecture version
5. Iden fy features
6. https://wikichip.org
18 © 2019 Arm Limited
Some example devices
19 © 2019 Arm Limited
Example 1: Libre Computer ‘La Frite’
They say…
AML-S805X-AC is the perfect development pla orm for projects that require highly performant ARM
Cortex-A class CPUs, small compact form factor, secure and non-secure 1080P media delivery and
playback, high reliability, and low power.
20 © 2019 Arm Limited
Example 1: Libre Computer ‘La Frite’
They say…
AML-S805X-AC is the perfect development pla orm for projects that require highly performant ARM
Cortex-A class CPUs, small compact form factor, secure and non-secure 1080P media delivery and
playback, high reliability, and low power.
Soc is Amlogic S805x
4x ARM Cortex-A53 @ 1.2GHz
Cortex-A53 is a 64-bit core implemen ng ARMv8.0
Usually the ‘Li le’ in early ‘big.Li le’ designs
ARM says…
The most widely-used processor with balanced performance and efficiency
20 © 2019 Arm Limited
Example 2: Samsung Galaxy S9
They say…
10nm 64-bit Octa-Core Processor 2.8GHz + 1.7GHz (Maximum Clock Speed, Performance Core +
Efficiency Core)
21 © 2019 Arm Limited
Example 2: Samsung Galaxy S9
They say…
10nm 64-bit Octa-Core Processor 2.8GHz + 1.7GHz (Maximum Clock Speed, Performance Core +
Efficiency Core)
SoC appears to be Samsung Exynos 9810 (in Europe)
Wikichip claims this features 4xMongoose 3 plus 4xCortex-A55 cores
Cortex-A55 designed by Arm and implements ARMv8.2
Mongoose 3 designed by Samsung and implements ARMv8.0
21 © 2019 Arm Limited
Example 2: Samsung Galaxy S9
They say…
10nm 64-bit Octa-Core Processor 2.8GHz + 1.7GHz (Maximum Clock Speed, Performance Core +
Efficiency Core)
SoC appears to be Samsung Exynos 9810 (in Europe)
Wikichip claims this features 4xMongoose 3 plus 4xCortex-A55 cores
Cortex-A55 designed by Arm and implements ARMv8.2
Mongoose 3 designed by Samsung and implements ARMv8.0
The Cortex-A55 implements more instruc ons than the Mongoose 3!
https://medium.com/@jadr2ddude/
a-big-little-problem-a-tale-of-big-little-gone-wrong-e7778ce744bb
21 © 2019 Arm Limited
Example 3: Motorola moto z4
They say…
Feel the speed of a Qualcomm® Snapdragon™ 675 processor that’s 57% faster than moto z3 play. It’s
a phone built to keep up with you.
22 © 2019 Arm Limited
Example 3: Motorola moto z4
They say…
Feel the speed of a Qualcomm® Snapdragon™ 675 processor that’s 57% faster than moto z3 play. It’s
a phone built to keep up with you.
It’s an SoC not a bloody processor!
Qualcomm say…
CPU Cores: Qualcomm® Kryo™ 460 CPU, Octa-core CPU…built on Arm Cortex technology…
22 © 2019 Arm Limited
Example 3: Motorola moto z4
They say…
Feel the speed of a Qualcomm® Snapdragon™ 675 processor that’s 57% faster than moto z3 play. It’s
a phone built to keep up with you.
It’s an SoC not a bloody processor!
Qualcomm say…
CPU Cores: Qualcomm® Kryo™ 460 CPU, Octa-core CPU…built on Arm Cortex technology…
Wikichip to the rescue!
Kryo 460 Silver => Cortex-A55
Kryo 460 Gold => Cortex-A76
Both implement ARMv8.2
‘The two big disclosed changes are an increase of the core’s reorder buffer from 128 entries to a
higher, unspecified amount, as well as tuning the prefetchers to be er work with floa ng point
workloads.’ https://www.anandtech.com/show/14072/the-samsung-galaxy-s10plus-review/3
22 © 2019 Arm Limited
Ques ons?
Please contact support@arm.com!
The Arm trademarks featured in this presenta on are registered trademarks or
trademarks of Arm Limited (or its subsidiaries) in the US and/or elsewhere. All rights
reserved. All other marks featured may be trademarks of their respec ve owners.
www.arm.com/company/policies/trademarks
© 2019 Arm Limited
Image references
1. Colin Davis, ‘Veins in my Right Arm’. Cropped from https://live.staticflickr.com/3382/3554305017_053fee6793_b_d.jpg - CC BY 2.0
(https://creativecommons.org/licenses/by/2.0/)
2. Marco Verch, ‘Bauarbeiterdekoltee’. Unmodified from https://live.staticflickr.com/4357/36221532814_779c61e968_k_d.jpg - CC BY 2.0
(https://creativecommons.org/licenses/by/2.0/)
3. DJRphoto36, ‘Angry Penguin’. Unmodified from https://live.staticflickr.com/5056/5496520090_e9aa83dc0b_b_d.jpg - CC BY 2.0
(https://creativecommons.org/licenses/by/2.0/)
4. Kevin Gill, ‘Mars’. Unmodified from https://live.staticflickr.com/2107/32789125872_f0184cc247_k_d.jpg - CC BY 2.0
(https://creativecommons.org/licenses/by/2.0/)
5. Pablo Cabezos, ‘King College´s chapel (Cambridge)’. Unmodified from https://live.staticflickr.com/8300/29112354294_3c0f166ec1_b_d.jpg - CC BY 2.0
(https://creativecommons.org/licenses/by/2.0/)
6. kecia85, ‘Dic onary-007’. Unmodified from https://live.staticflickr.com/8322/7983928912_f18c81fb31_o_d.jpg - CC BY-SA 2.0
(https://creativecommons.org/licenses/by-sa/2.0/)
7. Images Money, ‘Money’. Unmodified from https://live.staticflickr.com/6029/5929622407_e474db378d_k_d.jpg - CC BY 2.0
(https://creativecommons.org/licenses/by/2.0/)
8. wisegie, ‘Swiss flag’. Unmodified from https://live.staticflickr.com/6082/6078034891_ca23bb39a8_b_d.jpg - CC BY 2.0
(https://creativecommons.org/licenses/by/2.0/)
9. The DLC, ‘Buffet line’. Cropped from https://live.staticflickr.com/1369/4734507240_57b0244541_h_d.jpg - CC BY-SA 2.0
(https://creativecommons.org/licenses/by-sa/2.0/)
10. lewing@isc.tamu.edu Larry Ewing and The GIMP, ‘Tux penguin’. Unmodified from https://commons.wikimedia.org/wiki/File:Tux.png
11. Cur s Alan Jackson, ‘A er this, I give up. Probably.’. Unmodified from https://live.staticflickr.com/5097/5418579238_d28022927c_h_d.jpg - CC BY 2.0
(https://creativecommons.org/licenses/by/2.0/)
24 © 2019 Arm Limited

More Related Content

What's hot

Hardware accelerated virtio networking for nfv linux con
Hardware accelerated virtio networking for nfv linux conHardware accelerated virtio networking for nfv linux con
Hardware accelerated virtio networking for nfv linux consprdd
 
First Steps Developing Embedded Applications using Heterogeneous Multi-core P...
First Steps Developing Embedded Applications using Heterogeneous Multi-core P...First Steps Developing Embedded Applications using Heterogeneous Multi-core P...
First Steps Developing Embedded Applications using Heterogeneous Multi-core P...Toradex
 
Static partitioning virtualization on RISC-V
Static partitioning virtualization on RISC-VStatic partitioning virtualization on RISC-V
Static partitioning virtualization on RISC-VRISC-V International
 
Embedded Recipes 2019 - Remote update adventures with RAUC, Yocto and Barebox
Embedded Recipes 2019 - Remote update adventures with RAUC, Yocto and BareboxEmbedded Recipes 2019 - Remote update adventures with RAUC, Yocto and Barebox
Embedded Recipes 2019 - Remote update adventures with RAUC, Yocto and BareboxAnne Nicolas
 
Video Gateway Installation and configuration
Video Gateway Installation and configurationVideo Gateway Installation and configuration
Video Gateway Installation and configurationsreeharsha43
 
Porting a new architecture (NDS32) to open wrt project
Porting a new architecture (NDS32) to open wrt projectPorting a new architecture (NDS32) to open wrt project
Porting a new architecture (NDS32) to open wrt projectMacpaul Lin
 
HTTP and 5G (fixed1)
HTTP and 5G (fixed1)HTTP and 5G (fixed1)
HTTP and 5G (fixed1)dynamis
 
Devconf2017 - Can VMs networking benefit from DPDK
Devconf2017 - Can VMs networking benefit from DPDKDevconf2017 - Can VMs networking benefit from DPDK
Devconf2017 - Can VMs networking benefit from DPDKMaxime Coquelin
 
Cisco usNIC: how it works, how it is used in Open MPI
Cisco usNIC: how it works, how it is used in Open MPICisco usNIC: how it works, how it is used in Open MPI
Cisco usNIC: how it works, how it is used in Open MPIJeff Squyres
 
Intel® Ethernet Update
Intel® Ethernet Update Intel® Ethernet Update
Intel® Ethernet Update Michelle Holley
 
PCI Passthrough and ITS Support in Xen / ARM :Xen Dev Summit 2015 Presentation
PCI Passthrough and ITS Support in Xen / ARM :Xen Dev Summit 2015 Presentation PCI Passthrough and ITS Support in Xen / ARM :Xen Dev Summit 2015 Presentation
PCI Passthrough and ITS Support in Xen / ARM :Xen Dev Summit 2015 Presentation Manish Jaggi
 
FlexVPNLabHandbook-SAMPLE
FlexVPNLabHandbook-SAMPLEFlexVPNLabHandbook-SAMPLE
FlexVPNLabHandbook-SAMPLETariq Sheikh
 
Cisco IOS XRv Router Installation and Configuration Guide
Cisco IOS XRv Router Installation and Configuration GuideCisco IOS XRv Router Installation and Configuration Guide
Cisco IOS XRv Router Installation and Configuration GuideSalachudin Emir
 
Turtlebot3: VxWorks running ROS2 as a real-time guest OS on Hypervisor
Turtlebot3: VxWorks running ROS2 as a real-time guest OS on HypervisorTurtlebot3: VxWorks running ROS2 as a real-time guest OS on Hypervisor
Turtlebot3: VxWorks running ROS2 as a real-time guest OS on HypervisorAndrei Kholodnyi
 
Project ACRN GPIO mediator introduction
Project ACRN GPIO mediator introductionProject ACRN GPIO mediator introduction
Project ACRN GPIO mediator introductionProject ACRN
 
Ott Streaming Protocols and DRM
Ott Streaming Protocols and DRMOtt Streaming Protocols and DRM
Ott Streaming Protocols and DRMASIMYILDIZ
 

What's hot (20)

Hardware accelerated virtio networking for nfv linux con
Hardware accelerated virtio networking for nfv linux conHardware accelerated virtio networking for nfv linux con
Hardware accelerated virtio networking for nfv linux con
 
First Steps Developing Embedded Applications using Heterogeneous Multi-core P...
First Steps Developing Embedded Applications using Heterogeneous Multi-core P...First Steps Developing Embedded Applications using Heterogeneous Multi-core P...
First Steps Developing Embedded Applications using Heterogeneous Multi-core P...
 
Static partitioning virtualization on RISC-V
Static partitioning virtualization on RISC-VStatic partitioning virtualization on RISC-V
Static partitioning virtualization on RISC-V
 
virtio
virtiovirtio
virtio
 
Andes RISC-V processor solutions
Andes RISC-V processor solutionsAndes RISC-V processor solutions
Andes RISC-V processor solutions
 
Embedded Recipes 2019 - Remote update adventures with RAUC, Yocto and Barebox
Embedded Recipes 2019 - Remote update adventures with RAUC, Yocto and BareboxEmbedded Recipes 2019 - Remote update adventures with RAUC, Yocto and Barebox
Embedded Recipes 2019 - Remote update adventures with RAUC, Yocto and Barebox
 
Video Gateway Installation and configuration
Video Gateway Installation and configurationVideo Gateway Installation and configuration
Video Gateway Installation and configuration
 
Porting a new architecture (NDS32) to open wrt project
Porting a new architecture (NDS32) to open wrt projectPorting a new architecture (NDS32) to open wrt project
Porting a new architecture (NDS32) to open wrt project
 
HTTP and 5G (fixed1)
HTTP and 5G (fixed1)HTTP and 5G (fixed1)
HTTP and 5G (fixed1)
 
Devconf2017 - Can VMs networking benefit from DPDK
Devconf2017 - Can VMs networking benefit from DPDKDevconf2017 - Can VMs networking benefit from DPDK
Devconf2017 - Can VMs networking benefit from DPDK
 
Cisco usNIC: how it works, how it is used in Open MPI
Cisco usNIC: how it works, how it is used in Open MPICisco usNIC: how it works, how it is used in Open MPI
Cisco usNIC: how it works, how it is used in Open MPI
 
Intel® Ethernet Update
Intel® Ethernet Update Intel® Ethernet Update
Intel® Ethernet Update
 
PCI Passthrough and ITS Support in Xen / ARM :Xen Dev Summit 2015 Presentation
PCI Passthrough and ITS Support in Xen / ARM :Xen Dev Summit 2015 Presentation PCI Passthrough and ITS Support in Xen / ARM :Xen Dev Summit 2015 Presentation
PCI Passthrough and ITS Support in Xen / ARM :Xen Dev Summit 2015 Presentation
 
Anycast all the things
Anycast all the thingsAnycast all the things
Anycast all the things
 
FlexVPNLabHandbook-SAMPLE
FlexVPNLabHandbook-SAMPLEFlexVPNLabHandbook-SAMPLE
FlexVPNLabHandbook-SAMPLE
 
Cisco IOS XRv Router Installation and Configuration Guide
Cisco IOS XRv Router Installation and Configuration GuideCisco IOS XRv Router Installation and Configuration Guide
Cisco IOS XRv Router Installation and Configuration Guide
 
Using Qt under LGPLv3
Using Qt under LGPLv3Using Qt under LGPLv3
Using Qt under LGPLv3
 
Turtlebot3: VxWorks running ROS2 as a real-time guest OS on Hypervisor
Turtlebot3: VxWorks running ROS2 as a real-time guest OS on HypervisorTurtlebot3: VxWorks running ROS2 as a real-time guest OS on Hypervisor
Turtlebot3: VxWorks running ROS2 as a real-time guest OS on Hypervisor
 
Project ACRN GPIO mediator introduction
Project ACRN GPIO mediator introductionProject ACRN GPIO mediator introduction
Project ACRN GPIO mediator introduction
 
Ott Streaming Protocols and DRM
Ott Streaming Protocols and DRMOtt Streaming Protocols and DRM
Ott Streaming Protocols and DRM
 

Similar to Embedded Recipes 2019 - Knowing your ARM from your ARSE: wading through the technology terminology of an embedded SoC

LCE12: LCE12 ARMv8 Plenary
LCE12: LCE12 ARMv8 PlenaryLCE12: LCE12 ARMv8 Plenary
LCE12: LCE12 ARMv8 PlenaryLinaro
 
Summit 16: OPNFV on ARM - Hardware Freedom of Choice Has Arrived!
Summit 16: OPNFV on ARM - Hardware Freedom of Choice Has Arrived!Summit 16: OPNFV on ARM - Hardware Freedom of Choice Has Arrived!
Summit 16: OPNFV on ARM - Hardware Freedom of Choice Has Arrived!OPNFV
 
Programming The Arm Microprocessor For Embedded Systems
Programming The Arm Microprocessor For Embedded SystemsProgramming The Arm Microprocessor For Embedded Systems
Programming The Arm Microprocessor For Embedded Systemsajaydudani
 
SNAPDRAGON SoC Family and ARM Architecture
SNAPDRAGON SoC Family and ARM Architecture SNAPDRAGON SoC Family and ARM Architecture
SNAPDRAGON SoC Family and ARM Architecture Abdullaziz Tagawy
 
Arm based controller - basic bootcamp
Arm based controller - basic bootcampArm based controller - basic bootcamp
Arm based controller - basic bootcampRoy Messinger
 
iPhone Architecture - Review
iPhone Architecture - ReviewiPhone Architecture - Review
iPhone Architecture - ReviewAbdelrahman Hosny
 
Developing Applications for Beagle Bone Black, Raspberry Pi and SoC Single Bo...
Developing Applications for Beagle Bone Black, Raspberry Pi and SoC Single Bo...Developing Applications for Beagle Bone Black, Raspberry Pi and SoC Single Bo...
Developing Applications for Beagle Bone Black, Raspberry Pi and SoC Single Bo...ryancox
 
Smartphone processors
Smartphone processorsSmartphone processors
Smartphone processorsMahzad Zahedi
 
BlackHat_DC_2011_Avraham_ARM Exploitation-wp.2.0
BlackHat_DC_2011_Avraham_ARM Exploitation-wp.2.0BlackHat_DC_2011_Avraham_ARM Exploitation-wp.2.0
BlackHat_DC_2011_Avraham_ARM Exploitation-wp.2.0Zuk Avraham
 
Programming The Arm Microprocessor For Embedded Systems
Programming The Arm Microprocessor For Embedded SystemsProgramming The Arm Microprocessor For Embedded Systems
Programming The Arm Microprocessor For Embedded Systemsjoshparrish13
 
Arm processor architecture awareness session pi technologies
Arm processor architecture awareness session pi technologiesArm processor architecture awareness session pi technologies
Arm processor architecture awareness session pi technologiesPiTechnologies
 
Presentation power vm common 2012
Presentation   power vm common 2012Presentation   power vm common 2012
Presentation power vm common 2012solarisyougood
 
LECT 1: ARM PROCESSORS
LECT 1: ARM PROCESSORSLECT 1: ARM PROCESSORS
LECT 1: ARM PROCESSORSDr.YNM
 

Similar to Embedded Recipes 2019 - Knowing your ARM from your ARSE: wading through the technology terminology of an embedded SoC (20)

RDMA on ARM
RDMA on ARMRDMA on ARM
RDMA on ARM
 
ARM Processor Tutorial
ARM Processor Tutorial ARM Processor Tutorial
ARM Processor Tutorial
 
ARM and SoC Traning Part I -- Overview
ARM and SoC Traning Part I -- OverviewARM and SoC Traning Part I -- Overview
ARM and SoC Traning Part I -- Overview
 
LCE12: LCE12 ARMv8 Plenary
LCE12: LCE12 ARMv8 PlenaryLCE12: LCE12 ARMv8 Plenary
LCE12: LCE12 ARMv8 Plenary
 
Summit 16: OPNFV on ARM - Hardware Freedom of Choice Has Arrived!
Summit 16: OPNFV on ARM - Hardware Freedom of Choice Has Arrived!Summit 16: OPNFV on ARM - Hardware Freedom of Choice Has Arrived!
Summit 16: OPNFV on ARM - Hardware Freedom of Choice Has Arrived!
 
Programming The Arm Microprocessor For Embedded Systems
Programming The Arm Microprocessor For Embedded SystemsProgramming The Arm Microprocessor For Embedded Systems
Programming The Arm Microprocessor For Embedded Systems
 
SNAPDRAGON SoC Family and ARM Architecture
SNAPDRAGON SoC Family and ARM Architecture SNAPDRAGON SoC Family and ARM Architecture
SNAPDRAGON SoC Family and ARM Architecture
 
Arm based controller - basic bootcamp
Arm based controller - basic bootcampArm based controller - basic bootcamp
Arm based controller - basic bootcamp
 
iPhone Architecture - Review
iPhone Architecture - ReviewiPhone Architecture - Review
iPhone Architecture - Review
 
Axiom Magazine: Volume 1, Issue 3, October 2013
Axiom Magazine: Volume 1, Issue 3, October 2013Axiom Magazine: Volume 1, Issue 3, October 2013
Axiom Magazine: Volume 1, Issue 3, October 2013
 
Developing Applications for Beagle Bone Black, Raspberry Pi and SoC Single Bo...
Developing Applications for Beagle Bone Black, Raspberry Pi and SoC Single Bo...Developing Applications for Beagle Bone Black, Raspberry Pi and SoC Single Bo...
Developing Applications for Beagle Bone Black, Raspberry Pi and SoC Single Bo...
 
Smartphone processors
Smartphone processorsSmartphone processors
Smartphone processors
 
BlackHat_DC_2011_Avraham_ARM Exploitation-wp.2.0
BlackHat_DC_2011_Avraham_ARM Exploitation-wp.2.0BlackHat_DC_2011_Avraham_ARM Exploitation-wp.2.0
BlackHat_DC_2011_Avraham_ARM Exploitation-wp.2.0
 
Programming The Arm Microprocessor For Embedded Systems
Programming The Arm Microprocessor For Embedded SystemsProgramming The Arm Microprocessor For Embedded Systems
Programming The Arm Microprocessor For Embedded Systems
 
Arm processor architecture awareness session pi technologies
Arm processor architecture awareness session pi technologiesArm processor architecture awareness session pi technologies
Arm processor architecture awareness session pi technologies
 
Presentation power vm common 2012
Presentation   power vm common 2012Presentation   power vm common 2012
Presentation power vm common 2012
 
HPC Network Stack on ARM
HPC Network Stack on ARMHPC Network Stack on ARM
HPC Network Stack on ARM
 
LECT 1: ARM PROCESSORS
LECT 1: ARM PROCESSORSLECT 1: ARM PROCESSORS
LECT 1: ARM PROCESSORS
 
Ppt
PptPpt
Ppt
 
Presentation
PresentationPresentation
Presentation
 

More from Anne Nicolas

Kernel Recipes 2019 - Driving the industry toward upstream first
Kernel Recipes 2019 - Driving the industry toward upstream firstKernel Recipes 2019 - Driving the industry toward upstream first
Kernel Recipes 2019 - Driving the industry toward upstream firstAnne Nicolas
 
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernelKernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernelAnne Nicolas
 
Kernel Recipes 2019 - Metrics are money
Kernel Recipes 2019 - Metrics are moneyKernel Recipes 2019 - Metrics are money
Kernel Recipes 2019 - Metrics are moneyAnne Nicolas
 
Kernel Recipes 2019 - Kernel documentation: past, present, and future
Kernel Recipes 2019 - Kernel documentation: past, present, and futureKernel Recipes 2019 - Kernel documentation: past, present, and future
Kernel Recipes 2019 - Kernel documentation: past, present, and futureAnne Nicolas
 
Kernel Recipes 2019 - GNU poke, an extensible editor for structured binary data
Kernel Recipes 2019 - GNU poke, an extensible editor for structured binary dataKernel Recipes 2019 - GNU poke, an extensible editor for structured binary data
Kernel Recipes 2019 - GNU poke, an extensible editor for structured binary dataAnne Nicolas
 
Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...
Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...
Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...Anne Nicolas
 
Embedded Recipes 2019 - Linux on Open Source Hardware and Libre Silicon
Embedded Recipes 2019 - Linux on Open Source Hardware and Libre SiliconEmbedded Recipes 2019 - Linux on Open Source Hardware and Libre Silicon
Embedded Recipes 2019 - Linux on Open Source Hardware and Libre SiliconAnne Nicolas
 
Embedded Recipes 2019 - Testing firmware the devops way
Embedded Recipes 2019 - Testing firmware the devops wayEmbedded Recipes 2019 - Testing firmware the devops way
Embedded Recipes 2019 - Testing firmware the devops wayAnne Nicolas
 
Embedded Recipes 2019 - Herd your socs become a matchmaker
Embedded Recipes 2019 - Herd your socs become a matchmakerEmbedded Recipes 2019 - Herd your socs become a matchmaker
Embedded Recipes 2019 - Herd your socs become a matchmakerAnne Nicolas
 
Embedded Recipes 2019 - Introduction to JTAG debugging
Embedded Recipes 2019 - Introduction to JTAG debuggingEmbedded Recipes 2019 - Introduction to JTAG debugging
Embedded Recipes 2019 - Introduction to JTAG debuggingAnne Nicolas
 
Embedded Recipes 2019 - Pipewire a new foundation for embedded multimedia
Embedded Recipes 2019 - Pipewire a new foundation for embedded multimediaEmbedded Recipes 2019 - Pipewire a new foundation for embedded multimedia
Embedded Recipes 2019 - Pipewire a new foundation for embedded multimediaAnne Nicolas
 
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all started
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all startedKernel Recipes 2019 - ftrace: Where modifying a running kernel all started
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all startedAnne Nicolas
 
Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)
Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)
Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)Anne Nicolas
 
Kernel Recipes 2019 - Formal modeling made easy
Kernel Recipes 2019 - Formal modeling made easyKernel Recipes 2019 - Formal modeling made easy
Kernel Recipes 2019 - Formal modeling made easyAnne Nicolas
 
Kernel Recipes 2019 - CVEs are dead, long live the CVE!
Kernel Recipes 2019 - CVEs are dead, long live the CVE!Kernel Recipes 2019 - CVEs are dead, long live the CVE!
Kernel Recipes 2019 - CVEs are dead, long live the CVE!Anne Nicolas
 
Kernel Recipes 2019 - XDP closer integration with network stack
Kernel Recipes 2019 -  XDP closer integration with network stackKernel Recipes 2019 -  XDP closer integration with network stack
Kernel Recipes 2019 - XDP closer integration with network stackAnne Nicolas
 
Kernel Recipes 2019 - Kernel hacking behind closed doors
Kernel Recipes 2019 - Kernel hacking behind closed doorsKernel Recipes 2019 - Kernel hacking behind closed doors
Kernel Recipes 2019 - Kernel hacking behind closed doorsAnne Nicolas
 
Kernel Recipes 2019 - Faster IO through io_uring
Kernel Recipes 2019 - Faster IO through io_uringKernel Recipes 2019 - Faster IO through io_uring
Kernel Recipes 2019 - Faster IO through io_uringAnne Nicolas
 
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernelKernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernelAnne Nicolas
 
Kernel Recipes 2019 - pidfds: Process file descriptors on Linux
Kernel Recipes 2019 - pidfds: Process file descriptors on LinuxKernel Recipes 2019 - pidfds: Process file descriptors on Linux
Kernel Recipes 2019 - pidfds: Process file descriptors on LinuxAnne Nicolas
 

More from Anne Nicolas (20)

Kernel Recipes 2019 - Driving the industry toward upstream first
Kernel Recipes 2019 - Driving the industry toward upstream firstKernel Recipes 2019 - Driving the industry toward upstream first
Kernel Recipes 2019 - Driving the industry toward upstream first
 
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernelKernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
 
Kernel Recipes 2019 - Metrics are money
Kernel Recipes 2019 - Metrics are moneyKernel Recipes 2019 - Metrics are money
Kernel Recipes 2019 - Metrics are money
 
Kernel Recipes 2019 - Kernel documentation: past, present, and future
Kernel Recipes 2019 - Kernel documentation: past, present, and futureKernel Recipes 2019 - Kernel documentation: past, present, and future
Kernel Recipes 2019 - Kernel documentation: past, present, and future
 
Kernel Recipes 2019 - GNU poke, an extensible editor for structured binary data
Kernel Recipes 2019 - GNU poke, an extensible editor for structured binary dataKernel Recipes 2019 - GNU poke, an extensible editor for structured binary data
Kernel Recipes 2019 - GNU poke, an extensible editor for structured binary data
 
Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...
Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...
Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...
 
Embedded Recipes 2019 - Linux on Open Source Hardware and Libre Silicon
Embedded Recipes 2019 - Linux on Open Source Hardware and Libre SiliconEmbedded Recipes 2019 - Linux on Open Source Hardware and Libre Silicon
Embedded Recipes 2019 - Linux on Open Source Hardware and Libre Silicon
 
Embedded Recipes 2019 - Testing firmware the devops way
Embedded Recipes 2019 - Testing firmware the devops wayEmbedded Recipes 2019 - Testing firmware the devops way
Embedded Recipes 2019 - Testing firmware the devops way
 
Embedded Recipes 2019 - Herd your socs become a matchmaker
Embedded Recipes 2019 - Herd your socs become a matchmakerEmbedded Recipes 2019 - Herd your socs become a matchmaker
Embedded Recipes 2019 - Herd your socs become a matchmaker
 
Embedded Recipes 2019 - Introduction to JTAG debugging
Embedded Recipes 2019 - Introduction to JTAG debuggingEmbedded Recipes 2019 - Introduction to JTAG debugging
Embedded Recipes 2019 - Introduction to JTAG debugging
 
Embedded Recipes 2019 - Pipewire a new foundation for embedded multimedia
Embedded Recipes 2019 - Pipewire a new foundation for embedded multimediaEmbedded Recipes 2019 - Pipewire a new foundation for embedded multimedia
Embedded Recipes 2019 - Pipewire a new foundation for embedded multimedia
 
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all started
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all startedKernel Recipes 2019 - ftrace: Where modifying a running kernel all started
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all started
 
Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)
Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)
Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)
 
Kernel Recipes 2019 - Formal modeling made easy
Kernel Recipes 2019 - Formal modeling made easyKernel Recipes 2019 - Formal modeling made easy
Kernel Recipes 2019 - Formal modeling made easy
 
Kernel Recipes 2019 - CVEs are dead, long live the CVE!
Kernel Recipes 2019 - CVEs are dead, long live the CVE!Kernel Recipes 2019 - CVEs are dead, long live the CVE!
Kernel Recipes 2019 - CVEs are dead, long live the CVE!
 
Kernel Recipes 2019 - XDP closer integration with network stack
Kernel Recipes 2019 -  XDP closer integration with network stackKernel Recipes 2019 -  XDP closer integration with network stack
Kernel Recipes 2019 - XDP closer integration with network stack
 
Kernel Recipes 2019 - Kernel hacking behind closed doors
Kernel Recipes 2019 - Kernel hacking behind closed doorsKernel Recipes 2019 - Kernel hacking behind closed doors
Kernel Recipes 2019 - Kernel hacking behind closed doors
 
Kernel Recipes 2019 - Faster IO through io_uring
Kernel Recipes 2019 - Faster IO through io_uringKernel Recipes 2019 - Faster IO through io_uring
Kernel Recipes 2019 - Faster IO through io_uring
 
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernelKernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
 
Kernel Recipes 2019 - pidfds: Process file descriptors on Linux
Kernel Recipes 2019 - pidfds: Process file descriptors on LinuxKernel Recipes 2019 - pidfds: Process file descriptors on Linux
Kernel Recipes 2019 - pidfds: Process file descriptors on Linux
 

Recently uploaded

Sending Calendar Invites on SES and Calendarsnack.pdf
Sending Calendar Invites on SES and Calendarsnack.pdfSending Calendar Invites on SES and Calendarsnack.pdf
Sending Calendar Invites on SES and Calendarsnack.pdf31events.com
 
Innovate and Collaborate- Harnessing the Power of Open Source Software.pdf
Innovate and Collaborate- Harnessing the Power of Open Source Software.pdfInnovate and Collaborate- Harnessing the Power of Open Source Software.pdf
Innovate and Collaborate- Harnessing the Power of Open Source Software.pdfYashikaSharma391629
 
Patterns for automating API delivery. API conference
Patterns for automating API delivery. API conferencePatterns for automating API delivery. API conference
Patterns for automating API delivery. API conferencessuser9e7c64
 
SensoDat: Simulation-based Sensor Dataset of Self-driving Cars
SensoDat: Simulation-based Sensor Dataset of Self-driving CarsSensoDat: Simulation-based Sensor Dataset of Self-driving Cars
SensoDat: Simulation-based Sensor Dataset of Self-driving CarsChristian Birchler
 
Open Source Summit NA 2024: Open Source Cloud Costs - OpenCost's Impact on En...
Open Source Summit NA 2024: Open Source Cloud Costs - OpenCost's Impact on En...Open Source Summit NA 2024: Open Source Cloud Costs - OpenCost's Impact on En...
Open Source Summit NA 2024: Open Source Cloud Costs - OpenCost's Impact on En...Matt Ray
 
How to submit a standout Adobe Champion Application
How to submit a standout Adobe Champion ApplicationHow to submit a standout Adobe Champion Application
How to submit a standout Adobe Champion ApplicationBradBedford3
 
Cyber security and its impact on E commerce
Cyber security and its impact on E commerceCyber security and its impact on E commerce
Cyber security and its impact on E commercemanigoyal112
 
UI5ers live - Custom Controls wrapping 3rd-party libs.pptx
UI5ers live - Custom Controls wrapping 3rd-party libs.pptxUI5ers live - Custom Controls wrapping 3rd-party libs.pptx
UI5ers live - Custom Controls wrapping 3rd-party libs.pptxAndreas Kunz
 
Global Identity Enrolment and Verification Pro Solution - Cizo Technology Ser...
Global Identity Enrolment and Verification Pro Solution - Cizo Technology Ser...Global Identity Enrolment and Verification Pro Solution - Cizo Technology Ser...
Global Identity Enrolment and Verification Pro Solution - Cizo Technology Ser...Cizo Technology Services
 
Powering Real-Time Decisions with Continuous Data Streams
Powering Real-Time Decisions with Continuous Data StreamsPowering Real-Time Decisions with Continuous Data Streams
Powering Real-Time Decisions with Continuous Data StreamsSafe Software
 
Odoo 14 - eLearning Module In Odoo 14 Enterprise
Odoo 14 - eLearning Module In Odoo 14 EnterpriseOdoo 14 - eLearning Module In Odoo 14 Enterprise
Odoo 14 - eLearning Module In Odoo 14 Enterprisepreethippts
 
Lecture # 8 software design and architecture (SDA).ppt
Lecture # 8 software design and architecture (SDA).pptLecture # 8 software design and architecture (SDA).ppt
Lecture # 8 software design and architecture (SDA).pptesrabilgic2
 
20240415 [Container Plumbing Days] Usernetes Gen2 - Kubernetes in Rootless Do...
20240415 [Container Plumbing Days] Usernetes Gen2 - Kubernetes in Rootless Do...20240415 [Container Plumbing Days] Usernetes Gen2 - Kubernetes in Rootless Do...
20240415 [Container Plumbing Days] Usernetes Gen2 - Kubernetes in Rootless Do...Akihiro Suda
 
CRM Contender Series: HubSpot vs. Salesforce
CRM Contender Series: HubSpot vs. SalesforceCRM Contender Series: HubSpot vs. Salesforce
CRM Contender Series: HubSpot vs. SalesforceBrainSell Technologies
 
Large Language Models for Test Case Evolution and Repair
Large Language Models for Test Case Evolution and RepairLarge Language Models for Test Case Evolution and Repair
Large Language Models for Test Case Evolution and RepairLionel Briand
 
What is Advanced Excel and what are some best practices for designing and cre...
What is Advanced Excel and what are some best practices for designing and cre...What is Advanced Excel and what are some best practices for designing and cre...
What is Advanced Excel and what are some best practices for designing and cre...Technogeeks
 
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdfGOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdfAlina Yurenko
 
SpotFlow: Tracking Method Calls and States at Runtime
SpotFlow: Tracking Method Calls and States at RuntimeSpotFlow: Tracking Method Calls and States at Runtime
SpotFlow: Tracking Method Calls and States at Runtimeandrehoraa
 
Call Us🔝>༒+91-9711147426⇛Call In girls karol bagh (Delhi)
Call Us🔝>༒+91-9711147426⇛Call In girls karol bagh (Delhi)Call Us🔝>༒+91-9711147426⇛Call In girls karol bagh (Delhi)
Call Us🔝>༒+91-9711147426⇛Call In girls karol bagh (Delhi)jennyeacort
 

Recently uploaded (20)

Sending Calendar Invites on SES and Calendarsnack.pdf
Sending Calendar Invites on SES and Calendarsnack.pdfSending Calendar Invites on SES and Calendarsnack.pdf
Sending Calendar Invites on SES and Calendarsnack.pdf
 
Innovate and Collaborate- Harnessing the Power of Open Source Software.pdf
Innovate and Collaborate- Harnessing the Power of Open Source Software.pdfInnovate and Collaborate- Harnessing the Power of Open Source Software.pdf
Innovate and Collaborate- Harnessing the Power of Open Source Software.pdf
 
Patterns for automating API delivery. API conference
Patterns for automating API delivery. API conferencePatterns for automating API delivery. API conference
Patterns for automating API delivery. API conference
 
SensoDat: Simulation-based Sensor Dataset of Self-driving Cars
SensoDat: Simulation-based Sensor Dataset of Self-driving CarsSensoDat: Simulation-based Sensor Dataset of Self-driving Cars
SensoDat: Simulation-based Sensor Dataset of Self-driving Cars
 
Open Source Summit NA 2024: Open Source Cloud Costs - OpenCost's Impact on En...
Open Source Summit NA 2024: Open Source Cloud Costs - OpenCost's Impact on En...Open Source Summit NA 2024: Open Source Cloud Costs - OpenCost's Impact on En...
Open Source Summit NA 2024: Open Source Cloud Costs - OpenCost's Impact on En...
 
How to submit a standout Adobe Champion Application
How to submit a standout Adobe Champion ApplicationHow to submit a standout Adobe Champion Application
How to submit a standout Adobe Champion Application
 
Cyber security and its impact on E commerce
Cyber security and its impact on E commerceCyber security and its impact on E commerce
Cyber security and its impact on E commerce
 
UI5ers live - Custom Controls wrapping 3rd-party libs.pptx
UI5ers live - Custom Controls wrapping 3rd-party libs.pptxUI5ers live - Custom Controls wrapping 3rd-party libs.pptx
UI5ers live - Custom Controls wrapping 3rd-party libs.pptx
 
Global Identity Enrolment and Verification Pro Solution - Cizo Technology Ser...
Global Identity Enrolment and Verification Pro Solution - Cizo Technology Ser...Global Identity Enrolment and Verification Pro Solution - Cizo Technology Ser...
Global Identity Enrolment and Verification Pro Solution - Cizo Technology Ser...
 
Powering Real-Time Decisions with Continuous Data Streams
Powering Real-Time Decisions with Continuous Data StreamsPowering Real-Time Decisions with Continuous Data Streams
Powering Real-Time Decisions with Continuous Data Streams
 
Odoo 14 - eLearning Module In Odoo 14 Enterprise
Odoo 14 - eLearning Module In Odoo 14 EnterpriseOdoo 14 - eLearning Module In Odoo 14 Enterprise
Odoo 14 - eLearning Module In Odoo 14 Enterprise
 
Lecture # 8 software design and architecture (SDA).ppt
Lecture # 8 software design and architecture (SDA).pptLecture # 8 software design and architecture (SDA).ppt
Lecture # 8 software design and architecture (SDA).ppt
 
20240415 [Container Plumbing Days] Usernetes Gen2 - Kubernetes in Rootless Do...
20240415 [Container Plumbing Days] Usernetes Gen2 - Kubernetes in Rootless Do...20240415 [Container Plumbing Days] Usernetes Gen2 - Kubernetes in Rootless Do...
20240415 [Container Plumbing Days] Usernetes Gen2 - Kubernetes in Rootless Do...
 
CRM Contender Series: HubSpot vs. Salesforce
CRM Contender Series: HubSpot vs. SalesforceCRM Contender Series: HubSpot vs. Salesforce
CRM Contender Series: HubSpot vs. Salesforce
 
Advantages of Odoo ERP 17 for Your Business
Advantages of Odoo ERP 17 for Your BusinessAdvantages of Odoo ERP 17 for Your Business
Advantages of Odoo ERP 17 for Your Business
 
Large Language Models for Test Case Evolution and Repair
Large Language Models for Test Case Evolution and RepairLarge Language Models for Test Case Evolution and Repair
Large Language Models for Test Case Evolution and Repair
 
What is Advanced Excel and what are some best practices for designing and cre...
What is Advanced Excel and what are some best practices for designing and cre...What is Advanced Excel and what are some best practices for designing and cre...
What is Advanced Excel and what are some best practices for designing and cre...
 
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdfGOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
 
SpotFlow: Tracking Method Calls and States at Runtime
SpotFlow: Tracking Method Calls and States at RuntimeSpotFlow: Tracking Method Calls and States at Runtime
SpotFlow: Tracking Method Calls and States at Runtime
 
Call Us🔝>༒+91-9711147426⇛Call In girls karol bagh (Delhi)
Call Us🔝>༒+91-9711147426⇛Call In girls karol bagh (Delhi)Call Us🔝>༒+91-9711147426⇛Call In girls karol bagh (Delhi)
Call Us🔝>༒+91-9711147426⇛Call In girls karol bagh (Delhi)
 

Embedded Recipes 2019 - Knowing your ARM from your ARSE: wading through the technology terminology of an embedded SoC

  • 1. Knowing your ARM from your ARSE (or, how to iden fy the CPU features in your phone) Embedded Recipes, Paris Will Deacon <will@kernel.org> September, 2019 © 2019 Arm Limited
  • 2. Disclaimer/excuses: I no longer work at Arm! Arm are sponsoring this conference and have kindly paid for my travel to be here. I usually give fairly deep, low-level technical presenta ons, so this is a change for me. Feel free to stop/interrupt me during the talk. This presenta on is based on work done at Arm and is not part of my current employment 2 © 2019 Arm Limited
  • 3. Introduc on Linux kernel co-maintainer of arm64 architecture, ARM perf backends, SMMU drivers, atomics, locking, memory model, TLB invalida on… Worked for a decade in the Open-Source So ware group at Arm Contributed significantly to the Armv8 architecture Heavy exposure to the development of the Arm ecosystem Tend to be CPU centric Lots of insider knowledge required to overcome hurdles and develop successful system so ware for Arm… 3 © 2019 Arm Limited
  • 4. Spot the difference 4 © 2019 Arm Limited
  • 5. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) 5 © 2019 Arm Limited
  • 6. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’ 5 © 2019 Arm Limited
  • 7. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’ Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A… 5 © 2019 Arm Limited
  • 8. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’ Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A… …but usually people just say ARMv7 5 © 2019 Arm Limited
  • 9. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’ Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A… …but usually people just say ARMv7 For example, the Cortex-A7, or A7, which implements ‘Thumb-2’ 5 © 2019 Arm Limited
  • 10. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’ Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A… …but usually people just say ARMv7 For example, the Cortex-A7, or A7, which implements ‘Thumb-2’ Not be confused with the ‘Apple A7’, which is 64-bit according to wikipedia 5 © 2019 Arm Limited
  • 11. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’ Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A… …but usually people just say ARMv7 For example, the Cortex-A7, or A7, which implements ‘Thumb-2’ Not be confused with the ‘Apple A7’, which is 64-bit according to wikipedia Cortex-A7 also implements virtualisa on and SMP, unlike the Cortex-A8 which came out years before 5 © 2019 Arm Limited
  • 12. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’ Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A… …but usually people just say ARMv7 For example, the Cortex-A7, or A7, which implements ‘Thumb-2’ Not be confused with the ‘Apple A7’, which is 64-bit according to wikipedia Cortex-A7 also implements virtualisa on and SMP, unlike the Cortex-A8 which came out years before Recently, the Cortex-A77 was announced, which implements Armv8 and is 64-bit 5 © 2019 Arm Limited
  • 13. Everything is fine ARM7 was a 32-bit ARM CPU implemen ng ARMv3 (around 20 years ago) The ARM7TDMI variant was par cularly popular. The ‘T’ means ‘Thumb’ Nowadays, most 32-bit Arm CPUs tend to implement ARMv7-A… …but usually people just say ARMv7 For example, the Cortex-A7, or A7, which implements ‘Thumb-2’ Not be confused with the ‘Apple A7’, which is 64-bit according to wikipedia Cortex-A7 also implements virtualisa on and SMP, unlike the Cortex-A8 which came out years before Recently, the Cortex-A77 was announced, which implements Armv8 and is 64-bit Although the Cortex-A32 also implements Armv8 but is 32-bit only 5 © 2019 Arm Limited
  • 14. Even Pinhead is confused (July, 2012) “They have separate versions for their ‘architecture’ (ex: arm v8) and for their ‘implementa on’ (ex: ARM11), and maybe it all makes sense if you have drunk the ARM cool-aid and have joined the ARM cult, but to sane people and outsiders, it is just a f*cking mess.” “Christ. Seriously. The insanity is so strong in the ARM version names that it burns. If it really makes sense to anybody that ‘ARM A9’ (technically ‘Cortex-A9’, but nobody seems to use the ‘Cortex’ part at least in cellphones) is an ‘ARM-v7’ architecture microprocessor which is *completely* different from the ARM9 family, which in turn is different from ARMv9 that hasn’t happened yet, you need to have your head examined.” 6 © 2019 Arm Limited
  • 15. Even Pinhead is confused (July, 2012) “They have separate versions for their ‘architecture’ (ex: arm v8) and for their ‘implementa on’ (ex: ARM11), and maybe it all makes sense if you have drunk the ARM cool-aid and have joined the ARM cult, but to sane people and outsiders, it is just a f*cking mess.” “Christ. Seriously. The insanity is so strong in the ARM version names that it burns. If it really makes sense to anybody that ‘ARM A9’ (technically ‘Cortex-A9’, but nobody seems to use the ‘Cortex’ part at least in cellphones) is an ‘ARM-v7’ architecture microprocessor which is *completely* different from the ARM9 family, which in turn is different from ARMv9 that hasn’t happened yet, you need to have your head examined.” So let’s drink the ‘ARM cool-aid’ and figure out what’s going on… 6 © 2019 Arm Limited
  • 16. Documenta on: off to a good start Everything you need to know is described in a handy book! Hilariously called the ‘Arm ARM’ (miraculously, you can search for this) Almost 8000 pages long Sporadic releases; usually not quite up-to-date (arch changes weekly) Acts as a reference, not as a learning resource. Deliberately avoids CPU details. Did you know? 7 © 2019 Arm Limited
  • 17. Documenta on: off to a good start Everything you need to know is described in a handy book! Hilariously called the ‘Arm ARM’ (miraculously, you can search for this) Almost 8000 pages long Sporadic releases; usually not quite up-to-date (arch changes weekly) Acts as a reference, not as a learning resource. Deliberately avoids CPU details. Did you know? If you printed a copy for every shipped CPU, it would reach Mars and back 500x! 7 © 2019 Arm Limited
  • 18. The Arm ARM: Maybe not so handy a er all? “Any interrupt that is pending before a Context synchroniza on event in the following list, is taken before the first instruc on a er the context synchronizing event, provided that the pending interrupt is not masked: Execu on of an ISB instruc on. Excep on entry, if ARMv8.5-CSEH is not implemented, or if ARMv8.5-CSEH is implemented and the appropriate SCTLR_ELx.EIS bit is set. Excep on return, if ARMv8.5-CSEH is not implemented or if ARMv8.5-CSEH is implemented and the appropriate SCTLR_ELx.EOS bit is set. Exit from Debug state.” 8 © 2019 Arm Limited
  • 19. The Arm ARM: Maybe not so handy a er all? “Any interrupt that is pending before a Context synchroniza on event in the following list, is taken before the first instruc on a er the context synchronizing event, provided that the pending interrupt is not masked: Execu on of an ISB instruc on. Excep on entry, if ARMv8.5-CSEH is not implemented, or if ARMv8.5-CSEH is implemented and the appropriate SCTLR_ELx.EIS bit is set. Excep on return, if ARMv8.5-CSEH is not implemented or if ARMv8.5-CSEH is implemented and the appropriate SCTLR_ELx.EOS bit is set. Exit from Debug state.” This is not the ‘cool-aid’ you are looking for. Hurdle 1: Arm is mostly inaccessible to developers on the outside. 8 © 2019 Arm Limited
  • 20. Important terminology Architecture vs micro-architecture Core license vs architecture license Diversity vs fragmenta on CPU vs SoC ISA vs system architecture Understanding these differences is crucial to picking apart and understanding the Arm ecosystem. 9 © 2019 Arm Limited
  • 21. Architecture vs Micro-architecture Architecture is the contract between hardware and so ware. It describes the portable guarantees provided by the hardware, without dicta ng how they are implemented, and is typically specified in English. Arm has three architecture profiles: A, R and M (more hilarity). Approx. 5yr lag. Micro-architecture relates to the design of a specific piece of hardware, and is typically specified in a hardware descrip on language such as Verilog. 10 © 2019 Arm Limited
  • 22. Architecture vs Micro-architecture Architecture is the contract between hardware and so ware. It describes the portable guarantees provided by the hardware, without dicta ng how they are implemented, and is typically specified in English. Arm has three architecture profiles: A, R and M (more hilarity). Approx. 5yr lag. Micro-architecture relates to the design of a specific piece of hardware, and is typically specified in a hardware descrip on language such as Verilog. So ware analogy: The C language standard is the architecture, whereas the toolchain source code (e.g. GCC + GLIBC) is the micro-architecture. Arm develop both architectures and micro-architectures as licensable products! 10 © 2019 Arm Limited
  • 23. Architecture vs Micro-architecture Architecture is the contract between hardware and so ware. It describes the portable guarantees provided by the hardware, without dicta ng how they are implemented, and is typically specified in English. Arm has three architecture profiles: A, R and M (more hilarity). Approx. 5yr lag. Micro-architecture relates to the design of a specific piece of hardware, and is typically specified in a hardware descrip on language such as Verilog. So ware analogy: The C language standard is the architecture, whereas the toolchain source code (e.g. GCC + GLIBC) is the micro-architecture. Arm develop both architectures and micro-architectures as licensable products! Hurdle 2: This dis nc on is far less significant on other architectures such as x86. 10 © 2019 Arm Limited
  • 24. Hysterical raisins <=ARMv4 When dinosaurs roamed the Earth ARMv5 2000, Baseline, Xscale ARMv6 2002, SMP (sort of), ARM11 ARMv7-A 2005, Virtualisa on, VMSA architecture, Cortex-A8 Armv8-A 2011, 64-bit ISA (AArch64), Cortex-A53 Armv8.1-A 2014, LSE atomics, Cavium ThunderX Armv8.2-A 2015, RAS extensions, Cortex-A77 Armv8.3-A 2016, Pointer authen ca on, Vortex? Armv8.4-A 2017, MPAM Armv8.5-A 2018, MTE 11 © 2019 Arm Limited
  • 25. Hysterical raisins <=ARMv4 When dinosaurs roamed the Earth ARMv5 2000, Baseline, Xscale ARMv6 2002, SMP (sort of), ARM11 ARMv7-A 2005, Virtualisa on, VMSA architecture, Cortex-A8 Armv8-A 2011, 64-bit ISA (AArch64), Cortex-A53 Armv8.1-A 2014, LSE atomics, Cavium ThunderX Armv8.2-A 2015, RAS extensions, Cortex-A77 Armv8.3-A 2016, Pointer authen ca on, Vortex? Armv8.4-A 2017, MPAM Armv8.5-A 2018, MTE Hurdle 3: Many features op onal! Discoverable at run me using ID registers. 11 © 2019 Arm Limited
  • 26. Licensing Why is the product naming so inconsistent? Partly due to the licensing model: Core license to include a specific Arm CPU design in your SoC. Minor modifica on may be permi ed. Architecture license to design your own CPU from scratch which implements the Arm architecture and allow your marke ng team to call it whatever they like This means that Arm’s architecture partners are also indirect compe tors! 12 © 2019 Arm Limited
  • 27. Licensing Why is the product naming so inconsistent? Partly due to the licensing model: Core license to include a specific Arm CPU design in your SoC. Minor modifica on may be permi ed. Architecture license to design your own CPU from scratch which implements the Arm architecture and allow your marke ng team to call it whatever they like This means that Arm’s architecture partners are also indirect compe tors! Hurdle 4: Important that Arm doesn’t produce produc on silicon as an SoC 12 © 2019 Arm Limited
  • 28. The Arm ecosystem 13 © 2019 Arm Limited
  • 29. Playing ‘Switzerland’ Arm’s influence is in the power of the partnership and underlying pla orm; on its own, it’s rela vely ny in revenue terms: Qualcomm 22B USD (2018) Intel 70B USD (2018) Samsung 211B USD (2017) 14 © 2019 Arm Limited
  • 30. Playing ‘Switzerland’ Arm’s influence is in the power of the partnership and underlying pla orm; on its own, it’s rela vely ny in revenue terms: Qualcomm 22B USD (2018) Intel 70B USD (2018) Samsung 211B USD (2017) Arm <1B GBP (2015) Greater than the sum of its parts, but driven by consensus. 14 © 2019 Arm Limited
  • 31. Playing ‘Switzerland’ Arm’s influence is in the power of the partnership and underlying pla orm; on its own, it’s rela vely ny in revenue terms: Qualcomm 22B USD (2018) Intel 70B USD (2018) Samsung 211B USD (2017) Arm <1B GBP (2015) Greater than the sum of its parts, but driven by consensus. Hurdle 5: Limited ability to mandate standards compliance or move goalposts 14 © 2019 Arm Limited
  • 32. Diversity vs Fragmenta on ‘Pick ‘n’ mix’ architecture reigned in slightly by desire for so ware re-use: PSCI to bring CPUs up and down SBSA cer fica on for server system designs Trusted firmware open-source boiler-plate Linux/KVM upstream-first approach 15 © 2019 Arm Limited
  • 33. Diversity vs Fragmenta on ‘Pick ‘n’ mix’ architecture reigned in slightly by desire for so ware re-use: PSCI to bring CPUs up and down SBSA cer fica on for server system designs Trusted firmware open-source boiler-plate Linux/KVM upstream-first approach Hurdle 6: S ll a tendancy towards fragmenta on between SoCs https://www.mono-project.com/news/2016/09/12/arm64-icache/ 15 © 2019 Arm Limited
  • 34. How does Linux cope? The arm64 Linux kernel is wri en to the architecture and aims to abstract away the underlying bag of bits baked into silicon: Single defconfig binary image for all AArch64 CPUs Heavy use of ‘alterna ve’ instruc on patching uarch-specific features not worth the effort… …apart from errata workarounds and side-channels Heterogeneous systems are a headache Exposed to userspace via proc, sys, ELF HWCAP and MRS instruc ons Details in Documentation/arm64/cpu-feature-registers.rst Email the list if you need more: linux-arm-kernel@lists.infradead.org 16 © 2019 Arm Limited
  • 35. Fire up the simula on 17 © 2019 Arm Limited
  • 36. Where do I start? / What’s in the box? 1. Ignore all the marke ng junk 2. Iden fy the SoC 3. Iden fy the CPU(s) – Arm derived? 4. Iden fy architecture version 5. Iden fy features 6. https://wikichip.org 18 © 2019 Arm Limited
  • 37. Some example devices 19 © 2019 Arm Limited
  • 38. Example 1: Libre Computer ‘La Frite’ They say… AML-S805X-AC is the perfect development pla orm for projects that require highly performant ARM Cortex-A class CPUs, small compact form factor, secure and non-secure 1080P media delivery and playback, high reliability, and low power. 20 © 2019 Arm Limited
  • 39. Example 1: Libre Computer ‘La Frite’ They say… AML-S805X-AC is the perfect development pla orm for projects that require highly performant ARM Cortex-A class CPUs, small compact form factor, secure and non-secure 1080P media delivery and playback, high reliability, and low power. Soc is Amlogic S805x 4x ARM Cortex-A53 @ 1.2GHz Cortex-A53 is a 64-bit core implemen ng ARMv8.0 Usually the ‘Li le’ in early ‘big.Li le’ designs ARM says… The most widely-used processor with balanced performance and efficiency 20 © 2019 Arm Limited
  • 40. Example 2: Samsung Galaxy S9 They say… 10nm 64-bit Octa-Core Processor 2.8GHz + 1.7GHz (Maximum Clock Speed, Performance Core + Efficiency Core) 21 © 2019 Arm Limited
  • 41. Example 2: Samsung Galaxy S9 They say… 10nm 64-bit Octa-Core Processor 2.8GHz + 1.7GHz (Maximum Clock Speed, Performance Core + Efficiency Core) SoC appears to be Samsung Exynos 9810 (in Europe) Wikichip claims this features 4xMongoose 3 plus 4xCortex-A55 cores Cortex-A55 designed by Arm and implements ARMv8.2 Mongoose 3 designed by Samsung and implements ARMv8.0 21 © 2019 Arm Limited
  • 42. Example 2: Samsung Galaxy S9 They say… 10nm 64-bit Octa-Core Processor 2.8GHz + 1.7GHz (Maximum Clock Speed, Performance Core + Efficiency Core) SoC appears to be Samsung Exynos 9810 (in Europe) Wikichip claims this features 4xMongoose 3 plus 4xCortex-A55 cores Cortex-A55 designed by Arm and implements ARMv8.2 Mongoose 3 designed by Samsung and implements ARMv8.0 The Cortex-A55 implements more instruc ons than the Mongoose 3! https://medium.com/@jadr2ddude/ a-big-little-problem-a-tale-of-big-little-gone-wrong-e7778ce744bb 21 © 2019 Arm Limited
  • 43. Example 3: Motorola moto z4 They say… Feel the speed of a Qualcomm® Snapdragon™ 675 processor that’s 57% faster than moto z3 play. It’s a phone built to keep up with you. 22 © 2019 Arm Limited
  • 44. Example 3: Motorola moto z4 They say… Feel the speed of a Qualcomm® Snapdragon™ 675 processor that’s 57% faster than moto z3 play. It’s a phone built to keep up with you. It’s an SoC not a bloody processor! Qualcomm say… CPU Cores: Qualcomm® Kryo™ 460 CPU, Octa-core CPU…built on Arm Cortex technology… 22 © 2019 Arm Limited
  • 45. Example 3: Motorola moto z4 They say… Feel the speed of a Qualcomm® Snapdragon™ 675 processor that’s 57% faster than moto z3 play. It’s a phone built to keep up with you. It’s an SoC not a bloody processor! Qualcomm say… CPU Cores: Qualcomm® Kryo™ 460 CPU, Octa-core CPU…built on Arm Cortex technology… Wikichip to the rescue! Kryo 460 Silver => Cortex-A55 Kryo 460 Gold => Cortex-A76 Both implement ARMv8.2 ‘The two big disclosed changes are an increase of the core’s reorder buffer from 128 entries to a higher, unspecified amount, as well as tuning the prefetchers to be er work with floa ng point workloads.’ https://www.anandtech.com/show/14072/the-samsung-galaxy-s10plus-review/3 22 © 2019 Arm Limited
  • 46. Ques ons? Please contact support@arm.com! The Arm trademarks featured in this presenta on are registered trademarks or trademarks of Arm Limited (or its subsidiaries) in the US and/or elsewhere. All rights reserved. All other marks featured may be trademarks of their respec ve owners. www.arm.com/company/policies/trademarks © 2019 Arm Limited
  • 47. Image references 1. Colin Davis, ‘Veins in my Right Arm’. Cropped from https://live.staticflickr.com/3382/3554305017_053fee6793_b_d.jpg - CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) 2. Marco Verch, ‘Bauarbeiterdekoltee’. Unmodified from https://live.staticflickr.com/4357/36221532814_779c61e968_k_d.jpg - CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) 3. DJRphoto36, ‘Angry Penguin’. Unmodified from https://live.staticflickr.com/5056/5496520090_e9aa83dc0b_b_d.jpg - CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) 4. Kevin Gill, ‘Mars’. Unmodified from https://live.staticflickr.com/2107/32789125872_f0184cc247_k_d.jpg - CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) 5. Pablo Cabezos, ‘King College´s chapel (Cambridge)’. Unmodified from https://live.staticflickr.com/8300/29112354294_3c0f166ec1_b_d.jpg - CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) 6. kecia85, ‘Dic onary-007’. Unmodified from https://live.staticflickr.com/8322/7983928912_f18c81fb31_o_d.jpg - CC BY-SA 2.0 (https://creativecommons.org/licenses/by-sa/2.0/) 7. Images Money, ‘Money’. Unmodified from https://live.staticflickr.com/6029/5929622407_e474db378d_k_d.jpg - CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) 8. wisegie, ‘Swiss flag’. Unmodified from https://live.staticflickr.com/6082/6078034891_ca23bb39a8_b_d.jpg - CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) 9. The DLC, ‘Buffet line’. Cropped from https://live.staticflickr.com/1369/4734507240_57b0244541_h_d.jpg - CC BY-SA 2.0 (https://creativecommons.org/licenses/by-sa/2.0/) 10. lewing@isc.tamu.edu Larry Ewing and The GIMP, ‘Tux penguin’. Unmodified from https://commons.wikimedia.org/wiki/File:Tux.png 11. Cur s Alan Jackson, ‘A er this, I give up. Probably.’. Unmodified from https://live.staticflickr.com/5097/5418579238_d28022927c_h_d.jpg - CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) 24 © 2019 Arm Limited