java se embedded hardfp abi spport in 7u40
DESCRIPTION
Insights into the new Hard Floating Point Application Binary Interface support in Java SE Embedded for ARM processors now available in 7u40TRANSCRIPT
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Java SE EmbeddedHardFP ABI SupportRoger BrinkleyJava Technology Ambassador Oracle, Corp.
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Java SE Embedded Overview
Java Standard Edition implementation optimized for embedded devices
– Reduced static footprint (60%+ smaller than standard JRE) 42MB versus 140MB on x86 Linux Java SE 7u6
– Reduced memory requirements (32MB headless, 64MB headful)
– Headless and headful configurations
– Embedded architectures supported (ARM, PPC, x86)
– Full Java SE compatibility
– Free for development, commercial license for deployment
What is Java SE Embedded?
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Java SE Embedded Shipping ProductsPreviously Supported Platforms and Releases
Processor Operating System
Headless orHeadful FPU Java SE
Version
ARM v6/v7 Linux Headful VFP JDK 7u21
ARMv5 Linux Headless Soft JRE 7u21
ARMv6/v7 Linux Headless &Headful (v7) VFP JRE 7u21
ARMv7 (Server JIT) Linux Headless VFP JRE 7u21
PowerPC e600 & e500mc core Linux Headless Classic HW FP JRE 7u21
PowerPC e500v2 core Linux Headless Embedded FP JRE 7u21
x86 Linux Headless X86 JRE 7u21
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Why all the HardFP ABI Fuss
Standard ARMv5 chips had no FPU (aka VFP Vector Floating Point) With ARMv6 and v7, VFP became common OS’s, Toolchains and native apps supported Soft Float ABI Underlying Linux platforms and toolchains started to support HardFP
ABI Developers were requesting HardFP ABI support
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Differences between SoftFP and HardFP ABI
SoftFP ABI
HardFP ABI
CPU supports floating point instructions Yes Yes
Floating point arguments passed native to native On stackFPU
registers
Floating point instructions passed between Java methodsFPU
registersFPU
registers
Floating point instructions b/w JVM and nativeOn stack
FPU registers
Floating Point intensive apps such as games, graphics, etcSlower Faster
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JAVA SE EMBEDDED 7U40 HARDFP ABI SUPPORT FOR ARM PLATFORM
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Orace Java SE Embedded Download TableArm HardFP API
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Orace Java SE Embedded Download TableArm SoftFP API
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Orace Java SE Embedded Download TablePower PC, X86
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What this Means for Developers
First officially support JavaSE Embedded Release with HardFP ABI support
– ARMv7 as well as ARMv6(e.g. R/Pi)
More OEM usage Speed increase
– Common Java benchmarks see 5% to 8% improvement
– Results are application specific and will vary
No code change– Except for Native Code
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Popular ARM Embedded Systems for Developers
Raspberry Pi700 MHz ARMv6256MB RAMHDMI, DSI, Composite VideoCore IV, 3.5mm Audio Jack2 USB 2.0, SD / MMC/ SDIO 10/100 Ethernet3.5 Watts @ 5VCost $35 + Power Cord
i.MX6q1 GHz Quad-Core ARM Cortex A91GB RAM3 display ports (RGB, LVDS, HDMI 1.4a)3 USB 2.0, dual 3.0/SDXC1 CAN2, 1 I2CPCIe, SATA 2.5 @ 3Gbps10/100/Gb Ethernet
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Resources Java SE Embedded Home
http://www.oracle.com/technetwork/java/embedded/overview/javase/index.html
Java SE Embedded Downloadshttp://www.oracle.com/technetwork/java/embedded/downloads/javase/index.html
Java SE Embedded System Requirementshttp://www.oracle.com/technetwork/java/embedded/resources/se-embeddocs/index.html#sysreqs
Java SE Embedded Communityhttp://community.java.net/community/embedded
Oracle Internet of Things Platformhttp://www.oracle.com/us/solutions/internetofthings/index.html
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