Tweaking Google TV emulator

Tweaking Google TV emulator 2011.8.28 Tetsuyuki Kobayashi 1

Who am I? 20+ years involved in embedded systems  10 years in real time OS, such as iTRON  10 years in embedded Java Virtual Machine  Now GCC, Linux, QEMU, Android, … Blogs  http://d.hatena.ne.jp/embedded/ (Personal)  http://blog.kmckk.com/ (Corporate)  http://kobablog.wordpress.com/(English) Twitter  @tetsu_koba 2

Todays topic Google TV add-on What is KVM? Tweaking Google TV emulator  Why NDK doesnt work?  How to run it on Windows 7 3

Google TV add-on Add-on for Android SDK to develop Google TV apps. http://code.google.com/tv/android/docs/gtv_addon.html Existing Java apps can run on it, but need modification for TV UI. Display Guidelines, UI Control Guidelines 4

From FAQ, Google TV version 2 is ...  Android 3.1.  NDK is not currently supported  Chrome 11 (OTA upgradeable)  Flash 10.1  Native client app support is not currently available.  continue to support the h.264 video codec for the HTML5 <video> tag. 5

Google TV emulator Target CPU is x86 (ATOM) KVM required  It means only Linux  Windows and Mac is currently not supported Open GL rendering by software  Not accelerated by GPU 6

What is KVM? Kernel Based Virtual Machine Host OS: x86 Linux, with Intel VT or AMD-V Guest CPU must be the same as host CPU used with QEMU http://www.linux-kvm.org/page/Main_Page 7

How it works Usual QEMU  emulates all instructions.  MMU is emulated by software, too. QEMU + KVM  mostly executed by real CPU.  hooks only I/O instructions. 8

Setup KVM On Ubuntu  $ sudo apt-get install kvm On Ubuntu 10.04  $ sudo chmod a+rw /dev/kvm (On Ubuntu 11.04 it worked without this) See also 9  http://code.google.com/tv/android/docs/gtv_emulator.html

Comparison by boot up timeUbuntu 10.04 KVM Off 52Ubuntu 10.04 KVM On 32Ubuntu 11.04 KVM Off 52Ubuntu 11.04 KVM On 17 0 10 20 30 40 50 60 (Smaller is better)KVM is tuning up. Newer version is faster! 10

Tweaking Google TV emulator Why NDK doesnt work? How to run it on Windows 7 11

NDK for x86 NDKr6 supports x86 You can build x86 emulator and Android image from AOSP source code NDK for x86 works fine in this environment 12

But it doesnt work in Google TV. Why? Google TV runtime is different from Android. Dynamic linker and libc is not bionics, it seems to be glibcs. NDK r6 assumes bionic runtime. 13

Zygote maps in Android …afa00000-afa03000 r-xp 00000000 1f:00 380 /system/lib/liblog.soafa03000-afa04000 rwxp 00003000 1f:00 380 /system/lib/liblog.soafb00000-afb20000 r-xp 00000000 1f:00 348 /system/lib/libm.soafb20000-afb21000 rwxp 00020000 1f:00 348 /system/lib/libm.soafc00000-afc01000 r-xp 00000000 1f:00 326 /system/lib/libstdc++.soafc01000-afc02000 rwxp 00001000 1f:00 326 /system/lib/libstdc++.soafd00000-afd40000 r-xp 00000000 1f:00 351 /system/lib/libc.soafd40000-afd43000 rwxp 00040000 1f:00 351 /system/lib/libc.soafd43000-afd4e000 rwxp afd43000 00:00 0b0001000-b0009000 r-xp 00001000 1f:00 606 /system/bin/linkerb0009000-b000a000 rwxp 00009000 1f:00 606 /system/bin/linkerb000a000-b0013000 rwxp b000a000 00:00 0bedaa000-bedbf000 rw-p befeb000 00:00 0 [stack] 14

Zygote maps in Google TVb7544000-b7699000 r-xp 00000000 00:01 44 /lib/libc-2.12.2.sob7699000-b769b000 r--p 00155000 00:01 44 /lib/libc-2.12.2.sob769b000-b769c000 rw-p 00157000 00:01 44 /lib/libc-2.12.2.sob769c000-b769f000 rw-p 00000000 00:00 0b769f000-b76c2000 r-xp 00000000 00:01 51 /lib/libm-2.12.2.sob76c2000-b76c3000 r--p 00023000 00:01 51 /lib/libm-2.12.2.sob76c3000-b76c4000 rw-p 00024000 00:01 51 /lib/libm-2.12.2.so ...b7879000-b787d000 r-xp 00000000 1f:00 469 /system/lib/liblog.sob787d000-b787e000 rw-p 00003000 1f:00 469 /system/lib/liblog.sob787e000-b7896000 r-xp 00000000 00:01 61 /lib/libpthread-2.12.2.sob7896000-b7897000 ---p 00018000 00:01 61 /lib/libpthread-2.12.2.sob7897000-b7898000 r--p 00018000 00:01 61 /lib/libpthread-2.12.2.sob7898000-b7899000 rw-p 00019000 00:01 61 /lib/libpthread-2.12.2.sob7899000-b789b000 rw-p 00000000 00:00 0 ...b78ac000-b78ad000 r-xp 00000000 00:00 0 [vdso]b78ad000-b78c9000 r-xp 00000000 00:01 42 /lib/ld-2.12.2.sob78c9000-b78ca000 r--p 0001b000 00:01 42 /lib/ld-2.12.2.sob78ca000-b78cb000 rw-p 0001c000 00:01 42 /lib/ld-2.12.2.sobfdda000-bfdfb000 rw-p 00000000 00:00 0 [stack] 15

How to run Google TV emulator on Windows7 Yes, KVM is tightly coupled with Linux. But without KVM, does it work on Windows or Mac? 16

Elements of Google TV emulator (1) Emulator executable (using QEMU + KVM) (2) Image of target Linux kernel (3) Images of target file system (4) Skin image files AVD files configure (1)-(4). Only (1) depends on host OS. 17

Lets try Android SDK for windows already have emulator-x86.exe Copy the reset files from Linux  $SDK/add-ons/addon_google_tv_google_inc_12  $HOMEPATH/.android/avd/<avd>.ini  $HOMEPATH/.android/avd/<avd>.avd Correct file path in each *.ini files 18

Start Google TV emulator on Windows Start the emulator with the copied avd from command prompt  emulator -avd <avd> It worked!  But too slow to use! I understand how emulator works! 19

Resources Previous Google TV session by @kisima  http://d.hatena.ne.jp/machaut/20110213/1297613974 KVM session at 1st KernelVM 探検隊  http://www.slideshare.net/ozax86/linux-kvm How to build emulator-x86  http://d.hatena.ne.jp/embedded/20110710/p1 How to build linux kernel for emulator-x86  http://blog.kmckk.com/archives/3882660.html 20

Demo / Q & A Thank you for listening! Any comments to blogs are welcome.@tetsu_koba 21

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Tweaking Google TV emulator

by Tetsuyuki Kobayashi

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