android os porting r3 090624233419 phpapp01

8/11/2019 Android Os Porting r3 090624233419 Phpapp01

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Android Porting

by Jollen Chen

email: [email protected]

blog: jollen.org/blogplurk: www.plurk.com/jollenchen

Text

Text

www.jollen.tw
http://www.plurk.com/jollenchenmailto:[email protected]://www.jollen.tw/http://www.jollen.tw/http://www.plurk.com/jollenchenhttp://www.plurk.com/jollenchenmailto:[email protected]:[email protected]:[email protected]:[email protected]


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Section 1. Android Kernel

www.jolle.tw
http://www.jollen.org/http://www.jollen.org/


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Android porting, Android hardware

!product

!

!

Android Porting


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new productAndroid

!cupcake armv4/armv5/x86

API Level

!Android

Vanilla Kernel Configs

!Android framework

Non-Vanilla Kernel

!Merge Android framework

Android Porting:


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!Android frameworklibrary

Android framework!ASHMEMwakelock

shared library

!Android framework

!case study: FreeRunner

Android Porting:


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2007.11.5: Android

2007.11.12: Adnroid SDK early look version

2008.1.3: Adnroid Developer Challenge

2008.2.13: Android SDK m5-rc15

2008.5.12: Top 50 Android Application

API Level


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Phone

Netbook

Devices

ARMv4/v5

x86

misc...


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MMS

WebView Touch events

WebView SquirrelFish (JavaScript engine)

IME

Basic x86 support

SIM Application Toolkit 1.0

...

Cupcake


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android-porting


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android.git.kernel.org

1. Cupcake x86 ports

2. ./.repo/manifest.xml

eee_701 platform x86 ports

Android Source Code


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Android / armv4


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Media Framework

Surface Manager

Shared Libraries

Applications

Application Framework

Dalvik VM

System

Image

change

Linux Kernel

Application Developers


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Product Branch Maintainer

Media Framework

Surface Manager

Shared Libraries

Applications


Dalvik VM

Linux Kernel

rebuild


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Hardware Developing

Media Framework

Surface Manager

Shared Libraries

Applications


Dalvik VM

Linux Kernel

change

change


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android-toolchain-20081019

!http://android.git.kernel.org/pub/

gcc 4.2.1 / binutils 2.17 / gdb 6.6

ARMV5te+

ABI: EABI, AAPCS

--with-float=soft --with=fpu-vfp

--enable-threads (single)

Android Toolchain
http://android.git.kernel.org/pub/http://android.git.kernel.org/pub/http://android.git.kernel.org/pub/


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Binder

Ashmem (Android shared memory)

PMEM (Processor memory allocator)

logcat (Android Logger)

wakelock (Android Power Management)

Alarm

Android Kernel


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Android IPC

/proc/binder

!state

!stats

!transactions

!transation_log

!failed_transation_log

binder


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drivers/misc/pmem.c

userspace driver

PMEM


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Android OS

native program


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Android

Android source code (Cupcake)

Toolchain

EeePC


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Hardware

Kernel

glibc & shared libs

native C programs

S!"#$%&'((

Linux


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Hardware

Kernel

Application

Android Framework

S!"#$%&'((

JNI

bionic & shared libs

Android


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S!"#$%&'((

JNI

onCreate()Activity

onCreate()myActivity

MediaPlayer

OpenCore

bionic

Android


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Section 2. Build Android

www.jolle.tw
http://www.jollen.org/http://www.jollen.org/


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Build system (toolchain).

Dalvik::JNI

Dalvik::Interpreter

Bionic

System call

Android


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Makefile

macros

/build/core/combo

darwin-x86.mk

javac.mk

linux-arm.mk

linux-x86.mk

select.mk

target_linux-x86.mk

windows-x86.mk


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GLOBAL CFLAGS


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GLOBAL CFLAGS for ARMv4


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JNI Porting/dalvik/vm/arch

generic/

arm/

x86

CallEABI.S

CallOldABI.S

Call386ABI.S


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ARM EABI


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JNI Entry


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Assembly Code #2: armv4/armv5


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Dalvik

Interpreter/dalvik/vm/mterp

common/

armv4/

armv5te/

x86/


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Bionic/bionic

libc/

libdl/

libm/

libstdc++/

libthread_db/

linker/


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Bionic::libc/bionic/libc

arch-arm/

arch-x86/

kernel/

arch-arm/asm/

arch-x86/asm/


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bionic/libc/kernel/kernel header files

Android kernel header Linux kernel header

userspace

Android Generated Kernel Header


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Android libraryshared library

library

opencore

External Library


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sonivox & OpenSSL


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SurfaceHolder type SURFACE_TYPE_GPU GPU

Graphics Processing Unit

SurfaceHolder type SURFACE_TYPE_HARDWARE

DMA

userspace

Android & Kernel


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Surface Manager Media Framework

SurfaceHolder type SURFACE_TYPE_GPU GPU

Graphics Processing Unit

SurfaceHolder type SURFACE_TYPE_HARDWARE

DMA

MediaPlayer OpenCore

Android


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Media Framework

Media Framework OpenCore


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New Product File Tree


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1. Get Google Android

$ repo init -u git://android.git.kernel.org/platform/manifest.git -b cupcake$ repo sync

2. Manifest file.

...

...

3. Get EeePC platform.

$ repo sync

4. Build Android image.$ TARGET_ARCH=x86 TARGET_PRODUCT=eee_701DISABLE_DEXPREOPT=true make -j2 installer_img

5. Create USB boot stick.

Use make-live script. https://review.source.android.com/Gerrit#change,6475

Android x86 port (target product = EeePC 701)
https://review.source.android.com/Gerrit#https://review.source.android.com/Gerrit#https://review.source.android.com/Gerrit#


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$(call inherit-product, $(SRC_TARGET_DIR)/product/generic.mk)

PRODUCT_NAME := eee_701PRODUCT_DEVICE := eee_701PRODUCT_POLICY := android.policy_midPRODUCT_PROPERTY_OVERRIDES += \ ro.com.android.dataroaming=true

Build EeePC 701 Product Tips # Google API issue

Cupcake Google APIs add-ons


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external/e2fsprogs/Android.mk:--- a/Android.mk

+++ b/Android.mk

@@ -1,3 +1,3 @@

ifneq ($(TARGET_SIMULATOR),true)

-# include $(call all-subdir-makefiles)

+ include $(call all-subdir-makefiles)

endif

Build EeePC 701 Product Tips # e2fsprogs issue


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boot.img

installer.img

ramdisk.img

system.img

userdata.img

Android Image Files


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installer.img VDI


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Android Kernerl Configs


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Android Init Process

device/system/init

device/system/init/init.c

/etc/init.rc

mount file system (/etc/fstab)


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Zygote Process Startup


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s3c2410 / s3c244x

Neo FreeRunner

Mokofly (coming...)

Android FreeRunner


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