Overview of Qualcomm 5g intelligent platform

qualcomm 5G Overview of intelligent platform

qualcomm android The software of smartphone solution consists of two parts

1. With linux Operating system based android System
2. With L4,REX On the basis of Modem part

In the architecture of Qualcomm series , One IC Internal integration has two ARM processor , One ARM9（ perhaps arm11）, Specifically responsible for handling communication protocols , RF and GPIO etc. , The software architecture adopts AMSS, The other is ARM11, Used to deal with Multimedia , Upper application , And some other tasks , The running system is android System , The two processors communicate with each other by sharing memory .

What is? L4,REX,BREW,AMSS And the relationship between them

L4 It's a set of computer programs , Is originally from Jochen Liedtke The operating system kernel of the designed microkernel architecture , Now it has formed a family of microkernels .L4 This microkernel system has been recognized by the computer industry because of its excellent performance and small size , It has been transplanted to many different hardware architectures . High pass L4 It provides the most basic operation of the operating system , It's someone else's .

Most of the early operating systems were Monolithic Kernel, It means the whole operating system – Include Scheduling ( Dispatch ), File system ( file system ), Networking ( The Internet ), Device driver ( Device driver ), Memory management ( Storage management ), Paging( Storage page management ) – All done in the kernel . Until now, the widely used operating system , Such as UNIX,Linux, and Windows Mostly monolithic kernel operating system . But as the operating system becomes more and more complex ( The kernel of modern operating system has one or two million lines C Programs are a very common thing ), Putting all these functions in the kernel makes the design more difficult .

Microkernel It's a relationship with Monolithic Kernel The opposite design concept . Its purpose is to minimize the size of the kernel , Remove all possible functional modules from the kernel . Ideally , Only... Is left in the kernel Address Space Support( Address space support ),IPC (Inter-Process Communication, Interprocess communication ), and Scheduling( Dispatch ), Other functional modules run as user processes .

REX Is in L4 Services encapsulated above , It's a preemptive , Multitasking RTOS, All tasks are based on task There is a form of ,REX Includes task creation , Sync , Mutually exclusive , timer , Interrupt control and other functions API, there task It's actually our thread , Every task Corresponding to a thread .REX Maintain a task list( Double linked list ), Always run high priority task.products All the services in it include 3g The protocol stack is based on task Run in the form of rex Above .

and Brew If so, it is the running environment , Follow Java It's a bit like , It's like a virtual machine .

AMSS―― Advanced mobile user software (Advanced Mobile Subscriber Software) technology , Is a new software architecture , It's about the original software architecture DMSS The upgrade . AMSS The source code is actually QC BREW(Binary Runtime Environment For Wireless) The bottom part of the platform , Removed the need to provide an interface to the application AEE(application execution environment) part , Qualcomm in Dual Proc Other platforms on the chip basically adopt this architecture .

Reference documents ：
Microkernel operating system and its application L4 summary
http://wenku.baidu.com/view/90929762caaedd3383c4d311.html
MSM On the platform AMSS
http://blog.csdn.net/yili_xie/archive/2010/01/04/5129469.aspx