3rd Chapter CORTEX-A8 Processor Programming
1. Introduction to ARM programming
• In the development of embedded systems, the main programming languages currently used are C and assembler. In many places, such as the initialization of hardware system at boot time, including the setting of CPU state, interrupt enable, the setting of the main frequency, as well as the control parameters and initialization of RAM are used in assembly language. Assembly la
Multi-tasking operating systemThe operating system provides a mechanism for the virtual processor, which gives the process an illusion that the process feels like it is monopolizing the CPU. The operating system kernel must pass reasonable process scheduling to ensure this illusion, so that the operating system resources to get the maximum utilization.It is this virtual processor mechanism that allows the o
Stream processor The term first appeared in the eyes of the people also back to December 4, 2006, Nvidia on the day of the official release of the next generation of DX10 graphics 8800GTX, in the technical parameters of the table, do not see the usual use of two parameters: Pixel pipelines ( Pixel rendering pipeline) and vertex pipelines (vertex shading unit), replaced by a term: streaming processor, the Ch
With the processor mapping, you can map the Web request to the correct processor controller. When the request is received, dispatcherservlet the request to the Handlermapping processor map, allowing it to check the request and find an appropriate handlerexecutionchain. This handlerexecutionchain contains a processor co
Thymeleaf is an easy-to-extend library, and most user-oriented features are not built directly into his core, but are packaged and assembled into a collection of functions called dialect (dialects).Due to the Spring-boot indirect type of the main push thymeleaf template, so this article mainly introduces the thymeleaf of some of the extended functions, although the performance of THYMELEAF3 compared to 2 of the increase is very large, but compared to other, there is a little difference.dialect (
Introduction to Processor interceptorsThe processor interceptor for Spring WEB MVC (if no special instructions, the interceptor as described below as the processor interceptor) is similar to the filter filters in the servlet development for preprocessing and post-processing of the processorCommon Application Scenarios
Logging: Log The request information
Security risks caused by improper PHP Session serialization and deserialization processor settingsPHP Session serialization and deserialization Processor
PHP has a variety of built-in processors used to access $ _ SESSION data, which will be serialized and deserialized. The following three commonly used processing formats correspond to three different processing formats:The storage format of the
The detail parameters of the processor, features supported features summed up very complex, want to say it may take a long time, but for ordinary consumers do not need to know so many irrelevant technical indicators, for the mass consumer groups as long as you know which performance is good to help the decision to buy this is enough, So today we say that the mobile version of the processor in the notebook,
ARM processor status
The ARM microprocessor generally has two working states and can be switched between them:
The first type is the arm State. At this time, the processor executes the 32-bit arm command;
The second is the thumb State. At this time, the processor executes the 16-bit half-aligned thumb command.
During the execution of a program, the microprocessor
ARM Processor ModeThere are 7 modes of operation for ARM processors:
L user mode (USER,USR): Normal program execution mode
L Fast Interrupt Mode (FIQ,FIQ): For high-speed data transfer and channel processing
L external Interrupt mode (IRQ,IRQ): for normal interrupt handling
L Privileged Mode (SUPERVISOR,SVE): A protected mode for use by the operating system
L Data Access Abort mode (ABORT,ABT): for virtual storage and storage
Q: Often in newspapers and magazines to see the word dual core processor, what is the dual core meaning? What's the benefit?
A: In simple terms, a dual-core processor is the integration of two CPUs on a single wafer. So what is a dual-core processor? What does the concept behind a dual-core processor mean, in short, a
Co-processorThe coprocessor is used to perform specific processing tasks, such as: The math coprocessor can control digital processing to reduce the burden on the processor. ARM can support up to 16 coprocessors, where CP15 is the most important one.CP15 provides 16 sets of registersAccess CP15 by providing 16 sets of registersOne, coprocessor accessARM microprocessors can support up to 16 coprocessors for various coprocessor operations, and during pr
Processor Scheduling Model and Scheduling Algorithm in OSProcessor Scheduling Model and Scheduling Algorithm in OS
Scheduling level
1.1. Advanced scheduling (long-range scheduling and Job Scheduling)
Function: According to an algorithm, the jobs in the backup queue in the external storage queue are transferred to the memory, and the job is the operation object.
Job: A more extensive concept than a program. It not only contains common programs and data
Do you think it's just a CPU when you lift a phone processor? What, you always think so? Well, boy, it's naïve.
Have you heard of the "core M" processor in the PC field? The processor, which can be plugged into a tablet, laptop or computer, is not a single processor, but is called the "Soc" (on-chip system), and the m
DB2 exception processor is still unfamiliar to many new users who have just been familiar with the DB2 database. Next we will introduce the DB2 exception Processor type for you. I hope it will help you.
DB2 exception Processor type (handler-type) has the following types:
After the processor operation is complete, CON
mode)
5. A streamlined but fast dual-priority interrupt sub-system with a temporary memory group that can be switched
Today, the arm family occupies all 32-bit embeddedProcessor75%, making it the most 32-bit dollar in the worldArchitecture. ArmProcessorFrom portable devices (PDAs, mobile phones, multimedia players, handheld video games, and computers) to computer peripheral devices (hard disks and desktop routers) it even exists in missile-carryi
Beanpostprocessor interface Function:If we want to complete the bean instantiation, configuration, and other initialization methods before and after the spring container, add some of our own logic processing. We need to define one or more Beanpostprocessor interface implementation classes, and then register them in the Spring IOC container. Packagecom.test.spring;Importorg.springframework.beans.BeansException;ImportOrg.springframework.beans.factory.config.BeanPostProcessor;/*** Bean Post
8.3 Configuring processor Properties8.3.1 Viewing the Processor tabSwitch to the Processor tab to view the current processor configuration.650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/6B/80/wKiom1UvMtTja-owAAIz4UpJCyc142.jpg "title=" Processor. png "alt=" wkiom
put a picture firstVery familiar with Ah, have seen before, we have already put handlermapping the bottom of the sky, along with the progress of the last, continue to follow, the Handleradapter processor adapter splitIt is also dispatched by the Central scheduler Dispatcherservlet, so, or in this class to find Dodispatch (Request,response) This method, I put the useful code, stripped downprotected voidDodispatch (httpservletrequest request, httpservle
, conditional variables, counting semaphores, mailboxes, and event flags) required by the embedded system ), it also has flexible scheduling policies and interrupt processing mechanisms, so it has good real-time performance. Compared with the eCos operating system in Embedded Linux, ECOs is more suitable for devices that process real-time signals, such as mobile communication and WLAN communication equipment development.The ECOs kernel scheduling mechanism is shown in the following table:
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