Pre-os and runtime sub-os functionality, Computer Engineering

Assignment Help:

In a raw Itanium, a "Processor Abstraction Layer" (PAL) is integrated into the system. When it is booted the PAL is loaded into the CPU and gives a low-level interface that abstracts some instructions and gives a mechanism for processor updates distributed via a BIOS update.

During BIOS initialization an additional layer of code, the "System Abstraction Layer" (SAL) is loaded that gives a uniform API for execution-specific platform functions.

On top of the PAL/SAL interface sits the "Extensible Firmware Interface" (EFI). EFI is not part of the IA-64 architecture but by convention it is needed on all IA-64 systems. It is a easy API for access to logical aspects of the system (display, storage, keyboard, etc) combined with a lightweight runtime environment (same to DOS) that allows basic system administration tasks such as configuring storage adapters, flashing BIOS and running an OS boot-loader.

Once the OS has been booted, some aspects of the PAL/SAL/EFI stack remain resident in memory and can be accessed by the OS to perform low-level tasks that are implementation-dependent on the underlying hardware.


Related Discussions:- Pre-os and runtime sub-os functionality

Show various RISC processors, Q. Show Various RISC Processors? RISC has...

Q. Show Various RISC Processors? RISC has fewer design bugs and its simple instructions decrease design time. Sodue to all the above important reasons RISC processors have beco

Explain about encoding technique used in bitmaps indexes, Bitmaps commonly ...

Bitmaps commonly use one bitmap for each single distinct value. Number of bitmaps used can be decreased by opting for a dissimilar type of encoding. Space can be optimized but when

Task of the computer systems consultant, You are required to carry out the ...

You are required to carry out the task of the Computer Systems Consultant mentioned above. Your quotation/recommendations, which must be justified, should include information wi

How many instructions in a computer, Q. How many instructions in a Computer...

Q. How many instructions in a Computer? A computer can have a vast number of instructions and addressing modes. Older computers with the growth of Integrated circuit technolog

How enterprises are using bpr in their e-business processes, One of the mos...

One of the most important competitive strategies for E-Businesses today is business process reengineering. BPR is more than automating business processes to make modest improvement

Define rom, Define ROM? It is a non-volatile memory. It includes only r...

Define ROM? It is a non-volatile memory. It includes only reading of stored data.

What is the maximum frequency of operation, For the circuit demonstrated be...

For the circuit demonstrated below, what is the Maximum Frequency of Operation? Are there any hold time violations for FF2? When yes, how do you modify the circuit to ignore them?

Io devices and i/o subsystem and direct memory access, Why IO devices canno...

Why IO devices cannot be connected directly to the system bus? Ans: The IO devices can't be directly connected to the system bus because the following reason A) The data tra

Explain magnetic read and write mechanisms, Q. Explain Magnetic Read and Wr...

Q. Explain Magnetic Read and Write Mechanisms? Data are recorded on and then retrieved from disk via a conducting coil called the head. In numerous systems there are two heads,

Cryptography, 1. Consider the one-time pad encryption scheme to encrypt a 1...

1. Consider the one-time pad encryption scheme to encrypt a 1-bit message m, and assume m is chosen with uniform distribution from message space M={0,1}. Let E1 be the event "messa

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd