Year: 2025

Remote Control Key Mapping for Android Devices: A Comprehensive Guide from Low-Level Drivers to Application Layer

by
Remote Control Key Mapping for Android Devices: A Comprehensive Guide from Low-Level Drivers to Application Layer

🔍 Why is Remote Control Key Mapping Necessary? In scenarios such as smart TVs, set-top boxes, and in-vehicle devices, remote controls are core interaction tools. However, the differences in remote control protocols and key definitions among different manufacturers can be significant. Without proper mapping, key events may not be correctly transmitted to the application layer, … Read more

The Driving Logic Behind the Value Upgrade of Entertainment Devices: From Functional Supply to Lifestyle Scenarios

by
The Driving Logic Behind the Value Upgrade of Entertainment Devices: From Functional Supply to Lifestyle Scenarios

The differentiation and reconstruction of contemporary lifestyles are profoundly driving the entertainment device industry to transition from “functional supply” to “scenario ecology.” As the “immersive experience” of home scenarios and the “mobile recording” of outdoor scenarios become new consumer favorites, devices such as projectors, speakers, and action cameras have transcended their tool attributes, becoming vivid … Read more

Introduction to Linux Character Device Drivers (Part 0) – Overview of Linux Drivers

by
Introduction to Linux Character Device Drivers (Part 0) - Overview of Linux Drivers

Video Collection (Introduction to Linux Character Device Drivers) 1 Linux Kernel Source Website www.kernel.org 2 Types of Drivers a Character Drivers b Block Drivers c Network Drivers 3 System Boot Process 1 U-Boot Boot 2 Kernel Boot 3 File System Boot 4 Differences Between Static and Dynamic Driver Loading: 1 Different Compilation Options y Driver … Read more

Windows PCI Device Driver Development Guide: Using SGL DMA

by
Windows PCI Device Driver Development Guide: Using SGL DMA

In the previous article (Implementing a PCIe Device in Qemu: Supporting SGL DMA), we added a Bit Flip functionality (bitwise negation) to the PCIe device simulated in Qemu. In this functionality, we implemented support for Scatter-Gather List DMA (SGL DMA), allowing the use of non-contiguous physical memory as a DMA buffer. This article will introduce … Read more

Windows PCI Device Driver Development Guide: Supporting Function Level Reset (FLR)

by
Windows PCI Device Driver Development Guide: Supporting Function Level Reset (FLR)

In the previous article (Implementing a PCIe Device in Qemu: Implementing Function Level Reset (FLR)), we added the FLR functionality to the PCIe device simulated in Qemu and triggered the reset operation of the device by writing to the PCIe configuration space using windbg. However, the FLR triggered by manually writing to the configuration space … Read more

Analysis of Answer to Checkpoint 10.3 in Assembly Language

by
Analysis of Answer to Checkpoint 10.3 in Assembly Language

“Assembly Language”, 3rd Edition by Wang Shuang Chapter 10: CALL and RET Instructions Checkpoint 10.3 (Page 193) What is the value in ax after executing the following program? Memory Address Machine Code Assembly Instruction 1000:0 b8 00 00 mov ax, 0 1000:3 9A 09 00 00 10 call far ptr s 1000:8 40 inc ax … Read more

Fundamentals of Assembly Language Security Techniques

by
Fundamentals of Assembly Language Security Techniques

Overview of Traditional Security Techniques This section will introduce some traditional, fundamental yet effective assembly language security techniques, rather than cutting-edge rootkits or virus/antivirus technologies. This foundational knowledge is crucial for understanding modern security mechanisms. Basic Concepts of Viruses and Trojans In the realm of traditional security, the distinctions between viruses and trojans are as … Read more

Explaining Assembly Language Technology: Principles of Integrity Verification Based on Hash Algorithms

by
Explaining Assembly Language Technology: Principles of Integrity Verification Based on Hash Algorithms

Application of Hash Algorithms in Security Hash algorithms are the core technology for verifying file integrity, where the fundamental principle is to compute a fixed-length digest value (such as MD5) from the file content to establish a “digital fingerprint” of the file. This section will detail how to implement an integrity verification mechanism based on … Read more

Assembly Language: Chapter 4 – The First Complete Assembly Program

by
Assembly Language: Chapter 4 - The First Complete Assembly Program

This series will explain the book “Assembly Language”. This section covers Chapter 4 – The First Complete Assembly Program. We can finally write our first complete program. Previously, we were writing some instructions in Debug and executing them there. Now we will start writing a complete assembly language program, using <span>compilation</span> and <span>linking</span> to compile … Read more