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[Driver Develop] mm-dram DL : 0: This module implements a Linux character-mode device-driver for the processor s installed physical memory. It utilizes the kernel s kmap() function, as a uniform way to provide access to all the memory-zones (including the "high memory" on systems with more than 896MB of installed physical ram). The access here is read-only because we deem it too risky to the stable functioning of our system to allow every user the unrestricted ability to arbitrarily modify memory-areas which might contain some "critical" kernel data-structures. We implement an llseek() method so that users can readily find out how much physical processor-memory is installed. -This module implements a Linux character-mode device-driver for the processor s installed physical memory. It utilizes the kernel s kmap() function, as a uniform way to provide access to all the memory-zones (including the "high memory" on systems with more than 896MB of installed physical ram). The access here is read-only because we deem it too risky to the stable functioning of our system to allow every user the unrestricted ability to arbitrarily modify memory-areas which might contain some "critical" kernel data-structures. We implement an llseek() method so that users can readily find out how much physical processor-memory is installed.
Date : 2025-12-29 Size : 8kb User : jeevan
[Driver Develop] Chap12 DL : 0: End user convenience is the keynote of the universal serial bus (USB). The Plug and Play (PnP) concept has simplified the process of installing certain types of hardware on existing PCs. However, configuration issues continue to plague end users with respect to legacy devices such as serial and parallel ports, keyboards, and mice. Port availability is one of the factors that have historically limited proliferation of peripherals, including modems, answering machines, scanners, and personal digital assistants. USB helps solve these problems by providing a uniform method of connecting a potentially large number of self-identifying devices through a single PC port.
Date : 2025-12-29 Size : 1.09mb User : Nick