EmbLogic » Aswani

Memory management

Aswani — Mon, 24 Mar 2014 06:12:08 +0000

Memory management is the most important parts of the operating system.early days of computing, there has been a need for more memory than exists physically in a system.Virtual memory makes the system appear to have more memory than it actually has by sharing it between competing processes as they need it.

The operating system makes the system appear as if it has a larger amount of memory than it actually has. The virtual memory can be many times larger than the physical memory in the system.
Each process in the system has its own virtual address space. These virtual address spaces are completely separate from each other and so a process running one application cannot affect another. Also, the hardware virtual memory mechanisms allow areas of memory to be protected against writing. This protects code and data from being overwritten by rogue applications.

character driver

Aswani — Sun, 23 Mar 2014 13:30:56 +0000

Successfully implemented all synchronization techniques.
now implementing ioctl.

Character Device Driver

Aswani — Mon, 03 Mar 2014 17:52:18 +0000

Presently i am implementing character device driver,there are short description of my work on driver till now.
>1st initialize the character driver by allocating memory on physical memory by registering in the kernel as a kernel module.
>And extracting major & minor number,with the help of this number, create NOD between the user sapce and kernel space
>After that performed file oprations:
@ with help of NOD open the file then write in kernel space from user space and read that same again in user space from kernel sapce.then close operation performed.
>Same file operation performed for the more memory by creating multiple SCULLQSET.(Ongoing)
>lseek which is a system call that is used to change the location of the read/write pointer of a file descriptor. The location can be set either in absolute or relative terms.(not working correctly)

Character_driver :read operation

Aswani — Sat, 01 Mar 2014 16:55:54 +0000

I am implemented successfully read operation from kernel space to user space with and without using lseek machanism.

Character_device driver : Implemented upto write opertion.

Aswani — Wed, 26 Feb 2014 07:49:11 +0000

I am implemented successfully write operation in multiple quantum in kernel space from user space .

Now i am implementing reading operation in user space from kernel space.

Aswani — Mon, 24 Jun 2013 07:28:40 +0000

finally implemented ftp server…..