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Cooperative Linux… “A treaty between two OS giants”

Cooperative Linux… “A treaty between two OS giants”. By: Raithatha Yash. Why CoLinux? Introduction History Design Overviews Tools Available Uses Current Status. Planned Features Disadvantages Conclusion References. Content. Why CoLinux?. Problem:

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Cooperative Linux… “A treaty between two OS giants”

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  1. Cooperative Linux…“A treaty between two OS giants” By: Raithatha Yash

  2. Why CoLinux? Introduction History Design Overviews Tools Available Uses Current Status Planned Features Disadvantages Conclusion References Content

  3. Why CoLinux? • Problem: Requirement of GCC for software development • Solution: Install Linux OS on system • New Problem: Booting time extended, Unfamiliar with new OS • Solution: Cooperative Linux

  4. What is CoLinux? • Cooperative Linux, a port of the Linux kernel that allows it to run as an unprivileged lightweight virtual machine in kernel mode, on top of another OS kernel. • Uses the concept of Cooperative Virtual Machine (CVM) • Contains special Windows drivers, which allow it to run under Windows XP as a guest operating system with all privileges. • Superior over other traditional virtualization solutions like VMware, Xen which provides less privileges to guest OS.

  5. History • Dan Aloni originally started the development of Cooperative Linux based on similar work with User-mode Linux. • He open sourced the software under the GNU General Public License. • Other developers have since contributed various patches and additions to the software.

  6. Design Overviews • Device Driver • The device driver port of Cooperative Linux is used for accessing kernel mode . • Interfaces with OS dependent primitives Like page allocations, debug printing, and interfacing with user space. • Driver loads a kernel image from a vmlinux file.

  7. Design Overviews (cont...) • Pseudo Physical RAM • All the memory which CoLinux considers as physical in the allocated set is called Pseudo Physical RAM (PPRAM). • Allocated pages are always resident and not freed until the VM is downed. • Page tablesare created for mapping pages in the VM’s kernel virtual address space. • The VM’s address space resembles the address space of a regular kernel.

  8. Design Overviews (cont...) • Context Switching • The Cooperative Linux VM uses only one host OS process in order to provide a context for itself and its processes, viz. colinux-daemon . • CoLinux is able to completely control the CPU and MMU without affecting anything else in the host OS kernel. • Uses an intermediate address space during switching

  9. Address space transition during an OS cooperative kernel switch, using an intermapped page

  10. Design Overviews (cont...) • Interrupt Handling and Forwarding Cooperative Linux only forwards the invocations of interrupts to the host OS in order to keep functioning and support the coLinux-daemon process itself, regardless to the fact that external hardware interrupts are meaningless to the Cooperative Linux virtual machine.

  11. Tools Available • Original GNU tools for compiling C/C++ programs and corresponding libraries • Open source editor PN (Programmers Notepad) • TFTP server for file transfer • Telnet Client

  12. CoLinux Configuration • kernel=vmlinux specifies the kernel to be used. • initrd=initrd.gz is the initial ram disk • mem=120 is the system virtual memory • cobd0=root.img specify partition /dev/cobd0 to point to root.img • cobd1=swap.img specify partition /dev/cobd1 to point to swap.img • eth0=slirp set up an ethernet connection using the windows host. • root=/dev/cobd0 specify the mounted root file system.

  13. Uses • Relatively effortless migration path from Windows. • Adding Windows machines to Linux clusters. • Using Linux as a Windows firewall on the same machine. • Linux kernel development, debugging, research and study on another operating systems.

  14. Current Features • Version: 0.6.4 • Released on date: July 02, 2006 • Supported architectures: • Intel-compatible 386 and above • Supported operating systems: • Windows 2000 • Windows XP • Linux 2.6.x • Supported guest Linux kernel versions: • 2.6.11

  15. Planned Features • Suspension • User Mode Linux inside Cooperative Linux • Live Cooperative Distributions • Integration with ReactOS. • Virtual frame buffer support. • Support for more host operating systems such as FreeBSD.

  16. Disadvantages • CoLinux runs aside the Windows kernel on the same hardware abstraction layer • A problem in the Linux kernel can bring the Windows kernel down • Uses two different IP address for windows and Colinux. • Also to load and use coLinux the user has to have administrator rights.

  17. Conclusion • The colinux is an economical and efficient possibility to program embedded Linux systems directly from a Windows PC. • As user friendliness of the Windows port will improve, the exposure that Linux gets by the average computer user can increase tremendously.

  18. References • Web references: • www.colinux.org • www.sourceforge.net/projets/coLinux • www.dilnetpc.com • www.en.wikipedia.org/wiki/colinux • www.hesperia.gsfc.nasa.gov/colinux • www.user-mode-linux.sf.net • www.google.co.in • Book references: • Donald E. Knuth. The Art of Computer Programming, volume 1.

  19. Thank You! Queries?

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