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Qubit and Inter-Process Communication

Sat, May 6, 2017

One of the most important tasks of the kernel, in a client-server model, is to provide a means for clients and servers to send and receive messages. Clients need to be able to talk to servers, servers need to be able to talk back to clients, and servers need to talk to servers.

I. Communication Mechanisms

There are four parts to this communication infrastructure:

1. Ports

When a process that wants to be a server is created, it requests a port number from the kernel. Ports are the endpoints where clients and servers send their messages, kind of like a mailbox address. Each port has its own queue of messages being sent to, or returned by, the server.

Qubit OS and bootloaders

Sun, Jan 22, 2017

When the computer is powered up, after the initial hardware scan and gathering, the BIOS then checks which device contains the boot information. This could be a floppy disk, CD-ROM, or typically, the primary hard drive. The first sector (bootsector) is read. The small program in this area reads a partition table that is kept at the end of the sector. This table has all of the hard drives, their partitions, and their purpose, listed. The one it looks for, specifically, is the one designated as the boot partition. Then, this little program turns over control to another program, called the bootloader, loading it from that boot partition and subsequently running it.

Operating System basics

Mon, Oct 10, 2016

The Operating System (OS) is the software that pulls together all of the hardware components, processors, disks, memory, etc., into a cohesive interface for all users and programs to use. The kernel is the name for the core of the operating system: the program that handles all the software-components controlling the hardware.

Things that the kernel implements are considered to be in kernel space. Everything else, outside of the kernel, is considered user space, and is where software that uses the kernel’s interface runs (managing files, graphical interface, games, word processing, etc).

Qubit

Thu, Jan 20, 2011
Qubit is an POSIX-compliant Operating System that uses a microkernel organization, therefore it has a very small kernel footprint and all drivers reside in usermode processes. Requirements Intel 386sx(or compatible) CPU and up. minimum of 16Mb of RAM. IDE or SCSI disk formatted with FAT(12/16/32). Hardware support IDE drives ST 506. Floppy drives (360k, 720k, 1.44Mb and 2.88Mb). Mouses (Microsoft bus, Logitech bus, IBM serial and PS/2).