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Intel virtualisation: how VT-x, KVM and QEMU work together
VT-x is name of CPU virtualisation technology by Intel. KVM is component of Linux kernel which makes use of VT-x. And QEMU is a user-space application which allows users to create virtual machines. QEMU makes use of KVM to achieve efficient virtualisation. In this article we will talk about how (...)

What's a CPU to do when it has nothing to do?
It would be reasonable to expect doing nothing to be an easy, simple task for a kernel, but it isn't. At Kernel Recipes 2018, Rafael Wysocki discussed what CPUs do when they don't have anything to do, how the kernel handles this, problems inherent in the current strategy, and how his recent (...)

A Commodore 64 operating system with modern concepts
C64 OS has one goal. Make a Commodore 64 feel fast and useful in today's modern world. It's a very high bar. The C64 was introduced in 1982 and has an 8-bit, 1MHz, 6510 CPU with just 64 kilobytes of directly addressable memory. It has a screen resolution of 320x200 pixels, and a fixed palette (...)

The MRISC32: a vector-first CPU design
In essence, it's a 32-bit RISC ISA designed from a holistic view on integer, floating point, scalar and vector operations. In addition there is a hardware implementation of a single issue, in order, pipelined CPU. The hardware implementation mostly serves as an aid in the design of the ISA (at (...)
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