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It also facilitates the building of complex multi-step instructions, while reducing the complexity of computer circuits.
Writing microcode is often called microprogramming and the microcode in a particular processor implementation is sometimes called a microprogram.
The document by Fenghua Yu describes how microcode can be loaded by the kernel. The kernel is described as a mechanism for loading the microcode. Hence "kernel microcode" is not a valid [email protected], you are probably right about the term. I'm not sure what you call the facility inside the CPU that "executes" microcode, and I believe microcode in Intel/AMD CPUs may control things other than microcoded instructions.
It's something that can be updated, but it needs to be applied each reboot.
C.50(rw,async,no_root_squash) Dom U's fstab: /dev/nfs / nfs rw 0 0 proc /proc proc defaults 0 0 sysfs /sys sysfs noauto 0 0 debugfs /sys/kernel/debug debugfs noauto 0 0 devpts /dev/pts devpts mode=0620,gid=5 0 0 Dom U's configuration: memory = 256 vcpus = 1 builder = 'linux' name = 'vm2' vif = [ 'mac=:3e:63:4a:fe,ip=A. C.50' ] localtime = 1 on_poweroff = 'destroy' on_reboot = 'restart' on_crash = 'restart' extra = ' 3 TERM=xterm' kernel = "/boot/vmlinuz-xen" ramdisk = "/boot/initrd-xen" root = "/dev/nfs" nfs_server = 'A. C.107' nfs_root = '/vm' netmask = '255.255.255.0' gateway = 'A.
rm: cannot remove `/var/run/hal/haldaemon.pid': Read-only file system Starting HAL daemon/usr/sbin/hald: error while loading shared libraries: libgobject-2.00: cannot open shared object file: No such file or directory startproc: exit status of parent of /usr/sbin/hald: 127 failed Loading CPUFreq modules (CPUFreq not supported) Setting up network interfaces: lo lo IP address: 127.0.0.1/8 done eth0 eth0 configuration: eth-id-:3e:63:4a:fe eth0 IP address: A.
More extensive microcoding allows small and simple microarchitectures to emulate more powerful architectures with wider word length, more execution units and so on, which is a relatively simple way to achieve software compatibility between different products in a processor family.
Some hardware vendors, especially IBM, use the term microcode as a synonym for firmware.
Microcode is used in general-purpose central processing units, as well as in more specialized processors such as microcontrollers, digital signal processors, channel controllers, disk controllers, network interface controllers, network processors, graphics processing units, and in other hardware.
Anyway, sometimes Intel/AMD releases a "microcode update" which corrects some flaws or disables instructions that are unreliable.
So generally you want the latest microcode update installed on a CPU before you really use it.
Today after unpacking the initramfs file from my Linux /boot directory I found that it contains the Genuine file, and that that file is an image of what is called the CPU microcode.
Then I found articles on Arch Wiki and Wikipedia describing the subject.