smp

I am exploring the usage of MONITOR instruction (or the equivalent intrinsic, _mm_monitor ). Although I found literature describing them, I could not find any concrete examples/samples on how to use it. Can anyone share an example of how this instruction/intrinsic would be used in a driver? Essentially, I would like to use it to watch memory ranges. The monitor instruction arms the address monitoring hardware using the address specified in RAX/EAX/AX . Quote from Intel The state of the monitor is used by the instruction mwait . The effective address size used (16, 32 or 64-bit) depends on the

There is an illustration in kernel source Documentation/memory-barriers.txt, like this: CPU 1 CPU 2 ======================= ======================= { B = 7; X = 9; Y = 8; C = &Y } STORE A = 1 STORE B = 2 <write barrier> STORE C = &B LOAD X STORE D = 4 LOAD C (gets &B) LOAD *C (reads B) Without intervention, CPU 2 may perceive the events on CPU 1 in some effectively random order, despite the write barrier issued by CPU 1: +-------+ : : : : | | +------+ +-------+ | Sequence of update | |------>| B=2 |----- --->| Y->8 | | of perception on | | : +------+ \ +-------+ | CPU 2 | CPU 1 | : | A=1 | \ -

In real mode on x86, what instructions would need to be used to run the code on a different processor, in a multiprocessor system? (I'm writing some pre-boot code in assembler that needs to set certain CPU registers, and do this on every CPU in the system, before the actual operating system boots.) So you have a stand-alone (you said "pre-boot") program, like a bootloader, running in real mode? And this is on a PeeCee with the usual BIOS? In that case you have only one CPU running. In order to spin-up the other CPU units an operating system will typically execute what is called the universal