Margaret Bloom

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Margaret Bloom has asked 20 questions and find answers to 128 problems.

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Margaret Bloom questions

Why is this specpoline not working on Kaby lake?
What are the microarchitectural details behind MSBDS (Fallout)?
How does the indexing of the Ice Lake's 48KiB L1 data cache work?
What does the PCOMMIT instruction do?
Can the LSD issue uOPs from the next iteration of the detected loop?
Can the A20 line still be masked off on Haswell and successors?
Why flush the pipeline for Memory Order Violation caused by other logical processors?
How are MMIO, IO and PCI configuration request routed and handled by the OS in a NUMA system?
Understanding the impact of lfence on a loop with two long dependency chains, for increasing lengths
C standard compliant way to access null pointer address?

Margaret Bloom answers

(NASM) (80x86) Bootloader NEEDS xor ax, ax
Questions about APIC interrupt
What happens when you execute an instruction that your CPU does not support?
Difference between .section .text and .text with gas
Is it possible to use VMX CPU instructions inside VM?
Returning a struct in SystemV ABI
Why does Windows use RCX, RDX for pointers in a fresh x64 process, different from EAX, EBX in a newly created 32-bit process?
How does perf use the offcore events?
What does `__meminit` mean in Linux Kernel?
MIPS pipeline stages - what happens when an instruction doesn't need a stage, like MEM for ALU instructions?