Margaret Bloom

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Margaret Bloom has asked 20 questions and find answers to 135 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

x86 processor assembly language AND and OR operator precedence
`TYPE` but then in NASM
Handling x86 IRQs from secondary PIC: EOI order important?
How to break down a NASM application into modules/packages and include them?
Does context switch between processes invalidate the MMU(memory control unit)?
How does comparing the Sign and Overflow Flag determine operand relationships?
(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