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A comment on Ask HN: x86 SMP with cpus on different processor modes. Parent comment

Re:Ask HN: x86 SMP with cpus on different processor modes by i4k on Sunday October 30, 2016 @02:00PM (#12831182)
I'd already read the booting process of xv6, but it does IPI in protected mode too. Maybe BSP will need to enter pmode to make any IPI call anyway.

Thanks for the help!

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