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

Re:Ask HN: x86 SMP with cpus on different processor modes by sinatosk on Sunday October 30, 2016 @01:04PM (#12830851)
I ain't an expert in x86 so I'm not sure... only read some of Intel's manual but judging by the code at

https://github.com/mit-pdos/xv6-public

file "entryother.S" is asm that executes on AP's and "bootasm.S" executes on the BSP... both after the BIOS

so... maybe?

maybe that's what your looking for?

[ Parent | on HN ]
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!

[ Parent | on HN ]