[coreboot] LOCK prefix

[ron minnich]

Somewhere in the back of my memory is buried the idea that you can do this:

LOCK mov a, %ax
LOCK add $1, %ax
LOCK mov %ax, a

I.e implement a compound indivisible instruction with a sequence of
instructions prefixed with LOCK.

Notwithstanding the merits of the idea, does anyone know if this is doable
or I am just misremembering?

ron
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