On 2011-10-02 21:07, Avi Kivity wrote: >>> >>> The way to fix it is two-phase reset: >>> >>> phase 1: reset internal state (-> move all outputs to reset >>> values), >>> don't sample inputs yet >>> phase 2: allow sampling inputs >> >> As far as I understood Anthony's QOM plans, phase 1 will correspond >> to >> "unrealize", phase 2 to "realize". > > That smells of abusing mechanism used for construction for reset purposes. > > Why not use an ordinary qemu_irq? It reresents a pin; 0->1 edge (assert) > enters phase 1, 1->0 edge (deassert) enters phase 2. Exactly like real > hardware.
QEMU makes no difference between power-on reset and system reset right now. At least I am not aware of any device model that has problems with this. Thus there is apparently no need to treat reset and create differently. As QOM requires a two-phase device creation anyway (to let properties to "settle"), it looks like there is some reuse potential. Jan
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