Does anyone know if on ARMv5, it's valid to modify the first-level translation table in memory after the MMU has been enabled? Trying to work out if I can pre-decode the translation table for speed on changes to Translation Table Base Register. @aaronsgiles ?
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Surely it is possible, but you need to do an explicit tlb invalidation and probably an isb/dsb before it becomes live.
It looks like in MAME's current ARM7 implementation, there is no implementation of either TLB invalidation or isb/dsb, and we'd fatalerror if something used it. So for what we currently run, I'd wager it would be safe to pre-decode the page table. Sound about right?
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ARMv5, that is, not ARM7. arm7_cpu_device is increasingly a misnomer.
Kiitos. Käytämme tätä aikajanasi parantamiseen. KumoaKumoa
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Sure. The invalidation ops are CP15 operations if you're looking for them. You'd ideally decode into a virtual tlb so that in the future you could leverage the logic contained therein to manage invalidation and other details.
Kiitos. Käytämme tätä aikajanasi parantamiseen. KumoaKumoa
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