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Some platforms are not GICv4 compatible, therefore we need to make sure the stride between redistributors is configurable: 2 frames of 64KiB for GICv3 => a stride of 128KiB 4 frames of 64KiB for GICv4 => a stride of 256KiB We detect this at runtime by reading the GICD_PIDR2.ArchRev bitfield This is 3 for GICv3 and 4 for GICv4. Note: other software projects [1] rely on a different check, mainly reading the GICR_TYPER.VLPIS bit We diverge from this behaviour as VLPIS are not implemented and we do not want to incorrectly report this to the probing software. We should move to VLPIS once they get implemented [1]: https://github.com/torvalds/linux/blob/\ 107c948d1d3e61d10aee9d0f7c3d81bbee9842af/\ drivers/irqchip/irq-gic-v3.c#L864 Change-Id: I7cc554f48cc6a347c03ed80cf2ea320f618a59c2 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59394 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com> Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>