hw/arm_boot, exynos4210, highbank: Fix secondary boot GIC init
Fix the code in the secondary CPU boot stubs so that it correctly initialises the GIC rather than relying on bugs or implementation dependent aspects of the QEMU GIC implementation: * set the GIC_PMR.Priority field to all-ones, so that all interrupts are passed through. The default of all-zeroes means all interrupts are masked, and QEMU only booted because of a bug in the priority masking in our GIC implementation. * add a barrier after GIC setup and before WFI to ensure that GIC config is complete before we go into a possible low power state. This isn't needed with the software GIC model but could be required when using KVM and executing this code on the real hardware CPU. Note that of the three secondary stub implementations, only the common generic one needs to support both v6 and v7 DSB encodings; highbank and exynos4210 will always be v7 CPUs. Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NIgor Mitsyanko <i.mitsyanko@samsung.com>
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