[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 3/7] xen/arm: Initialize correctly IRQ routing
On Fri, 2013-08-30 at 14:30 +0100, Julien Grall wrote: > When Xen initialize the GIC distributor, we need to route all the IRQs to > the boot CPU. The CPU ID can differ between Xen and the GIC. > > When ITARGETSR0 is read, each field will return a value that corresponds > only to the processor reading the register. This trick is used a few times in this series, is it really the best way to figure this out? Not in some ID register or in DT? > So Xen can use the PPI 0 to > initialize correctly the routing. > > Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx> > --- > xen/arch/arm/gic.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c > index 37a73fb..cadc258 100644 > --- a/xen/arch/arm/gic.c > +++ b/xen/arch/arm/gic.c > @@ -275,9 +275,10 @@ void gic_route_dt_irq(const struct dt_irq *irq, const > cpumask_t *cpu_mask, > static void __init gic_dist_init(void) > { > uint32_t type; > - uint32_t cpumask = 1 << smp_processor_id(); > + uint32_t cpumask; > int i; > > + cpumask = GICD[GICD_ITARGETSR] & 0xff; > cpumask |= cpumask << 8; > cpumask |= cpumask << 16; > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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