From: Tim Deegan <tim@xen.org>
Date: Tue, 13 Mar 2012 15:10:53 +0000 (+0000)
Subject: arm: Add a comment explaining the GICD writes in the GICC init function
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=139692dee47dbc35b9a646a9bafde2bca3cd4e6e;p=xen.git

arm: Add a comment explaining the GICD writes in the GICC init function

Signed-off-by: Tim Deegan <tim@xen.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
---

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index adc10bbe2f..1ff445810a 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -224,7 +224,9 @@ static void __cpuinit gic_cpu_init(void)
 {
     int i;
 
-    /* Disable all PPI and enable all SGI */
+    /* The first 32 interrupts (PPI and SGI) are banked per-cpu, so 
+     * even though they are controlled with GICD registers, they must 
+     * be set up here with the other per-cpu state. */
     GICD[GICD_ICENABLER] = 0xffff0000; /* Disable all PPI */
     GICD[GICD_ISENABLER] = 0x0000ffff; /* Enable all SGI */
     /* Set PPI and SGI priorities */