[Xen-ia64-devel] [PATCH 20/27] ia64/pv_ops/xen: implement xen pv_iosapic_ops.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

implement xen pv_iosapic_ops for xen paravirtualized
iosapic.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch/ia64/xen/xen_pv_ops.c |   52 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 52 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/xen/xen_pv_ops.c b/arch/ia64/xen/xen_pv_ops.c
index 1ba4617..6978131 100644
--- a/arch/ia64/xen/xen_pv_ops.c
+++ b/arch/ia64/xen/xen_pv_ops.c
@@ -292,6 +292,57 @@ const struct pv_cpu_asm_switch xen_cpu_asm_switch = {
 };
 
 /***************************************************************************
+ * pv_iosapic_ops
+ * iosapic read/write hooks.
+ */
+static void
+xen_pcat_compat_init(void)
+{
+       /* nothing */
+}
+
+static struct irq_chip*
+xen_iosapic_get_irq_chip(unsigned long trigger)
+{
+       return NULL;
+}
+
+static unsigned int
+xen_iosapic_read(char __iomem *iosapic, unsigned int reg)
+{
+       struct physdev_apic apic_op;
+       int ret;
+
+       apic_op.apic_physbase = (unsigned long)iosapic -
+                                       __IA64_UNCACHED_OFFSET;
+       apic_op.reg = reg;
+       ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op);
+       if (ret)
+               return ret;
+       return apic_op.value;
+}
+
+static void
+xen_iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
+{
+       struct physdev_apic apic_op;
+
+       apic_op.apic_physbase = (unsigned long)iosapic -
+                                       __IA64_UNCACHED_OFFSET;
+       apic_op.reg = reg;
+       apic_op.value = val;
+       HYPERVISOR_physdev_op(PHYSDEVOP_apic_write, &apic_op);
+}
+
+static const struct pv_iosapic_ops xen_iosapic_ops __initdata = {
+       .pcat_compat_init = xen_pcat_compat_init,
+       .get_irq_chip = xen_iosapic_get_irq_chip,
+
+       .__read = xen_iosapic_read,
+       .__write = xen_iosapic_write,
+};
+
+/***************************************************************************
  * pv_ops initialization
  */
 
@@ -302,6 +353,7 @@ xen_setup_pv_ops(void)
        pv_info = xen_info;
        pv_init_ops = xen_init_ops;
        pv_cpu_ops = xen_cpu_ops;
+       pv_iosapic_ops = xen_iosapic_ops;
 
        paravirt_cpu_asm_init(&xen_cpu_asm_switch);
 }
-- 
1.5.3


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