ia64/pv_ops/xen: implement xen pv_iosapic_ops.

implement xen pv_iosapic_ops for xen paravirtualized
iosapic.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

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 5b23cd5e9153..41a6cbfab150 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);
 }