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--- /home/adsharma/disk2/xen-ia64/xeno-unstable-rebase.bk/xen/../../linux-2.6.11/arch/ia64/kernel/irq_ia64.c 2005-03-01 23:38:07.000000000 -0800
+++ /home/adsharma/disk2/xen-ia64/xeno-unstable-rebase.bk/xen/arch/ia64/irq_ia64.c 2005-05-18 12:40:51.000000000 -0700
@@ -106,6 +106,9 @@
unsigned long saved_tpr;
#if IRQ_DEBUG
+#ifdef XEN
+ xen_debug_irq(vector, regs);
+#endif
{
unsigned long bsp, sp;
@@ -148,6 +151,9 @@
ia64_setreg(_IA64_REG_CR_TPR, vector);
ia64_srlz_d();
+#ifdef XEN
+ if (!xen_do_IRQ(vector))
+#endif
__do_IRQ(local_vector_to_irq(vector), regs);
/*
@@ -167,6 +173,95 @@
irq_exit();
}
+#ifdef CONFIG_VTI
+/*
+ * That's where the IVT branches when we get an external
+ * interrupt. This branches to the correct hardware IRQ handler via
+ * function ptr.
+ */
+void
+vmx_ia64_handle_irq (ia64_vector vector, struct pt_regs *regs)
+{
+ unsigned long saved_tpr;
+ int wake_dom0 = 0;
+
+
+#if IRQ_DEBUG
+ {
+ unsigned long bsp, sp;
+
+ /*
+ * Note: if the interrupt happened while executing in
+ * the context switch routine (ia64_switch_to), we may
+ * get a spurious stack overflow here. This is
+ * because the register and the memory stack are not
+ * switched atomically.
+ */
+ bsp = ia64_getreg(_IA64_REG_AR_BSP);
+ sp = ia64_getreg(_IA64_REG_AR_SP);
+
+ if ((sp - bsp) < 1024) {
+ static unsigned char count;
+ static long last_time;
+
+ if (jiffies - last_time > 5*HZ)
+ count = 0;
+ if (++count < 5) {
+ last_time = jiffies;
+ printk("ia64_handle_irq: DANGER: less than "
+ "1KB of free stack space!!\n"
+ "(bsp=0x%lx, sp=%lx)\n", bsp, sp);
+ }
+ }
+ }
+#endif /* IRQ_DEBUG */
+
+ /*
+ * Always set TPR to limit maximum interrupt nesting depth to
+ * 16 (without this, it would be ~240, which could easily lead
+ * to kernel stack overflows).
+ */
+ irq_enter();
+ saved_tpr = ia64_getreg(_IA64_REG_CR_TPR);
+ ia64_srlz_d();
+ while (vector != IA64_SPURIOUS_INT_VECTOR) {
+ if (!IS_RESCHEDULE(vector)) {
+ ia64_setreg(_IA64_REG_CR_TPR, vector);
+ ia64_srlz_d();
+
+ if (vector != IA64_TIMER_VECTOR) {
+ /* FIXME: Leave IRQ re-route later */
+ vmx_vcpu_pend_interrupt(dom0->vcpu[0],vector);
+ wake_dom0 = 1;
+ }
+ else { // FIXME: Handle Timer only now
+ __do_IRQ(local_vector_to_irq(vector), regs);
+ }
+
+ /*
+ * Disable interrupts and send EOI:
+ */
+ local_irq_disable();
+ ia64_setreg(_IA64_REG_CR_TPR, saved_tpr);
+ }
+ else {
+ printf("Oops: RESCHEDULE IPI absorbed by HV\n");
+ }
+ ia64_eoi();
+ vector = ia64_get_ivr();
+ }
+ /*
+ * This must be done *after* the ia64_eoi(). For example, the keyboard softirq
+ * handler needs to be able to wait for further keyboard interrupts, which can't
+ * come through until ia64_eoi() has been done.
+ */
+ irq_exit();
+ if ( wake_dom0 && current != dom0 )
+ domain_wake(dom0->vcpu[0]);
+}
+#endif
+
+
#ifdef CONFIG_HOTPLUG_CPU
/*
* This function emulates a interrupt processing when a cpu is about to be
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