1 files changed, 74 insertions, 0 deletions
diff --git a/usr.sbin/bhyve/ioapic.c b/usr.sbin/bhyve/ioapic.c
new file mode 100644
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+++ b/usr.sbin/bhyve/ioapic.c
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+/*-
+ * Copyright (c) 2014 Advanced Computing Technologies LLC
+ * Written by: John H. Baldwin <jhb@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+
+#include <machine/vmm.h>
+#include <vmmapi.h>
+
+#include "ioapic.h"
+
+/*
+ * Assign PCI INTx interrupts to I/O APIC pins in a round-robin
+ * fashion.  Note that we have no idea what the HPET is using, but the
+ * HPET is also programmable whereas this is intended for hardwired
+ * PCI interrupts.
+ *
+ * This assumes a single I/O APIC where pins >= 16 are permitted for
+ * PCI devices.
+ */
+static int pci_pins;
+
+void
+ioapic_init(struct vmctx *ctx)
+{
+
+	if (vm_ioapic_pincount(ctx, &pci_pins) < 0) {
+		pci_pins = 0;
+		return;
+	}
+
+	/* Ignore the first 16 pins. */
+	if (pci_pins <= 16) {
+		pci_pins = 0;
+		return;
+	}
+	pci_pins -= 16;
+}
+
+int
+ioapic_pci_alloc_irq(void)
+{
+	static int last_pin;
+
+	if (pci_pins == 0)
+		return (-1);
+	return (16 + (last_pin++ % pci_pins));
+}