1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2014 Hudson River Trading LLC
5 * Written by: John H. Baldwin <jhb@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/types.h>
31 #include <stdio.h>
32
33 #include <machine/vmm.h>
34 #include <vmmapi.h>
35
36 #include "bootrom.h"
37 #include "ioapic.h"
38 #include "pci_emul.h"
39 #include "pci_lpc.h"
40
41 /*
42 * Assign PCI INTx interrupts to I/O APIC pins in a round-robin
43 * fashion. Note that we have no idea what the HPET is using, but the
44 * HPET is also programmable whereas this is intended for hardwired
45 * PCI interrupts.
46 *
47 * This assumes a single I/O APIC where pins >= 16 are permitted for
48 * PCI devices.
49 */
50 static int pci_pins;
51
52 void
ioapic_init(struct vmctx * ctx)53 ioapic_init(struct vmctx *ctx)
54 {
55
56 if (vm_ioapic_pincount(ctx, &pci_pins) < 0) {
57 pci_pins = 0;
58 return;
59 }
60
61 /* Ignore the first 16 pins. */
62 if (pci_pins <= 16) {
63 pci_pins = 0;
64 return;
65 }
66 pci_pins -= 16;
67 }
68
69 int
ioapic_pci_alloc_irq(struct pci_devinst * pi)70 ioapic_pci_alloc_irq(struct pci_devinst *pi)
71 {
72 static int last_pin;
73
74 if (pci_pins == 0)
75 return (-1);
76 if (bootrom_boot()) {
77 /* For external bootrom use fixed mapping. */
78 return (16 + (4 + pi->pi_slot + pi->pi_lintr.pin) % 8);
79 }
80 return (16 + (last_pin++ % pci_pins));
81 }
82