1*bf21cd93STycho Nightingale /*- 2*bf21cd93STycho Nightingale * Copyright (c) 2014 Advanced Computing Technologies LLC 3*bf21cd93STycho Nightingale * Written by: John H. Baldwin <jhb@FreeBSD.org> 4*bf21cd93STycho Nightingale * All rights reserved. 5*bf21cd93STycho Nightingale * 6*bf21cd93STycho Nightingale * Redistribution and use in source and binary forms, with or without 7*bf21cd93STycho Nightingale * modification, are permitted provided that the following conditions 8*bf21cd93STycho Nightingale * are met: 9*bf21cd93STycho Nightingale * 1. Redistributions of source code must retain the above copyright 10*bf21cd93STycho Nightingale * notice, this list of conditions and the following disclaimer. 11*bf21cd93STycho Nightingale * 2. Redistributions in binary form must reproduce the above copyright 12*bf21cd93STycho Nightingale * notice, this list of conditions and the following disclaimer in the 13*bf21cd93STycho Nightingale * documentation and/or other materials provided with the distribution. 14*bf21cd93STycho Nightingale * 15*bf21cd93STycho Nightingale * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16*bf21cd93STycho Nightingale * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17*bf21cd93STycho Nightingale * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18*bf21cd93STycho Nightingale * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19*bf21cd93STycho Nightingale * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20*bf21cd93STycho Nightingale * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21*bf21cd93STycho Nightingale * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22*bf21cd93STycho Nightingale * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23*bf21cd93STycho Nightingale * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24*bf21cd93STycho Nightingale * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25*bf21cd93STycho Nightingale * SUCH DAMAGE. 26*bf21cd93STycho Nightingale */ 27*bf21cd93STycho Nightingale 28*bf21cd93STycho Nightingale #include <sys/cdefs.h> 29*bf21cd93STycho Nightingale __FBSDID("$FreeBSD: head/usr.sbin/bhyve/ioapic.c 261268 2014-01-29 14:56:48Z jhb $"); 30*bf21cd93STycho Nightingale 31*bf21cd93STycho Nightingale #include <sys/types.h> 32*bf21cd93STycho Nightingale 33*bf21cd93STycho Nightingale #include <machine/vmm.h> 34*bf21cd93STycho Nightingale #include <vmmapi.h> 35*bf21cd93STycho Nightingale 36*bf21cd93STycho Nightingale #include "ioapic.h" 37*bf21cd93STycho Nightingale 38*bf21cd93STycho Nightingale /* 39*bf21cd93STycho Nightingale * Assign PCI INTx interrupts to I/O APIC pins in a round-robin 40*bf21cd93STycho Nightingale * fashion. Note that we have no idea what the HPET is using, but the 41*bf21cd93STycho Nightingale * HPET is also programmable whereas this is intended for hardwired 42*bf21cd93STycho Nightingale * PCI interrupts. 43*bf21cd93STycho Nightingale * 44*bf21cd93STycho Nightingale * This assumes a single I/O APIC where pins >= 16 are permitted for 45*bf21cd93STycho Nightingale * PCI devices. 46*bf21cd93STycho Nightingale */ 47*bf21cd93STycho Nightingale static int pci_pins; 48*bf21cd93STycho Nightingale 49*bf21cd93STycho Nightingale void 50*bf21cd93STycho Nightingale ioapic_init(struct vmctx *ctx) 51*bf21cd93STycho Nightingale { 52*bf21cd93STycho Nightingale 53*bf21cd93STycho Nightingale if (vm_ioapic_pincount(ctx, &pci_pins) < 0) { 54*bf21cd93STycho Nightingale pci_pins = 0; 55*bf21cd93STycho Nightingale return; 56*bf21cd93STycho Nightingale } 57*bf21cd93STycho Nightingale 58*bf21cd93STycho Nightingale /* Ignore the first 16 pins. */ 59*bf21cd93STycho Nightingale if (pci_pins <= 16) { 60*bf21cd93STycho Nightingale pci_pins = 0; 61*bf21cd93STycho Nightingale return; 62*bf21cd93STycho Nightingale } 63*bf21cd93STycho Nightingale pci_pins -= 16; 64*bf21cd93STycho Nightingale } 65*bf21cd93STycho Nightingale 66*bf21cd93STycho Nightingale int 67*bf21cd93STycho Nightingale ioapic_pci_alloc_irq(void) 68*bf21cd93STycho Nightingale { 69*bf21cd93STycho Nightingale static int last_pin; 70*bf21cd93STycho Nightingale 71*bf21cd93STycho Nightingale if (pci_pins == 0) 72*bf21cd93STycho Nightingale return (-1); 73*bf21cd93STycho Nightingale return (16 + (last_pin++ % pci_pins)); 74*bf21cd93STycho Nightingale } 75