1251877Speter/*- 2251877Speter * Copyright (c) 2014 Hudson River Trading LLC 3251877Speter * Written by: John H. Baldwin <jhb@FreeBSD.org> 4251877Speter * All rights reserved. 5251877Speter * 6251877Speter * Redistribution and use in source and binary forms, with or without 7251877Speter * modification, are permitted provided that the following conditions 8251877Speter * are met: 9251877Speter * 1. Redistributions of source code must retain the above copyright 10251877Speter * notice, this list of conditions and the following disclaimer. 11251877Speter * 2. Redistributions in binary form must reproduce the above copyright 12251877Speter * notice, this list of conditions and the following disclaimer in the 13251877Speter * documentation and/or other materials provided with the distribution. 14251877Speter * 15251877Speter * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16251877Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17253895Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18251877Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19253895Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20251877Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21262324Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22253895Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23253895Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24253895Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25253895Speter * SUCH DAMAGE. 26251877Speter */ 27253895Speter 28262324Speter#include <sys/cdefs.h> 29251877Speter__FBSDID("$FreeBSD$"); 30251877Speter 31253895Speter#include <sys/types.h> 32251877Speter 33253895Speter#include <machine/vmm.h> 34251877Speter#include <vmmapi.h> 35253895Speter 36251877Speter#include "ioapic.h" 37253895Speter 38253895Speter/* 39253895Speter * Assign PCI INTx interrupts to I/O APIC pins in a round-robin 40253895Speter * fashion. Note that we have no idea what the HPET is using, but the 41253895Speter * HPET is also programmable whereas this is intended for hardwired 42253895Speter * PCI interrupts. 43253895Speter * 44253895Speter * This assumes a single I/O APIC where pins >= 16 are permitted for 45253895Speter * PCI devices. 46253895Speter */ 47253895Speterstatic int pci_pins; 48253895Speter 49253895Spetervoid 50253895Speterioapic_init(struct vmctx *ctx) 51253895Speter{ 52253895Speter 53253895Speter if (vm_ioapic_pincount(ctx, &pci_pins) < 0) { 54253895Speter pci_pins = 0; 55253895Speter return; 56253895Speter } 57262324Speter 58262324Speter /* Ignore the first 16 pins. */ 59262324Speter if (pci_pins <= 16) { 60262324Speter pci_pins = 0; 61262324Speter return; 62262324Speter } 63253895Speter pci_pins -= 16; 64253895Speter} 65253895Speter 66253895Speterint 67253895Speterioapic_pci_alloc_irq(void) 68253895Speter{ 69253895Speter static int last_pin; 70253895Speter 71253895Speter if (pci_pins == 0) 72253895Speter return (-1); 73253895Speter return (16 + (last_pin++ % pci_pins)); 74253895Speter} 75253895Speter