/* * Copyright (c) 2000-2020 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #include <architecture/i386/pio.h> #include <i386/panic_notify.h> #include <kern/assert.h> #include <pexpert/pexpert.h> #include <stdint.h> /* * An I/O port to issue a read from, in the event of a panic. * Useful for triggering logic analyzers. */ static uint16_t panic_io_port = 0; /* * Similar to the panic_io_port, the pvpanic_io_port is used to notify * interested parties (in this case the host/hypervisor), that a panic * has occurred. * Where it differs from panic_io_port is that it is written and read * according to the pvpanic specification: * https://raw.githubusercontent.com/qemu/qemu/master/docs/specs/pvpanic.txt */ static uint16_t pvpanic_io_port = 0; void panic_notify_init(void) { (void) PE_parse_boot_argn("panic_io_port", &panic_io_port, sizeof(panic_io_port)); /* * XXX * Defer reading the notifcation bit until panic time. This maintains * backwards compatibility with Apple's QEMU. Once backwards * compatibilty is no longer needed the check should be performed here * before setting pvpanic_io_port. */ (void) PE_parse_boot_argn("pvpanic_io_port", &pvpanic_io_port, sizeof(pvpanic_io_port)); } void panic_notify(void) { if (panic_io_port != 0) { (void) inb(panic_io_port); } if (pvpanic_io_port != 0 && (inb(pvpanic_io_port) & PVPANIC_NOTIFICATION_BIT) != 0) { outb(pvpanic_io_port, PVPANIC_NOTIFICATION_BIT); } }