projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| f427ee49 A |
1 | /* |
| 2 | * Copyright (c) 2000-2020 Apple Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * This file contains Original Code and/or Modifications of Original Code | |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 9 | * compliance with the License. The rights granted to you under the License | |
| 10 | * may not be used to create, or enable the creation or redistribution of, | |
| 11 | * unlawful or unlicensed copies of an Apple operating system, or to | |
| 12 | * circumvent, violate, or enable the circumvention or violation of, any | |
| 13 | * terms of an Apple operating system software license agreement. | |
| 14 | * | |
| 15 | * Please obtain a copy of the License at | |
| 16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. | |
| 17 | * | |
| 18 | * The Original Code and all software distributed under the License are | |
| 19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 23 | * Please see the License for the specific language governing rights and | |
| 24 | * limitations under the License. | |
| 25 | * | |
| 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ | |
| 27 | */ | |
| 28 | ||
| 29 | #include <architecture/i386/pio.h> | |
| 30 | #include <i386/panic_notify.h> | |
| 31 | #include <kern/assert.h> | |
| 32 | #include <pexpert/pexpert.h> | |
| 33 | #include <stdint.h> | |
| 34 | ||
| 35 | /* | |
| 36 | * An I/O port to issue a read from, in the event of a panic. | |
| 37 | * Useful for triggering logic analyzers. | |
| 38 | */ | |
| 39 | static uint16_t panic_io_port = 0; | |
| 40 | ||
| 41 | /* | |
| 42 | * Similar to the panic_io_port, the pvpanic_io_port is used to notify | |
| 43 | * interested parties (in this case the host/hypervisor), that a panic | |
| 44 | * has occurred. | |
| 45 | * Where it differs from panic_io_port is that it is written and read | |
| 46 | * according to the pvpanic specification: | |
| 47 | * https://raw.githubusercontent.com/qemu/qemu/master/docs/specs/pvpanic.txt | |
| 48 | */ | |
| 49 | static uint16_t pvpanic_io_port = 0; | |
| 50 | ||
| 51 | void | |
| 52 | panic_notify_init(void) | |
| 53 | { | |
| 54 | (void) PE_parse_boot_argn("panic_io_port", &panic_io_port, sizeof(panic_io_port)); | |
| 55 | ||
| 56 | /* | |
| 57 | * XXX | |
| 58 | * Defer reading the notifcation bit until panic time. This maintains | |
| 59 | * backwards compatibility with Apple's QEMU. Once backwards | |
| 60 | * compatibilty is no longer needed the check should be performed here | |
| 61 | * before setting pvpanic_io_port. | |
| 62 | */ | |
| 63 | (void) PE_parse_boot_argn("pvpanic_io_port", &pvpanic_io_port, sizeof(pvpanic_io_port)); | |
| 64 | } | |
| 65 | ||
| 66 | void | |
| 67 | panic_notify(void) | |
| 68 | { | |
| 69 | if (panic_io_port != 0) { | |
| 70 | (void) inb(panic_io_port); | |
| 71 | } | |
| 72 | ||
| 73 | if (pvpanic_io_port != 0 && | |
| 74 | (inb(pvpanic_io_port) & PVPANIC_NOTIFICATION_BIT) != 0) { | |
| 75 | outb(pvpanic_io_port, PVPANIC_NOTIFICATION_BIT); | |
| 76 | } | |
| 77 | } |