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