1 /* 2 * Copyright (c) 2015 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 #ifndef _SYS_MEMORY_MAINTENANCE_H_ 30 #define _SYS_MEMORY_MAINTENANCE_H_ 31 32 /* 33 * File: sys/memory_maintenance.h 34 * Author: Samuel Gosselin [[email protected]] 35 * 36 * Header file for Memory Maintenance support. 37 */ 38 39 /* 40 * The kern.darkboot sysctl can be controlled from kexts or userspace. If 41 * processes want to change the sysctl value, they require the 42 * 'com.apple.private.kernel.darkboot' entitlement. 43 * 44 * Operating the kern.darkboot sysctl is done via using the commands below: 45 * 46 * - MEMORY_MAINTENANCE_DARK_BOOT_UNSET 47 * Unset the kern.darkboot sysctl (kern.sysctl=0). 48 * - MEMORY_MAINTENANCE_DARK_BOOT_SET 49 * Set the kern.darkboot sysctl (kern.sysctl=1). 50 * - MEMORY_MAINTENANCE_DARK_BOOT_SET_PERSISTENT 51 * Set the kern.darkboot sysctl (kern.sysctl=1) and save its 52 * value into the 'darkboot' NVRAM variable. 53 * 54 * Example: 55 * sysctl kern.darkboot=2 56 */ 57 #define MEMORY_MAINTENANCE_DARK_BOOT_UNSET (0) 58 #define MEMORY_MAINTENANCE_DARK_BOOT_SET (1) 59 #define MEMORY_MAINTENANCE_DARK_BOOT_SET_PERSISTENT (2) 60 61 #define MEMORY_MAINTENANCE_DARK_BOOT_NVRAM_NAME "darkboot" 62 63 #endif /* _SYS_MEMORY_MAINTENANCE_H_ */ 64