1 /* 2 * Copyright (c) 2006-2012 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 /* Helper macros for 64-bit mode switching */ 30 31 32 /* 33 * Long jump to 64-bit space from 32-bit compatibility mode. 34 * Effected, in fact, by a long return .. 35 * - we push the 64-bit kernel code selector KERNEL64_CS 36 * - call .+1 to get EIP on stack 37 * - adjust return address after lret 38 * - lret to return to next instruction but 64-bit mode. 39 */ 40 #define ENTER_64BIT_MODE() \ 41 push $KERNEL64_CS ;\ 42 call 1f ;\ 43 1: addl $(2f-1b), (%esp) ;\ 44 lret ;\ 45 2: .code64 46 47 /* 48 * Long jump to 32-bit compatibility mode from 64-bit space. 49 * Effected by long return similar to ENTER_64BIT_MODE. 50 */ 51 #define ENTER_COMPAT_MODE() \ 52 call 3f ;\ 53 3: addq $(4f-3b), (%rsp) ;\ 54 movl $KERNEL32_CS, 4(%rsp) ;\ 55 lret ;\ 56 4: .code32 57 58