1/* 2 * Copyright (c) 2006 Apple Computer, 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 * Long jump to 64-bit space from 32-bit compatibility mode. 33 */ 34#define ENTER_64BIT_MODE() \ 35 .code32 ;\ 36 .byte 0xea /* far jump longmode */ ;\ 37 .long 1f ;\ 38 .word KERNEL64_CS ;\ 39 .code64 ;\ 401: 41 42/* 43 * Here in long mode but still running below 4G. 44 * "Near" jump into uber-space. 45 */ 46#define ENTER_UBERSPACE() \ 47 mov 2f,%rax ;\ 48 jmp *%rax ;\ 492: .long 3f ;\ 50 .long KERNEL_UBER_BASE_HI32 ;\ 513: 52 53/* 54 * Long jump to 32-bit compatibility mode from 64-bit space. 55 */ 56#define ENTER_COMPAT_MODE() \ 57 ljmp *(%rip) ;\ 58 .long 4f ;\ 59 .word KERNEL_CS ;\ 60 .code32 ;\ 614: 62 63