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