/*
 * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code 
 * as defined in and that are subject to the Apple Public Source License 
 * Version 2.0 (the 'License'). You may not use this file except in 
 * compliance with the License.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * Please obtain a copy of the License at 
 * http://www.opensource.apple.com/apsl/ and read it before using this 
 * file.
 *
 * The Original Code and all software distributed under the License are 
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * Please see the License for the specific language governing rights and 
 * limitations under the License.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
 */

/* Helper macros for 64-bit mode switching */

/*
 * Long jump to 64-bit space from 32-bit compatibility mode.
 */
#define	ENTER_64BIT_MODE()			\
	.code32					;\
	.byte   0xea	/* far jump longmode */	;\
	.long   1f				;\
	.word   KERNEL64_CS			;\
        .code64					;\
1:

/*
 * Here in long mode but still running below 4G.
 * "Near" jump into uber-space.
 */
#define	ENTER_UBERSPACE()			\
        mov     2f,%rax				;\
        jmp     *%rax				;\
2:      .long   3f				;\
        .long   KERNEL_UBER_BASE_HI32		;\
3:     

/*
 * Long jump to 32-bit compatibility mode from 64-bit space.
 */
#define ENTER_COMPAT_MODE()			\
	ljmp	*4f				;\
4:	.long	5f				;\
	.word	KERNEL_CS			;\
	.code32					;\
5:

