/*
* Copyright (c) 2006-2012 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_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
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*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* Helper macros for 64-bit mode switching */
/*
* Long jump to 64-bit space from 32-bit compatibility mode.
* Effected, in fact, by a long return ..
* - we push the 64-bit kernel code selector KERNEL64_CS
* - call .+1 to get EIP on stack
* - adjust return address after lret
* - lret to return to next instruction but 64-bit mode.
*/
#define ENTER_64BIT_MODE() \
push $KERNEL64_CS ;\
call 1f ;\
1: addl $(2f-1b), (%esp) ;\
lret ;\
2: .code64
/*
* Long jump to 32-bit compatibility mode from 64-bit space.
* Effected by long return similar to ENTER_64BIT_MODE.
*/
#define ENTER_COMPAT_MODE() \
call 3f ;\
3: addq $(4f-3b), (%rsp) ;\
movl $KERNEL32_CS, 4(%rsp) ;\
lret ;\
4: .code32