projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 6601e61a | 1 | /* |
| 39236c6e | 2 | * Copyright (c) 2006-2012 Apple Inc. All rights reserved. |
| 6601e61a | 3 | * |
| 2d21ac55 | 4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
| 6601e61a | 5 | * |
| 2d21ac55 A |
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. | |
| 6601e61a | 14 | * |
| 2d21ac55 A |
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 | |
| 6601e61a A |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 2d21ac55 A |
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. | |
| 6601e61a | 25 | * |
| 2d21ac55 | 26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
| 6601e61a | 27 | */ |
| 0c530ab8 A |
28 | |
| 29 | /* Helper macros for 64-bit mode switching */ | |
| 30 | ||
| 316670eb A |
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 |