projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b | 1 | /* |
| c0fea474 | 2 | * Copyright (c) 2006 Apple Computer, Inc. All rights reserved. |
| 1c79356b A |
3 | * |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 37839358 A |
6 | * The contents of this file constitute Original Code as defined in and |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 1c79356b | 11 | * |
| 37839358 A |
12 | * This Original Code and all software distributed under the License are |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 1c79356b A |
14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 37839358 A |
16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 1c79356b A |
19 | * |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| c0fea474 A |
22 | |
| 23 | /* Helper macros for 64-bit mode switching */ | |
| 24 | ||
| 1c79356b | 25 | /* |
| c0fea474 | 26 | * Long jump to 64-bit space from 32-bit compatibility mode. |
| 1c79356b | 27 | */ |
| c0fea474 A |
28 | #define ENTER_64BIT_MODE() \ |
| 29 | .code32 ;\ | |
| 30 | .byte 0xea /* far jump longmode */ ;\ | |
| 31 | .long 1f ;\ | |
| 32 | .word KERNEL64_CS ;\ | |
| 33 | .code64 ;\ | |
| 34 | 1: | |
| 1c79356b | 35 | |
| c0fea474 A |
36 | /* |
| 37 | * Here in long mode but still running below 4G. | |
| 38 | * "Near" jump into uber-space. | |
| 39 | */ | |
| 40 | #define ENTER_UBERSPACE() \ | |
| 41 | mov 2f,%rax ;\ | |
| 42 | jmp *%rax ;\ | |
| 43 | 2: .long 3f ;\ | |
| 44 | .long KERNEL_UBER_BASE_HI32 ;\ | |
| 45 | 3: | |
| 46 | ||
| 47 | /* | |
| 48 | * Long jump to 32-bit compatibility mode from 64-bit space. | |
| 49 | */ | |
| 50 | #define ENTER_COMPAT_MODE() \ | |
| 51 | ljmp *4f ;\ | |
| 52 | 4: .long 5f ;\ | |
| 53 | .word KERNEL_CS ;\ | |
| 54 | .code32 ;\ | |
| 55 | 5: | |
| 1c79356b | 56 |