| | 1 | /* |
| | 2 | * Copyright (c) 2006-2012 Apple 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 | /* |
| | 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 | |
projects / apple / xnu.git / blame_incremental