projects / apple / xnu.git / blame
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|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| e5568f75 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 | * |
| e5568f75 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, | |
| e5568f75 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 | */ | |
| 22 | /* | |
| 23 | AltiAssist.s | |
| 24 | ||
| 25 | Do the VMX assists | |
| 26 | ||
| 27 | Lovingly crafted by Bill Angell using traditional methods and only natural or recycled materials. | |
| 28 | No animal products are used other than rendered otter bile and deep fried pork lard. | |
| 29 | ||
| 30 | */ | |
| 31 | ||
| 1c79356b A |
32 | #include <ppc/asm.h> |
| 33 | #include <ppc/proc_reg.h> | |
| 34 | #include <ppc/exception.h> | |
| 35 | #include <mach/machine/vm_param.h> | |
| 36 | #include <assym.s> | |
| 37 | ||
| 38 | ; | |
| 39 | ; | |
| 40 | ; General stuff what happens here: | |
| 41 | ; 1) All general context saved, interrupts off, translation off | |
| 42 | ; 2) Vector and floating point disabled, but there may be live context. | |
| 43 | ; This code is responsible for saving and restoring what is used. This | |
| 44 | ; includes exception states, java mode, etc. | |
| 45 | ; 3) No attempt is made to resolve page faults. PTE misses are handled | |
| 46 | ; automatically, but actual faults (ala copyin/copyout) are not. If | |
| 47 | ; a fault does occur, the exception that caused entry to the emulation | |
| 48 | ; routine is remapped to either an instruction or data miss (depending | |
| 49 | ; upon the stage detected) and redriven through the exception handler. | |
| 50 | ; The only time that an instruction fault can happen is when a different | |
| 51 | ; processor removes a mapping between our original fault and when we | |
| 52 | ; fetch the assisted instruction. For an assisted instruction, data | |
| 53 | ; faults should not occur (except in the MP case). For a purely | |
| 54 | ; emulated instruction, faults can occur. | |
| 55 | ; | |
| 56 | ; Emulation algorithms cloned from MacOS 9 code. | |
| 57 | ; | |
| 58 | ; Assumes that R2 = per_proc_area | |
| 59 | ; | |
| 60 | ; | |
| 61 | ||
| 62 | ||
| 63 | .align 5 | |
| 64 | .globl EXT(AltivecAssist) | |
| 65 | ||
| 66 | LEXT(AltivecAssist) | |
| 67 | ||
| 1c79356b | 68 | li r10,emvr0 ; Point to the vector savearea |
| 1c79356b A |
69 | |
| 70 | li r11,emvr1 ; Another savearea | |
| 71 | stvxl v0,r10,r2 ; Save V0 | |
| 72 | stvxl v1,r11,r2 ; Save V1 | |
| 73 | vspltisw v0,1 ; Set a 1 in V0 | |
| 74 | vspltisw v1,8 ; Get half of the shift | |
| 75 | vslw v0,v0,v1 ; Shift half way | |
| 76 | vslw v0,v0,v1 ; Shift the rest of the way (we now have 0x00010000) | |
| 77 | mfvscr v1 ; Get the VSCR | |
| 78 | vor v1,v1,v0 ; Turn off Java mode | |
| 79 | lvxl v0,r10,r2 ; Restore V0 | |
| 80 | mtvscr v1 ; Set Java mode off | |
| 81 | lvxl v1,r11,r2 ; Restore V1 | |
| 82 | ||
| 83 | li r11,T_IN_VAIN ; We are all done | |
| 84 | b EXT(EmulExit) ; We are done, no tracing on... | |
| 85 | ||
| 86 | ||
| 87 | ||
| 88 |