AltiAssist.s

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    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.
   11  * 
   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
   14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   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.
   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 
   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 
   68                         li                      r10,emvr0                                       ; Point to the vector savearea
   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

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sys/osfmk/ppc/AltiAssist.s