osfmk/ppc/Performance.s

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * @OSF_COPYRIGHT_INTERNAL_USE_ONLY@
  25  */
  26
  27 /*
  28         Performance.s
  29
  30         Handle things that should are related to the hardware performance monitor
  31
  32         Lovingly crafted by Bill Angell using traditional methods and only natural or recycled materials.
  33         No more than 7500 chinchillas were killed in the production of the code.
  34
  35 */
  36
  37 #include <ppc/asm.h>
  38 #include <ppc/proc_reg.h>
  39 #include <ppc/exception.h>
  40 #include <ppc/Performance.h>
  41 #include <mach/machine/vm_param.h>
  42 #include <assym.s>
  43
  44 #if PERF_HIST
  45 /*
  46  *                      This routine is used to interface to the performance monitor
  47  */
  48
  49 ENTRY(PerfCtl, TAG_NO_FRAME_USED)
  50
  51                         lis             r0,PerfCtlCall@h                                /* Get the top part of the SC number */
  52                         ori             r0,r0,PerfCtlCall@l                             /* and the bottom part */
  53                         sc                                                                              /* Do it to it */
  54                         blr                                                                             /* Bye bye, Birdie... */
  55
  56
  57 ENTRY(PerfCtlLL, TAG_NO_FRAME_USED)
  58
  59                         cmplwi  r3,maxPerf                                              /* See if we are within range */
  60                         mflr    r11                                                             /* Get the return point */
  61                         li              r3,0                                                    /* Show failure */
  62                         bgelrl-                                                                 /* Load up current address and, also, leave if out of range */
  63 prfBase:        mflr    r12                                                             /* Get our address */
  64                         rlwinm  r10,r3,2,0,31                                   /* Get displacement into branch table */
  65                         addi    r12,r12,prfBrnch-prfBase                /* Point to the branch address */
  66                         add             r12,r12,r10                                             /* Point to the branch */
  67                         mtlr    r12                                                             /* Get it in the link register */
  68                         blr                                                                             /* Vector to the specific performance command... */
  69
  70 prfBrnch:       b               prfClear                                                /* Clear the histogram table */
  71                         b               prfStart                                                /* Start the performance monitor */
  72                         b               prfStop                                                 /* Stop the performance monitor */
  73                         b               prfMap                                                  /* Map the histogram into an address space */
  74                         .equ    maxPerf, (.-prfBrnch)/4                 /* Set the highest valid address */
  75
  76 /*
  77  *                      Clear the monitor histogram
  78  */
  79 prfClear:
  80                         li              r4,PMIhist@l                                    /* We know this to be in page 0, so no need for the high part */
  81                         lis             r8,PMIHIST_SIZE@h                               /* Get high half of the table size */
  82                         lwz             r4,0(r4)                                                /* Get the real address of the histgram */
  83                         ori             r8,r8,PMIHIST_SIZE@l                    /* Get the low half of the table size */
  84                         li              r6,32                                                   /* Get a displacement */
  85                         li              r3,1                                                    /* Set up a good return code */
  86                         mtlr    r11                                                             /* Restore the return address */
  87
  88 clrloop:        subi    r8,r8,32                                                /* Back off a cache line */
  89                         dcbz    0,r4                                                    /* Do the even line */
  90                         sub.    r8,r8,r6                                                /* Back off a second time (we only do this to generate a CR */
  91                         dcbz    r6,r4                                                   /* Clear the even line */
  92                         addi    r4,r4,64                                                /* Move up to every other line */
  93                         bgt+    clrloop                                                 /* Go until we've done it all... */
  94
  95                         blr                                                                             /* Leave... */
  96
  97 /*
  98  *                      Start the monitor histogram
  99  */
 100  prfStart:
 101                         mtlr    r11                                                             /* Restore the return address */
 102                         blr                                                                             /* Return... */
 103
 104 /*
 105  *                      Stop the monitor histogram
 106  */
 107  prfStop:
 108                         mtlr    r11                                                             /* Restore the return address */
 109                         blr                                                                             /* Return... */
 110
 111 /*
 112  *                      Maps the monitor histogram into another address space
 113  */
 114  prfMap:
 115                         mtlr    r11                                                             /* Restore the return address */
 116                         blr                                                                             /* Return... */
 117
 118 #endif
 119