osfmk/ppc/mem.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28
  29 /* A marvelous selection of support routines for virtual memory */
  30
  31 #include <cpus.h>
  32 #include <debug.h>
  33 #include <mach_kdb.h>
  34 #include <mach_vm_debug.h>
  35
  36 #include <kern/cpu_number.h>
  37 #include <kern/misc_protos.h>
  38 #include <kern/assert.h>
  39 #include <ppc/misc_protos.h>
  40 #include <ppc/mem.h>
  41 #include <ppc/pmap_internals.h>         /* For pmap_pteg_overflow */
  42
  43 /* These refer to physical addresses and are set and referenced elsewhere */
  44
  45 unsigned int hash_table_base;
  46 unsigned int hash_table_size;
  47
  48 unsigned int hash_function_mask;
  49
  50 struct shadowBAT shadow_BAT;
  51
  52 /* gather statistics about hash table usage */
  53
  54 #if     DEBUG
  55 #define MEM_STATS 1
  56 #else
  57 #define MEM_STATS 0
  58 #endif /* DEBUG */
  59
  60 #if MEM_STATS
  61 /* hash table usage information */
  62 struct hash_table_stats {
  63         int find_pte_in_pteg_calls;
  64         int find_pte_in_pteg_not_found;
  65         int find_pte_in_pteg_location[8];
  66         struct find_or_alloc_calls {
  67                 int found_primary;
  68                 int found_secondary;
  69                 int alloc_primary;
  70                 int alloc_secondary;
  71                 int overflow;
  72                 int not_found;
  73         } find_or_alloc_calls[2];
  74
  75 } hash_table_stats[NCPUS];
  76
  77 #define INC_STAT(LOC) \
  78         hash_table_stats[cpu_number()].find_pte_in_pteg_location[LOC]++
  79
  80 #else   /* MEM_STATS */
  81 #define INC_STAT(LOC)
  82 #endif  /* MEM_STATS */
  83
  84 /* Set up the machine registers for the given hash table.
  85  * The table has already been zeroed.
  86  */
  87 void hash_table_init(unsigned int base, unsigned int size)
  88 {
  89         sync();                                 /* SYNC: it's not just the law, it's a good idea... */
  90         mtsdr1(hash_table_base | ((size-1)>>16));       /* Slam the SDR1 with the has table address */
  91         sync();                                 /* SYNC: it's not just the law, it's a good idea... */
  92         isync();
  93 }
  94