osfmk/ppc/mem.c

   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  * @OSF_COPYRIGHT@
  24  */
  25
  26 /* A marvelous selection of support routines for virtual memory */
  27
  28 #include <cpus.h>
  29 #include <debug.h>
  30 #include <mach_kdb.h>
  31 #include <mach_vm_debug.h>
  32
  33 #include <kern/cpu_number.h>
  34 #include <kern/misc_protos.h>
  35 #include <kern/assert.h>
  36 #include <ppc/misc_protos.h>
  37 #include <ppc/mem.h>
  38 #include <ppc/pmap_internals.h>         /* For pmap_pteg_overflow */
  39
  40 /* These refer to physical addresses and are set and referenced elsewhere */
  41
  42 unsigned int hash_table_base;
  43 unsigned int hash_table_size;
  44
  45 unsigned int hash_function_mask;
  46
  47 struct shadowBAT shadow_BAT;
  48
  49 /* gather statistics about hash table usage */
  50
  51 #if     DEBUG
  52 #define MEM_STATS 1
  53 #else
  54 #define MEM_STATS 0
  55 #endif /* DEBUG */
  56
  57 #if MEM_STATS
  58 /* hash table usage information */
  59 struct hash_table_stats {
  60         int find_pte_in_pteg_calls;
  61         int find_pte_in_pteg_not_found;
  62         int find_pte_in_pteg_location[8];
  63         struct find_or_alloc_calls {
  64                 int found_primary;
  65                 int found_secondary;
  66                 int alloc_primary;
  67                 int alloc_secondary;
  68                 int overflow;
  69                 int not_found;
  70         } find_or_alloc_calls[2];
  71
  72 } hash_table_stats[NCPUS];
  73
  74 #define INC_STAT(LOC) \
  75         hash_table_stats[cpu_number()].find_pte_in_pteg_location[LOC]++
  76
  77 #else   /* MEM_STATS */
  78 #define INC_STAT(LOC)
  79 #endif  /* MEM_STATS */
  80
  81 /* Set up the machine registers for the given hash table.
  82  * The table has already been zeroed.
  83  */
  84 void hash_table_init(unsigned int base, unsigned int size)
  85 {
  86         sync();                                 /* SYNC: it's not just the law, it's a good idea... */
  87         mtsdr1(hash_table_base | ((size-1)>>16));       /* Slam the SDR1 with the has table address */
  88         sync();                                 /* SYNC: it's not just the law, it's a good idea... */
  89         isync();
  90 }
  91