osfmk/kern/etap_map.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  * HISTORY
  30  *
  31  * Revision 1.1.1.1  1998/09/22 21:05:34  wsanchez
  32  * Import of Mac OS X kernel (~semeria)
  33  *
  34  * Revision 1.1.1.1  1998/03/07 02:25:54  wsanchez
  35  * Import of OSF Mach kernel (~mburg)
  36  *
  37  * Revision 1.1.6.1  1996/09/17  16:26:58  bruel
  38  *      use standalone includes only
  39  *      [1996/09/17  15:38:08  bruel]
  40  *
  41  * Revision 1.1.4.1  1996/02/02  12:16:40  emcmanus
  42  *      Copied from nmk20b5_shared.
  43  *      [1996/02/01  16:56:11  emcmanus]
  44  *
  45  * Revision 1.1.2.1  1995/12/30  17:12:07  emcmanus
  46  *      Renamed from i386/etap_map.c and made this file machine-independent.
  47  *      Delete declarations of event_table and subs_table, now declared with
  48  *      different types in etap_macros.h.
  49  *      [1995/12/30  17:03:55  emcmanus]
  50  *
  51  * Revision 1.1.2.4  1995/10/09  17:07:21  devrcs
  52  *      Merged in RT3_SHARED ETAP code.
  53  *      [1995/09/13  18:48:15  joe]
  54  *
  55  * Revision 1.1.2.3  1995/09/18  19:10:05  devrcs
  56  *      Merged in RT3_SHARED ETAP code.
  57  *      [1995/09/13  18:48:15  joe]
  58  *
  59  * Revision 1.1.2.2  1995/01/10  04:51:59  devrcs
  60  *      mk6 CR801 - merge up from nmk18b4 to nmk18b7
  61  *      tweak signatures, a la osc1.3b26
  62  *      [1994/12/09  20:38:32  dwm]
  63  *
  64  *      mk6 CR801 - new file for mk6_shared from cnmk_shared.
  65  *      [1994/12/01  21:11:35  dwm]
  66  *
  67  * Revision 1.1.2.1  1994/10/21  18:35:57  joe
  68  *      Initial ETAP submission
  69  *      [1994/10/20  19:21:39  joe]
  70  *
  71  * $EndLog$
  72  */
  73 /*
  74  * File :  etap_map.c
  75  *
  76  *         Pseudo-device driver to calculate the virtual addresses
  77  *         of all mappable ETAP buffers and tables: event table,
  78  *         subsystem table, cumulative buffer and monitor buffers.
  79  *
  80  */
  81 /*
  82  * Minor device number representation:
  83  *
  84  *      0       = ETAP_TABLE_EVENT
  85  *      1       = ETAP_TABLE_SUBSYSTEM
  86  *      2       = ETAP_BUFFER_CUMULATIVE
  87  *      3 & up  = a specific monitor buffer
  88  *
  89  */
  90
  91 #include <types.h>
  92
  93 #include <mach/vm_prot.h>
  94 #include <mach/vm_param.h>
  95 #include <mach/kern_return.h>
  96 #include <vm/pmap.h>
  97 #include <device/io_req.h>
  98 #include <device/dev_hdr.h>
  99
 100 #include <cpus.h>
 101 #include <kern/etap_options.h>
 102 #include <mach/etap.h>
 103 #include <kern/etap_map.h>
 104
 105
 106 #if     ETAP_LOCK_ACCUMULATE
 107 extern  cumulative_buffer_t     cbuff;
 108 #endif  /* ETAP_LOCK_ACCUMULATE */
 109
 110 #if     ETAP_MONITOR
 111 extern  monitor_buffer_t        mbuff[];
 112 #endif  /* ETAP_MONITOR */
 113
 114
 115 /*
 116  * etap_map_open - Check for valid minor device
 117  */
 118
 119 io_return_t
 120 etap_map_open(
 121         dev_t           dev,
 122         dev_mode_t      flags,
 123         io_req_t        ior)
 124 {
 125         int buffer = minor(dev);
 126
 127         if (buffer >= ETAP_MAX_DEVICES)
 128                 return(D_NO_SUCH_DEVICE);
 129
 130         return(D_SUCCESS);
 131 }
 132
 133 vm_offset_t
 134 etap_map_mmap (
 135         dev_t           dev,
 136         vm_offset_t     off,
 137         vm_prot_t       prot)
 138 {
 139         int             buffer = minor(dev);
 140         vm_offset_t     addr;
 141
 142         /*
 143          *  Check request validity
 144          */
 145
 146         if (prot & VM_PROT_WRITE)
 147                 return(KERN_PROTECTION_FAILURE);
 148
 149         if (buffer < 0 || buffer >= ETAP_MAX_DEVICES)
 150                 return(KERN_INVALID_ARGUMENT);
 151
 152         switch(buffer) {
 153                 case ETAP_TABLE_EVENT :
 154                         addr = trunc_page((char *) event_table) + off;
 155                         break;
 156                 case ETAP_TABLE_SUBSYSTEM :
 157                         addr = trunc_page((char *) subs_table) + off;
 158                         break;
 159                 case ETAP_BUFFER_CUMULATIVE :
 160 #if     ETAP_LOCK_ACCUMULATE
 161                         addr = (vm_offset_t) cbuff + off;
 162                         break;
 163 #else   /* ETAP_LOCK_ACCUMULATE */
 164                         return(KERN_INVALID_ARGUMENT);
 165 #endif  /* ETAP_LOCK_ACCUMULATE */
 166
 167                 default :
 168 #if     ETAP_MONITOR
 169                         addr = (vm_offset_t) mbuff[buffer - 3] + off;
 170                         break;
 171 #else   /* ETAP_MONITOR */
 172                         return(KERN_INVALID_ARGUMENT);
 173 #endif  /* ETAP_MONITOR */
 174
 175         }
 176         return machine_btop(pmap_extract(pmap_kernel(), addr));
 177 }