osfmk/kern/etap_map.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  * HISTORY
  27  *
  28  * Revision 1.1.1.1  1998/09/22 21:05:34  wsanchez
  29  * Import of Mac OS X kernel (~semeria)
  30  *
  31  * Revision 1.1.1.1  1998/03/07 02:25:54  wsanchez
  32  * Import of OSF Mach kernel (~mburg)
  33  *
  34  * Revision 1.1.6.1  1996/09/17  16:26:58  bruel
  35  *      use standalone includes only
  36  *      [1996/09/17  15:38:08  bruel]
  37  *
  38  * Revision 1.1.4.1  1996/02/02  12:16:40  emcmanus
  39  *      Copied from nmk20b5_shared.
  40  *      [1996/02/01  16:56:11  emcmanus]
  41  *
  42  * Revision 1.1.2.1  1995/12/30  17:12:07  emcmanus
  43  *      Renamed from i386/etap_map.c and made this file machine-independent.
  44  *      Delete declarations of event_table and subs_table, now declared with
  45  *      different types in etap_macros.h.
  46  *      [1995/12/30  17:03:55  emcmanus]
  47  *
  48  * Revision 1.1.2.4  1995/10/09  17:07:21  devrcs
  49  *      Merged in RT3_SHARED ETAP code.
  50  *      [1995/09/13  18:48:15  joe]
  51  *
  52  * Revision 1.1.2.3  1995/09/18  19:10:05  devrcs
  53  *      Merged in RT3_SHARED ETAP code.
  54  *      [1995/09/13  18:48:15  joe]
  55  *
  56  * Revision 1.1.2.2  1995/01/10  04:51:59  devrcs
  57  *      mk6 CR801 - merge up from nmk18b4 to nmk18b7
  58  *      tweak signatures, a la osc1.3b26
  59  *      [1994/12/09  20:38:32  dwm]
  60  *
  61  *      mk6 CR801 - new file for mk6_shared from cnmk_shared.
  62  *      [1994/12/01  21:11:35  dwm]
  63  *
  64  * Revision 1.1.2.1  1994/10/21  18:35:57  joe
  65  *      Initial ETAP submission
  66  *      [1994/10/20  19:21:39  joe]
  67  *
  68  * $EndLog$
  69  */
  70 /*
  71  * File :  etap_map.c
  72  *
  73  *         Pseudo-device driver to calculate the virtual addresses
  74  *         of all mappable ETAP buffers and tables: event table,
  75  *         subsystem table, cumulative buffer and monitor buffers.
  76  *
  77  */
  78 /*
  79  * Minor device number representation:
  80  *
  81  *      0       = ETAP_TABLE_EVENT
  82  *      1       = ETAP_TABLE_SUBSYSTEM
  83  *      2       = ETAP_BUFFER_CUMULATIVE
  84  *      3 & up  = a specific monitor buffer
  85  *
  86  */
  87
  88 #include <types.h>
  89
  90 #include <mach/vm_prot.h>
  91 #include <mach/vm_param.h>
  92 #include <mach/kern_return.h>
  93 #include <vm/pmap.h>
  94 #include <device/io_req.h>
  95 #include <device/dev_hdr.h>
  96
  97 #include <cpus.h>
  98 #include <kern/etap_options.h>
  99 #include <mach/etap.h>
 100 #include <kern/etap_map.h>
 101
 102
 103 #if     ETAP_LOCK_ACCUMULATE
 104 extern  cumulative_buffer_t     cbuff;
 105 #endif  /* ETAP_LOCK_ACCUMULATE */
 106
 107 #if     ETAP_MONITOR
 108 extern  monitor_buffer_t        mbuff[];
 109 #endif  /* ETAP_MONITOR */
 110
 111
 112 /*
 113  * etap_map_open - Check for valid minor device
 114  */
 115
 116 io_return_t
 117 etap_map_open(
 118         dev_t           dev,
 119         dev_mode_t      flags,
 120         io_req_t        ior)
 121 {
 122         int buffer = minor(dev);
 123
 124         if (buffer >= ETAP_MAX_DEVICES)
 125                 return(D_NO_SUCH_DEVICE);
 126
 127         return(D_SUCCESS);
 128 }
 129
 130 vm_offset_t
 131 etap_map_mmap (
 132         dev_t           dev,
 133         vm_offset_t     off,
 134         vm_prot_t       prot)
 135 {
 136         int             buffer = minor(dev);
 137         vm_offset_t     addr;
 138
 139         /*
 140          *  Check request validity
 141          */
 142
 143         if (prot & VM_PROT_WRITE)
 144                 return(KERN_PROTECTION_FAILURE);
 145
 146         if (buffer < 0 || buffer >= ETAP_MAX_DEVICES)
 147                 return(KERN_INVALID_ARGUMENT);
 148
 149         switch(buffer) {
 150                 case ETAP_TABLE_EVENT :
 151                         addr = trunc_page((char *) event_table) + off;
 152                         break;
 153                 case ETAP_TABLE_SUBSYSTEM :
 154                         addr = trunc_page((char *) subs_table) + off;
 155                         break;
 156                 case ETAP_BUFFER_CUMULATIVE :
 157 #if     ETAP_LOCK_ACCUMULATE
 158                         addr = (vm_offset_t) cbuff + off;
 159                         break;
 160 #else   /* ETAP_LOCK_ACCUMULATE */
 161                         return(KERN_INVALID_ARGUMENT);
 162 #endif  /* ETAP_LOCK_ACCUMULATE */
 163
 164                 default :
 165 #if     ETAP_MONITOR
 166                         addr = (vm_offset_t) mbuff[buffer - 3] + off;
 167                         break;
 168 #else   /* ETAP_MONITOR */
 169                         return(KERN_INVALID_ARGUMENT);
 170 #endif  /* ETAP_MONITOR */
 171
 172         }
 173         return machine_btop(pmap_extract(pmap_kernel(), addr));
 174 }