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Annotation of XNU/osfmk/kern/etap_map.c, revision 1.1

1.1     ! root        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: }

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