1 /* 2 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* 29 * @OSF_COPYRIGHT@ 30 */ 31 /* 32 * Mach Operating System 33 * Copyright (c) 1991,1990,1989 Carnegie Mellon University 34 * All Rights Reserved. 35 * 36 * Permission to use, copy, modify and distribute this software and its 37 * documentation is hereby granted, provided that both the copyright 38 * notice and this permission notice appear in all copies of the 39 * software, derivative works or modified versions, and any portions 40 * thereof, and that both notices appear in supporting documentation. 41 * 42 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 43 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 44 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 45 * 46 * Carnegie Mellon requests users of this software to return to 47 * 48 * Software Distribution Coordinator or [email protected] 49 * School of Computer Science 50 * Carnegie Mellon University 51 * Pittsburgh PA 15213-3890 52 * 53 * any improvements or extensions that they make and grant Carnegie Mellon 54 * the rights to redistribute these changes. 55 */ 56 /* 57 */ 58 /* 59 * File: ipc/ipc_table.h 60 * Author: Rich Draves 61 * Date: 1989 62 * 63 * Definitions for tables, used for IPC capabilities (ipc_entry_t) 64 * and dead-name requests (ipc_port_request_t). 65 */ 66 67 #ifndef _IPC_IPC_TABLE_H_ 68 #define _IPC_IPC_TABLE_H_ 69 70 #include <mach/mach_types.h> 71 #include <mach/boolean.h> 72 #include <mach/vm_param.h> 73 #include <kern/kalloc.h> 74 75 #include <ipc/ipc_types.h> 76 77 /* 78 * The is_table_next field of an ipc_space_t points to 79 * an ipc_table_size structure. These structures must 80 * be elements of an array, ipc_table_entries. 81 * 82 * The array must end with two elements with the same its_size value. 83 * Except for the terminating element, the its_size values must 84 * be strictly increasing. The largest (last) its_size value 85 * must be less than or equal to MACH_PORT_INDEX(MACH_PORT_DEAD). 86 * This ensures that 87 * 1) MACH_PORT_INDEX(MACH_PORT_DEAD) isn't a valid index 88 * in the table, so ipc_entry_get won't allocate it. 89 * 2) MACH_PORT_MAKE(index+1, 0) and MAKE_PORT_MAKE(size, 0) 90 * won't ever overflow. 91 * 92 * 93 * The ipr_size field of the first element in a table of 94 * dead-name requests (ipc_port_request_t) points to the 95 * ipc_table_size structure. The structures must be elements 96 * of ipc_table_dnrequests. ipc_table_dnrequests must end 97 * with an element with zero its_size, and except for this last 98 * element, the its_size values must be strictly increasing. 99 * 100 * The is_table_next field points to the ipc_table_size structure 101 * for the next larger size of table, not the one currently in use. 102 * The ipr_size field points to the currently used ipc_table_size. 103 */ 104 105 struct ipc_table_size { 106 ipc_table_elems_t its_size; /* number of elements in table */ 107 }; 108 109 extern struct ipc_table_size ipc_table_entries[]; 110 extern struct ipc_table_size ipc_table_requests[]; 111 KALLOC_TYPE_VAR_DECLARE(kt_var_it_entries); 112 113 /* 114 * Note that ipc_table_alloc and ipc_table_free 115 * potentially use the VM system. Hence simple locks can't 116 * be held across them. 117 */ 118 119 #define it_entries_alloc(its) \ 120 (struct ipc_entry *) kalloc_type_var_impl(kt_var_it_entries, \ 121 kt_size(0, sizeof(struct ipc_entry), (its)->its_size), \ 122 __zone_flags_mix_tag(Z_WAITOK | Z_ZERO, VM_ALLOC_SITE_TAG()), NULL) 123 124 #define it_entries_free(count, table) ({ \ 125 __auto_type __count = (count); \ 126 kfree_type_var_impl(kt_var_it_entries, os_ptr_load_and_erase(table), \ 127 kt_size(0, sizeof(struct ipc_entry), __count)); \ 128 }) 129 130 #define it_requests_alloc(its) \ 131 kalloc_type(struct ipc_port_request, (its)->its_size, Z_WAITOK | Z_ZERO) 132 133 #define it_requests_free(its, table) \ 134 kfree_type(struct ipc_port_request, (its)->its_size, table) 135 136 extern unsigned int ipc_table_max_entries(void); 137 extern unsigned int ipc_table_max_requests(void); 138 139 #endif /* _IPC_IPC_TABLE_H_ */ 140