| | 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 | * Mach Operating System |
| | 27 | * Copyright (c) 1991,1990 Carnegie Mellon University |
| | 28 | * All Rights Reserved. |
| | 29 | * |
| | 30 | * Permission to use, copy, modify and distribute this software and its |
| | 31 | * documentation is hereby granted, provided that both the copyright |
| | 32 | * notice and this permission notice appear in all copies of the |
| | 33 | * software, derivative works or modified versions, and any portions |
| | 34 | * thereof, and that both notices appear in supporting documentation. |
| | 35 | * |
| | 36 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| | 37 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| | 38 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| | 39 | * |
| | 40 | * Carnegie Mellon requests users of this software to return to |
| | 41 | * |
| | 42 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| | 43 | * School of Computer Science |
| | 44 | * Carnegie Mellon University |
| | 45 | * Pittsburgh PA 15213-3890 |
| | 46 | * |
| | 47 | * any improvements or extensions that they make and grant Carnegie Mellon |
| | 48 | * the rights to redistribute these changes. |
| | 49 | */ |
| | 50 | /* |
| | 51 | */ |
| | 52 | |
| | 53 | #include <platforms.h> |
| | 54 | #include <cpus.h> |
| | 55 | #include <mach/boolean.h> |
| | 56 | #include <mach/port.h> |
| | 57 | #include <kern/thread.h> |
| | 58 | #include <kern/task.h> |
| | 59 | |
| | 60 | #include <ipc/ipc_port.h> |
| | 61 | #include <ipc/ipc_space.h> |
| | 62 | #include <ipc/ipc_right.h> |
| | 63 | #include <ipc/ipc_object.h> |
| | 64 | #include <ipc/ipc_entry.h> |
| | 65 | |
| | 66 | #include <i386/thread.h> |
| | 67 | #include <i386/io_port.h> |
| | 68 | #include <i386/io_emulate.h> |
| | 69 | #include <i386/iopb_entries.h> |
| | 70 | |
| | 71 | int |
| | 72 | emulate_io( |
| | 73 | struct i386_saved_state *regs, |
| | 74 | int opcode, |
| | 75 | int io_port) |
| | 76 | { |
| | 77 | #if 1 |
| | 78 | /* At the moment, we are not allowing I/O emulation |
| | 79 | * |
| | 80 | * FIXME - this should probably change due to |
| | 81 | * the Window Server's need to map I/O ports into its space. |
| | 82 | */ |
| | 83 | |
| | 84 | return EM_IO_ERROR; |
| | 85 | #else |
| | 86 | thread_t thread = current_thread(); |
| | 87 | at386_io_lock_state(); |
| | 88 | |
| | 89 | if (iopl_emulate(regs, opcode, io_port)) |
| | 90 | return EM_IO_DONE; |
| | 91 | |
| | 92 | if (iopb_check_mapping(thread, iopl_device)) |
| | 93 | return EM_IO_ERROR; |
| | 94 | |
| | 95 | /* |
| | 96 | * Check for send rights to the IOPL device port. |
| | 97 | */ |
| | 98 | if (iopl_device_port == IP_NULL) |
| | 99 | return EM_IO_ERROR; |
| | 100 | { |
| | 101 | ipc_space_t space = current_space(); |
| | 102 | mach_port_name_t name; |
| | 103 | ipc_entry_t entry; |
| | 104 | boolean_t has_rights = FALSE; |
| | 105 | ipc_entry_bits_t *capability; |
| | 106 | |
| | 107 | is_write_lock(space); |
| | 108 | assert(space->is_active); |
| | 109 | |
| | 110 | if (ipc_right_reverse(space, (ipc_object_t) iopl_device_port, |
| | 111 | &name, &entry, &capability)) { |
| | 112 | /* iopl_device_port is locked and active */ |
| | 113 | if (capability[space->server_id] & MACH_PORT_TYPE_SEND) |
| | 114 | has_rights = TRUE; |
| | 115 | ip_unlock(iopl_device_port); |
| | 116 | } |
| | 117 | |
| | 118 | is_write_unlock(space); |
| | 119 | if (!has_rights) { |
| | 120 | return EM_IO_ERROR; |
| | 121 | } |
| | 122 | } |
| | 123 | |
| | 124 | /* |
| | 125 | * Map the IOPL port set into the thread. |
| | 126 | */ |
| | 127 | |
| | 128 | if (i386_io_port_add(thread, iopl_device) |
| | 129 | != KERN_SUCCESS) |
| | 130 | return EM_IO_ERROR; |
| | 131 | |
| | 132 | /* |
| | 133 | * Make the thread use its IO_TSS to get the IO permissions; |
| | 134 | * it may not have had one before this. |
| | 135 | */ |
| | 136 | act_machine_switch_pcb(thread->top_act); |
| | 137 | |
| | 138 | return EM_IO_RETRY; |
| | 139 | #endif |
| | 140 | } |
projects / apple / xnu.git / blame_incremental