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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: * 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 [email protected]
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: }
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