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Annotation of XNU/osfmk/i386/io_emulate.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:  * 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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