FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/io_emulate.c

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * @OSF_COPYRIGHT@
     */
    /* 
     * Mach Operating System
     * Copyright (c) 1991,1990 Carnegie Mellon University
     * All Rights Reserved.
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     */
    
    #include <platforms.h>
    #include <cpus.h>
    #include <mach/boolean.h>
    #include <mach/port.h>
    #include <kern/thread.h>
    #include <kern/task.h>
    
    #include <ipc/ipc_port.h>
    #include <ipc/ipc_space.h>
    #include <ipc/ipc_right.h>
    #include <ipc/ipc_object.h>
    #include <ipc/ipc_entry.h>
    
    #include <i386/thread.h>
    #include <i386/io_port.h>
    #include <i386/io_emulate.h>
    #include <i386/iopb_entries.h>
    
    int
    emulate_io(
            struct i386_saved_state *regs,
            int                     opcode,
            int                     io_port)
    {
    #if 1
            /* At the moment, we are not allowing I/O emulation 
             *
             * FIXME - this should probably change due to 
             * the Window Server's need to map I/O ports into its space.
             */
    
            return EM_IO_ERROR;
    #else
            thread_t        thread = current_thread();
            at386_io_lock_state();
    
            if (iopl_emulate(regs, opcode, io_port))
                return EM_IO_DONE;
    
            if (iopb_check_mapping(thread, iopl_device))
                return EM_IO_ERROR;
    
            /*
             *      Check for send rights to the IOPL device port.
            */
           if (iopl_device_port == IP_NULL)
               return EM_IO_ERROR;
           {
               ipc_space_t space = current_space();
               mach_port_name_t    name;
               ipc_entry_t entry;
               boolean_t   has_rights = FALSE;
               ipc_entry_bits_t *capability;
   
               is_write_lock(space);
               assert(space->is_active);
   
               if (ipc_right_reverse(space, (ipc_object_t) iopl_device_port,
                                     &name, &entry, &capability)) {
                   /* iopl_device_port is locked and active */
                   if (capability[space->server_id] & MACH_PORT_TYPE_SEND)
                       has_rights = TRUE;
                   ip_unlock(iopl_device_port);
               }
   
               is_write_unlock(space);
               if (!has_rights) {
                   return EM_IO_ERROR;
               }
           }
   
           /*
            * Map the IOPL port set into the thread.
            */
   
           if (i386_io_port_add(thread, iopl_device)
               != KERN_SUCCESS) 
                   return EM_IO_ERROR;
   
           /*
            * Make the thread use its IO_TSS to get the IO permissions;
            * it may not have had one before this.
            */
           act_machine_switch_pcb(thread->top_act);
   
           return EM_IO_RETRY;
   #endif
   }

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