The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        io_emulate.c,v $
   29  * Revision 2.6  92/01/03  20:06:54  dbg
   30  *      Move AT-bus IO port emulation to i386at/iopl.c.
   31  *      [92/01/02            dbg]
   32  * 
   33  *      Rewrite to map IO ports into 'faulting' thread.
   34  *      Move actual instruction decoding to trap.c.
   35  *      Emulate certain IO ports for AT bus machines.
   36  *      [91/11/09            dbg]
   37  * 
   38  * Revision 2.5  91/05/14  16:09:24  mrt
   39  *      Correcting copyright
   40  * 
   41  * Revision 2.4  91/02/05  17:12:27  mrt
   42  *      Changed to new Mach copyright
   43  *      [91/02/01  17:35:06  mrt]
   44  * 
   45  * Revision 2.3  90/06/02  14:48:35  rpd
   46  *      Converted to new IPC.
   47  *      [90/06/01            rpd]
   48  * 
   49  * Revision 2.2  90/05/21  13:26:32  dbg
   50  *      Created.
   51  *      [90/05/09            dbg]
   52  * 
   53  */
   54 #include <platforms.h>
   55 
   56 #include <mach/boolean.h>
   57 #include <mach/port.h>
   58 #include <kern/thread.h>
   59 #include <kern/task.h>
   60 
   61 #include <ipc/ipc_port.h>
   62 #include <ipc/ipc_space.h>
   63 #include <ipc/ipc_right.h>
   64 #include <ipc/ipc_object.h>
   65 #include <ipc/ipc_entry.h>
   66 
   67 #include <device/dev_hdr.h>
   68 
   69 #include <i386/thread.h>
   70 #include <i386/io_port.h>
   71 #include <i386/io_emulate.h>
   72 
   73 extern ipc_port_t       iopl_device_port;
   74 extern device_t         iopl_device;
   75 
   76 int
   77 emulate_io(regs, opcode, io_port)
   78         struct i386_saved_state *regs;
   79         int     opcode;
   80         int     io_port;
   81 {
   82         thread_t        thread = current_thread();
   83 
   84 #if     AT386
   85         if (iopl_emulate(regs, opcode, io_port))
   86             return EM_IO_DONE;
   87 #endif  /* AT386 */
   88 
   89         if (iopb_check_mapping(thread, iopl_device))
   90             return EM_IO_ERROR;
   91 
   92         /*
   93          *      Check for send rights to the IOPL device port.
   94          */
   95         if (iopl_device_port == IP_NULL)
   96             return EM_IO_ERROR;
   97         {
   98             ipc_space_t space = current_space();
   99             mach_port_t name;
  100             ipc_entry_t entry;
  101             boolean_t   has_rights = FALSE;
  102 
  103             is_write_lock(space);
  104             assert(space->is_active);
  105 
  106             if (ipc_right_reverse(space, (ipc_object_t) iopl_device_port,
  107                                   &name, &entry)) {
  108                 /* iopl_device_port is locked and active */
  109                 if (entry->ie_bits & MACH_PORT_TYPE_SEND)
  110                     has_rights = TRUE;
  111                 ip_unlock(iopl_device_port);
  112             }
  113 
  114             is_write_unlock(space);
  115             if (!has_rights) {
  116                 return EM_IO_ERROR;
  117             }
  118         }
  119 
  120 
  121         /*
  122          * Map the IOPL port set into the thread.
  123          */
  124 
  125         if (i386_io_port_add(thread, iopl_device)
  126                 != KERN_SUCCESS)
  127             return EM_IO_ERROR;
  128 
  129         /*
  130          * Make the thread use its IO_TSS to get the IO permissions;
  131          * it may not have had one before this.
  132          */
  133         switch_ktss(thread->pcb);
  134 
  135         return EM_IO_RETRY;
  136 }

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