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/*
* 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 <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 <device/dev_hdr.h>
#include <i386/thread.h>
#include <i386/io_port.h>
#include <i386/io_emulate.h>
extern ipc_port_t iopl_device_port;
extern mach_device_t iopl_device;
int
emulate_io(regs, opcode, io_port)
struct i386_saved_state *regs;
int opcode;
int io_port;
{
thread_t thread = current_thread();
#if AT386
if (iopl_emulate(regs, opcode, io_port))
return EM_IO_DONE;
#endif /* AT386 */
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_t name;
ipc_entry_t entry;
boolean_t has_rights = FALSE;
is_write_lock(space);
assert(space->is_active);
if (ipc_right_reverse(space, (ipc_object_t) iopl_device_port,
&name, &entry)) {
/* iopl_device_port is locked and active */
if (entry->ie_bits & 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.
*/
switch_ktss(thread->pcb);
return EM_IO_RETRY;
}
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