Source to osfmk/kern/ipc_host.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 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) 1991,1990,1989,1988 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  [email protected]
 *  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.
 */
/*
 */

/*
 *	kern/ipc_host.c
 *
 *	Routines to implement host ports.
 */
#include <mach/message.h>
#include <mach/mach_traps.h>
#include <mach/mach_host_server.h>
#include <kern/host.h>
#include <kern/processor.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <kern/ipc_host.h>
#include <kern/ipc_kobject.h>
#include <kern/misc_protos.h>
#include <kern/spl.h>
#include <ipc/ipc_port.h>
#include <ipc/ipc_space.h>

/*
 * Forward declarations
 */

void
ipc_processor_terminate(
	processor_t	processor);

void
ipc_processor_disable(
	processor_t	processor);

boolean_t
ref_pset_port_locked(
	ipc_port_t port, boolean_t matchn, processor_set_t *ppset);

/*
 *	ipc_host_init: set up various things.
 */

void ipc_host_init(void)
{
	ipc_port_t	port;
	/*
	 *	Allocate and set up the two host ports.
	 */
	port = ipc_port_alloc_kernel();
	if (port == IP_NULL)
		panic("ipc_host_init");

	ipc_kobject_set(port, (ipc_kobject_t) &realhost, IKOT_HOST);
	realhost.host_self = port;

	port = ipc_port_alloc_kernel();
	if (port == IP_NULL)
		panic("ipc_host_init");

	ipc_kobject_set(port, (ipc_kobject_t) &realhost, IKOT_HOST_PRIV);
	realhost.host_priv_self = port;

	port = ipc_port_alloc_kernel();
	if (port == IP_NULL)
		panic("ipc_host_init");

	ipc_kobject_set(port, (ipc_kobject_t) &realhost, IKOT_HOST_SECURITY);
	realhost.host_security_self = port;
	/*
	 *	Set up ipc for default processor set.
	 */
	ipc_pset_init(&default_pset);
	ipc_pset_enable(&default_pset);

	/*
	 *	And for master processor
	 */
	ipc_processor_init(master_processor);
	ipc_processor_enable(master_processor);
}

/*
 *	Routine:	mach_host_self [mach trap]
 *	Purpose:
 *		Give the caller send rights for his own host port.
 *	Conditions:
 *		Nothing locked.
 *	Returns:
 *		MACH_PORT_NULL if there are any resource failures
 *		or other errors.
 */

mach_port_name_t
mach_host_self(void)
{
	ipc_port_t sright;

	sright = ipc_port_make_send(realhost.host_self);
	return ipc_port_copyout_send(sright, current_space());
}

/*
 *	ipc_processor_init:
 *
 *	Initialize ipc access to processor by allocating port.
 */

void
ipc_processor_init(
	processor_t	processor)
{
	ipc_port_t	port;

	port = ipc_port_alloc_kernel();
	if (port == IP_NULL)
		panic("ipc_processor_init");
	processor->processor_self = port;
}

/*
 *	ipc_processor_enable:
 *
 *	Enable ipc control of processor by setting port object.
 */
void
ipc_processor_enable(
	processor_t	processor)
{
	ipc_port_t	myport;

	myport = processor->processor_self;
	ipc_kobject_set(myport, (ipc_kobject_t) processor, IKOT_PROCESSOR);
}

/*
 *	ipc_processor_disable:
 *
 *	Disable ipc control of processor by clearing port object.
 */
void
ipc_processor_disable(
	processor_t	processor)
{
	ipc_port_t	myport;

	myport = processor->processor_self;
	if (myport == IP_NULL)
		return;
	ipc_kobject_set(myport, IKO_NULL, IKOT_NONE);
}

/*
 *	ipc_processor_terminate:
 *
 *	Processor is off-line.  Destroy ipc control port.
 */
void
ipc_processor_terminate(
	processor_t	processor)
{
	ipc_port_t	myport;
	spl_t		s;

	s = splsched();
	processor_lock(processor);
	myport = processor->processor_self;
	if (myport == IP_NULL) {
		processor_unlock(processor);
		splx(s);
		return;
	}

	processor->processor_self = IP_NULL;
	processor_unlock(processor);
	splx(s);

	ipc_port_dealloc_kernel(myport);
}
	
/*
 *	ipc_pset_init:
 *
 *	Initialize ipc control of a processor set by allocating its ports.
 */

void
ipc_pset_init(
	processor_set_t		pset)
{
	ipc_port_t	port;

	port = ipc_port_alloc_kernel();
	if (port == IP_NULL)
		panic("ipc_pset_init");
	pset->pset_self = port;

	port = ipc_port_alloc_kernel();
	if (port == IP_NULL)
		panic("ipc_pset_init");
	pset->pset_name_self = port;
}

/*
 *	ipc_pset_enable:
 *
 *	Enable ipc access to a processor set.
 */
void
ipc_pset_enable(
	processor_set_t		pset)
{
	pset_lock(pset);
	if (pset->active) {
		ipc_kobject_set(pset->pset_self,
				(ipc_kobject_t) pset, IKOT_PSET);
		ipc_kobject_set(pset->pset_name_self,
				(ipc_kobject_t) pset, IKOT_PSET_NAME);
		pset->ref_count += 2;
	}
	pset_unlock(pset);
}

/*
 *	ipc_pset_disable:
 *
 *	Disable ipc access to a processor set by clearing the port objects.
 *	Caller must hold pset lock and a reference to the pset.  Ok to
 *	just decrement pset reference count as a result.
 */
void
ipc_pset_disable(
	processor_set_t		pset)
{
	ipc_kobject_set(pset->pset_self, IKO_NULL, IKOT_NONE);
	ipc_kobject_set(pset->pset_name_self, IKO_NULL, IKOT_NONE);
	pset->ref_count -= 2;
}

/*
 *	ipc_pset_terminate:
 *
 *	Processor set is dead.  Deallocate the ipc control structures.
 */
void
ipc_pset_terminate(
	processor_set_t		pset)
{
	ipc_port_dealloc_kernel(pset->pset_self);
	ipc_port_dealloc_kernel(pset->pset_name_self);
}

/*
 *	processor_set_default, processor_set_default_priv:
 *
 *	Return ports for manipulating default_processor set.  MiG code
 *	differentiates between these two routines.
 */
kern_return_t
processor_set_default(
	host_t			host,
	processor_set_t		*pset)
{
	if (host == HOST_NULL)
		return(KERN_INVALID_ARGUMENT);

	*pset = &default_pset;
	pset_reference(*pset);
	return(KERN_SUCCESS);
}

/*
 *	Routine:	convert_port_to_host
 *	Purpose:
 *		Convert from a port to a host.
 *		Doesn't consume the port ref; the host produced may be null.
 *	Conditions:
 *		Nothing locked.
 */

host_t
convert_port_to_host(
	ipc_port_t	port)
{
	host_t host = HOST_NULL;

	if (IP_VALID(port)) {
		ip_lock(port);
		if (ip_active(port) &&
		    ((ip_kotype(port) == IKOT_HOST) ||
		     (ip_kotype(port) == IKOT_HOST_PRIV) 
		     ))
			host = (host_t) port->ip_kobject;
		ip_unlock(port);
	}

	return host;
}

/*
 *	Routine:	convert_port_to_host_priv
 *	Purpose:
 *		Convert from a port to a host.
 *		Doesn't consume the port ref; the host produced may be null.
 *	Conditions:
 *		Nothing locked.
 */

host_t
convert_port_to_host_priv(
	ipc_port_t	port)
{
	host_t host = HOST_NULL;

	if (IP_VALID(port)) {
		ip_lock(port);
		if (ip_active(port) &&
		    (ip_kotype(port) == IKOT_HOST_PRIV))
			host = (host_t) port->ip_kobject;
		ip_unlock(port);
	}

	return host;
}

/*
 *	Routine:	convert_port_to_processor
 *	Purpose:
 *		Convert from a port to a processor.
 *		Doesn't consume the port ref;
 *		the processor produced may be null.
 *	Conditions:
 *		Nothing locked.
 */

processor_t
convert_port_to_processor(
	ipc_port_t	port)
{
	processor_t processor = PROCESSOR_NULL;

	if (IP_VALID(port)) {
		ip_lock(port);
		if (ip_active(port) &&
		    (ip_kotype(port) == IKOT_PROCESSOR))
			processor = (processor_t) port->ip_kobject;
		ip_unlock(port);
	}

	return processor;
}

/*
 *	Routine:	convert_port_to_pset
 *	Purpose:
 *		Convert from a port to a pset.
 *		Doesn't consume the port ref; produces a pset ref,
 *		which may be null.
 *	Conditions:
 *		Nothing locked.
 */

processor_set_t
convert_port_to_pset(
	ipc_port_t	port)
{
	boolean_t r;
	processor_set_t pset = PROCESSOR_SET_NULL;

	r = FALSE;
	while (!r && IP_VALID(port)) {
		ip_lock(port);
		r = ref_pset_port_locked(port, FALSE, &pset);
		/* port unlocked */
	}
	return pset;
}

/*
 *	Routine:	convert_port_to_pset_name
 *	Purpose:
 *		Convert from a port to a pset.
 *		Doesn't consume the port ref; produces a pset ref,
 *		which may be null.
 *	Conditions:
 *		Nothing locked.
 */

processor_set_name_t
convert_port_to_pset_name(
	ipc_port_t	port)
{
	boolean_t r;
	processor_set_t pset = PROCESSOR_SET_NULL;

	r = FALSE;
	while (!r && IP_VALID(port)) {
		ip_lock(port);
		r = ref_pset_port_locked(port, TRUE, &pset);
		/* port unlocked */
	}
	return pset;
}

boolean_t
ref_pset_port_locked(ipc_port_t port, boolean_t matchn, processor_set_t *ppset)
{
	processor_set_t pset;

	pset = PROCESSOR_SET_NULL;
	if (ip_active(port) &&
		((ip_kotype(port) == IKOT_PSET) ||
		 (matchn && (ip_kotype(port) == IKOT_PSET_NAME)))) {
		pset = (processor_set_t) port->ip_kobject;
		if (!pset_lock_try(pset)) {
			ip_unlock(port);
			mutex_pause();
			return (FALSE);
		}
		pset->ref_count++;
		pset_unlock(pset);
	}
	*ppset = pset;
	ip_unlock(port);
	return (TRUE);
}

/*
 *	Routine:	convert_host_to_port
 *	Purpose:
 *		Convert from a host to a port.
 *		Produces a naked send right which may be invalid.
 *	Conditions:
 *		Nothing locked.
 */

ipc_port_t
convert_host_to_port(
	host_t		host)
{
	ipc_port_t port;

	port = ipc_port_make_send(host->host_self);

	return port;
}

/*
 *	Routine:	convert_processor_to_port
 *	Purpose:
 *		Convert from a processor to a port.
 *		Produces a naked send right which may be invalid.
 *	Conditions:
 *		Nothing locked.
 */

ipc_port_t
convert_processor_to_port(
	processor_t		processor)
{
	ipc_port_t port;
	spl_t	s;

	s = splsched();
	processor_lock(processor);

	if (processor->processor_self != IP_NULL)
		port = ipc_port_make_send(processor->processor_self);
	else
		port = IP_NULL;

	processor_unlock(processor);
	splx(s);

	return port;
}

/*
 *	Routine:	convert_pset_to_port
 *	Purpose:
 *		Convert from a pset to a port.
 *		Consumes a pset ref; produces a naked send right
 *		which may be invalid.
 *	Conditions:
 *		Nothing locked.
 */

ipc_port_t
convert_pset_to_port(
	processor_set_t		pset)
{
	ipc_port_t port;

	pset_lock(pset);
	if (pset->active)
		port = ipc_port_make_send(pset->pset_self);
	else
		port = IP_NULL;
	pset_unlock(pset);

	pset_deallocate(pset);
	return port;
}

/*
 *	Routine:	convert_pset_name_to_port
 *	Purpose:
 *		Convert from a pset to a port.
 *		Consumes a pset ref; produces a naked send right
 *		which may be invalid.
 *	Conditions:
 *		Nothing locked.
 */

ipc_port_t
convert_pset_name_to_port(
	processor_set_name_t		pset)
{
	ipc_port_t port;

	pset_lock(pset);
	if (pset->active)
		port = ipc_port_make_send(pset->pset_name_self);
	else
		port = IP_NULL;
	pset_unlock(pset);

	pset_deallocate(pset);
	return port;
}

/*
 *	Routine:	convert_port_to_host_security
 *	Purpose:
 *		Convert from a port to a host security.
 *		Doesn't consume the port ref; the port produced may be null.
 *	Conditions:
 *		Nothing locked.
 */

host_t
convert_port_to_host_security(
	ipc_port_t port)
{
	host_t host = HOST_NULL;

	if (IP_VALID(port)) {
		ip_lock(port);
		if (ip_active(port) &&
		    (ip_kotype(port) == IKOT_HOST_SECURITY))
			host = (host_t) port->ip_kobject;
		ip_unlock(port);
	}

	return host;
}