[apple/xnu.git] / osfmk / kern / machine.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) 1991,1990,1989,1988,1987 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.
 */
/*
 */
/*
 *	File:	kern/machine.c
 *	Author:	Avadis Tevanian, Jr.
 *	Date:	1987
 *
 *	Support for machine independent machine abstraction.
 */

#include <cpus.h>

#include <string.h>
#include <mach/boolean.h>
#include <mach/kern_return.h>
#include <mach/mach_types.h>
#include <mach/machine.h>
#include <mach/host_info.h>
#include <mach/host_reboot.h>
#include <kern/counters.h>
#include <kern/cpu_data.h>
#include <kern/ipc_host.h>
#include <kern/host.h>
#include <kern/lock.h>
#include <kern/machine.h>
#include <kern/processor.h>
#include <kern/queue.h>
#include <kern/sched.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <kern/thread_swap.h>
#include <kern/misc_protos.h>

#include <kern/mk_sp.h>

/*
 *	Exported variables:
 */

struct machine_info	machine_info;
struct machine_slot	machine_slot[NCPUS];

static queue_head_t			processor_action_queue;
static boolean_t			processor_action_active;
static thread_call_t		processor_action_call;
static thread_call_data_t	processor_action_call_data;
decl_simple_lock_data(static,processor_action_lock)

thread_t		machine_wake_thread;

/* Forwards */
processor_set_t	processor_request_action(
					processor_t			processor,
					processor_set_t		new_pset);

void			processor_doaction(
					processor_t			processor);

void			processor_doshutdown(
					processor_t			processor);

/*
 *	cpu_up:
 *
 * Flag specified cpu as up and running.  Called when a processor comes
 * online.
 */
void
cpu_up(
	int		cpu)
{
	processor_t				processor = cpu_to_processor(cpu);
	processor_set_t			pset = &default_pset;
	struct machine_slot		*ms;
	spl_t					s;
	
	/*
	 * Just twiddle our thumbs; we've got nothing better to do
	 * yet, anyway.
	 */
	while (!simple_lock_try(&pset->processors_lock))
		continue;

	s = splsched();
	processor_lock(processor);
	init_ast_check(processor);
	ms = &machine_slot[cpu];
	ms->running = TRUE;
	machine_info.avail_cpus++;
	pset_add_processor(pset, processor);
	simple_lock(&pset->sched_lock);
	enqueue_tail(&pset->active_queue, (queue_entry_t)processor);
	processor->state = PROCESSOR_RUNNING;
	simple_unlock(&pset->sched_lock);
	processor_unlock(processor);
	splx(s);

	simple_unlock(&pset->processors_lock);
}

/*
 *	cpu_down:
 *
 *	Flag specified cpu as down.  Called when a processor is about to
 *	go offline.
 */
void
cpu_down(
	int		cpu)
{
	processor_t				processor;
	struct machine_slot		*ms;
	spl_t					s;

	processor = cpu_to_processor(cpu);

	s = splsched();
	processor_lock(processor);
	ms = &machine_slot[cpu];
	ms->running = FALSE;
	machine_info.avail_cpus--;
	/*
	 *	processor has already been removed from pset.
	 */
	processor->processor_set_next = PROCESSOR_SET_NULL;
	processor->state = PROCESSOR_OFF_LINE;
	processor_unlock(processor);
	splx(s);
}

kern_return_t
host_reboot(
	host_priv_t			host_priv,
	int				options)
{
	if (host_priv == HOST_PRIV_NULL)
		return (KERN_INVALID_HOST);

	assert(host_priv == &realhost);

	if (options & HOST_REBOOT_DEBUGGER) {
		Debugger("Debugger");
	}
	else
		halt_all_cpus(!(options & HOST_REBOOT_HALT));

	return (KERN_SUCCESS);
}

/*
 * processor_request_action: 
 *
 * Common internals of processor_assign and processor_shutdown.  
 * If new_pset is null, this is a shutdown, else it's an assign 
 * and caller must donate a reference.  
 * For assign operations, it returns an old pset that must be deallocated 
 * if it's not NULL.  
 * For shutdown operations, it always returns PROCESSOR_SET_NULL.
 */
processor_set_t
processor_request_action(
	processor_t			processor,
	processor_set_t		new_pset)
{
	processor_set_t		pset, old_pset;

	/*
	 * Processor must be in a processor set.  Must lock its idle lock to
	 * get at processor state.
	 */
	pset = processor->processor_set;
	simple_lock(&pset->sched_lock);

	/*
	 * If the processor is dispatching, let it finish - it will set its
	 * state to running very soon.
	 */
	while (*(volatile int *)&processor->state == PROCESSOR_DISPATCHING) {
		simple_unlock(&pset->sched_lock);

		simple_lock(&pset->sched_lock);
	}

	assert(	processor->state == PROCESSOR_IDLE		||
			processor->state == PROCESSOR_RUNNING	||
			processor->state == PROCESSOR_ASSIGN	);

	/*
	 * Now lock the action queue and do the dirty work.
	 */
	simple_lock(&processor_action_lock);

	if (processor->state == PROCESSOR_IDLE) {
		remqueue(&pset->idle_queue, (queue_entry_t)processor);
		pset->idle_count--;
	}
	else
	if (processor->state == PROCESSOR_RUNNING)
		remqueue(&pset->active_queue, (queue_entry_t)processor);

	if (processor->state != PROCESSOR_ASSIGN)
		enqueue_tail(&processor_action_queue, (queue_entry_t)processor);

	/*
	 * And ask the action_thread to do the work.
	 */
	if (new_pset != PROCESSOR_SET_NULL) {
		processor->state = PROCESSOR_ASSIGN;
		old_pset = processor->processor_set_next;
		processor->processor_set_next = new_pset;
	}
	else {
		processor->state = PROCESSOR_SHUTDOWN;
		old_pset = PROCESSOR_SET_NULL;
	}

	simple_unlock(&pset->sched_lock);

	if (processor_action_active) {
		simple_unlock(&processor_action_lock);

		return (old_pset);
	}

	processor_action_active = TRUE;
	simple_unlock(&processor_action_lock);

	processor_unlock(processor);

	thread_call_enter(processor_action_call);
	processor_lock(processor);

	return (old_pset);
}

kern_return_t
processor_assign(
	processor_t			processor,
	processor_set_t		new_pset,
	boolean_t			wait)
{
#ifdef	lint
	processor++; new_pset++; wait++;
#endif	/* lint */
	return (KERN_FAILURE);
}

/*
 *	processor_shutdown() queues a processor up for shutdown.
 *	Any assignment in progress is overriden.
 */
kern_return_t
processor_shutdown(
	processor_t		processor)
{
	spl_t s;

	s = splsched();
	processor_lock(processor);
	if (	processor->state == PROCESSOR_OFF_LINE	||
			processor->state == PROCESSOR_SHUTDOWN	) {
		/*
		 * Already shutdown or being shutdown -- nothing to do.
		 */
		processor_unlock(processor);
		splx(s);

		return (KERN_SUCCESS);
	}

	processor_request_action(processor, PROCESSOR_SET_NULL);

	assert_wait((event_t)processor, THREAD_UNINT);

    processor_unlock(processor);
	splx(s);

	thread_block(THREAD_CONTINUE_NULL);

	return (KERN_SUCCESS);
}

/*
 *	processor_action() shuts down processors or changes their assignment.
 */
static void
_processor_action(
	thread_call_param_t		p0,
	thread_call_param_t		p1)
{
	register processor_t	processor;
	spl_t s;

	s = splsched();
	simple_lock(&processor_action_lock);

	while (!queue_empty(&processor_action_queue)) {
		processor = (processor_t)dequeue_head(&processor_action_queue);
		simple_unlock(&processor_action_lock);
		splx(s);

		processor_doaction(processor);

		s = splsched();
		simple_lock(&processor_action_lock);
	}

	processor_action_active = FALSE;
	simple_unlock(&processor_action_lock);
	splx(s);
}

void
processor_action(void)
{
	queue_init(&processor_action_queue);
	simple_lock_init(&processor_action_lock, ETAP_THREAD_ACTION); 
	processor_action_active = FALSE;

	thread_call_setup(&processor_action_call_data, _processor_action, NULL);
	processor_action_call = &processor_action_call_data;
}

/*
 *	processor_doaction actually does the shutdown.  The trick here
 *	is to schedule ourselves onto a cpu and then save our
 *	context back into the runqs before taking out the cpu.
 */
void
processor_doaction(
	processor_t					processor)
{
	thread_t			self = current_thread();
	processor_set_t		pset;
	thread_t			old_thread;
	spl_t				s;

	/*
	 *	Get onto the processor to shutdown
	 */
	thread_bind(self, processor);
	thread_block(THREAD_CONTINUE_NULL);

	pset = processor->processor_set;
	simple_lock(&pset->processors_lock);

	if (pset->processor_count == 1) {
		thread_t		thread;
		extern void		start_cpu_thread(void);

		simple_unlock(&pset->processors_lock);

		/*
		 * Create the thread, and point it at the routine.
		 */
		thread = kernel_thread_with_priority(
									kernel_task, MAXPRI_KERNEL,
										start_cpu_thread, TRUE, FALSE);

		disable_preemption();

		s = splsched();
		thread_lock(thread);
		machine_wake_thread = thread;
		thread_go_locked(thread, THREAD_AWAKENED);
		(void)rem_runq(thread);
		thread_unlock(thread);
		splx(s);

		simple_lock(&pset->processors_lock);
		enable_preemption();
	}

	s = splsched();
	processor_lock(processor);

	/*
	 *	Do shutdown, make sure we live when processor dies.
	 */
	if (processor->state != PROCESSOR_SHUTDOWN) {
		panic("action_thread -- bad processor state");
	}

	pset_remove_processor(pset, processor);
	processor_unlock(processor);
	simple_unlock(&pset->processors_lock);

	/*
	 *	Clean up.
	 */
	thread_bind(self, PROCESSOR_NULL);
	self->continuation = 0;
	old_thread = switch_to_shutdown_context(self,
									processor_doshutdown, processor);
	if (processor != current_processor())
		timer_call_shutdown(processor);
	thread_dispatch(old_thread);
	thread_wakeup((event_t)processor);
	splx(s);
}

/*
 *	Actually do the processor shutdown.  This is called at splsched,
 *	running on the processor's shutdown stack.
 */

void
processor_doshutdown(
	processor_t		processor)
{
	register int	cpu = processor->slot_num;

	timer_call_cancel(&processor->quantum_timer);
	thread_dispatch(current_thread());
	timer_switch(&kernel_timer[cpu]);

	/*
	 *	OK, now exit this cpu.
	 */
	PMAP_DEACTIVATE_KERNEL(cpu);
	thread_machine_set_current(processor->idle_thread);
	cpu_down(cpu);
	cpu_sleep();
	panic("zombie processor");
	/*NOTREACHED*/
}

kern_return_t
host_get_boot_info(
        host_priv_t         host_priv,
        kernel_boot_info_t  boot_info)
{
	char *src = "";
	extern char *machine_boot_info(
				kernel_boot_info_t	boot_info,
				vm_size_t			buf_len);

	if (host_priv == HOST_PRIV_NULL)
		return (KERN_INVALID_HOST);

	assert(host_priv == &realhost);

	/*
	 * Copy first operator string terminated by '\0' followed by
	 *	standardized strings generated from boot string.
	 */
	src = machine_boot_info(boot_info, KERNEL_BOOT_INFO_MAX);
	if (src != boot_info)
		(void) strncpy(boot_info, src, KERNEL_BOOT_INFO_MAX);

	return (KERN_SUCCESS);
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37 A	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
	7	*
	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* @OSF_COPYRIGHT@
	27	*/
	28	/*
	29	* Mach Operating System
	30	* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
	31	* All Rights Reserved.
	32	*
	33	* Permission to use, copy, modify and distribute this software and its
	34	* documentation is hereby granted, provided that both the copyright
	35	* notice and this permission notice appear in all copies of the
	36	* software, derivative works or modified versions, and any portions
	37	* thereof, and that both notices appear in supporting documentation.
	38	*
	39	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	40	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	41	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	42	*
	43	* Carnegie Mellon requests users of this software to return to
	44	*
	45	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	46	* School of Computer Science
	47	* Carnegie Mellon University
	48	* Pittsburgh PA 15213-3890
	49	*
	50	* any improvements or extensions that they make and grant Carnegie Mellon
	51	* the rights to redistribute these changes.
	52	*/
	53	/*
	54	*/
	55	/*
	56	* File: kern/machine.c
	57	* Author: Avadis Tevanian, Jr.
	58	* Date: 1987
	59	*
	60	* Support for machine independent machine abstraction.
	61	*/
	62
	63	#include <cpus.h>
	64
	65	#include <string.h>
	66	#include <mach/boolean.h>
	67	#include <mach/kern_return.h>
	68	#include <mach/mach_types.h>
	69	#include <mach/machine.h>
	70	#include <mach/host_info.h>
	71	#include <mach/host_reboot.h>
	72	#include <kern/counters.h>
	73	#include <kern/cpu_data.h>
	74	#include <kern/ipc_host.h>
	75	#include <kern/host.h>
	76	#include <kern/lock.h>
	77	#include <kern/machine.h>
	78	#include <kern/processor.h>
	79	#include <kern/queue.h>
	80	#include <kern/sched.h>
	81	#include <kern/task.h>
	82	#include <kern/thread.h>
	83	#include <kern/thread_swap.h>
	84	#include <kern/misc_protos.h>
	85
0b4e3aa0	86	#include <kern/mk_sp.h>
1c79356b A	87
	88	/*
	89	* Exported variables:
	90	*/
	91
	92	struct machine_info machine_info;
	93	struct machine_slot machine_slot[NCPUS];
	94
	95	static queue_head_t processor_action_queue;
	96	static boolean_t processor_action_active;
	97	static thread_call_t processor_action_call;
	98	static thread_call_data_t processor_action_call_data;
	99	decl_simple_lock_data(static,processor_action_lock)
	100
	101	thread_t machine_wake_thread;
	102
	103	/* Forwards */
	104	processor_set_t processor_request_action(
	105	processor_t processor,
	106	processor_set_t new_pset);
	107
	108	void processor_doaction(
	109	processor_t processor);
	110
	111	void processor_doshutdown(
	112	processor_t processor);
	113
	114	/*
	115	* cpu_up:
	116	*
	117	* Flag specified cpu as up and running. Called when a processor comes
	118	* online.
	119	*/
	120	void
	121	cpu_up(
	122	int cpu)
	123	{
	124	processor_t processor = cpu_to_processor(cpu);
9bccf70c	125	processor_set_t pset = &default_pset;
1c79356b A	126	struct machine_slot *ms;
	127	spl_t s;
	128
	129	/*
	130	* Just twiddle our thumbs; we've got nothing better to do
	131	* yet, anyway.
	132	*/
9bccf70c	133	while (!simple_lock_try(&pset->processors_lock))
1c79356b A	134	continue;
	135
	136	s = splsched();
	137	processor_lock(processor);
	138	init_ast_check(processor);
	139	ms = &machine_slot[cpu];
	140	ms->running = TRUE;
	141	machine_info.avail_cpus++;
9bccf70c A	142	pset_add_processor(pset, processor);
	143	simple_lock(&pset->sched_lock);
	144	enqueue_tail(&pset->active_queue, (queue_entry_t)processor);
1c79356b	145	processor->state = PROCESSOR_RUNNING;
9bccf70c	146	simple_unlock(&pset->sched_lock);
1c79356b A	147	processor_unlock(processor);
	148	splx(s);
	149
9bccf70c	150	simple_unlock(&pset->processors_lock);
1c79356b A	151	}
	152
	153	/*
	154	* cpu_down:
	155	*
	156	* Flag specified cpu as down. Called when a processor is about to
	157	* go offline.
	158	*/
	159	void
	160	cpu_down(
	161	int cpu)
	162	{
	163	processor_t processor;
	164	struct machine_slot *ms;
	165	spl_t s;
	166
	167	processor = cpu_to_processor(cpu);
	168
	169	s = splsched();
	170	processor_lock(processor);
	171	ms = &machine_slot[cpu];
	172	ms->running = FALSE;
	173	machine_info.avail_cpus--;
	174	/*
	175	* processor has already been removed from pset.
	176	*/
	177	processor->processor_set_next = PROCESSOR_SET_NULL;
	178	processor->state = PROCESSOR_OFF_LINE;
	179	processor_unlock(processor);
	180	splx(s);
	181	}
	182
	183	kern_return_t
	184	host_reboot(
	185	host_priv_t host_priv,
	186	int options)
	187	{
	188	if (host_priv == HOST_PRIV_NULL)
	189	return (KERN_INVALID_HOST);
	190
	191	assert(host_priv == &realhost);
	192
	193	if (options & HOST_REBOOT_DEBUGGER) {
	194	Debugger("Debugger");
	195	}
	196	else
	197	halt_all_cpus(!(options & HOST_REBOOT_HALT));
	198
	199	return (KERN_SUCCESS);
	200	}
	201
	202	/*
	203	* processor_request_action:
	204	*
	205	* Common internals of processor_assign and processor_shutdown.
	206	* If new_pset is null, this is a shutdown, else it's an assign
	207	* and caller must donate a reference.
	208	* For assign operations, it returns an old pset that must be deallocated
	209	* if it's not NULL.
	210	* For shutdown operations, it always returns PROCESSOR_SET_NULL.
	211	*/
	212	processor_set_t
	213	processor_request_action(
	214	processor_t processor,
215	processor_set_t new_pset)
216	{
9bccf70c	217	processor_set_t pset, old_pset;
1c79356b A	218
	219	/*
	220	* Processor must be in a processor set. Must lock its idle lock to
	221	* get at processor state.
	222	*/
	223	pset = processor->processor_set;
9bccf70c	224	simple_lock(&pset->sched_lock);
1c79356b A	225
	226	/*
	227	* If the processor is dispatching, let it finish - it will set its
	228	* state to running very soon.
	229	*/
	230	while ((volatile int )&processor->state == PROCESSOR_DISPATCHING) {
9bccf70c A	231	simple_unlock(&pset->sched_lock);
	232
	233	simple_lock(&pset->sched_lock);
1c79356b A	234	}
1c79356b A	235
9bccf70c A	236	assert( processor->state == PROCESSOR_IDLE \|\|
	237	processor->state == PROCESSOR_RUNNING \|\|
	238	processor->state == PROCESSOR_ASSIGN );
	239
1c79356b A	240	/*
	241	* Now lock the action queue and do the dirty work.
	242	*/
	243	simple_lock(&processor_action_lock);
	244
9bccf70c A	245	if (processor->state == PROCESSOR_IDLE) {
9bccf70c A	246	remqueue(&pset->idle_queue, (queue_entry_t)processor);
1c79356b	247	pset->idle_count--;
9bccf70c A	248	}
	249	else
	250	if (processor->state == PROCESSOR_RUNNING)
	251	remqueue(&pset->active_queue, (queue_entry_t)processor);
1c79356b	252
9bccf70c A	253	if (processor->state != PROCESSOR_ASSIGN)
9bccf70c A	254	enqueue_tail(&processor_action_queue, (queue_entry_t)processor);
1c79356b	255
9bccf70c A	256	/*
	257	* And ask the action_thread to do the work.
	258	*/
	259	if (new_pset != PROCESSOR_SET_NULL) {
	260	processor->state = PROCESSOR_ASSIGN;
	261	old_pset = processor->processor_set_next;
	262	processor->processor_set_next = new_pset;
	263	}
	264	else {
	265	processor->state = PROCESSOR_SHUTDOWN;
	266	old_pset = PROCESSOR_SET_NULL;
1c79356b A	267	}
1c79356b A	268
9bccf70c A	269	simple_unlock(&pset->sched_lock);
	270
	271	if (processor_action_active) {
1c79356b	272	simple_unlock(&processor_action_lock);
9bccf70c A	273
9bccf70c A	274	return (old_pset);
1c79356b A	275	}
1c79356b A	276
9bccf70c A	277	processor_action_active = TRUE;
	278	simple_unlock(&processor_action_lock);
	279
	280	processor_unlock(processor);
	281
	282	thread_call_enter(processor_action_call);
	283	processor_lock(processor);
	284
	285	return (old_pset);
1c79356b A	286	}
	287
	288	kern_return_t
	289	processor_assign(
	290	processor_t processor,
	291	processor_set_t new_pset,
	292	boolean_t wait)
	293	{
	294	#ifdef lint
	295	processor++; new_pset++; wait++;
	296	#endif /* lint */
	297	return (KERN_FAILURE);
	298	}
	299
	300	/*
	301	* processor_shutdown() queues a processor up for shutdown.
	302	* Any assignment in progress is overriden.
	303	*/
	304	kern_return_t
	305	processor_shutdown(
	306	processor_t processor)
	307	{
	308	spl_t s;
	309
	310	s = splsched();
	311	processor_lock(processor);
9bccf70c A	312	if ( processor->state == PROCESSOR_OFF_LINE \|\|
9bccf70c A	313	processor->state == PROCESSOR_SHUTDOWN ) {
1c79356b A	314	/*
	315	* Already shutdown or being shutdown -- nothing to do.
	316	*/
	317	processor_unlock(processor);
	318	splx(s);
	319
	320	return (KERN_SUCCESS);
	321	}
	322
9bccf70c	323	processor_request_action(processor, PROCESSOR_SET_NULL);
1c79356b A	324
	325	assert_wait((event_t)processor, THREAD_UNINT);
	326
	327	processor_unlock(processor);
	328	splx(s);
	329
9bccf70c	330	thread_block(THREAD_CONTINUE_NULL);
1c79356b A	331
	332	return (KERN_SUCCESS);
	333	}
	334
	335	/*
	336	* processor_action() shuts down processors or changes their assignment.
	337	*/
	338	static void
	339	_processor_action(
	340	thread_call_param_t p0,
	341	thread_call_param_t p1)
	342	{
	343	register processor_t processor;
	344	spl_t s;
	345
	346	s = splsched();
	347	simple_lock(&processor_action_lock);
	348
	349	while (!queue_empty(&processor_action_queue)) {
9bccf70c	350	processor = (processor_t)dequeue_head(&processor_action_queue);
1c79356b A	351	simple_unlock(&processor_action_lock);
	352	splx(s);
	353
	354	processor_doaction(processor);
	355
	356	s = splsched();
	357	simple_lock(&processor_action_lock);
	358	}
	359
	360	processor_action_active = FALSE;
	361	simple_unlock(&processor_action_lock);
	362	splx(s);
	363	}
	364
	365	void
	366	processor_action(void)
	367	{
	368	queue_init(&processor_action_queue);
	369	simple_lock_init(&processor_action_lock, ETAP_THREAD_ACTION);
	370	processor_action_active = FALSE;
	371
	372	thread_call_setup(&processor_action_call_data, _processor_action, NULL);
	373	processor_action_call = &processor_action_call_data;
	374	}
	375
	376	/*
	377	* processor_doaction actually does the shutdown. The trick here
	378	* is to schedule ourselves onto a cpu and then save our
	379	* context back into the runqs before taking out the cpu.
	380	*/
	381	void
	382	processor_doaction(
	383	processor_t processor)
	384	{
	385	thread_t self = current_thread();
	386	processor_set_t pset;
	387	thread_t old_thread;
	388	spl_t s;
	389
	390	/*
	391	* Get onto the processor to shutdown
	392	*/
	393	thread_bind(self, processor);
9bccf70c	394	thread_block(THREAD_CONTINUE_NULL);
1c79356b A	395
	396	pset = processor->processor_set;
	397	simple_lock(&pset->processors_lock);
	398
	399	if (pset->processor_count == 1) {
	400	thread_t thread;
1c79356b A	401	extern void start_cpu_thread(void);
	402
	403	simple_unlock(&pset->processors_lock);
	404
	405	/*
	406	* Create the thread, and point it at the routine.
	407	*/
0b4e3aa0 A	408	thread = kernel_thread_with_priority(
	409	kernel_task, MAXPRI_KERNEL,
	410	start_cpu_thread, TRUE, FALSE);
1c79356b A	411
	412	disable_preemption();
	413
	414	s = splsched();
	415	thread_lock(thread);
1c79356b	416	machine_wake_thread = thread;
9bccf70c A	417	thread_go_locked(thread, THREAD_AWAKENED);
9bccf70c A	418	(void)rem_runq(thread);
1c79356b A	419	thread_unlock(thread);
	420	splx(s);
	421
	422	simple_lock(&pset->processors_lock);
	423	enable_preemption();
	424	}
	425
	426	s = splsched();
	427	processor_lock(processor);
	428
	429	/*
	430	* Do shutdown, make sure we live when processor dies.
	431	*/
	432	if (processor->state != PROCESSOR_SHUTDOWN) {
	433	panic("action_thread -- bad processor state");
	434	}
	435
	436	pset_remove_processor(pset, processor);
	437	processor_unlock(processor);
	438	simple_unlock(&pset->processors_lock);
	439
	440	/*
	441	* Clean up.
	442	*/
	443	thread_bind(self, PROCESSOR_NULL);
	444	self->continuation = 0;
	445	old_thread = switch_to_shutdown_context(self,
	446	processor_doshutdown, processor);
9bccf70c A	447	if (processor != current_processor())
9bccf70c A	448	timer_call_shutdown(processor);
1c79356b A	449	thread_dispatch(old_thread);
	450	thread_wakeup((event_t)processor);
	451	splx(s);
	452	}
	453
	454	/*
	455	* Actually do the processor shutdown. This is called at splsched,
	456	* running on the processor's shutdown stack.
	457	*/
	458
	459	void
	460	processor_doshutdown(
	461	processor_t processor)
	462	{
de355530	463	register int cpu = processor->slot_num;
1c79356b	464
0b4e3aa0	465	timer_call_cancel(&processor->quantum_timer);
de355530	466	thread_dispatch(current_thread());
1c79356b A	467	timer_switch(&kernel_timer[cpu]);
	468
	469	/*
	470	* OK, now exit this cpu.
	471	*/
	472	PMAP_DEACTIVATE_KERNEL(cpu);
de355530	473	thread_machine_set_current(processor->idle_thread);
1c79356b A	474	cpu_down(cpu);
	475	cpu_sleep();
	476	panic("zombie processor");
	477	/NOTREACHED/
	478	}
	479
	480	kern_return_t
	481	host_get_boot_info(
	482	host_priv_t host_priv,
	483	kernel_boot_info_t boot_info)
	484	{
	485	char *src = "";
	486	extern char *machine_boot_info(
	487	kernel_boot_info_t boot_info,
	488	vm_size_t buf_len);
	489
	490	if (host_priv == HOST_PRIV_NULL)
	491	return (KERN_INVALID_HOST);
	492
	493	assert(host_priv == &realhost);
	494
	495	/*
	496	* Copy first operator string terminated by '\0' followed by
	497	* standardized strings generated from boot string.
	498	*/
	499	src = machine_boot_info(boot_info, KERNEL_BOOT_INFO_MAX);
	500	if (src != boot_info)
	501	(void) strncpy(boot_info, src, KERNEL_BOOT_INFO_MAX);
	502
	503	return (KERN_SUCCESS);
	504	}