[apple/xnu.git] / osfmk / kern / machine.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) 1991,1990,1989,1988,1987 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	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* @OSF_COPYRIGHT@
	24	*/
	25	/*
	26	* Mach Operating System
	27	* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
	28	* All Rights Reserved.
	29	*
	30	* Permission to use, copy, modify and distribute this software and its
	31	* documentation is hereby granted, provided that both the copyright
	32	* notice and this permission notice appear in all copies of the
	33	* software, derivative works or modified versions, and any portions
	34	* thereof, and that both notices appear in supporting documentation.
	35	*
	36	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	37	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	38	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	39	*
	40	* Carnegie Mellon requests users of this software to return to
	41	*
	42	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	43	* School of Computer Science
	44	* Carnegie Mellon University
	45	* Pittsburgh PA 15213-3890
	46	*
	47	* any improvements or extensions that they make and grant Carnegie Mellon
	48	* the rights to redistribute these changes.
	49	*/
	50	/*
	51	*/
	52	/*
	53	* File: kern/machine.c
	54	* Author: Avadis Tevanian, Jr.
	55	* Date: 1987
	56	*
	57	* Support for machine independent machine abstraction.
	58	*/
	59
	60	#include <cpus.h>
	61
	62	#include <string.h>
	63	#include <mach/boolean.h>
	64	#include <mach/kern_return.h>
65	#include <mach/mach_types.h>
66	#include <mach/machine.h>
67	#include <mach/host_info.h>
68	#include <mach/host_reboot.h>
69	#include <kern/counters.h>
70	#include <kern/cpu_data.h>
71	#include <kern/ipc_host.h>
72	#include <kern/host.h>
73	#include <kern/lock.h>
74	#include <kern/machine.h>
75	#include <kern/processor.h>
76	#include <kern/queue.h>
77	#include <kern/sched.h>
78	#include <kern/task.h>
79	#include <kern/thread.h>
80	#include <kern/thread_swap.h>
81	#include <kern/misc_protos.h>
82
0b4e3aa0	83	#include <kern/mk_sp.h>
1c79356b A	84
	85	/*
	86	* Exported variables:
	87	*/
	88
	89	struct machine_info machine_info;
	90	struct machine_slot machine_slot[NCPUS];
	91
	92	static queue_head_t processor_action_queue;
	93	static boolean_t processor_action_active;
	94	static thread_call_t processor_action_call;
	95	static thread_call_data_t processor_action_call_data;
	96	decl_simple_lock_data(static,processor_action_lock)
	97
	98	thread_t machine_wake_thread;
	99
	100	/* Forwards */
	101	processor_set_t processor_request_action(
	102	processor_t processor,
	103	processor_set_t new_pset);
	104
	105	void processor_doaction(
	106	processor_t processor);
	107
	108	void processor_doshutdown(
	109	processor_t processor);
	110
	111	/*
	112	* cpu_up:
	113	*
	114	* Flag specified cpu as up and running. Called when a processor comes
	115	* online.
	116	*/
	117	void
	118	cpu_up(
	119	int cpu)
	120	{
	121	processor_t processor = cpu_to_processor(cpu);
9bccf70c	122	processor_set_t pset = &default_pset;
1c79356b A	123	struct machine_slot *ms;
	124	spl_t s;
	125
	126	/*
	127	* Just twiddle our thumbs; we've got nothing better to do
	128	* yet, anyway.
	129	*/
9bccf70c	130	while (!simple_lock_try(&pset->processors_lock))
1c79356b A	131	continue;
	132
	133	s = splsched();
	134	processor_lock(processor);
	135	init_ast_check(processor);
	136	ms = &machine_slot[cpu];
	137	ms->running = TRUE;
	138	machine_info.avail_cpus++;
9bccf70c A	139	pset_add_processor(pset, processor);
	140	simple_lock(&pset->sched_lock);
	141	enqueue_tail(&pset->active_queue, (queue_entry_t)processor);
1c79356b	142	processor->state = PROCESSOR_RUNNING;
9bccf70c	143	simple_unlock(&pset->sched_lock);
1c79356b A	144	processor_unlock(processor);
	145	splx(s);
	146
9bccf70c	147	simple_unlock(&pset->processors_lock);
1c79356b A	148	}
	149
	150	/*
	151	* cpu_down:
	152	*
	153	* Flag specified cpu as down. Called when a processor is about to
	154	* go offline.
	155	*/
	156	void
	157	cpu_down(
	158	int cpu)
	159	{
	160	processor_t processor;
	161	struct machine_slot *ms;
	162	spl_t s;
	163
	164	processor = cpu_to_processor(cpu);
	165
	166	s = splsched();
	167	processor_lock(processor);
	168	ms = &machine_slot[cpu];
	169	ms->running = FALSE;
	170	machine_info.avail_cpus--;
	171	/*
	172	* processor has already been removed from pset.
	173	*/
	174	processor->processor_set_next = PROCESSOR_SET_NULL;
	175	processor->state = PROCESSOR_OFF_LINE;
	176	processor_unlock(processor);
	177	splx(s);
	178	}
	179
	180	kern_return_t
	181	host_reboot(
	182	host_priv_t host_priv,
	183	int options)
	184	{
	185	if (host_priv == HOST_PRIV_NULL)
	186	return (KERN_INVALID_HOST);
	187
	188	assert(host_priv == &realhost);
	189
	190	if (options & HOST_REBOOT_DEBUGGER) {
	191	Debugger("Debugger");
	192	}
	193	else
	194	halt_all_cpus(!(options & HOST_REBOOT_HALT));
	195
	196	return (KERN_SUCCESS);
	197	}
	198
	199	/*
	200	* processor_request_action:
	201	*
	202	* Common internals of processor_assign and processor_shutdown.
	203	* If new_pset is null, this is a shutdown, else it's an assign
	204	* and caller must donate a reference.
	205	* For assign operations, it returns an old pset that must be deallocated
	206	* if it's not NULL.
	207	* For shutdown operations, it always returns PROCESSOR_SET_NULL.
	208	*/
	209	processor_set_t
	210	processor_request_action(
	211	processor_t processor,
212	processor_set_t new_pset)
213	{
9bccf70c	214	processor_set_t pset, old_pset;
1c79356b A	215
	216	/*
	217	* Processor must be in a processor set. Must lock its idle lock to
	218	* get at processor state.
	219	*/
	220	pset = processor->processor_set;
9bccf70c	221	simple_lock(&pset->sched_lock);
1c79356b A	222
	223	/*
	224	* If the processor is dispatching, let it finish - it will set its
	225	* state to running very soon.
	226	*/
	227	while ((volatile int )&processor->state == PROCESSOR_DISPATCHING) {
9bccf70c A	228	simple_unlock(&pset->sched_lock);
	229
	230	simple_lock(&pset->sched_lock);
1c79356b A	231	}
1c79356b A	232
9bccf70c A	233	assert( processor->state == PROCESSOR_IDLE \|\|
	234	processor->state == PROCESSOR_RUNNING \|\|
	235	processor->state == PROCESSOR_ASSIGN );
	236
1c79356b A	237	/*
	238	* Now lock the action queue and do the dirty work.
	239	*/
	240	simple_lock(&processor_action_lock);
	241
9bccf70c A	242	if (processor->state == PROCESSOR_IDLE) {
9bccf70c A	243	remqueue(&pset->idle_queue, (queue_entry_t)processor);
1c79356b	244	pset->idle_count--;
9bccf70c A	245	}
	246	else
	247	if (processor->state == PROCESSOR_RUNNING)
	248	remqueue(&pset->active_queue, (queue_entry_t)processor);
1c79356b	249
9bccf70c A	250	if (processor->state != PROCESSOR_ASSIGN)
9bccf70c A	251	enqueue_tail(&processor_action_queue, (queue_entry_t)processor);
1c79356b	252
9bccf70c A	253	/*
	254	* And ask the action_thread to do the work.
	255	*/
	256	if (new_pset != PROCESSOR_SET_NULL) {
	257	processor->state = PROCESSOR_ASSIGN;
	258	old_pset = processor->processor_set_next;
	259	processor->processor_set_next = new_pset;
	260	}
	261	else {
	262	processor->state = PROCESSOR_SHUTDOWN;
	263	old_pset = PROCESSOR_SET_NULL;
1c79356b A	264	}
1c79356b A	265
9bccf70c A	266	simple_unlock(&pset->sched_lock);
	267
	268	if (processor_action_active) {
1c79356b	269	simple_unlock(&processor_action_lock);
9bccf70c A	270
9bccf70c A	271	return (old_pset);
1c79356b A	272	}
1c79356b A	273
9bccf70c A	274	processor_action_active = TRUE;
	275	simple_unlock(&processor_action_lock);
	276
	277	processor_unlock(processor);
	278
	279	thread_call_enter(processor_action_call);
	280	processor_lock(processor);
	281
	282	return (old_pset);
1c79356b A	283	}
	284
	285	kern_return_t
	286	processor_assign(
	287	processor_t processor,
	288	processor_set_t new_pset,
	289	boolean_t wait)
	290	{
	291	#ifdef lint
	292	processor++; new_pset++; wait++;
	293	#endif /* lint */
	294	return (KERN_FAILURE);
	295	}
	296
	297	/*
	298	* processor_shutdown() queues a processor up for shutdown.
	299	* Any assignment in progress is overriden.
	300	*/
	301	kern_return_t
	302	processor_shutdown(
	303	processor_t processor)
	304	{
	305	spl_t s;
	306
	307	s = splsched();
	308	processor_lock(processor);
9bccf70c A	309	if ( processor->state == PROCESSOR_OFF_LINE \|\|
9bccf70c A	310	processor->state == PROCESSOR_SHUTDOWN ) {
1c79356b A	311	/*
	312	* Already shutdown or being shutdown -- nothing to do.
	313	*/
	314	processor_unlock(processor);
	315	splx(s);
	316
	317	return (KERN_SUCCESS);
	318	}
	319
9bccf70c	320	processor_request_action(processor, PROCESSOR_SET_NULL);
1c79356b A	321
	322	assert_wait((event_t)processor, THREAD_UNINT);
	323
	324	processor_unlock(processor);
	325	splx(s);
	326
9bccf70c	327	thread_block(THREAD_CONTINUE_NULL);
1c79356b A	328
	329	return (KERN_SUCCESS);
	330	}
	331
	332	/*
	333	* processor_action() shuts down processors or changes their assignment.
	334	*/
	335	static void
	336	_processor_action(
	337	thread_call_param_t p0,
	338	thread_call_param_t p1)
	339	{
	340	register processor_t processor;
	341	spl_t s;
	342
	343	s = splsched();
	344	simple_lock(&processor_action_lock);
	345
	346	while (!queue_empty(&processor_action_queue)) {
9bccf70c	347	processor = (processor_t)dequeue_head(&processor_action_queue);
1c79356b A	348	simple_unlock(&processor_action_lock);
	349	splx(s);
	350
	351	processor_doaction(processor);
	352
	353	s = splsched();
	354	simple_lock(&processor_action_lock);
	355	}
	356
	357	processor_action_active = FALSE;
	358	simple_unlock(&processor_action_lock);
	359	splx(s);
	360	}
	361
	362	void
	363	processor_action(void)
	364	{
	365	queue_init(&processor_action_queue);
	366	simple_lock_init(&processor_action_lock, ETAP_THREAD_ACTION);
	367	processor_action_active = FALSE;
	368
	369	thread_call_setup(&processor_action_call_data, _processor_action, NULL);
	370	processor_action_call = &processor_action_call_data;
	371	}
	372
	373	/*
	374	* processor_doaction actually does the shutdown. The trick here
	375	* is to schedule ourselves onto a cpu and then save our
	376	* context back into the runqs before taking out the cpu.
	377	*/
	378	void
	379	processor_doaction(
	380	processor_t processor)
	381	{
	382	thread_t self = current_thread();
	383	processor_set_t pset;
	384	thread_t old_thread;
	385	spl_t s;
	386
	387	/*
	388	* Get onto the processor to shutdown
	389	*/
	390	thread_bind(self, processor);
9bccf70c	391	thread_block(THREAD_CONTINUE_NULL);
1c79356b A	392
	393	pset = processor->processor_set;
	394	simple_lock(&pset->processors_lock);
	395
	396	if (pset->processor_count == 1) {
	397	thread_t thread;
1c79356b A	398	extern void start_cpu_thread(void);
	399
	400	simple_unlock(&pset->processors_lock);
	401
	402	/*
	403	* Create the thread, and point it at the routine.
	404	*/
0b4e3aa0 A	405	thread = kernel_thread_with_priority(
	406	kernel_task, MAXPRI_KERNEL,
	407	start_cpu_thread, TRUE, FALSE);
1c79356b A	408
	409	disable_preemption();
	410
	411	s = splsched();
	412	thread_lock(thread);
1c79356b	413	machine_wake_thread = thread;
9bccf70c A	414	thread_go_locked(thread, THREAD_AWAKENED);
9bccf70c A	415	(void)rem_runq(thread);
1c79356b A	416	thread_unlock(thread);
	417	splx(s);
	418
	419	simple_lock(&pset->processors_lock);
	420	enable_preemption();
	421	}
	422
	423	s = splsched();
	424	processor_lock(processor);
	425
	426	/*
	427	* Do shutdown, make sure we live when processor dies.
	428	*/
	429	if (processor->state != PROCESSOR_SHUTDOWN) {
	430	panic("action_thread -- bad processor state");
	431	}
	432
	433	pset_remove_processor(pset, processor);
	434	processor_unlock(processor);
	435	simple_unlock(&pset->processors_lock);
	436
	437	/*
	438	* Clean up.
	439	*/
	440	thread_bind(self, PROCESSOR_NULL);
	441	self->continuation = 0;
	442	old_thread = switch_to_shutdown_context(self,
	443	processor_doshutdown, processor);
9bccf70c A	444	if (processor != current_processor())
9bccf70c A	445	timer_call_shutdown(processor);
1c79356b A	446	thread_dispatch(old_thread);
	447	thread_wakeup((event_t)processor);
	448	splx(s);
	449	}
	450
	451	/*
	452	* Actually do the processor shutdown. This is called at splsched,
	453	* running on the processor's shutdown stack.
	454	*/
	455
	456	void
	457	processor_doshutdown(
	458	processor_t processor)
	459	{
	460	register int cpu = processor->slot_num;
	461
0b4e3aa0	462	timer_call_cancel(&processor->quantum_timer);
1c79356b A	463	thread_dispatch(current_thread());
	464	timer_switch(&kernel_timer[cpu]);
	465
	466	/*
	467	* OK, now exit this cpu.
	468	*/
	469	PMAP_DEACTIVATE_KERNEL(cpu);
9bccf70c	470	thread_machine_set_current(processor->idle_thread);
1c79356b A	471	cpu_down(cpu);
	472	cpu_sleep();
	473	panic("zombie processor");
	474	/NOTREACHED/
	475	}
	476
	477	kern_return_t
	478	host_get_boot_info(
	479	host_priv_t host_priv,
	480	kernel_boot_info_t boot_info)
	481	{
	482	char *src = "";
	483	extern char *machine_boot_info(
	484	kernel_boot_info_t boot_info,
	485	vm_size_t buf_len);
	486
	487	if (host_priv == HOST_PRIV_NULL)
	488	return (KERN_INVALID_HOST);
	489
	490	assert(host_priv == &realhost);
	491
	492	/*
	493	* Copy first operator string terminated by '\0' followed by
	494	* standardized strings generated from boot string.
	495	*/
	496	src = machine_boot_info(boot_info, KERNEL_BOOT_INFO_MAX);
	497	if (src != boot_info)
	498	(void) strncpy(boot_info, src, KERNEL_BOOT_INFO_MAX);
	499
	500	return (KERN_SUCCESS);
	501	}