[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);
	struct machine_slot		*ms;
	spl_t					s;
	
	/*
	 * Just twiddle our thumbs; we've got nothing better to do
	 * yet, anyway.
	 */
	while (!simple_lock_try(&default_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(&default_pset, processor);
	processor->state = PROCESSOR_RUNNING;
	processor_unlock(processor);
	splx(s);

	simple_unlock(&default_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_next_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->idle_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->idle_lock);
		simple_lock(&pset->idle_lock);
	}

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

	switch (processor->state) {

	case PROCESSOR_IDLE:
		/*
		 * Remove from idle queue.
		 */
		queue_remove(&pset->idle_queue, processor, 
						processor_t, processor_queue);
		pset->idle_count--;

		/* fall through ... */
	case PROCESSOR_RUNNING:
		/*
		 * Put it on the action queue.
		 */
		queue_enter(&processor_action_queue, processor, 
						processor_t,processor_queue);

		/* Fall through ... */
	case PROCESSOR_ASSIGN:
		/*
		 * And ask the action_thread to do the work.
		 */

		if (new_pset == PROCESSOR_SET_NULL) {
			processor->state = PROCESSOR_SHUTDOWN;
			old_next_pset = PROCESSOR_SET_NULL;
		} else {
			processor->state = PROCESSOR_ASSIGN;
			old_next_pset = processor->processor_set_next;
			processor->processor_set_next = new_pset;
		}
		break;

	default:
		printf("state: %d\n", processor->state);
		panic("processor_request_action: bad state");
	}

	if (processor_action_active == FALSE) {
		processor_action_active = TRUE;
		simple_unlock(&processor_action_lock);
		simple_unlock(&pset->idle_lock);
		processor_unlock(processor);
		thread_call_enter(processor_action_call);
		processor_lock(processor);
	} else {
		simple_unlock(&processor_action_lock);
    	simple_unlock(&pset->idle_lock);
	}

	return (old_next_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);
	}

	(void) processor_request_action(processor, PROCESSOR_SET_NULL);

	assert_wait((event_t)processor, THREAD_UNINT);

    processor_unlock(processor);
	splx(s);

	thread_block((void (*)(void)) 0);

	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) queue_first(&processor_action_queue);
		queue_remove(&processor_action_queue, processor, 
						processor_t, processor_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((void (*)(void)) 0);

	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);
		thread->state |= TH_RUN;
		_mk_sp_thread_unblock(thread);
		(void)rem_runq(thread);
		machine_wake_thread = 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);
	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);
	cpu_data[cpu].active_thread = THREAD_NULL;
	active_kloaded[cpu] = THR_ACT_NULL;
	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);
	122	struct machine_slot *ms;
	123	spl_t s;
	124
	125	/*
	126	* Just twiddle our thumbs; we've got nothing better to do
	127	* yet, anyway.
	128	*/
	129	while (!simple_lock_try(&default_pset.processors_lock))
	130	continue;
	131
	132	s = splsched();
	133	processor_lock(processor);
	134	init_ast_check(processor);
	135	ms = &machine_slot[cpu];
	136	ms->running = TRUE;
	137	machine_info.avail_cpus++;
	138	pset_add_processor(&default_pset, processor);
	139	processor->state = PROCESSOR_RUNNING;
	140	processor_unlock(processor);
	141	splx(s);
	142
	143	simple_unlock(&default_pset.processors_lock);
	144	}
	145
	146	/*
	147	* cpu_down:
148	*
149	* Flag specified cpu as down. Called when a processor is about to
150	* go offline.
151	*/
152	void
153	cpu_down(
154	int cpu)
155	{
156	processor_t processor;
157	struct machine_slot *ms;
158	spl_t s;
159
160	processor = cpu_to_processor(cpu);
161
162	s = splsched();
163	processor_lock(processor);
164	ms = &machine_slot[cpu];
165	ms->running = FALSE;
166	machine_info.avail_cpus--;
167	/*
168	* processor has already been removed from pset.
169	*/
170	processor->processor_set_next = PROCESSOR_SET_NULL;
171	processor->state = PROCESSOR_OFF_LINE;
172	processor_unlock(processor);
173	splx(s);
174	}
175
176	kern_return_t
177	host_reboot(
178	host_priv_t host_priv,
179	int options)
180	{
181	if (host_priv == HOST_PRIV_NULL)
182	return (KERN_INVALID_HOST);
183
184	assert(host_priv == &realhost);
185
186	if (options & HOST_REBOOT_DEBUGGER) {
187	Debugger("Debugger");
188	}
189	else
190	halt_all_cpus(!(options & HOST_REBOOT_HALT));
191
192	return (KERN_SUCCESS);
193	}
194
195	/*
196	* processor_request_action:
197	*
198	* Common internals of processor_assign and processor_shutdown.
199	* If new_pset is null, this is a shutdown, else it's an assign
200	* and caller must donate a reference.
201	* For assign operations, it returns an old pset that must be deallocated
202	* if it's not NULL.
203	* For shutdown operations, it always returns PROCESSOR_SET_NULL.
204	*/
205	processor_set_t
206	processor_request_action(
207	processor_t processor,
208	processor_set_t new_pset)
209	{
210	processor_set_t pset, old_next_pset;
211
212	/*
213	* Processor must be in a processor set. Must lock its idle lock to
214	* get at processor state.
215	*/
216	pset = processor->processor_set;
217	simple_lock(&pset->idle_lock);
218
219	/*
220	* If the processor is dispatching, let it finish - it will set its
221	* state to running very soon.
222	*/
223	while ((volatile int )&processor->state == PROCESSOR_DISPATCHING) {
224	simple_unlock(&pset->idle_lock);
225	simple_lock(&pset->idle_lock);
226	}
227
228	/*
229	* Now lock the action queue and do the dirty work.
230	*/
231	simple_lock(&processor_action_lock);
232
233	switch (processor->state) {
234
235	case PROCESSOR_IDLE:
236	/*
237	* Remove from idle queue.
238	*/
239	queue_remove(&pset->idle_queue, processor,
240	processor_t, processor_queue);
241	pset->idle_count--;
242
243	/* fall through ... */
244	case PROCESSOR_RUNNING:
245	/*
246	* Put it on the action queue.
247	*/
248	queue_enter(&processor_action_queue, processor,
249	processor_t,processor_queue);
250
251	/* Fall through ... */
252	case PROCESSOR_ASSIGN:
253	/*
254	* And ask the action_thread to do the work.
255	*/
256
257	if (new_pset == PROCESSOR_SET_NULL) {
258	processor->state = PROCESSOR_SHUTDOWN;
259	old_next_pset = PROCESSOR_SET_NULL;
260	} else {
261	processor->state = PROCESSOR_ASSIGN;
262	old_next_pset = processor->processor_set_next;
263	processor->processor_set_next = new_pset;
264	}
265	break;
266
267	default:
268	printf("state: %d\n", processor->state);
269	panic("processor_request_action: bad state");
270	}
271
272	if (processor_action_active == FALSE) {
273	processor_action_active = TRUE;
274	simple_unlock(&processor_action_lock);
275	simple_unlock(&pset->idle_lock);
276	processor_unlock(processor);
277	thread_call_enter(processor_action_call);
278	processor_lock(processor);
279	} else {
280	simple_unlock(&processor_action_lock);
281	simple_unlock(&pset->idle_lock);
282	}
283
284	return (old_next_pset);
285	}
286
287	kern_return_t
288	processor_assign(
289	processor_t processor,
290	processor_set_t new_pset,
291	boolean_t wait)
292	{
293	#ifdef lint
294	processor++; new_pset++; wait++;
295	#endif /* lint */
296	return (KERN_FAILURE);
297	}
298
299	/*
300	* processor_shutdown() queues a processor up for shutdown.
301	* Any assignment in progress is overriden.
302	*/
303	kern_return_t
304	processor_shutdown(
305	processor_t processor)
306	{
307	spl_t s;
308
309	s = splsched();
310	processor_lock(processor);
311	if ((processor->state == PROCESSOR_OFF_LINE) \|\|
312	(processor->state == PROCESSOR_SHUTDOWN)) {
313	/*
314	* Already shutdown or being shutdown -- nothing to do.
315	*/
316	processor_unlock(processor);
317	splx(s);
318
319	return (KERN_SUCCESS);
320	}
321
322	(void) processor_request_action(processor, PROCESSOR_SET_NULL);
323
324	assert_wait((event_t)processor, THREAD_UNINT);
325
326	processor_unlock(processor);
327	splx(s);
328
329	thread_block((void (*)(void)) 0);
330
331	return (KERN_SUCCESS);
332	}
333
334	/*
335	* processor_action() shuts down processors or changes their assignment.
336	*/
337	static void
338	_processor_action(
339	thread_call_param_t p0,
340	thread_call_param_t p1)
341	{
342	register processor_t processor;
343	spl_t s;
344
345	s = splsched();
346	simple_lock(&processor_action_lock);
347
348	while (!queue_empty(&processor_action_queue)) {
349	processor = (processor_t) queue_first(&processor_action_queue);
350	queue_remove(&processor_action_queue, processor,
351	processor_t, processor_queue);
352	simple_unlock(&processor_action_lock);
353	splx(s);
354
355	processor_doaction(processor);
356
357	s = splsched();
358	simple_lock(&processor_action_lock);
359	}
360
361	processor_action_active = FALSE;
362	simple_unlock(&processor_action_lock);
363	splx(s);
364	}
365
366	void
367	processor_action(void)
368	{
369	queue_init(&processor_action_queue);
370	simple_lock_init(&processor_action_lock, ETAP_THREAD_ACTION);
371	processor_action_active = FALSE;
372
373	thread_call_setup(&processor_action_call_data, _processor_action, NULL);
374	processor_action_call = &processor_action_call_data;
375	}
376
377	/*
378	* processor_doaction actually does the shutdown. The trick here
379	* is to schedule ourselves onto a cpu and then save our
380	* context back into the runqs before taking out the cpu.
381	*/
382	void
383	processor_doaction(
384	processor_t processor)
385	{
386	thread_t self = current_thread();
387	processor_set_t pset;
388	thread_t old_thread;
389	spl_t s;
390
391	/*
392	* Get onto the processor to shutdown
393	*/
394	thread_bind(self, processor);
395	thread_block((void (*)(void)) 0);
396
397	pset = processor->processor_set;
398	simple_lock(&pset->processors_lock);
399
400	if (pset->processor_count == 1) {
401	thread_t thread;
1c79356b A	402	extern void start_cpu_thread(void);
	403
	404	simple_unlock(&pset->processors_lock);
	405
	406	/*
	407	* Create the thread, and point it at the routine.
	408	*/
0b4e3aa0 A	409	thread = kernel_thread_with_priority(
	410	kernel_task, MAXPRI_KERNEL,
	411	start_cpu_thread, TRUE, FALSE);
1c79356b A	412
	413	disable_preemption();
	414
	415	s = splsched();
	416	thread_lock(thread);
	417	thread->state \|= TH_RUN;
0b4e3aa0	418	_mk_sp_thread_unblock(thread);
1c79356b A	419	(void)rem_runq(thread);
	420	machine_wake_thread = thread;
	421	thread_unlock(thread);
	422	splx(s);
	423
	424	simple_lock(&pset->processors_lock);
	425	enable_preemption();
	426	}
	427
	428	s = splsched();
	429	processor_lock(processor);
	430
	431	/*
	432	* Do shutdown, make sure we live when processor dies.
	433	*/
	434	if (processor->state != PROCESSOR_SHUTDOWN) {
	435	panic("action_thread -- bad processor state");
	436	}
	437
	438	pset_remove_processor(pset, processor);
	439	processor_unlock(processor);
	440	simple_unlock(&pset->processors_lock);
	441
	442	/*
	443	* Clean up.
	444	*/
	445	thread_bind(self, PROCESSOR_NULL);
	446	self->continuation = 0;
	447	old_thread = switch_to_shutdown_context(self,
	448	processor_doshutdown, processor);
	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	{
	463	register int cpu = processor->slot_num;
	464
0b4e3aa0	465	timer_call_cancel(&processor->quantum_timer);
1c79356b A	466	thread_dispatch(current_thread());
	467	timer_switch(&kernel_timer[cpu]);
	468
	469	/*
	470	* OK, now exit this cpu.
	471	*/
	472	PMAP_DEACTIVATE_KERNEL(cpu);
	473	cpu_data[cpu].active_thread = THREAD_NULL;
	474	active_kloaded[cpu] = THR_ACT_NULL;
	475	cpu_down(cpu);
	476	cpu_sleep();
	477	panic("zombie processor");
	478	/NOTREACHED/
	479	}
	480
	481	kern_return_t
	482	host_get_boot_info(
	483	host_priv_t host_priv,
	484	kernel_boot_info_t boot_info)
	485	{
	486	char *src = "";
	487	extern char *machine_boot_info(
	488	kernel_boot_info_t boot_info,
	489	vm_size_t buf_len);
	490
	491	if (host_priv == HOST_PRIV_NULL)
	492	return (KERN_INVALID_HOST);
	493
	494	assert(host_priv == &realhost);
	495
	496	/*
	497	* Copy first operator string terminated by '\0' followed by
	498	* standardized strings generated from boot string.
	499	*/
	500	src = machine_boot_info(boot_info, KERNEL_BOOT_INFO_MAX);
	501	if (src != boot_info)
	502	(void) strncpy(boot_info, src, KERNEL_BOOT_INFO_MAX);
	503
	504	return (KERN_SUCCESS);
	505	}