apm.c revision 12959 
1/*
2 * APM (Advanced Power Management) BIOS Device Driver
3 *
4 * Copyright (c) 1994 UKAI, Fumitoshi.
5 * Copyright (c) 1994-1995 by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
6 *
7 * This software may be used, modified, copied, and distributed, in
8 * both source and binary form provided that the above copyright and
9 * these terms are retained. Under no circumstances is the author
10 * responsible for the proper functioning of this software, nor does
11 * the author assume any responsibility for damages incurred with its
12 * use.
13 *
14 * Sep, 1994	Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
15 *
16 *	$Id: apm.c,v 1.20 1995/12/08 11:13:09 julian Exp $
17 */
18
19#include "apm.h"
20
21#include <sys/param.h>
22#include <conf.h>
23#include <sys/conf.h>
24#include <sys/kernel.h>
25#ifdef DEVFS
26#include <sys/devfsext.h>
27#endif /*DEVFS*/
28#include <sys/kernel.h>
29#include <sys/systm.h>
30#include <sys/malloc.h>
31#include <sys/ioctl.h>
32#include <sys/file.h>
33#include <sys/proc.h>
34#include <sys/vnode.h>
35#include "i386/isa/isa.h"
36#include "i386/isa/isa_device.h"
37#include <machine/apm_bios.h>
38#include <machine/segments.h>
39#include <machine/clock.h>
40#include <vm/vm.h>
41#include <vm/vm_param.h>
42#include <vm/pmap.h>
43#include <sys/syslog.h>
44#include "apm_setup.h"
45
46static int apm_display_off __P((void));
47static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx));
48static void apm_resume __P((void));
49
50/* static data */
51struct apm_softc {
52	int	initialized, active, halt_cpu;
53	u_int	minorversion, majorversion;
54	u_int	cs32_base, cs16_base, ds_base;
55	u_int	cs_limit, ds_limit;
56	u_int	cs_entry;
57	u_int	intversion;
58	int	idle_cpu, disabled, disengaged;
59	struct apmhook sc_suspend;
60	struct apmhook sc_resume;
61	void 	*sc_devfs_token;
62};
63
64static struct apm_softc apm_softc[NAPM];
65static struct apm_softc *master_softc = NULL; 	/* XXX */
66static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
67#ifdef APM_SLOWSTART
68int		apm_slowstart = 0;
69int		apm_ss_cnt = 0;
70static int	apm_slowstart_p = 0;
71int		apm_slowstart_stat = 0;
72#endif /* APM_SLOWSTART */
73
74#ifdef MACH_KERNEL
75extern struct fake_descriptor     gdt[GDTSZ];
76extern void fix_desc(struct fake_descriptor *, int);
77#endif /* MACH_KERNEL */
78
79#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
80
81/* Map version number to integer (keeps ordering of version numbers) */
82#define INTVERSION(major, minor)	((major)*100 + (minor))
83
84static timeout_t apm_timeout;
85static d_open_t apmopen;
86static d_close_t apmclose;
87static d_ioctl_t apmioctl;
88
89#define CDEV_MAJOR 39
90static struct cdevsw apm_cdevsw =
91	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
92	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
93	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
94
95/* setup APM GDT discriptors */
96static void
97setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
98{
99	/* setup 32bit code segment */
100	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
101	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
102
103	/* setup 16bit code segment */
104	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
105	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
106
107	/* setup data segment */
108	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
109	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
110
111	/* reflect these changes on physical GDT */
112	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
113	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
114	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
115}
116
117/* 48bit far pointer */
118static struct addr48 {
119	u_long		offset;
120	u_short		segment;
121} apm_addr;
122
123static int apm_errno;
124
125inline
126int
127apm_int(u_long *eax, u_long *ebx, u_long *ecx)
128{
129	u_long cf;
130	__asm ("pushl	%%ebp
131		pushl	%%edx
132		pushl	%%esi
133		xorl	%3,%3
134		movl	%3,%%esi
135		lcall	_apm_addr
136		jnc	1f
137		incl	%3
138	1:
139		popl	%%esi
140		popl	%%edx
141		popl	%%ebp"
142		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
143		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
144		);
145	apm_errno = ((*eax) >> 8) & 0xff;
146	return cf;
147}
148
149
150/* enable/disable power management */
151static int
152apm_enable_disable_pm(struct apm_softc *sc, int enable)
153{
154	u_long eax, ebx, ecx;
155
156	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
157
158	if (sc->intversion >= INTVERSION(1, 1)) {
159		ebx  = PMDV_ALLDEV;
160	} else {
161		ebx  = 0xffff;	/* APM version 1.0 only */
162	}
163	ecx  = enable;
164	return apm_int(&eax, &ebx, &ecx);
165}
166
167/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
168static void
169apm_driver_version(void)
170{
171	u_long eax, ebx, ecx;
172
173#ifdef APM_DEBUG
174	eax = (APM_BIOS<<8) | APM_INSTCHECK;
175	ebx  = 0x0;
176	ecx  = 0x0101;
177	i = apm_int(&eax, &ebx, &ecx);
178	printf("[%04lx %04lx %04lx %ld %02x]\n",
179		eax, ebx, ecx, i, apm_errno);
180#endif
181
182	eax = (APM_BIOS << 8) | APM_DRVVERSION;
183	ebx  = 0x0;
184	ecx  = 0x0101;
185	if(!apm_int(&eax, &ebx, &ecx))
186		apm_version = eax & 0xffff;
187
188#ifdef APM_DEBUG
189	eax = (APM_BIOS << 8) | APM_INSTCHECK;
190	ebx  = 0x0;
191	ecx  = 0x0101;
192	i = apm_int(&eax, &ebx, &ecx);
193	printf("[%04lx %04lx %04lx %ld %02x]\n",
194		eax, ebx, ecx, i, apm_errno);
195#endif
196}
197
198/* engage/disengage power management (APM 1.1 or later) */
199static int
200apm_engage_disengage_pm(struct apm_softc *sc, int engage)
201{
202	u_long eax, ebx, ecx, i;
203
204	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
205	ebx = PMDV_ALLDEV;
206	ecx = engage;
207	i = apm_int(&eax, &ebx, &ecx);
208	return i;
209}
210
211/* get PM event */
212static u_int
213apm_getevent(struct apm_softc *sc)
214{
215	u_long eax, ebx, ecx;
216
217	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
218
219	ebx = 0;
220	ecx = 0;
221	if (apm_int(&eax, &ebx, &ecx))
222		return PMEV_NOEVENT;
223
224	return ebx & 0xffff;
225}
226
227/* suspend entire system */
228static int
229apm_suspend_system(struct apm_softc *sc)
230{
231	u_long eax, ebx, ecx;
232
233	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
234	ebx = PMDV_ALLDEV;
235	ecx = PMST_SUSPEND;
236
237	__asm("cli");
238	if (apm_int(&eax, &ebx, &ecx)) {
239		__asm("sti");
240		printf("Entire system suspend failure: errcode = %ld\n",
241			0xff & (eax >> 8));
242		return 1;
243	}
244	__asm("sti");
245	return 0;
246}
247
248/* Display control */
249/*
250 * Experimental implementation: My laptop machine can't handle this function
251 * If your laptop can control the display via APM, please inform me.
252 *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
253 */
254static int
255apm_display_off(void)
256{
257	u_long eax, ebx, ecx;
258
259	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
260	ebx = PMDV_2NDSTORAGE0;
261	ecx = PMST_STANDBY;
262	if (apm_int(&eax, &ebx, &ecx)) {
263		printf("Display off failure: errcode = %ld\n",
264			0xff & (eax >> 8));
265		return 1;
266	}
267
268	return 0;
269}
270
271/* APM Battery low handler */
272static void
273apm_battery_low(struct apm_softc *sc)
274{
275	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
276}
277
278/* APM hook manager */
279static struct apmhook *
280apm_add_hook(struct apmhook **list, struct apmhook *ah)
281{
282	int s;
283	struct apmhook *p, *prev;
284
285#if 0
286	printf("Add hook \"%s\"\n", ah->ah_name);
287#endif
288
289	s = splhigh();
290	if (ah == NULL) {
291		panic("illegal apm_hook!");
292	}
293	prev = NULL;
294	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
295		if (p->ah_order > ah->ah_order) {
296			break;
297		}
298	}
299
300	if (prev == NULL) {
301		ah->ah_next = *list;
302		*list = ah;
303	} else {
304		ah->ah_next = prev->ah_next;
305		prev->ah_next = ah;
306	}
307	splx(s);
308	return ah;
309}
310
311static void
312apm_del_hook(struct apmhook **list, struct apmhook *ah)
313{
314	int s;
315	struct apmhook *p, *prev;
316
317	s = splhigh();
318	prev = NULL;
319	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
320		if (p == ah) {
321			goto deleteit;
322		}
323	}
324	panic("Tried to delete unregistered apm_hook.");
325	goto nosuchnode;
326deleteit:
327	if (prev != NULL) {
328		prev->ah_next = p->ah_next;
329	} else {
330		*list = p->ah_next;
331	}
332nosuchnode:
333	splx(s);
334}
335
336
337/* APM driver calls some functions automatically */
338static void
339apm_execute_hook(struct apmhook *list)
340{
341	struct apmhook *p;
342
343	for (p = list; p != NULL; p = p->ah_next) {
344#if 0
345		printf("Execute APM hook \"%s.\"\n", p->ah_name);
346#endif
347		if ((*(p->ah_fun))(p->ah_arg)) {
348			printf("Warning: APM hook \"%s\" failed", p->ah_name);
349		}
350	}
351}
352
353
354/* establish an apm hook */
355struct apmhook *
356apm_hook_establish(int apmh, struct apmhook *ah)
357{
358	if (apmh < 0 || apmh >= NAPM_HOOK)
359		return NULL;
360
361	return apm_add_hook(&hook[apmh], ah);
362}
363
364/* disestablish an apm hook */
365static void
366apm_hook_disestablish(int apmh, struct apmhook *ah)
367{
368	if (apmh < 0 || apmh >= NAPM_HOOK)
369		return;
370
371	apm_del_hook(&hook[apmh], ah);
372}
373
374
375static struct timeval suspend_time;
376static struct timeval diff_time;
377
378static int
379apm_default_resume(void *arg)
380{
381	int pl;
382	u_int second, minute, hour;
383	struct timeval resume_time, tmp_time;
384
385	/* modified for adjkerntz */
386	pl = splsoftclock();
387	inittodr(0);			/* adjust time to RTC */
388	microtime(&resume_time);
389	tmp_time = time;		/* because 'time' is volatile */
390	timevaladd(&tmp_time, &diff_time);
391	time = tmp_time;
392	splx(pl);
393	second = resume_time.tv_sec - suspend_time.tv_sec;
394	hour = second / 3600;
395	second %= 3600;
396	minute = second / 60;
397	second %= 60;
398	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
399		hour, minute, second);
400	return 0;
401}
402
403static int
404apm_default_suspend(void *arg)
405{
406	int	pl;
407
408	pl = splsoftclock();
409	microtime(&diff_time);
410	inittodr(0);
411	microtime(&suspend_time);
412	timevalsub(&diff_time, &suspend_time);
413	splx(pl);
414	return 0;
415}
416
417static void apm_processevent(struct apm_softc *);
418
419/*
420 * Public interface to the suspend/resume:
421 *
422 * Execute suspend and resume hook before and after sleep, respectively.
423 *
424 */
425
426void
427apm_suspend(void)
428{
429	struct apm_softc *sc;
430
431	sc = master_softc;      /* XXX */
432	if (!sc)
433		return;
434
435	if (sc->initialized) {
436		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
437		apm_suspend_system(sc);
438		apm_processevent(sc);
439	}
440}
441
442void
443apm_resume(void)
444{
445	struct apm_softc *sc;
446
447	sc = master_softc;      /* XXX */
448	if (!sc)
449		return;
450
451	if (sc->initialized) {
452		apm_execute_hook(hook[APM_HOOK_RESUME]);
453	}
454}
455
456
457/* get APM information */
458static int
459apm_get_info(struct apm_softc *sc, apm_info_t aip)
460{
461	u_long eax, ebx, ecx;
462
463	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
464	ebx = PMDV_ALLDEV;
465	ecx = 0;
466
467	if (apm_int(&eax, &ebx, &ecx))
468		return 1;
469
470	aip->ai_acline    = (ebx >> 8) & 0xff;
471	aip->ai_batt_stat = ebx & 0xff;
472	aip->ai_batt_life = ecx & 0xff;
473	aip->ai_major     = (u_int)sc->majorversion;
474	aip->ai_minor     = (u_int)sc->minorversion;
475	return 0;
476}
477
478
479/* inform APM BIOS that CPU is idle */
480static void
481apm_cpu_idle(void)
482{
483	struct apm_softc *sc = master_softc;    /* XXX */
484
485	if (sc->idle_cpu) {
486		if (sc->active) {
487			__asm ("movw $0x5305, %ax; lcall _apm_addr");
488		}
489	}
490	/*
491	 * Some APM implementation halts CPU in BIOS, whenever
492	 * "CPU-idle" function are invoked, but swtch() of
493	 * FreeBSD halts CPU, therefore, CPU is halted twice
494	 * in the sched loop. It makes the interrupt latency
495	 * terribly long and be able to cause a serious problem
496	 * in interrupt processing. We prevent it by removing
497	 * "hlt" operation from swtch() and managed it under
498	 * APM driver.
499	 */
500	/*
501	 * UKAI Note: on NetBSD, idle() called from cpu_switch()
502	 * doesn't halt CPU, so halt_cpu may not need on NetBSD/i386
503	 * or only "sti" operation would be needed.
504	 */
505
506	if (!sc->active || sc->halt_cpu) {
507		__asm("sti ; hlt");	/* wait for interrupt */
508	}
509}
510
511/* inform APM BIOS that CPU is busy */
512static void
513apm_cpu_busy(void)
514{
515	struct apm_softc *sc = master_softc;	/* XXX */
516
517	if (sc->idle_cpu && sc->active) {
518		__asm("movw $0x5306, %ax; lcall _apm_addr");
519	}
520}
521
522
523/*
524 * APM timeout routine:
525 *
526 * This routine is automatically called by timer once per second.
527 */
528
529static void
530apm_timeout(void *arg)
531{
532	struct apm_softc *sc = arg;
533
534	apm_processevent(sc);
535	timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
536}
537
538/* enable APM BIOS */
539static void
540apm_event_enable(struct apm_softc *sc)
541{
542#ifdef APM_DEBUG
543	printf("called apm_event_enable()\n");
544#endif
545	if (sc->initialized) {
546		sc->active = 1;
547		apm_timeout(sc);
548	}
549}
550
551/* disable APM BIOS */
552static void
553apm_event_disable(struct apm_softc *sc)
554{
555#ifdef APM_DEBUG
556	printf("called apm_event_disable()\n");
557#endif
558	if (sc->initialized) {
559		untimeout(apm_timeout, NULL);
560		sc->active = 0;
561	}
562}
563
564/* halt CPU in scheduling loop */
565static void
566apm_halt_cpu(struct apm_softc *sc)
567{
568	if (sc->initialized) {
569		sc->halt_cpu = 1;
570	}
571#ifdef APM_SLOWSTART
572	apm_slowstart = 0;
573#endif /* APM_SLOWSTART */
574}
575
576/* don't halt CPU in scheduling loop */
577static void
578apm_not_halt_cpu(struct apm_softc *sc)
579{
580	if (sc->initialized) {
581		sc->halt_cpu = 0;
582	}
583#ifdef APM_SLOWSTART
584	apm_slowstart = apm_slowstart_p;
585#endif /* APM_SLOWSTART */
586}
587
588/* device driver definitions */
589static int apmprobe (struct isa_device *);
590static int apmattach(struct isa_device *);
591struct isa_driver apmdriver = {
592	apmprobe, apmattach, "apm" };
593
594/*
595 * probe APM (dummy):
596 *
597 * APM probing routine is placed on locore.s and apm_init.S because
598 * this process forces the CPU to turn to real mode or V86 mode.
599 * Current version uses real mode, but on future version, we want
600 * to use V86 mode in APM initialization.
601 */
602
603static int
604apmprobe(struct isa_device *dvp)
605{
606	int     unit = dvp->id_unit;
607
608	switch (apm_version) {
609	case APMINI_CANTFIND:
610		/* silent */
611		return 0;
612	case APMINI_NOT32BIT:
613		printf("apm%d: 32bit connection is not supported.\n", unit);
614		return 0;
615	case APMINI_CONNECTERR:
616		printf("apm%d: 32-bit connection error.\n", unit);
617		return 0;
618	}
619
620	return -1;
621}
622
623
624/* Process APM event */
625static void
626apm_processevent(struct apm_softc *sc)
627{
628	int apm_event;
629
630#ifdef APM_DEBUG
631#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
632	printf("Original APM Event: " #symbol "\n");
633#else
634#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
635#endif
636	while (1) {
637		apm_event = apm_getevent(sc);
638		if (apm_event == PMEV_NOEVENT)
639			break;
640		switch (apm_event) {
641		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
642			apm_suspend();
643			break;
644		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
645			apm_suspend();
646			break;
647		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
648			apm_suspend();
649			break;
650		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
651			apm_suspend();
652			break;
653		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
654			apm_resume();
655			break;
656		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
657			apm_resume();
658			break;
659		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
660			apm_resume();
661			break;
662		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
663			apm_battery_low(sc);
664			apm_suspend();
665			break;
666
667		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
668			break;
669
670		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
671			inittodr(0);	/* adjust time to RTC */
672			break;
673
674		    default:
675			printf("Unknown Original APM Event 0x%x\n", apm_event);
676			    break;
677		}
678	}
679}
680
681/*
682 * Attach APM:
683 *
684 * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
685 *
686 * Now, unless I'm mad, (not quite ruled out yet), the APM-1.1 spec is bogus:
687 *
688 * Appendix C says under the header "APM 1.0/APM 1.1 Modal BIOS Behavior"
689 * that "When an APM Driver connects with an APM 1.1 BIOS, the APM 1.1 BIOS
690 * will default to an APM 1.0 connection.  After an APM Driver calls the APM
691 * Driver Version function, specifying that it supports APM 1.1, and [sic!]
692 * APM BIOS will change its behavior to an APM 1.1 connection.  If the APM
693 * BIOS is an APM 1.0 BIOS, the APM Driver Version function call will fail,
694 * and the connection will remain an APM 1.0 connection."
695 *
696 * OK so I can establish a 1.0 connection, and then tell that I'm a 1.1
697 * and maybe then the BIOS will tell that it too is a 1.1.
698 * Fine.
699 * Now how will I ever get the segment-limits for instance ?  There is no
700 * way I can see that I can get a 1.1 response back from an "APM Protected
701 * Mode 32-bit Interface Connect" function ???
702 *
703 * Who made this,  Intel and Microsoft ?  -- How did you guess !
704 *
705 * /phk
706 */
707
708static int
709apmattach(struct isa_device *dvp)
710{
711	int	unit = dvp->id_unit;
712	char	name[32];
713#define APM_KERNBASE	KERNBASE
714	struct apm_softc	*sc = &apm_softc[unit];
715
716	master_softc = sc;	/* XXX */
717	sc->initialized = 0;
718	sc->active = 0;
719	sc->halt_cpu = 1;
720
721	/* setup APM parameters */
722	sc->cs16_base = (apm_cs32_base << 4) + APM_KERNBASE;
723	sc->cs32_base = (apm_cs16_base << 4) + APM_KERNBASE;
724	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
725	sc->cs_limit = apm_cs_limit;
726	sc->ds_limit = apm_ds_limit;
727	sc->cs_entry = apm_cs_entry;
728
729	sc->idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
730	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
731	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
732
733#ifdef APM_SLOWSTART
734	if (sc->idle_cpu) {
735		apm_slowstart = apm_slowstart_p = 1;
736	}
737#endif
738
739	/* print bootstrap messages */
740#ifdef APM_DEBUG
741	printf(" found APM BIOS version %04x\n",  apm_version);
742	printf("apm%d: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
743		unit, sc->cs32_base, sc->cs16_base, sc->ds_base);
744	printf("apm%d: Code entry 0x%08x, Idling CPU %s, Management %s\n",
745		unit, sc->cs_entry, is_enabled(sc->idle_cpu),
746		is_enabled(!sc->disabled));
747	printf("apm%d: CS_limit=%x, DS_limit=%x\n",
748		unit, sc->cs_limit, sc->ds_limit);
749#endif /* APM_DEBUG */
750
751	sc->cs_limit = 0xffff;
752	sc->ds_limit = 0xffff;
753
754	/* setup GDT */
755	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
756			sc->cs_limit, sc->ds_limit);
757
758	/* setup entry point 48bit pointer */
759	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
760	apm_addr.offset  = sc->cs_entry;
761
762	/* Try to kick bios into 1.1 mode */
763	apm_driver_version();
764	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
765			((apm_version & 0x000f) >> 0);
766	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
767			((apm_version & 0x0f00) >> 8);
768
769	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
770
771	if (sc->intversion >= INTVERSION(1, 1)) {
772		printf("apm%d: Engaged control %s\n",
773			unit, is_enabled(!sc->disengaged));
774	}
775
776	printf(" found APM BIOS version %d.%d\n",
777		sc->majorversion, sc->minorversion);
778	printf("apm%d: Idling CPU %s\n", unit, is_enabled(sc->idle_cpu));
779
780	/* enable power management */
781	if (sc->disabled) {
782		if (apm_enable_disable_pm(sc, 1)) {
783			printf("Warning: APM enable function failed! [%x]\n",
784				apm_errno);
785		}
786	}
787
788	/* engage power managment (APM 1.1 or later) */
789	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
790		if (apm_engage_disengage_pm(sc, 1)) {
791			printf("Warning: APM engage function failed [%x]\n",
792				apm_errno);
793		}
794	}
795
796        /* default suspend hook */
797        sc->sc_suspend.ah_fun = apm_default_suspend;
798        sc->sc_suspend.ah_arg = sc;
799        sc->sc_suspend.ah_name = "default suspend";
800        sc->sc_suspend.ah_order = APM_MAX_ORDER;
801
802        /* default resume hook */
803        sc->sc_resume.ah_fun = apm_default_resume;
804        sc->sc_resume.ah_arg = sc;
805        sc->sc_resume.ah_name = "default resume";
806        sc->sc_resume.ah_order = APM_MIN_ORDER;
807
808        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
809        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
810
811	apm_event_enable(sc);
812
813	sc->initialized = 1;
814
815#ifdef DEVFS
816	sprintf(name,"apm%d",unit);
817	sc->sc_devfs_token = devfs_add_devsw(
818		"/",	name,	&apm_cdevsw,	unit,	DV_CHR,	0,  0, 0600);
819#endif
820	return 0;
821}
822
823static int
824apmopen(dev_t dev, int flag, int fmt, struct proc *p)
825{
826	struct apm_softc *sc = &apm_softc[minor(dev)];
827
828	if (minor(dev) >= NAPM) {
829		return (ENXIO);
830	}
831	if (!sc->initialized) {
832		return ENXIO;
833	}
834	return 0;
835}
836
837static int
838apmclose(dev_t dev, int flag, int fmt, struct proc *p)
839{
840	return 0;
841}
842
843static int
844apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
845{
846	struct apm_softc *sc = &apm_softc[minor(dev)];
847	int error = 0;
848
849#ifdef APM_DEBUG
850	printf("APM ioctl: minor = %d, cmd = 0x%x\n", minor(dev), cmd);
851#endif
852
853	if (minor(dev) >= NAPM) {
854		return ENXIO;
855	}
856	if (!sc->initialized) {
857		return ENXIO;
858	}
859	switch (cmd) {
860	case APMIO_SUSPEND:
861		apm_suspend();
862		break;
863	case APMIO_GETINFO:
864		if (apm_get_info(sc, (apm_info_t)addr)) {
865			error = ENXIO;
866		}
867		break;
868	case APMIO_ENABLE:
869		apm_event_enable(sc);
870		break;
871	case APMIO_DISABLE:
872		apm_event_disable(sc);
873		break;
874	case APMIO_HALTCPU:
875		apm_halt_cpu(sc);
876		break;
877	case APMIO_NOTHALTCPU:
878		apm_not_halt_cpu(sc);
879		break;
880	case APMIO_DISPLAYOFF:
881		if (apm_display_off()) {
882			error = ENXIO;
883		}
884		break;
885	default:
886		error = EINVAL;
887		break;
888	}
889	return error;
890}
891
892
893static apm_devsw_installed = 0;
894
895static void
896apm_drvinit(void *unused)
897{
898	dev_t dev;
899
900	if( ! apm_devsw_installed ) {
901		dev = makedev(CDEV_MAJOR,0);
902		cdevsw_add(&dev,&apm_cdevsw,NULL);
903		apm_devsw_installed = 1;
904    	}
905}
906
907SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)
908