The PC98-specific files.

Ok'd by:	core
Submitted by:	FreeBSD(98) development team

1 files changed, 929 insertions, 0 deletions

diff --git a/sys/pc98/apm/apm.c b/sys/pc98/apm/apm.c
new file mode 100644
index 0000000..d140eb0
--- /dev/null
+++ b/sys/pc98/apm/apm.c
@@ -0,0 +1,929 @@
+/*
+ * APM (Advanced Power Management) BIOS Device Driver
+ *
+ * Copyright (c) 1994 UKAI, Fumitoshi.
+ * Copyright (c) 1994-1995 by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
+ * Copyright (c) 1996 Nate Williams <nate@FreeBSD.org>
+ *
+ * This software may be used, modified, copied, and distributed, in
+ * both source and binary form provided that the above copyright and
+ * these terms are retained. Under no circumstances is the author
+ * responsible for the proper functioning of this software, nor does
+ * the author assume any responsibility for damages incurred with its
+ * use.
+ *
+ * Sep, 1994	Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
+ *
+ *	$Id: apm.c,v 1.43 1996/06/04 17:50:28 nate Exp $
+ */
+
+#include "apm.h"
+
+#if NAPM > 1
+#error only one APM device may be configured
+#endif
+ 
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#ifdef DEVFS
+#include <sys/devfsext.h>
+#endif /*DEVFS*/
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/ioctl.h>
+#include <sys/file.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#ifdef PC98
+#include "pc98/pc98/pc98.h"
+#include "pc98/pc98/pc98_device.h"
+#else
+#include "i386/isa/isa.h"
+#include "i386/isa/isa_device.h"
+#endif
+#include <machine/apm_bios.h>
+#include <machine/segments.h>
+#include <machine/clock.h>
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+#include <sys/syslog.h>
+#include <sys/devconf.h>
+#include "apm_setup.h"
+
+static int apm_display_off __P((void));
+static int apm_int __P((u_long *eax, u_long *ebx, u_long *ecx));
+static void apm_resume __P((void));
+
+/* static data */
+struct apm_softc {
+	int	initialized, active;
+	int	always_halt_cpu, slow_idle_cpu;
+	int	disabled, disengaged;
+	u_int	minorversion, majorversion;
+	u_int	cs32_base, cs16_base, ds_base;
+	u_int	cs_limit, ds_limit;
+	u_int	cs_entry;
+	u_int	intversion;
+	struct apmhook sc_suspend;
+	struct apmhook sc_resume;
+#ifdef DEVFS
+	void 	*sc_devfs_token;
+#endif
+};
+
+static struct kern_devconf kdc_apm = {
+	0, 0, 0,		/* filled in by dev_attach */
+	"apm", 0, { MDDT_ISA, 0 },
+	isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
+	&kdc_isa0,		/* parent */
+	0,			/* parentdata */
+	DC_UNCONFIGURED,	/* state */
+	"Advanced Power Management BIOS",
+	DC_CLS_MISC		/* class */
+};
+
+
+static struct apm_softc apm_softc;
+static struct apmhook	*hook[NAPM_HOOK];		/* XXX */
+
+#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
+
+/* Map version number to integer (keeps ordering of version numbers) */
+#define INTVERSION(major, minor)	((major)*100 + (minor))
+
+static timeout_t apm_timeout;
+static d_open_t apmopen;
+static d_close_t apmclose;
+static d_ioctl_t apmioctl;
+
+#define CDEV_MAJOR 39
+static struct cdevsw apm_cdevsw = 
+	{ apmopen,	apmclose,	noread,		nowrite,	/*39*/
+	  apmioctl,	nostop,		nullreset,	nodevtotty,/* APM */
+	  seltrue,	nommap,		NULL ,	"apm"	,NULL,	-1};
+
+static void
+apm_registerdev(struct isa_device *id)
+{
+	if (kdc_apm.kdc_isa)
+		return;
+	kdc_apm.kdc_state = DC_UNCONFIGURED;
+	kdc_apm.kdc_unit = 0;
+	kdc_apm.kdc_isa = id;
+	dev_attach(&kdc_apm);
+}
+
+/* setup APM GDT discriptors */
+static void
+setup_apm_gdt(u_int code32_base, u_int code16_base, u_int data_base, u_int code_limit, u_int data_limit)
+{
+	/* setup 32bit code segment */
+	gdt_segs[GAPMCODE32_SEL].ssd_base  = code32_base;
+	gdt_segs[GAPMCODE32_SEL].ssd_limit = code_limit;
+
+	/* setup 16bit code segment */
+	gdt_segs[GAPMCODE16_SEL].ssd_base  = code16_base;
+	gdt_segs[GAPMCODE16_SEL].ssd_limit = code_limit;
+
+	/* setup data segment */
+	gdt_segs[GAPMDATA_SEL  ].ssd_base  = data_base;
+	gdt_segs[GAPMDATA_SEL  ].ssd_limit = data_limit;
+
+	/* reflect these changes on physical GDT */
+	ssdtosd(gdt_segs + GAPMCODE32_SEL, &gdt[GAPMCODE32_SEL].sd);
+	ssdtosd(gdt_segs + GAPMCODE16_SEL, &gdt[GAPMCODE16_SEL].sd);
+	ssdtosd(gdt_segs + GAPMDATA_SEL  , &gdt[GAPMDATA_SEL  ].sd);
+}
+
+/* 48bit far pointer */
+static struct addr48 {
+	u_long		offset;
+	u_short		segment;
+} apm_addr;
+
+static int apm_errno;
+
+inline
+int
+apm_int(u_long *eax, u_long *ebx, u_long *ecx)
+{
+	u_long cf;
+	__asm __volatile("
+		pushfl
+		cli
+		lcall	_apm_addr
+		movl	$0, %3
+		jnc	1f
+		incl	%3
+	1:
+		popfl
+		"
+		: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
+		: "0" (*eax),  "1" (*ebx),  "2" (*ecx)
+		: "dx", "si", "memory"
+		);
+	apm_errno = ((*eax) >> 8) & 0xff;
+	return cf;
+}
+
+
+/* enable/disable power management */
+static int
+apm_enable_disable_pm(struct apm_softc *sc, int enable)
+{
+	u_long eax, ebx, ecx;
+
+	eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
+
+	if (sc->intversion >= INTVERSION(1, 1)) {
+		ebx  = PMDV_ALLDEV;
+	} else {
+		ebx  = 0xffff;	/* APM version 1.0 only */
+	}
+	ecx  = enable;
+	return apm_int(&eax, &ebx, &ecx);
+}
+
+/* Tell APM-BIOS that WE will do 1.1 and see what they say... */
+static void
+apm_driver_version(void)
+{
+	u_long eax, ebx, ecx;
+
+	eax = (APM_BIOS << 8) | APM_DRVVERSION;
+	ebx  = 0x0;
+	ecx  = 0x0101;
+	if(!apm_int(&eax, &ebx, &ecx))
+		apm_version = eax & 0xffff;
+}
+
+/* engage/disengage power management (APM 1.1 or later) */
+static int
+apm_engage_disengage_pm(struct apm_softc *sc, int engage)
+{
+	u_long eax, ebx, ecx;
+
+	eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
+	ebx = PMDV_ALLDEV;
+	ecx = engage;
+	return(apm_int(&eax, &ebx, &ecx));
+}
+
+/* get PM event */
+static u_int
+apm_getevent(struct apm_softc *sc)
+{
+	u_long eax, ebx, ecx;
+
+	eax = (APM_BIOS << 8) | APM_GETPMEVENT;
+
+	ebx = 0;
+	ecx = 0;
+	if (apm_int(&eax, &ebx, &ecx))
+		return PMEV_NOEVENT;
+
+	return ebx & 0xffff;
+}
+
+/* suspend entire system */
+static int
+apm_suspend_system(struct apm_softc *sc)
+{
+	u_long eax, ebx, ecx;
+
+	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
+	ebx = PMDV_ALLDEV;
+	ecx = PMST_SUSPEND;
+
+	if (apm_int(&eax, &ebx, &ecx)) {
+		printf("Entire system suspend failure: errcode = %ld\n",
+			0xff & (eax >> 8));
+		return 1;
+	}
+	return 0;
+}
+
+/* Display control */
+/*
+ * Experimental implementation: My laptop machine can't handle this function
+ * If your laptop can control the display via APM, please inform me.
+ *                            HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
+ */
+static int
+apm_display_off(void)
+{
+	u_long eax, ebx, ecx;
+
+	eax = (APM_BIOS << 8) | APM_SETPWSTATE;
+	ebx = PMDV_2NDSTORAGE0;
+	ecx = PMST_STANDBY;
+	if (apm_int(&eax, &ebx, &ecx)) {
+		printf("Display off failure: errcode = %ld\n",
+			0xff & (eax >> 8));
+		return 1;
+	}
+
+	return 0;
+}
+
+/* APM Battery low handler */
+static void
+apm_battery_low(struct apm_softc *sc)
+{
+	printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
+}
+
+/* APM hook manager */
+static struct apmhook *
+apm_add_hook(struct apmhook **list, struct apmhook *ah)
+{
+	int s;
+	struct apmhook *p, *prev;
+
+#ifdef APM_DEBUG
+	printf("Add hook \"%s\"\n", ah->ah_name);
+#endif
+
+	s = splhigh();
+	if (ah == NULL) {
+		panic("illegal apm_hook!");
+	}
+	prev = NULL;
+	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
+		if (p->ah_order > ah->ah_order) {
+			break;
+		}
+	}
+
+	if (prev == NULL) {
+		ah->ah_next = *list;
+		*list = ah;
+	} else {
+		ah->ah_next = prev->ah_next;
+		prev->ah_next = ah;
+	}
+	splx(s);
+	return ah;
+}
+
+static void
+apm_del_hook(struct apmhook **list, struct apmhook *ah)
+{
+	int s;
+	struct apmhook *p, *prev;
+
+	s = splhigh();
+	prev = NULL;
+	for (p = *list; p != NULL; prev = p, p = p->ah_next) {
+		if (p == ah) {
+			goto deleteit;
+		}
+	}
+	panic("Tried to delete unregistered apm_hook.");
+	goto nosuchnode;
+deleteit:
+	if (prev != NULL) {
+		prev->ah_next = p->ah_next;
+	} else {
+		*list = p->ah_next;
+	}
+nosuchnode:
+	splx(s);
+}
+
+
+/* APM driver calls some functions automatically */
+static void
+apm_execute_hook(struct apmhook *list)
+{
+	struct apmhook *p;
+
+	for (p = list; p != NULL; p = p->ah_next) {
+#ifdef APM_DEBUG
+		printf("Execute APM hook \"%s.\"\n", p->ah_name);
+#endif
+		if ((*(p->ah_fun))(p->ah_arg)) {
+			printf("Warning: APM hook \"%s\" failed", p->ah_name);
+		}
+	}
+}
+
+
+/* establish an apm hook */
+struct apmhook *
+apm_hook_establish(int apmh, struct apmhook *ah)
+{
+	if (apmh < 0 || apmh >= NAPM_HOOK)
+		return NULL;
+
+	return apm_add_hook(&hook[apmh], ah);
+}
+
+/* disestablish an apm hook */
+void
+apm_hook_disestablish(int apmh, struct apmhook *ah)
+{
+	if (apmh < 0 || apmh >= NAPM_HOOK)
+		return;
+
+	apm_del_hook(&hook[apmh], ah);
+}
+
+
+static struct timeval suspend_time;
+static struct timeval diff_time;
+
+static int
+apm_default_resume(void *arg)
+{
+	int pl;
+	u_int second, minute, hour;
+	struct timeval resume_time, tmp_time;
+
+	/* modified for adjkerntz */
+	pl = splsoftclock();
+	inittodr(0);			/* adjust time to RTC */
+	microtime(&resume_time);
+	tmp_time = time;		/* because 'time' is volatile */
+	timevaladd(&tmp_time, &diff_time);
+	time = tmp_time;
+	splx(pl);
+	second = resume_time.tv_sec - suspend_time.tv_sec;
+	hour = second / 3600;
+	second %= 3600;
+	minute = second / 60;
+	second %= 60;
+	log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n",
+		hour, minute, second);
+	return 0;
+}
+
+static int
+apm_default_suspend(void *arg)
+{
+	int	pl;
+
+	pl = splsoftclock();
+	microtime(&diff_time);
+	inittodr(0);
+	microtime(&suspend_time);
+	timevalsub(&diff_time, &suspend_time);
+	splx(pl);
+	return 0;
+}
+
+static void apm_processevent(struct apm_softc *);
+
+/*
+ * Public interface to the suspend/resume:
+ *
+ * Execute suspend and resume hook before and after sleep, respectively.
+ *
+ */
+
+void
+apm_suspend(void)
+{
+	struct apm_softc *sc = &apm_softc;
+
+	if (!sc)
+		return;
+
+	if (sc->initialized) {
+		apm_execute_hook(hook[APM_HOOK_SUSPEND]);
+		apm_suspend_system(sc);
+		apm_processevent(sc);
+	}
+}
+
+void
+apm_resume(void)
+{
+	struct apm_softc *sc = &apm_softc;
+
+	if (!sc)
+		return;
+
+	if (sc->initialized) {
+		apm_execute_hook(hook[APM_HOOK_RESUME]);
+	}
+}
+
+
+/* get APM information */
+static int
+apm_get_info(struct apm_softc *sc, apm_info_t aip)
+{
+	u_long eax, ebx, ecx;
+
+	eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
+	ebx = PMDV_ALLDEV;
+	ecx = 0;
+
+	if (apm_int(&eax, &ebx, &ecx))
+		return 1;
+
+	aip->ai_acline    = (ebx >> 8) & 0xff;
+	aip->ai_batt_stat = ebx & 0xff;
+	aip->ai_batt_life = ecx & 0xff;
+	aip->ai_major     = (u_int)sc->majorversion;
+	aip->ai_minor     = (u_int)sc->minorversion;
+	aip->ai_status    = (u_int)sc->active;
+
+	return 0;
+}
+
+
+/* inform APM BIOS that CPU is idle */
+void
+apm_cpu_idle(void)
+{
+	struct apm_softc *sc = &apm_softc;
+
+	if (sc->active) {
+		u_long eax, ebx, ecx;
+
+		eax = (APM_BIOS <<8) | APM_CPUIDLE;
+		ecx = ebx = 0;
+		apm_int(&eax, &ebx, &ecx);
+	}
+	/*
+	 * Some APM implementation halts CPU in BIOS, whenever
+	 * "CPU-idle" function are invoked, but swtch() of
+	 * FreeBSD halts CPU, therefore, CPU is halted twice
+	 * in the sched loop. It makes the interrupt latency
+	 * terribly long and be able to cause a serious problem
+	 * in interrupt processing. We prevent it by removing
+	 * "hlt" operation from swtch() and managed it under
+	 * APM driver.
+	 */
+	if (!sc->active || sc->always_halt_cpu) {
+		__asm("hlt");	/* wait for interrupt */
+	}
+}
+
+/* inform APM BIOS that CPU is busy */
+void
+apm_cpu_busy(void)
+{
+	struct apm_softc *sc = &apm_softc;
+
+	/*
+	 * The APM specification says this is only necessary if your BIOS
+	 * slows down the processor in the idle task, otherwise it's not
+	 * necessary.
+	 */
+	if (sc->slow_idle_cpu && sc->active) {
+		u_long eax, ebx, ecx;
+
+		eax = (APM_BIOS <<8) | APM_CPUBUSY;
+		ecx = ebx = 0;
+		apm_int(&eax, &ebx, &ecx);
+	}
+}
+
+
+/*
+ * APM timeout routine:
+ *
+ * This routine is automatically called by timer once per second.
+ */
+
+static void
+apm_timeout(void *arg)
+{
+	struct apm_softc *sc = arg;
+
+	apm_processevent(sc);
+	if (sc->active == 1) {
+		timeout(apm_timeout, (void *)sc, hz - 1 );  /* More than 1 Hz */
+	}
+}
+
+/* enable APM BIOS */
+static void
+apm_event_enable(struct apm_softc *sc)
+{
+#ifdef APM_DEBUG
+	printf("called apm_event_enable()\n");
+#endif
+	if (sc->initialized) {
+		sc->active = 1;
+		apm_timeout(sc);
+	}
+}
+
+/* disable APM BIOS */
+static void
+apm_event_disable(struct apm_softc *sc)
+{
+#ifdef APM_DEBUG
+	printf("called apm_event_disable()\n");
+#endif
+	if (sc->initialized) {
+		untimeout(apm_timeout, NULL);
+		sc->active = 0;
+	}
+}
+
+/* halt CPU in scheduling loop */
+static void
+apm_halt_cpu(struct apm_softc *sc)
+{
+	if (sc->initialized) {
+		sc->always_halt_cpu = 1;
+	}
+}
+
+/* don't halt CPU in scheduling loop */
+static void
+apm_not_halt_cpu(struct apm_softc *sc)
+{
+	if (sc->initialized) {
+		sc->always_halt_cpu = 0;
+	}
+}
+
+/* device driver definitions */
+#ifdef PC98
+static int apmprobe (struct pc98_device *);
+static int apmattach(struct pc98_device *);
+struct pc98_driver apmdriver = {
+#else
+static int apmprobe (struct isa_device *);
+static int apmattach(struct isa_device *);
+struct isa_driver apmdriver = {
+#endif
+	apmprobe, apmattach, "apm" };
+
+/*
+ * probe APM (dummy):
+ *
+ * APM probing routine is placed on locore.s and apm_init.S because
+ * this process forces the CPU to turn to real mode or V86 mode.
+ * Current version uses real mode, but on future version, we want
+ * to use V86 mode in APM initialization.
+ */
+
+static int
+#ifdef PC98
+apmprobe(struct pc98_device *dvp)
+#else
+apmprobe(struct isa_device *dvp)
+#endif
+{
+	if ( dvp->id_unit > 0 ) {
+		printf("apm: Only one APM driver supported.\n");
+		return 0;
+	}
+	apm_registerdev(dvp);
+	switch (apm_version) {
+	case APMINI_CANTFIND:
+		/* silent */
+		return 0;
+	case APMINI_NOT32BIT:
+		printf("apm: 32bit connection is not supported.\n");
+		return 0;
+	case APMINI_CONNECTERR:
+		printf("apm: 32-bit connection error.\n");
+		return 0;
+	}
+#ifdef APM_BROKEN_STATCLOCK
+	statclock_disable = 1;
+#endif
+
+	return -1;
+}
+
+
+/* Process APM event */
+static void
+apm_processevent(struct apm_softc *sc)
+{
+	int apm_event;
+
+#ifdef APM_DEBUG
+#  define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
+	printf("Received APM Event: " #symbol "\n");
+#else
+#  define OPMEV_DEBUGMESSAGE(symbol) case symbol:
+#endif
+	do {
+		apm_event = apm_getevent(sc);
+		switch (apm_event) {
+		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
+			apm_suspend();
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
+			apm_suspend();
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
+			apm_suspend();
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
+			apm_suspend();
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
+			apm_resume();
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
+			apm_resume();
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
+			apm_resume();
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
+			apm_battery_low(sc);
+			apm_suspend();
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
+			inittodr(0);	/* adjust time to RTC */
+			break;
+		    OPMEV_DEBUGMESSAGE(PMEV_NOEVENT);
+			break;
+		    default:
+			printf("Unknown Original APM Event 0x%x\n", apm_event);
+			    break;
+		}
+	} while (apm_event != PMEV_NOEVENT);
+}
+
+/*
+ * Attach APM:
+ *
+ * Initialize APM driver (APM BIOS itself has been initialized in locore.s)
+ */
+
+static int
+#ifdef PC98
+apmattach(struct pc98_device *dvp)
+#else
+apmattach(struct isa_device *dvp)
+#endif
+{
+#define APM_KERNBASE	KERNBASE
+	struct apm_softc	*sc = &apm_softc;
+#ifdef APM_DSVALUE_BUG
+	caddr_t apm_bios_work;
+
+	apm_bios_work = (caddr_t)malloc(apm_ds_limit, M_DEVBUF, M_NOWAIT);
+	bcopy((caddr_t)((apm_ds_base << 4) + APM_KERNBASE), apm_bios_work,
+		apm_ds_limit);
+#endif /* APM_DSVALUE_BUG */
+
+	sc->initialized = 0;
+
+	/* Must be externally enabled */
+	sc->active = 0;
+
+	/* setup APM parameters */
+	sc->cs16_base = (apm_cs32_base << 4) + APM_KERNBASE;
+	sc->cs32_base = (apm_cs16_base << 4) + APM_KERNBASE;
+	sc->ds_base = (apm_ds_base << 4) + APM_KERNBASE;
+	sc->cs_limit = apm_cs_limit;
+	sc->ds_limit = apm_ds_limit;
+	sc->cs_entry = apm_cs_entry;
+
+#ifdef APM_DSVALUE_BUG
+	sc->ds_base = (u_int)apm_bios_work;
+#endif /* APM_DSVALUE_BUG */
+
+	/* Always call HLT in idle loop */
+	sc->always_halt_cpu = 1;
+
+	sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
+	sc->disabled = ((apm_flags & APM_DISABLED) != 0);
+	sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
+
+	/* print bootstrap messages */
+#ifdef APM_DEBUG
+	printf("apm: APM BIOS version %04x\n",  apm_version);
+	printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
+		sc->cs32_base, sc->cs16_base, sc->ds_base);
+	printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
+		sc->cs_entry, is_enabled(sc->slow_idle_cpu),
+		is_enabled(!sc->disabled));
+	printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
+#endif /* APM_DEBUG */
+
+#ifdef APM_DEBUG
+	/* Workaround for some buggy APM BIOS implementations */
+	sc->cs_limit = 0xffff;
+	sc->ds_limit = 0xffff;
+#endif
+
+	/* setup GDT */
+	setup_apm_gdt(sc->cs32_base, sc->cs16_base, sc->ds_base,
+			sc->cs_limit, sc->ds_limit);
+
+	/* setup entry point 48bit pointer */
+	apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL);
+	apm_addr.offset  = sc->cs_entry;
+
+#ifdef FORCE_APM10
+	apm_version = 0x100;
+	sc->majorversion = 1;
+	sc->minorversion = 0;
+	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
+	printf("apm: running in APM 1.0 compatible mode\n");
+	kcd_apm.kdc_description =
+		"Advanced Power Management BIOS (1.0 compatability mode)",
+#else
+	/* Try to kick bios into 1.1 or greater mode */
+	apm_driver_version();
+	sc->minorversion = ((apm_version & 0x00f0) >>  4) * 10 +
+			((apm_version & 0x000f) >> 0);
+	sc->majorversion = ((apm_version & 0xf000) >> 12) * 10 +
+			((apm_version & 0x0f00) >> 8);
+
+	sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
+
+	if (sc->intversion >= INTVERSION(1, 1)) {
+#ifdef APM_DEBUG
+		printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
+#endif
+	}
+
+	printf("apm: found APM BIOS version %d.%d\n",
+		sc->majorversion, sc->minorversion);
+#endif /* FORCE_APM10 */
+
+#ifdef APM_DEBUG
+	printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
+#endif
+
+	/* enable power management */
+	if (sc->disabled) {
+		if (apm_enable_disable_pm(sc, 1)) {
+#ifdef APM_DEBUG
+			printf("apm: *Warning* enable function failed! [%x]\n",
+				apm_errno);
+#endif
+		}
+	}
+
+	/* engage power managment (APM 1.1 or later) */
+	if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
+		if (apm_engage_disengage_pm(sc, 1)) {
+#ifdef APM_DEBUG
+			printf("apm: *Warning* engage function failed err=[%x]",
+				apm_errno);
+			printf(" (Docked or using external power?).\n");
+#endif
+		}
+	}
+
+        /* default suspend hook */
+        sc->sc_suspend.ah_fun = apm_default_suspend;
+        sc->sc_suspend.ah_arg = sc;
+        sc->sc_suspend.ah_name = "default suspend";
+        sc->sc_suspend.ah_order = APM_MAX_ORDER;
+
+        /* default resume hook */
+        sc->sc_resume.ah_fun = apm_default_resume;
+        sc->sc_resume.ah_arg = sc;
+        sc->sc_resume.ah_name = "default resume";
+        sc->sc_resume.ah_order = APM_MIN_ORDER;
+
+        apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend);
+        apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume);
+
+	apm_event_enable(sc);
+	kdc_apm.kdc_state = DC_IDLE;
+
+	sc->initialized = 1;
+
+#ifdef DEVFS
+	sc->sc_devfs_token = 
+		devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm");
+#endif
+	return 0;
+}
+
+static int
+apmopen(dev_t dev, int flag, int fmt, struct proc *p)
+{
+	struct apm_softc *sc = &apm_softc;
+
+	if (minor(dev) != 0 || !sc->initialized)
+		return (ENXIO);
+
+	return 0;
+}
+
+static int
+apmclose(dev_t dev, int flag, int fmt, struct proc *p)
+{
+	return 0;
+}
+
+static int
+apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
+{
+	struct apm_softc *sc = &apm_softc;
+	int error = 0;
+
+	if (minor(dev) != 0 || !sc->initialized)
+		return (ENXIO);
+#ifdef APM_DEBUG
+	printf("APM ioctl: cmd = 0x%x\n", cmd);
+#endif
+	switch (cmd) {
+	case APMIO_SUSPEND:
+		if ( sc->active) {
+			apm_suspend();
+		} else {
+			error = EINVAL;
+		}
+		break;
+	case APMIO_GETINFO:
+		if (apm_get_info(sc, (apm_info_t)addr)) {
+			error = ENXIO;
+		}
+		break;
+	case APMIO_ENABLE:
+		kdc_apm.kdc_state = DC_BUSY;
+		apm_event_enable(sc);
+		break;
+	case APMIO_DISABLE:
+		kdc_apm.kdc_state = DC_IDLE;
+		apm_event_disable(sc);
+		break;
+	case APMIO_HALTCPU:
+		apm_halt_cpu(sc);
+		break;
+	case APMIO_NOTHALTCPU:
+		apm_not_halt_cpu(sc);
+		break;
+	case APMIO_DISPLAYOFF:
+		if (apm_display_off()) {
+			error = ENXIO;
+		}
+		break;
+	default:
+		error = EINVAL;
+		break;
+	}
+	return error;
+}
+
+
+static apm_devsw_installed = 0;
+
+static void
+apm_drvinit(void *unused)
+{
+	dev_t dev;
+
+	if( ! apm_devsw_installed ) {
+		dev = makedev(CDEV_MAJOR,0);
+		cdevsw_add(&dev,&apm_cdevsw,NULL);
+		apm_devsw_installed = 1;
+    	}
+}
+
+SYSINIT(apmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,apm_drvinit,NULL)