freebsd-dev/sys/i386/apm/apm.c
1996-03-28 14:29:52 +00:00

903 lines
19 KiB
C

/*
* 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>
*
* 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 1.36 1996/03/19 16:56:56 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>
#include "i386/isa/isa.h"
#include "i386/isa/isa_device.h"
#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 */
"APM 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_description = "APM BIOS";
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 ("pushl %%ebp
pushl %%edx
pushl %%esi
xorl %3,%3
movl %3,%%esi
lcall _apm_addr
jnc 1f
incl %3
1:
popl %%esi
popl %%edx
popl %%ebp"
: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=D" (cf)
: "0" (*eax), "1" (*ebx), "2" (*ecx)
);
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;
#ifdef APM_DEBUG
eax = (APM_BIOS<<8) | APM_INSTCHECK;
ebx = 0x0;
ecx = 0x0101;
i = apm_int(&eax, &ebx, &ecx);
printf("[%04lx %04lx %04lx %ld %02x]\n",
eax, ebx, ecx, i, apm_errno);
#endif
eax = (APM_BIOS << 8) | APM_DRVVERSION;
ebx = 0x0;
ecx = 0x0101;
if(!apm_int(&eax, &ebx, &ecx))
apm_version = eax & 0xffff;
#ifdef APM_DEBUG
eax = (APM_BIOS << 8) | APM_INSTCHECK;
ebx = 0x0;
ecx = 0x0101;
i = apm_int(&eax, &ebx, &ecx);
printf("[%04lx %04lx %04lx %ld %02x]\n",
eax, ebx, ecx, i, apm_errno);
#endif
}
/* 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, i;
eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
ebx = PMDV_ALLDEV;
ecx = engage;
i = apm_int(&eax, &ebx, &ecx);
return i;
}
/* 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;
__asm("cli");
if (apm_int(&eax, &ebx, &ecx)) {
__asm("sti");
printf("Entire system suspend failure: errcode = %ld\n",
0xff & (eax >> 8));
return 1;
}
__asm("sti");
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;
#if 0
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) {
#if 0
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);
}
#ifdef notused
/* 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);
}
#endif /* notused */
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 */
static int apmprobe (struct isa_device *);
static int apmattach(struct isa_device *);
struct isa_driver apmdriver = {
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
apmprobe(struct isa_device *dvp)
{
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;
}
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("Original APM Event: " #symbol "\n");
#else
# define OPMEV_DEBUGMESSAGE(symbol) case symbol:
#endif
while (1) {
apm_event = apm_getevent(sc);
if (apm_event == PMEV_NOEVENT)
break;
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;
default:
printf("Unknown Original APM Event 0x%x\n", apm_event);
break;
}
}
}
/*
* Attach APM:
*
* Initialize APM driver (APM BIOS itself has been initialized in locore.s)
*/
static int
apmattach(struct isa_device *dvp)
{
#define APM_KERNBASE KERNBASE
struct apm_softc *sc = &apm_softc;
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;
/* 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(" found 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 */
/* Workaround for some buggy APM BIOS implementations */
sc->cs_limit = 0xffff;
sc->ds_limit = 0xffff;
/* 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;
/* Try to kick bios into 1.1 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)) {
printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
}
printf(" found APM BIOS version %d.%d\n",
sc->majorversion, sc->minorversion);
printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
/* enable power management */
if (sc->disabled) {
if (apm_enable_disable_pm(sc, 1)) {
printf("Warning: APM enable function failed! [%x]\n",
apm_errno);
}
}
/* engage power managment (APM 1.1 or later) */
if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
if (apm_engage_disengage_pm(sc, 1)) {
printf("Warning: APM engage function failed [%x]\n",
apm_errno);
}
}
/* 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)