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freebsd-dev/sys/i386/apm/apm.c

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/*
* APM (Advanced Power Management) BIOS Device Driver
*
* Copyright (c) 1994 UKAI, Fumitoshi.
* Copyright (c) 1994-1995 by HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
* Copyright (c) 1996 Nate Williams <nate@FreeBSD.org>
* Copyright (c) 1997 Poul-Henning Kamp <phk@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 1.60 1997/09/21 21:33:10 gibbs Exp $
*/
#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/time.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 <i386/apm/apm_setup.h>
static int apm_display __P((int newstate));
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 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 struct callout_handle apm_timeout_ch =
CALLOUT_HANDLE_INITIALIZER(&apm_timeout_ch);
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};
/* 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 */
struct addr48 {
u_long offset;
u_short segment;
} apm_addr;
static int apm_errno;
int
apm_int(u_long *eax, u_long *ebx, u_long *ecx)
{
struct apm_bios_arg apa;
int cf;
apa.eax = *eax;
apa.ebx = *ebx;
apa.ecx = *ecx;
cf = apm_bios_call(&apa);
*eax = apa.eax;
*ebx = apa.ebx;
*ecx = apa.ecx;
apm_errno = ((*eax) >> 8) & 0xff;
return cf;
}
/* enable/disable power management */
static int
apm_enable_disable_pm(int enable)
{
struct apm_softc *sc = &apm_softc;
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);
}
static void
apm_driver_version(int version)
{
u_long eax, ebx, ecx;
/* First try APM 1.2 */
eax = (APM_BIOS << 8) | APM_DRVVERSION;
ebx = 0x0;
ecx = version;
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(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(void)
{
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(void)
{
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@jp.FreeBSD.org>
*/
static int
apm_display(int newstate)
{
u_long eax, ebx, ecx;
eax = (APM_BIOS << 8) | APM_SETPWSTATE;
ebx = PMDV_DISP0;
ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
if (apm_int(&eax, &ebx, &ecx)) {
printf("Display off failure: errcode = %ld\n",
0xff & (eax >> 8));
return 1;
}
return 0;
}
/*
* Turn off the entire system.
*/
void
apm_power_off(void)
{
u_long eax, ebx, ecx;
if (!apm_softc.active)
return;
eax = (APM_BIOS << 8) | APM_SETPWSTATE;
ebx = PMDV_ALLDEV;
ecx = PMST_OFF;
apm_int(&eax, &ebx, &ecx);
}
/* APM Battery low handler */
static void
apm_battery_low(void)
{
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(void);
/*
* 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();
apm_processevent();
}
}
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(apm_info_t aip)
{
struct apm_softc *sc = &apm_softc;
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 *dummy)
{
struct apm_softc *sc = &apm_softc;
apm_processevent();
if (sc->active == 1)
/* Run slightly more oftan than 1 Hz */
apm_timeout_ch = timeout(apm_timeout, NULL, hz - 1 );
}
/* enable APM BIOS */
static void
apm_event_enable(void)
{
struct apm_softc *sc = &apm_softc;
#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(void)
{
struct apm_softc *sc = &apm_softc;
#ifdef APM_DEBUG
printf("called apm_event_disable()\n");
#endif
if (sc->initialized) {
untimeout(apm_timeout, NULL, apm_timeout_ch);
sc->active = 0;
}
}
/* halt CPU in scheduling loop */
static void
apm_halt_cpu(void)
{
struct apm_softc *sc = &apm_softc;
if (sc->initialized)
sc->always_halt_cpu = 1;
}
/* don't halt CPU in scheduling loop */
static void
apm_not_halt_cpu(void)
{
struct apm_softc *sc = &apm_softc;
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 in a future version, we want
* to use V86 mode in APM initialization.
*/
static int
apmprobe(struct isa_device *dvp)
{
bzero(&apm_softc, sizeof(apm_softc));
if ( dvp->id_unit > 0 ) {
printf("apm: Only one APM driver supported.\n");
return 0;
}
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;
}
if (dvp->id_flags & 0x20)
statclock_disable = 1;
return -1;
}
/* Process APM event */
static void
apm_processevent(void)
{
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();
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();
apm_suspend();
break;
OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
break;
OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
inittodr(0); /* adjust time to RTC */
break;
case 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
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_cs16_base << 4) + APM_KERNBASE;
sc->cs32_base = (apm_cs32_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("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=0x%x, DS_limit=0x%x\n",
sc->cs_limit, sc->ds_limit);
#endif /* APM_DEBUG */
#if 0
/* 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;
if ((dvp->id_flags & 0x10)) {
if ((dvp->id_flags & 0xf) >= 0x2) {
apm_driver_version(0x102);
}
if (!apm_version && (dvp->id_flags & 0xf) >= 0x1) {
apm_driver_version(0x101);
}
} else {
apm_driver_version(0x102);
if (!apm_version)
apm_driver_version(0x101);
}
if (!apm_version)
apm_version = 0x100;
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);
#ifdef APM_DEBUG
if (sc->intversion >= INTVERSION(1, 1))
printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
#endif
printf("apm: found APM BIOS version %d.%d\n",
sc->majorversion, sc->minorversion);
#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(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(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->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;
int newstate;
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((apm_info_t)addr))
error = ENXIO;
break;
case APMIO_ENABLE:
apm_event_enable();
break;
case APMIO_DISABLE:
apm_event_disable();
break;
case APMIO_HALTCPU:
apm_halt_cpu();
break;
case APMIO_NOTHALTCPU:
apm_not_halt_cpu();
break;
case APMIO_DISPLAY:
newstate = *(int *)addr;
if (apm_display(newstate))
error = ENXIO;
break;
case APMIO_BIOS:
if (apm_bios_call((struct apm_bios_arg*)addr))
error = EIO;
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)
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