apm.c revision 50107
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@jp.FreeBSD.org> 6 * Copyright (c) 1996 Nate Williams <nate@FreeBSD.org> 7 * Copyright (c) 1997 Poul-Henning Kamp <phk@FreeBSD.org> 8 * 9 * This software may be used, modified, copied, and distributed, in 10 * both source and binary form provided that the above copyright and 11 * these terms are retained. Under no circumstances is the author 12 * responsible for the proper functioning of this software, nor does 13 * the author assume any responsibility for damages incurred with its 14 * use. 15 * 16 * Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD) 17 * 18 * $Id: apm.c,v 1.99 1999/08/14 18:39:40 iwasaki Exp $ 19 */ 20 21#include "opt_devfs.h" 22 23#include <sys/param.h> 24#include <sys/systm.h> 25#include <sys/eventhandler.h> 26#include <sys/conf.h> 27#include <sys/kernel.h> 28#ifdef DEVFS 29#include <sys/devfsext.h> 30#endif /*DEVFS*/ 31#include <sys/time.h> 32#include <sys/reboot.h> 33#include <sys/bus.h> 34#include <sys/select.h> 35#include <sys/poll.h> 36#include <sys/fcntl.h> 37#include <sys/proc.h> 38#include <sys/uio.h> 39#include <sys/signalvar.h> 40#include <machine/apm_bios.h> 41#include <machine/segments.h> 42#include <machine/clock.h> 43#include <vm/vm.h> 44#include <vm/vm_param.h> 45#include <vm/pmap.h> 46#include <sys/syslog.h> 47 48#include <machine/pc/bios.h> 49#include <machine/vm86.h> 50 51static int apm_display __P((int newstate)); 52static void apm_resume __P((void)); 53static int apm_bioscall(void); 54static int apm_check_function_supported __P((u_int version, u_int func)); 55 56static u_long apm_version; 57 58#define APM_NEVENTS 16 59#define APM_NPMEV 13 60 61int apm_evindex; 62 63/* static data */ 64struct apm_softc { 65 int initialized, active, bios_busy; 66 int always_halt_cpu, slow_idle_cpu; 67 int disabled, disengaged; 68 u_int minorversion, majorversion; 69 u_int intversion, connectmode; 70 struct bios_args bios; 71 struct apmhook sc_suspend; 72 struct apmhook sc_resume; 73 struct selinfo sc_rsel; 74 int sc_flags; 75 int event_count; 76 int event_ptr; 77 struct apm_event_info event_list[APM_NEVENTS]; 78 u_char event_filter[APM_NPMEV]; 79#ifdef DEVFS 80 void *sc_devfs_token; 81#endif 82}; 83#define SCFLAG_ONORMAL 0x0000001 84#define SCFLAG_OCTL 0x0000002 85#define SCFLAG_OPEN (SCFLAG_ONORMAL|SCFLAG_OCTL) 86 87#define APMDEV(dev) (minor(dev)&0x0f) 88#define APMDEV_NORMAL 0 89#define APMDEV_CTL 8 90 91static struct apm_softc apm_softc; 92static struct apmhook *hook[NAPM_HOOK]; /* XXX */ 93 94#define is_enabled(foo) ((foo) ? "enabled" : "disabled") 95 96/* Map version number to integer (keeps ordering of version numbers) */ 97#define INTVERSION(major, minor) ((major)*100 + (minor)) 98 99static struct callout_handle apm_timeout_ch = 100 CALLOUT_HANDLE_INITIALIZER(&apm_timeout_ch); 101 102static timeout_t apm_timeout; 103static d_open_t apmopen; 104static d_close_t apmclose; 105static d_write_t apmwrite; 106static d_ioctl_t apmioctl; 107static d_poll_t apmpoll; 108 109#define CDEV_MAJOR 39 110static struct cdevsw apm_cdevsw = { 111 /* open */ apmopen, 112 /* close */ apmclose, 113 /* read */ noread, 114 /* write */ apmwrite, 115 /* ioctl */ apmioctl, 116 /* stop */ nostop, 117 /* reset */ noreset, 118 /* devtotty */ nodevtotty, 119 /* poll */ apmpoll, 120 /* mmap */ nommap, 121 /* strategy */ nostrategy, 122 /* name */ "apm", 123 /* parms */ noparms, 124 /* maj */ CDEV_MAJOR, 125 /* dump */ nodump, 126 /* psize */ nopsize, 127 /* flags */ 0, 128 /* maxio */ 0, 129 /* bmaj */ -1 130}; 131 132/* 133 * return 0 if the function successfull, 134 * return 1 if the function unsuccessfull, 135 * return -1 if the function unsupported. 136 */ 137static int 138apm_bioscall(void) 139{ 140 struct apm_softc *sc = &apm_softc; 141 int errno = 0; 142 u_int apm_func = sc->bios.r.eax & 0xff; 143 144 if (!apm_check_function_supported(sc->intversion, apm_func)) { 145#ifdef APM_DEBUG 146 printf("apm_bioscall: function 0x%x is not supported in v%d.%d\n", 147 apm_func, sc->majorversion, sc->minorversion); 148#endif 149 return (-1); 150 } 151 152 sc->bios_busy = 1; 153 if (sc->connectmode == APM_PROT32CONNECT) { 154 set_bios_selectors(&sc->bios.seg, 155 BIOSCODE_FLAG | BIOSDATA_FLAG); 156 errno = bios32(&sc->bios.r, 157 sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL)); 158 } else { 159 errno = bios16(&sc->bios, NULL); 160 } 161 sc->bios_busy = 0; 162 return (errno); 163} 164 165/* check whether APM function is supported (1) or not (0). */ 166static int 167apm_check_function_supported(u_int version, u_int func) 168{ 169 /* except driver version */ 170 if (func == APM_DRVVERSION) { 171 return (1); 172 } 173 174 switch (version) { 175 case INTVERSION(1, 0): 176 if (func > APM_GETPMEVENT) { 177 return (0); /* not supported */ 178 } 179 break; 180 case INTVERSION(1, 1): 181 if (func > APM_ENGAGEDISENGAGEPM && 182 func < APM_OEMFUNC) { 183 return (0); /* not supported */ 184 } 185 break; 186 case INTVERSION(1, 2): 187 break; 188 } 189 190 return (1); /* supported */ 191} 192 193/* enable/disable power management */ 194static int 195apm_enable_disable_pm(int enable) 196{ 197 struct apm_softc *sc = &apm_softc; 198 199 sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM; 200 201 if (sc->intversion >= INTVERSION(1, 1)) 202 sc->bios.r.ebx = PMDV_ALLDEV; 203 else 204 sc->bios.r.ebx = 0xffff; /* APM version 1.0 only */ 205 sc->bios.r.ecx = enable; 206 sc->bios.r.edx = 0; 207 return (apm_bioscall()); 208} 209 210/* register driver version (APM 1.1 or later) */ 211static int 212apm_driver_version(int version) 213{ 214 struct apm_softc *sc = &apm_softc; 215 216 sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION; 217 sc->bios.r.ebx = 0x0; 218 sc->bios.r.ecx = version; 219 sc->bios.r.edx = 0; 220 221 if (apm_bioscall() == 0 && sc->bios.r.eax == version) 222 return (0); 223 224 /* Some old BIOSes don't return the connection version in %ax. */ 225 if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION)) 226 return (0); 227 228 return (1); 229} 230 231/* engage/disengage power management (APM 1.1 or later) */ 232static int 233apm_engage_disengage_pm(int engage) 234{ 235 struct apm_softc *sc = &apm_softc; 236 237 sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM; 238 sc->bios.r.ebx = PMDV_ALLDEV; 239 sc->bios.r.ecx = engage; 240 sc->bios.r.edx = 0; 241 return (apm_bioscall()); 242} 243 244/* get PM event */ 245static u_int 246apm_getevent(void) 247{ 248 struct apm_softc *sc = &apm_softc; 249 250 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT; 251 252 sc->bios.r.ebx = 0; 253 sc->bios.r.ecx = 0; 254 sc->bios.r.edx = 0; 255 if (apm_bioscall()) 256 return (PMEV_NOEVENT); 257 return (sc->bios.r.ebx & 0xffff); 258} 259 260/* suspend entire system */ 261static int 262apm_suspend_system(int state) 263{ 264 struct apm_softc *sc = &apm_softc; 265 266 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 267 sc->bios.r.ebx = PMDV_ALLDEV; 268 sc->bios.r.ecx = state; 269 sc->bios.r.edx = 0; 270 271 if (apm_bioscall()) { 272 printf("Entire system suspend failure: errcode = %d\n", 273 0xff & (sc->bios.r.eax >> 8)); 274 return 1; 275 } 276 return 0; 277} 278 279/* Display control */ 280/* 281 * Experimental implementation: My laptop machine can't handle this function 282 * If your laptop can control the display via APM, please inform me. 283 * HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org> 284 */ 285static int 286apm_display(int newstate) 287{ 288 struct apm_softc *sc = &apm_softc; 289 290 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 291 sc->bios.r.ebx = PMDV_DISP0; 292 sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND; 293 sc->bios.r.edx = 0; 294 if (apm_bioscall()) { 295 printf("Display off failure: errcode = %d\n", 296 0xff & (sc->bios.r.eax >> 8)); 297 return 1; 298 } 299 return 0; 300} 301 302/* 303 * Turn off the entire system. 304 */ 305static void 306apm_power_off(void *junk, int howto) 307{ 308 struct apm_softc *sc = &apm_softc; 309 310 /* Not halting powering off, or not active */ 311 if (!(howto & RB_POWEROFF) || !apm_softc.active) 312 return; 313 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 314 sc->bios.r.ebx = PMDV_ALLDEV; 315 sc->bios.r.ecx = PMST_OFF; 316 sc->bios.r.edx = 0; 317 (void) apm_bioscall(); 318} 319 320/* APM Battery low handler */ 321static void 322apm_battery_low(void) 323{ 324 printf("\007\007 * * * BATTERY IS LOW * * * \007\007"); 325} 326 327/* APM hook manager */ 328static struct apmhook * 329apm_add_hook(struct apmhook **list, struct apmhook *ah) 330{ 331 int s; 332 struct apmhook *p, *prev; 333 334#ifdef APM_DEBUG 335 printf("Add hook \"%s\"\n", ah->ah_name); 336#endif 337 338 s = splhigh(); 339 if (ah == NULL) 340 panic("illegal apm_hook!"); 341 prev = NULL; 342 for (p = *list; p != NULL; prev = p, p = p->ah_next) 343 if (p->ah_order > ah->ah_order) 344 break; 345 346 if (prev == NULL) { 347 ah->ah_next = *list; 348 *list = ah; 349 } else { 350 ah->ah_next = prev->ah_next; 351 prev->ah_next = ah; 352 } 353 splx(s); 354 return ah; 355} 356 357static void 358apm_del_hook(struct apmhook **list, struct apmhook *ah) 359{ 360 int s; 361 struct apmhook *p, *prev; 362 363 s = splhigh(); 364 prev = NULL; 365 for (p = *list; p != NULL; prev = p, p = p->ah_next) 366 if (p == ah) 367 goto deleteit; 368 panic("Tried to delete unregistered apm_hook."); 369 goto nosuchnode; 370deleteit: 371 if (prev != NULL) 372 prev->ah_next = p->ah_next; 373 else 374 *list = p->ah_next; 375nosuchnode: 376 splx(s); 377} 378 379 380/* APM driver calls some functions automatically */ 381static void 382apm_execute_hook(struct apmhook *list) 383{ 384 struct apmhook *p; 385 386 for (p = list; p != NULL; p = p->ah_next) { 387#ifdef APM_DEBUG 388 printf("Execute APM hook \"%s.\"\n", p->ah_name); 389#endif 390 if ((*(p->ah_fun))(p->ah_arg)) 391 printf("Warning: APM hook \"%s\" failed", p->ah_name); 392 } 393} 394 395 396/* establish an apm hook */ 397struct apmhook * 398apm_hook_establish(int apmh, struct apmhook *ah) 399{ 400 if (apmh < 0 || apmh >= NAPM_HOOK) 401 return NULL; 402 403 return apm_add_hook(&hook[apmh], ah); 404} 405 406/* disestablish an apm hook */ 407void 408apm_hook_disestablish(int apmh, struct apmhook *ah) 409{ 410 if (apmh < 0 || apmh >= NAPM_HOOK) 411 return; 412 413 apm_del_hook(&hook[apmh], ah); 414} 415 416 417static struct timeval suspend_time; 418static struct timeval diff_time; 419 420static int 421apm_default_resume(void *arg) 422{ 423 int pl; 424 u_int second, minute, hour; 425 struct timeval resume_time, tmp_time; 426 427 /* modified for adjkerntz */ 428 pl = splsoftclock(); 429 inittodr(0); /* adjust time to RTC */ 430 microtime(&resume_time); 431 getmicrotime(&tmp_time); 432 timevaladd(&tmp_time, &diff_time); 433 434#ifdef FIXME 435 /* XXX THIS DOESN'T WORK!!! */ 436 time = tmp_time; 437#endif 438 439#ifdef APM_FIXUP_CALLTODO 440 /* Calculate the delta time suspended */ 441 timevalsub(&resume_time, &suspend_time); 442 /* Fixup the calltodo list with the delta time. */ 443 adjust_timeout_calltodo(&resume_time); 444#endif /* APM_FIXUP_CALLTODOK */ 445 splx(pl); 446#ifndef APM_FIXUP_CALLTODO 447 second = resume_time.tv_sec - suspend_time.tv_sec; 448#else /* APM_FIXUP_CALLTODO */ 449 /* 450 * We've already calculated resume_time to be the delta between 451 * the suspend and the resume. 452 */ 453 second = resume_time.tv_sec; 454#endif /* APM_FIXUP_CALLTODO */ 455 hour = second / 3600; 456 second %= 3600; 457 minute = second / 60; 458 second %= 60; 459 log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n", 460 hour, minute, second); 461 return 0; 462} 463 464static int 465apm_default_suspend(void *arg) 466{ 467 int pl; 468 469 pl = splsoftclock(); 470 microtime(&diff_time); 471 inittodr(0); 472 microtime(&suspend_time); 473 timevalsub(&diff_time, &suspend_time); 474 splx(pl); 475 return 0; 476} 477 478static int apm_record_event __P((struct apm_softc *, u_int)); 479static void apm_processevent(void); 480 481static u_int apm_op_inprog = 0; 482 483static void 484apm_lastreq_notify(void) 485{ 486 struct apm_softc *sc = &apm_softc; 487 488 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 489 sc->bios.r.ebx = PMDV_ALLDEV; 490 sc->bios.r.ecx = PMST_LASTREQNOTIFY; 491 sc->bios.r.edx = 0; 492 apm_bioscall(); 493} 494 495static int 496apm_lastreq_rejected(void) 497{ 498 struct apm_softc *sc = &apm_softc; 499 500 if (apm_op_inprog == 0) { 501 return 1; /* no operation in progress */ 502 } 503 504 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 505 sc->bios.r.ebx = PMDV_ALLDEV; 506 sc->bios.r.ecx = PMST_LASTREQREJECT; 507 sc->bios.r.edx = 0; 508 509 if (apm_bioscall()) { 510#ifdef APM_DEBUG 511 printf("apm_lastreq_rejected: failed\n"); 512#endif 513 return 1; 514 } 515 apm_op_inprog = 0; 516 return 0; 517} 518 519/* 520 * Public interface to the suspend/resume: 521 * 522 * Execute suspend and resume hook before and after sleep, respectively. 523 * 524 */ 525 526void 527apm_suspend(int state) 528{ 529 struct apm_softc *sc = &apm_softc; 530 int error; 531 532 if (!sc) 533 return; 534 535 apm_op_inprog = 0; 536 537 if (sc->initialized) { 538 error = DEVICE_SUSPEND(root_bus); 539 /* 540 * XXX Shouldn't ignore the error like this, but should 541 * instead fix the newbus code. Until that happens, 542 * I'm doing this to get suspend working again. 543 */ 544 if (error) 545 printf("DEVICE_SUSPEND error %d, ignored\n", error); 546 apm_execute_hook(hook[APM_HOOK_SUSPEND]); 547 if (apm_suspend_system(state) == 0) 548 apm_processevent(); 549 else 550 /* Failure, 'resume' the system again */ 551 apm_execute_hook(hook[APM_HOOK_RESUME]); 552 } 553} 554 555void 556apm_resume(void) 557{ 558 struct apm_softc *sc = &apm_softc; 559 560 if (!sc) 561 return; 562 563 if (sc->initialized) { 564 DEVICE_RESUME(root_bus); 565 apm_execute_hook(hook[APM_HOOK_RESUME]); 566 } 567} 568 569 570/* get APM information */ 571static int 572apm_get_info(apm_info_t aip) 573{ 574 struct apm_softc *sc = &apm_softc; 575 576 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS; 577 sc->bios.r.ebx = PMDV_ALLDEV; 578 sc->bios.r.ecx = 0; 579 sc->bios.r.edx = 0xffff; /* default to unknown battery time */ 580 581 if (apm_bioscall()) 582 return 1; 583 584 aip->ai_infoversion = 1; 585 aip->ai_acline = (sc->bios.r.ebx >> 8) & 0xff; 586 aip->ai_batt_stat = sc->bios.r.ebx & 0xff; 587 aip->ai_batt_life = sc->bios.r.ecx & 0xff; 588 aip->ai_major = (u_int)sc->majorversion; 589 aip->ai_minor = (u_int)sc->minorversion; 590 aip->ai_status = (u_int)sc->active; 591 sc->bios.r.edx &= 0xffff; 592 if (sc->bios.r.edx == 0xffff) /* Time is unknown */ 593 aip->ai_batt_time = -1; 594 else if (sc->bios.r.edx & 0x8000) /* Time is in minutes */ 595 aip->ai_batt_time = (sc->bios.r.edx & 0x7fff) * 60; 596 else /* Time is in seconds */ 597 aip->ai_batt_time = sc->bios.r.edx; 598 599 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES; 600 sc->bios.r.ebx = 0; 601 sc->bios.r.ecx = 0; 602 sc->bios.r.edx = 0; 603 if (apm_bioscall()) { 604 aip->ai_batteries = -1; /* Unknown */ 605 aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */ 606 } else { 607 aip->ai_batteries = sc->bios.r.ebx & 0xff; 608 aip->ai_capabilities = sc->bios.r.ecx & 0xf; 609 } 610 611 bzero(aip->ai_spare, sizeof aip->ai_spare); 612 613 return 0; 614} 615 616 617/* inform APM BIOS that CPU is idle */ 618void 619apm_cpu_idle(void) 620{ 621 struct apm_softc *sc = &apm_softc; 622 623 if (sc->active) { 624 625 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE; 626 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0; 627 (void) apm_bioscall(); 628 } 629 /* 630 * Some APM implementation halts CPU in BIOS, whenever 631 * "CPU-idle" function are invoked, but swtch() of 632 * FreeBSD halts CPU, therefore, CPU is halted twice 633 * in the sched loop. It makes the interrupt latency 634 * terribly long and be able to cause a serious problem 635 * in interrupt processing. We prevent it by removing 636 * "hlt" operation from swtch() and managed it under 637 * APM driver. 638 */ 639 if (!sc->active || sc->always_halt_cpu) 640 __asm("hlt"); /* wait for interrupt */ 641} 642 643/* inform APM BIOS that CPU is busy */ 644void 645apm_cpu_busy(void) 646{ 647 struct apm_softc *sc = &apm_softc; 648 649 /* 650 * The APM specification says this is only necessary if your BIOS 651 * slows down the processor in the idle task, otherwise it's not 652 * necessary. 653 */ 654 if (sc->slow_idle_cpu && sc->active) { 655 656 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY; 657 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0; 658 apm_bioscall(); 659 } 660} 661 662 663/* 664 * APM timeout routine: 665 * 666 * This routine is automatically called by timer once per second. 667 */ 668 669static void 670apm_timeout(void *dummy) 671{ 672 struct apm_softc *sc = &apm_softc; 673 674 if (apm_op_inprog) 675 apm_lastreq_notify(); 676 677 if (!sc->bios_busy) 678 apm_processevent(); 679 680 if (sc->active == 1) 681 /* Run slightly more oftan than 1 Hz */ 682 apm_timeout_ch = timeout(apm_timeout, NULL, hz - 1 ); 683} 684 685/* enable APM BIOS */ 686static void 687apm_event_enable(void) 688{ 689 struct apm_softc *sc = &apm_softc; 690 691#ifdef APM_DEBUG 692 printf("called apm_event_enable()\n"); 693#endif 694 if (sc->initialized) { 695 sc->active = 1; 696 apm_timeout(sc); 697 } 698} 699 700/* disable APM BIOS */ 701static void 702apm_event_disable(void) 703{ 704 struct apm_softc *sc = &apm_softc; 705 706#ifdef APM_DEBUG 707 printf("called apm_event_disable()\n"); 708#endif 709 if (sc->initialized) { 710 untimeout(apm_timeout, NULL, apm_timeout_ch); 711 sc->active = 0; 712 } 713} 714 715/* halt CPU in scheduling loop */ 716static void 717apm_halt_cpu(void) 718{ 719 struct apm_softc *sc = &apm_softc; 720 721 if (sc->initialized) 722 sc->always_halt_cpu = 1; 723} 724 725/* don't halt CPU in scheduling loop */ 726static void 727apm_not_halt_cpu(void) 728{ 729 struct apm_softc *sc = &apm_softc; 730 731 if (sc->initialized) 732 sc->always_halt_cpu = 0; 733} 734 735/* device driver definitions */ 736 737/* 738 * probe for APM BIOS 739 */ 740static int 741apm_probe(device_t dev) 742{ 743#define APM_KERNBASE KERNBASE 744 struct vm86frame vmf; 745 struct apm_softc *sc = &apm_softc; 746 int disabled, flags; 747 748 if (resource_int_value("apm", 0, "disabled", &disabled) == 0 749 && disabled != 0) 750 return ENXIO; 751 752 device_set_desc(dev, "APM BIOS"); 753 754 if ( device_get_unit(dev) > 0 ) { 755 printf("apm: Only one APM driver supported.\n"); 756 return ENXIO; 757 } 758 759 if (resource_int_value("apm", 0, "flags", &flags) != 0) 760 flags = 0; 761 762 bzero(&vmf, sizeof(struct vm86frame)); /* safety */ 763 bzero(&apm_softc, sizeof(apm_softc)); 764 vmf.vmf_ah = APM_BIOS; 765 vmf.vmf_al = APM_INSTCHECK; 766 vmf.vmf_bx = 0; 767 if (vm86_intcall(APM_INT, &vmf)) 768 return ENXIO; /* APM not found */ 769 if (vmf.vmf_bx != 0x504d) { 770 printf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx); 771 return ENXIO; 772 } 773 if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) { 774 printf("apm: protected mode connections are not supported\n"); 775 return ENXIO; 776 } 777 778 apm_version = vmf.vmf_ax; 779 sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0); 780 sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0); 781 sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0); 782 783 vmf.vmf_ah = APM_BIOS; 784 vmf.vmf_al = APM_DISCONNECT; 785 vmf.vmf_bx = 0; 786 vm86_intcall(APM_INT, &vmf); /* disconnect, just in case */ 787 788 if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) { 789 vmf.vmf_ah = APM_BIOS; 790 vmf.vmf_al = APM_PROT32CONNECT; 791 vmf.vmf_bx = 0; 792 if (vm86_intcall(APM_INT, &vmf)) { 793 printf("apm: 32-bit connection error.\n"); 794 return (ENXIO); 795 } 796 sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE; 797 sc->bios.seg.code32.limit = 0xffff; 798 sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE; 799 sc->bios.seg.code16.limit = 0xffff; 800 sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE; 801 sc->bios.seg.data.limit = 0xffff; 802 sc->bios.entry = vmf.vmf_ebx; 803 sc->connectmode = APM_PROT32CONNECT; 804 } else { 805 /* use 16-bit connection */ 806 vmf.vmf_ah = APM_BIOS; 807 vmf.vmf_al = APM_PROT16CONNECT; 808 vmf.vmf_bx = 0; 809 if (vm86_intcall(APM_INT, &vmf)) { 810 printf("apm: 16-bit connection error.\n"); 811 return (ENXIO); 812 } 813 sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE; 814 sc->bios.seg.code16.limit = 0xffff; 815 sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE; 816 sc->bios.seg.data.limit = 0xffff; 817 sc->bios.entry = vmf.vmf_bx; 818 sc->connectmode = APM_PROT16CONNECT; 819 } 820 return(0); 821} 822 823 824/* 825 * return 0 if the user will notice and handle the event, 826 * return 1 if the kernel driver should do so. 827 */ 828static int 829apm_record_event(struct apm_softc *sc, u_int event_type) 830{ 831 struct apm_event_info *evp; 832 833 if ((sc->sc_flags & SCFLAG_OPEN) == 0) 834 return 1; /* no user waiting */ 835 if (sc->event_count == APM_NEVENTS) 836 return 1; /* overflow */ 837 if (sc->event_filter[event_type] == 0) 838 return 1; /* not registered */ 839 evp = &sc->event_list[sc->event_ptr]; 840 sc->event_count++; 841 sc->event_ptr++; 842 sc->event_ptr %= APM_NEVENTS; 843 evp->type = event_type; 844 evp->index = ++apm_evindex; 845 selwakeup(&sc->sc_rsel); 846 return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */ 847} 848 849/* Process APM event */ 850static void 851apm_processevent(void) 852{ 853 int apm_event; 854 struct apm_softc *sc = &apm_softc; 855 856#ifdef APM_DEBUG 857# define OPMEV_DEBUGMESSAGE(symbol) case symbol: \ 858 printf("Received APM Event: " #symbol "\n"); 859#else 860# define OPMEV_DEBUGMESSAGE(symbol) case symbol: 861#endif 862 do { 863 apm_event = apm_getevent(); 864 switch (apm_event) { 865 OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ); 866 if (apm_op_inprog == 0) { 867 apm_op_inprog++; 868 if (apm_record_event(sc, apm_event)) { 869 apm_suspend(PMST_STANDBY); 870 } 871 } 872 break; 873 OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ); 874 apm_lastreq_notify(); 875 if (apm_op_inprog == 0) { 876 apm_op_inprog++; 877 if (apm_record_event(sc, apm_event)) { 878 apm_suspend(PMST_SUSPEND); 879 } 880 } 881 return; /* XXX skip the rest */ 882 OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ); 883 apm_lastreq_notify(); 884 if (apm_op_inprog == 0) { 885 apm_op_inprog++; 886 if (apm_record_event(sc, apm_event)) { 887 apm_suspend(PMST_SUSPEND); 888 } 889 } 890 return; /* XXX skip the rest */ 891 OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND); 892 apm_suspend(PMST_SUSPEND); 893 break; 894 OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME); 895 apm_record_event(sc, apm_event); 896 apm_resume(); 897 break; 898 OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME); 899 apm_record_event(sc, apm_event); 900 apm_resume(); 901 break; 902 OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME); 903 apm_record_event(sc, apm_event); 904 apm_resume(); 905 break; 906 OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW); 907 if (apm_record_event(sc, apm_event)) { 908 apm_battery_low(); 909 apm_suspend(PMST_SUSPEND); 910 } 911 break; 912 OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE); 913 apm_record_event(sc, apm_event); 914 break; 915 OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME); 916 apm_record_event(sc, apm_event); 917 inittodr(0); /* adjust time to RTC */ 918 break; 919 case PMEV_NOEVENT: 920 break; 921 default: 922 printf("Unknown Original APM Event 0x%x\n", apm_event); 923 break; 924 } 925 } while (apm_event != PMEV_NOEVENT); 926} 927 928/* 929 * Attach APM: 930 * 931 * Initialize APM driver 932 */ 933 934static int 935apm_attach(device_t dev) 936{ 937 struct apm_softc *sc = &apm_softc; 938 int flags; 939 int drv_version; 940 941 if (resource_int_value("apm", 0, "flags", &flags) != 0) 942 flags = 0; 943 944 if (flags & 0x20) 945 statclock_disable = 1; 946 947 sc->initialized = 0; 948 949 /* Must be externally enabled */ 950 sc->active = 0; 951 952 /* Always call HLT in idle loop */ 953 sc->always_halt_cpu = 1; 954 955 /* print bootstrap messages */ 956#ifdef APM_DEBUG 957 printf("apm: APM BIOS version %04x\n", apm_version); 958 printf("apm: Code16 0x%08x, Data 0x%08x\n", 959 sc->bios.seg.code16.base, sc->bios.seg.data.base); 960 printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n", 961 sc->bios.entry, is_enabled(sc->slow_idle_cpu), 962 is_enabled(!sc->disabled)); 963 printf("apm: CS_limit=0x%x, DS_limit=0x%x\n", 964 sc->bios.seg.code16.limit, sc->bios.seg.data.limit); 965#endif /* APM_DEBUG */ 966 967#if 0 968 /* 969 * XXX this may not be needed anymore 970 */ 971 if ((flags & 0x10)) { 972 if ((flags & 0xf) >= 0x2) { 973 apm_driver_version(0x102); 974 } 975 if (!apm_version && (flags & 0xf) >= 0x1) { 976 apm_driver_version(0x101); 977 } 978 } else { 979 apm_driver_version(0x102); 980 if (!apm_version) 981 apm_driver_version(0x101); 982 } 983#endif 984 /* 985 * In one test, apm bios version was 1.02; an attempt to register 986 * a 1.04 driver resulted in a 1.00 connection! Registering a 987 * 1.02 driver resulted in a 1.02 connection. 988 */ 989 drv_version = apm_version > 0x102 ? 0x102 : apm_version; 990 for (; drv_version > 0x100; drv_version--) 991 if (apm_driver_version(drv_version) == 0) 992 break; 993 sc->minorversion = ((drv_version & 0x00f0) >> 4) * 10 + 994 ((drv_version & 0x000f) >> 0); 995 sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 + 996 ((apm_version & 0x0f00) >> 8); 997 998 sc->intversion = INTVERSION(sc->majorversion, sc->minorversion); 999 1000#ifdef APM_DEBUG 1001 if (sc->intversion >= INTVERSION(1, 1)) 1002 printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged)); 1003#endif 1004 1005 printf("apm: found APM BIOS v%ld.%ld, connected at v%d.%d\n", 1006 ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8), 1007 ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0), 1008 sc->majorversion, sc->minorversion); 1009 1010#ifdef APM_DEBUG 1011 printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu)); 1012#endif 1013 1014 /* enable power management */ 1015 if (sc->disabled) { 1016 if (apm_enable_disable_pm(1)) { 1017#ifdef APM_DEBUG 1018 printf("apm: *Warning* enable function failed! [%x]\n", 1019 (sc->bios.r.eax >> 8) & 0xff); 1020#endif 1021 } 1022 } 1023 1024 /* engage power managment (APM 1.1 or later) */ 1025 if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) { 1026 if (apm_engage_disengage_pm(1)) { 1027#ifdef APM_DEBUG 1028 printf("apm: *Warning* engage function failed err=[%x]", 1029 (sc->bios.r.eax >> 8) & 0xff); 1030 printf(" (Docked or using external power?).\n"); 1031#endif 1032 } 1033 } 1034 1035 /* default suspend hook */ 1036 sc->sc_suspend.ah_fun = apm_default_suspend; 1037 sc->sc_suspend.ah_arg = sc; 1038 sc->sc_suspend.ah_name = "default suspend"; 1039 sc->sc_suspend.ah_order = APM_MAX_ORDER; 1040 1041 /* default resume hook */ 1042 sc->sc_resume.ah_fun = apm_default_resume; 1043 sc->sc_resume.ah_arg = sc; 1044 sc->sc_resume.ah_name = "default resume"; 1045 sc->sc_resume.ah_order = APM_MIN_ORDER; 1046 1047 apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend); 1048 apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume); 1049 1050 /* Power the system off using APM */ 1051 EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL, 1052 SHUTDOWN_PRI_LAST); 1053 1054 sc->initialized = 1; 1055 1056#ifdef DEVFS 1057 sc->sc_devfs_token = 1058 devfs_add_devswf(&apm_cdevsw, 0, DV_CHR, 0, 0, 0600, "apm"); 1059#endif 1060 return 0; 1061} 1062 1063static int 1064apmopen(dev_t dev, int flag, int fmt, struct proc *p) 1065{ 1066 struct apm_softc *sc = &apm_softc; 1067 int ctl = APMDEV(dev); 1068 1069 if (!sc->initialized) 1070 return (ENXIO); 1071 1072 switch (ctl) { 1073 case APMDEV_CTL: 1074 if (!(flag & FWRITE)) 1075 return EINVAL; 1076 if (sc->sc_flags & SCFLAG_OCTL) 1077 return EBUSY; 1078 sc->sc_flags |= SCFLAG_OCTL; 1079 bzero(sc->event_filter, sizeof sc->event_filter); 1080 break; 1081 case APMDEV_NORMAL: 1082 sc->sc_flags |= SCFLAG_ONORMAL; 1083 break; 1084 default: 1085 return ENXIO; 1086 break; 1087 } 1088 return 0; 1089} 1090 1091static int 1092apmclose(dev_t dev, int flag, int fmt, struct proc *p) 1093{ 1094 struct apm_softc *sc = &apm_softc; 1095 int ctl = APMDEV(dev); 1096 1097 switch (ctl) { 1098 case APMDEV_CTL: 1099 apm_lastreq_rejected(); 1100 sc->sc_flags &= ~SCFLAG_OCTL; 1101 bzero(sc->event_filter, sizeof sc->event_filter); 1102 break; 1103 case APMDEV_NORMAL: 1104 sc->sc_flags &= ~SCFLAG_ONORMAL; 1105 break; 1106 } 1107 if ((sc->sc_flags & SCFLAG_OPEN) == 0) { 1108 sc->event_count = 0; 1109 sc->event_ptr = 0; 1110 } 1111 return 0; 1112} 1113 1114static int 1115apmioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 1116{ 1117 struct apm_softc *sc = &apm_softc; 1118 struct apm_bios_arg *args; 1119 int error = 0; 1120 int ret; 1121 int newstate; 1122 1123 if (!sc->initialized) 1124 return (ENXIO); 1125#ifdef APM_DEBUG 1126 printf("APM ioctl: cmd = 0x%x\n", cmd); 1127#endif 1128 switch (cmd) { 1129 case APMIO_SUSPEND: 1130 if (sc->active) 1131 apm_suspend(PMST_SUSPEND); 1132 else 1133 error = EINVAL; 1134 break; 1135 1136 case APMIO_STANDBY: 1137 if (sc->active) 1138 apm_suspend(PMST_STANDBY); 1139 else 1140 error = EINVAL; 1141 break; 1142 1143 case APMIO_GETINFO_OLD: 1144 { 1145 struct apm_info info; 1146 apm_info_old_t aiop; 1147 1148 if (apm_get_info(&info)) 1149 error = ENXIO; 1150 aiop = (apm_info_old_t)addr; 1151 aiop->ai_major = info.ai_major; 1152 aiop->ai_minor = info.ai_minor; 1153 aiop->ai_acline = info.ai_acline; 1154 aiop->ai_batt_stat = info.ai_batt_stat; 1155 aiop->ai_batt_life = info.ai_batt_life; 1156 aiop->ai_status = info.ai_status; 1157 } 1158 break; 1159 case APMIO_GETINFO: 1160 if (apm_get_info((apm_info_t)addr)) 1161 error = ENXIO; 1162 break; 1163 case APMIO_ENABLE: 1164 apm_event_enable(); 1165 break; 1166 case APMIO_DISABLE: 1167 apm_event_disable(); 1168 break; 1169 case APMIO_HALTCPU: 1170 apm_halt_cpu(); 1171 break; 1172 case APMIO_NOTHALTCPU: 1173 apm_not_halt_cpu(); 1174 break; 1175 case APMIO_DISPLAY: 1176 newstate = *(int *)addr; 1177 if (apm_display(newstate)) 1178 error = ENXIO; 1179 break; 1180 case APMIO_BIOS: 1181 /* XXX compatibility with the old interface */ 1182 args = (struct apm_bios_arg *)addr; 1183 sc->bios.r.eax = args->eax; 1184 sc->bios.r.ebx = args->ebx; 1185 sc->bios.r.ecx = args->ecx; 1186 sc->bios.r.edx = args->edx; 1187 sc->bios.r.esi = args->esi; 1188 sc->bios.r.edi = args->edi; 1189 if ((ret = apm_bioscall())) { 1190 /* 1191 * Return code 1 means bios call was unsuccessful. 1192 * Error code is stored in %ah. 1193 * Return code -1 means bios call was unsupported 1194 * in the APM BIOS version. 1195 */ 1196 if (ret == -1) { 1197 error = EINVAL; 1198 } 1199 } else { 1200 /* 1201 * Return code 0 means bios call was successful. 1202 * We need only %al and can discard %ah. 1203 */ 1204 sc->bios.r.eax &= 0xff; 1205 } 1206 args->eax = sc->bios.r.eax; 1207 args->ebx = sc->bios.r.ebx; 1208 args->ecx = sc->bios.r.ecx; 1209 args->edx = sc->bios.r.edx; 1210 args->esi = sc->bios.r.esi; 1211 args->edi = sc->bios.r.edi; 1212 break; 1213 default: 1214 error = EINVAL; 1215 break; 1216 } 1217 1218 /* for /dev/apmctl */ 1219 if (APMDEV(dev) == APMDEV_CTL) { 1220 struct apm_event_info *evp; 1221 int i; 1222 1223 error = 0; 1224 switch (cmd) { 1225 case APMIO_NEXTEVENT: 1226 if (!sc->event_count) { 1227 error = EAGAIN; 1228 } else { 1229 evp = (struct apm_event_info *)addr; 1230 i = sc->event_ptr + APM_NEVENTS - sc->event_count; 1231 i %= APM_NEVENTS; 1232 *evp = sc->event_list[i]; 1233 sc->event_count--; 1234 } 1235 break; 1236 case APMIO_REJECTLASTREQ: 1237 if (apm_lastreq_rejected()) { 1238 error = EINVAL; 1239 } 1240 break; 1241 default: 1242 error = EINVAL; 1243 break; 1244 } 1245 } 1246 1247 return error; 1248} 1249 1250static int 1251apmwrite(dev_t dev, struct uio *uio, int ioflag) 1252{ 1253 struct apm_softc *sc = &apm_softc; 1254 u_int event_type; 1255 int error; 1256 u_char enabled; 1257 1258 if (APMDEV(dev) != APMDEV_CTL) 1259 return(ENODEV); 1260 if (uio->uio_resid != sizeof(u_int)) 1261 return(E2BIG); 1262 1263 if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio))) 1264 return(error); 1265 1266 if (event_type < 0 || event_type >= APM_NPMEV) 1267 return(EINVAL); 1268 1269 if (sc->event_filter[event_type] == 0) { 1270 enabled = 1; 1271 } else { 1272 enabled = 0; 1273 } 1274 sc->event_filter[event_type] = enabled; 1275#ifdef APM_DEBUG 1276 printf("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled)); 1277#endif 1278 1279 return uio->uio_resid; 1280} 1281 1282static int 1283apmpoll(dev_t dev, int events, struct proc *p) 1284{ 1285 struct apm_softc *sc = &apm_softc; 1286 int revents = 0; 1287 1288 if (events & (POLLIN | POLLRDNORM)) { 1289 if (sc->event_count) { 1290 revents |= events & (POLLIN | POLLRDNORM); 1291 } else { 1292 selrecord(p, &sc->sc_rsel); 1293 } 1294 } 1295 1296 return (revents); 1297} 1298 1299static device_method_t apm_methods[] = { 1300 /* Device interface */ 1301 DEVMETHOD(device_probe, apm_probe), 1302 DEVMETHOD(device_attach, apm_attach), 1303 1304 { 0, 0 } 1305}; 1306 1307static driver_t apm_driver = { 1308 "apm", 1309 apm_methods, 1310 1, /* no softc (XXX) */ 1311}; 1312 1313static devclass_t apm_devclass; 1314 1315DEV_DRIVER_MODULE(apm, nexus, apm_driver, apm_devclass, apm_cdevsw, 0, 0); 1316