apm.c revision 63493
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 * $FreeBSD: head/sys/i386/bios/apm.c 63493 2000-07-19 06:32:00Z imp $ 19 */ 20 21#include <sys/param.h> 22#include <sys/systm.h> 23#include <sys/eventhandler.h> 24#include <sys/conf.h> 25#include <sys/kernel.h> 26#include <sys/time.h> 27#include <sys/reboot.h> 28#include <sys/bus.h> 29#include <sys/select.h> 30#include <sys/poll.h> 31#include <sys/fcntl.h> 32#include <sys/proc.h> 33#include <sys/uio.h> 34#include <sys/signalvar.h> 35#include <sys/sysctl.h> 36#include <machine/apm_bios.h> 37#include <machine/segments.h> 38#include <machine/clock.h> 39#include <vm/vm.h> 40#include <vm/vm_param.h> 41#include <vm/pmap.h> 42#include <sys/syslog.h> 43 44#include <machine/pc/bios.h> 45#include <machine/vm86.h> 46 47#include <i386/apm/apm.h> 48 49/* Used by the apm_saver screen saver module */ 50int apm_display __P((int newstate)); 51struct apm_softc apm_softc; 52 53static void apm_resume __P((void)); 54static int apm_bioscall(void); 55static int apm_check_function_supported __P((u_int version, u_int func)); 56 57static u_long apm_version; 58 59int apm_evindex; 60 61#define SCFLAG_ONORMAL 0x0000001 62#define SCFLAG_OCTL 0x0000002 63#define SCFLAG_OPEN (SCFLAG_ONORMAL|SCFLAG_OCTL) 64 65#define APMDEV(dev) (minor(dev)&0x0f) 66#define APMDEV_NORMAL 0 67#define APMDEV_CTL 8 68 69static struct apmhook *hook[NAPM_HOOK]; /* XXX */ 70 71#define is_enabled(foo) ((foo) ? "enabled" : "disabled") 72 73/* Map version number to integer (keeps ordering of version numbers) */ 74#define INTVERSION(major, minor) ((major)*100 + (minor)) 75 76static struct callout_handle apm_timeout_ch = 77 CALLOUT_HANDLE_INITIALIZER(&apm_timeout_ch); 78 79static timeout_t apm_timeout; 80static d_open_t apmopen; 81static d_close_t apmclose; 82static d_write_t apmwrite; 83static d_ioctl_t apmioctl; 84static d_poll_t apmpoll; 85 86#define CDEV_MAJOR 39 87static struct cdevsw apm_cdevsw = { 88 /* open */ apmopen, 89 /* close */ apmclose, 90 /* read */ noread, 91 /* write */ apmwrite, 92 /* ioctl */ apmioctl, 93 /* poll */ apmpoll, 94 /* mmap */ nommap, 95 /* strategy */ nostrategy, 96 /* name */ "apm", 97 /* maj */ CDEV_MAJOR, 98 /* dump */ nodump, 99 /* psize */ nopsize, 100 /* flags */ 0, 101 /* bmaj */ -1 102}; 103 104static int apm_suspend_delay = 1; 105static int apm_standby_delay = 1; 106 107SYSCTL_INT(_machdep, OID_AUTO, apm_suspend_delay, CTLFLAG_RW, &apm_suspend_delay, 1, ""); 108SYSCTL_INT(_machdep, OID_AUTO, apm_standby_delay, CTLFLAG_RW, &apm_standby_delay, 1, ""); 109 110/* 111 * return 0 if the function successfull, 112 * return 1 if the function unsuccessfull, 113 * return -1 if the function unsupported. 114 */ 115static int 116apm_bioscall(void) 117{ 118 struct apm_softc *sc = &apm_softc; 119 int errno = 0; 120 u_int apm_func = sc->bios.r.eax & 0xff; 121 122 if (!apm_check_function_supported(sc->intversion, apm_func)) { 123#ifdef APM_DEBUG 124 printf("apm_bioscall: function 0x%x is not supported in v%d.%d\n", 125 apm_func, sc->majorversion, sc->minorversion); 126#endif 127 return (-1); 128 } 129 130 sc->bios_busy = 1; 131 if (sc->connectmode == APM_PROT32CONNECT) { 132 set_bios_selectors(&sc->bios.seg, 133 BIOSCODE_FLAG | BIOSDATA_FLAG); 134 errno = bios32(&sc->bios.r, 135 sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL)); 136 } else { 137 errno = bios16(&sc->bios, NULL); 138 } 139 sc->bios_busy = 0; 140 return (errno); 141} 142 143/* check whether APM function is supported (1) or not (0). */ 144static int 145apm_check_function_supported(u_int version, u_int func) 146{ 147 /* except driver version */ 148 if (func == APM_DRVVERSION) { 149 return (1); 150 } 151 152 switch (version) { 153 case INTVERSION(1, 0): 154 if (func > APM_GETPMEVENT) { 155 return (0); /* not supported */ 156 } 157 break; 158 case INTVERSION(1, 1): 159 if (func > APM_ENGAGEDISENGAGEPM && 160 func < APM_OEMFUNC) { 161 return (0); /* not supported */ 162 } 163 break; 164 case INTVERSION(1, 2): 165 break; 166 } 167 168 return (1); /* supported */ 169} 170 171/* enable/disable power management */ 172static int 173apm_enable_disable_pm(int enable) 174{ 175 struct apm_softc *sc = &apm_softc; 176 177 sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM; 178 179 if (sc->intversion >= INTVERSION(1, 1)) 180 sc->bios.r.ebx = PMDV_ALLDEV; 181 else 182 sc->bios.r.ebx = 0xffff; /* APM version 1.0 only */ 183 sc->bios.r.ecx = enable; 184 sc->bios.r.edx = 0; 185 return (apm_bioscall()); 186} 187 188/* register driver version (APM 1.1 or later) */ 189static int 190apm_driver_version(int version) 191{ 192 struct apm_softc *sc = &apm_softc; 193 194 sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION; 195 sc->bios.r.ebx = 0x0; 196 sc->bios.r.ecx = version; 197 sc->bios.r.edx = 0; 198 199 if (apm_bioscall() == 0 && sc->bios.r.eax == version) 200 return (0); 201 202 /* Some old BIOSes don't return the connection version in %ax. */ 203 if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION)) 204 return (0); 205 206 return (1); 207} 208 209/* engage/disengage power management (APM 1.1 or later) */ 210static int 211apm_engage_disengage_pm(int engage) 212{ 213 struct apm_softc *sc = &apm_softc; 214 215 sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM; 216 sc->bios.r.ebx = PMDV_ALLDEV; 217 sc->bios.r.ecx = engage; 218 sc->bios.r.edx = 0; 219 return (apm_bioscall()); 220} 221 222/* get PM event */ 223static u_int 224apm_getevent(void) 225{ 226 struct apm_softc *sc = &apm_softc; 227 228 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT; 229 230 sc->bios.r.ebx = 0; 231 sc->bios.r.ecx = 0; 232 sc->bios.r.edx = 0; 233 if (apm_bioscall()) 234 return (PMEV_NOEVENT); 235 return (sc->bios.r.ebx & 0xffff); 236} 237 238/* suspend entire system */ 239static int 240apm_suspend_system(int state) 241{ 242 struct apm_softc *sc = &apm_softc; 243 244 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 245 sc->bios.r.ebx = PMDV_ALLDEV; 246 sc->bios.r.ecx = state; 247 sc->bios.r.edx = 0; 248 249 if (apm_bioscall()) { 250 printf("Entire system suspend failure: errcode = %d\n", 251 0xff & (sc->bios.r.eax >> 8)); 252 return 1; 253 } 254 return 0; 255} 256 257/* Display control */ 258/* 259 * Experimental implementation: My laptop machine can't handle this function 260 * If your laptop can control the display via APM, please inform me. 261 * HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org> 262 */ 263int 264apm_display(int newstate) 265{ 266 struct apm_softc *sc = &apm_softc; 267 268 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 269 sc->bios.r.ebx = PMDV_DISP0; 270 sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND; 271 sc->bios.r.edx = 0; 272 if (apm_bioscall()) { 273 printf("Display off failure: errcode = %d\n", 274 0xff & (sc->bios.r.eax >> 8)); 275 return 1; 276 } 277 return 0; 278} 279 280/* 281 * Turn off the entire system. 282 */ 283static void 284apm_power_off(void *junk, int howto) 285{ 286 struct apm_softc *sc = &apm_softc; 287 288 /* Not halting powering off, or not active */ 289 if (!(howto & RB_POWEROFF) || !apm_softc.active) 290 return; 291 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 292 sc->bios.r.ebx = PMDV_ALLDEV; 293 sc->bios.r.ecx = PMST_OFF; 294 sc->bios.r.edx = 0; 295 (void) apm_bioscall(); 296} 297 298/* APM Battery low handler */ 299static void 300apm_battery_low(void) 301{ 302 printf("\007\007 * * * BATTERY IS LOW * * * \007\007"); 303} 304 305/* APM hook manager */ 306static struct apmhook * 307apm_add_hook(struct apmhook **list, struct apmhook *ah) 308{ 309 int s; 310 struct apmhook *p, *prev; 311 312#ifdef APM_DEBUG 313 printf("Add hook \"%s\"\n", ah->ah_name); 314#endif 315 316 s = splhigh(); 317 if (ah == NULL) 318 panic("illegal apm_hook!"); 319 prev = NULL; 320 for (p = *list; p != NULL; prev = p, p = p->ah_next) 321 if (p->ah_order > ah->ah_order) 322 break; 323 324 if (prev == NULL) { 325 ah->ah_next = *list; 326 *list = ah; 327 } else { 328 ah->ah_next = prev->ah_next; 329 prev->ah_next = ah; 330 } 331 splx(s); 332 return ah; 333} 334 335static void 336apm_del_hook(struct apmhook **list, struct apmhook *ah) 337{ 338 int s; 339 struct apmhook *p, *prev; 340 341 s = splhigh(); 342 prev = NULL; 343 for (p = *list; p != NULL; prev = p, p = p->ah_next) 344 if (p == ah) 345 goto deleteit; 346 panic("Tried to delete unregistered apm_hook."); 347 goto nosuchnode; 348deleteit: 349 if (prev != NULL) 350 prev->ah_next = p->ah_next; 351 else 352 *list = p->ah_next; 353nosuchnode: 354 splx(s); 355} 356 357 358/* APM driver calls some functions automatically */ 359static void 360apm_execute_hook(struct apmhook *list) 361{ 362 struct apmhook *p; 363 364 for (p = list; p != NULL; p = p->ah_next) { 365#ifdef APM_DEBUG 366 printf("Execute APM hook \"%s.\"\n", p->ah_name); 367#endif 368 if ((*(p->ah_fun))(p->ah_arg)) 369 printf("Warning: APM hook \"%s\" failed", p->ah_name); 370 } 371} 372 373 374/* establish an apm hook */ 375struct apmhook * 376apm_hook_establish(int apmh, struct apmhook *ah) 377{ 378 if (apmh < 0 || apmh >= NAPM_HOOK) 379 return NULL; 380 381 return apm_add_hook(&hook[apmh], ah); 382} 383 384/* disestablish an apm hook */ 385void 386apm_hook_disestablish(int apmh, struct apmhook *ah) 387{ 388 if (apmh < 0 || apmh >= NAPM_HOOK) 389 return; 390 391 apm_del_hook(&hook[apmh], ah); 392} 393 394 395static struct timeval suspend_time; 396static struct timeval diff_time; 397 398static int 399apm_default_resume(void *arg) 400{ 401 int pl; 402 u_int second, minute, hour; 403 struct timeval resume_time, tmp_time; 404 405 /* modified for adjkerntz */ 406 pl = splsoftclock(); 407 i8254_restore(); /* restore timer_freq and hz */ 408 inittodr(0); /* adjust time to RTC */ 409 microtime(&resume_time); 410 getmicrotime(&tmp_time); 411 timevaladd(&tmp_time, &diff_time); 412 413#ifdef FIXME 414 /* XXX THIS DOESN'T WORK!!! */ 415 time = tmp_time; 416#endif 417 418#ifdef APM_FIXUP_CALLTODO 419 /* Calculate the delta time suspended */ 420 timevalsub(&resume_time, &suspend_time); 421 /* Fixup the calltodo list with the delta time. */ 422 adjust_timeout_calltodo(&resume_time); 423#endif /* APM_FIXUP_CALLTODOK */ 424 splx(pl); 425#ifndef APM_FIXUP_CALLTODO 426 second = resume_time.tv_sec - suspend_time.tv_sec; 427#else /* APM_FIXUP_CALLTODO */ 428 /* 429 * We've already calculated resume_time to be the delta between 430 * the suspend and the resume. 431 */ 432 second = resume_time.tv_sec; 433#endif /* APM_FIXUP_CALLTODO */ 434 hour = second / 3600; 435 second %= 3600; 436 minute = second / 60; 437 second %= 60; 438 log(LOG_NOTICE, "resumed from suspended mode (slept %02d:%02d:%02d)\n", 439 hour, minute, second); 440 return 0; 441} 442 443static int 444apm_default_suspend(void *arg) 445{ 446 int pl; 447 448 pl = splsoftclock(); 449 microtime(&diff_time); 450 inittodr(0); 451 microtime(&suspend_time); 452 timevalsub(&diff_time, &suspend_time); 453 splx(pl); 454 return 0; 455} 456 457static int apm_record_event __P((struct apm_softc *, u_int)); 458static void apm_processevent(void); 459 460static u_int apm_op_inprog = 0; 461 462static void 463apm_do_suspend(void) 464{ 465 struct apm_softc *sc = &apm_softc; 466 int error; 467 468 if (!sc) 469 return; 470 471 apm_op_inprog = 0; 472 sc->suspends = sc->suspend_countdown = 0; 473 474 if (sc->initialized) { 475 error = DEVICE_SUSPEND(root_bus); 476 if (error) { 477 DEVICE_RESUME(root_bus); 478 } else { 479 apm_execute_hook(hook[APM_HOOK_SUSPEND]); 480 if (apm_suspend_system(PMST_SUSPEND) == 0) { 481 apm_processevent(); 482 } else { 483 /* Failure, 'resume' the system again */ 484 apm_execute_hook(hook[APM_HOOK_RESUME]); 485 DEVICE_RESUME(root_bus); 486 } 487 } 488 } 489} 490 491static void 492apm_do_standby(void) 493{ 494 struct apm_softc *sc = &apm_softc; 495 496 if (!sc) 497 return; 498 499 apm_op_inprog = 0; 500 sc->standbys = sc->standby_countdown = 0; 501 502 if (sc->initialized) { 503 /* 504 * As far as standby, we don't need to execute 505 * all of suspend hooks. 506 */ 507 apm_default_suspend(&apm_softc); 508 if (apm_suspend_system(PMST_STANDBY) == 0) 509 apm_processevent(); 510 } 511} 512 513static void 514apm_lastreq_notify(void) 515{ 516 struct apm_softc *sc = &apm_softc; 517 518 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 519 sc->bios.r.ebx = PMDV_ALLDEV; 520 sc->bios.r.ecx = PMST_LASTREQNOTIFY; 521 sc->bios.r.edx = 0; 522 apm_bioscall(); 523} 524 525static int 526apm_lastreq_rejected(void) 527{ 528 struct apm_softc *sc = &apm_softc; 529 530 if (apm_op_inprog == 0) { 531 return 1; /* no operation in progress */ 532 } 533 534 sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE; 535 sc->bios.r.ebx = PMDV_ALLDEV; 536 sc->bios.r.ecx = PMST_LASTREQREJECT; 537 sc->bios.r.edx = 0; 538 539 if (apm_bioscall()) { 540#ifdef APM_DEBUG 541 printf("apm_lastreq_rejected: failed\n"); 542#endif 543 return 1; 544 } 545 apm_op_inprog = 0; 546 return 0; 547} 548 549/* 550 * Public interface to the suspend/resume: 551 * 552 * Execute suspend and resume hook before and after sleep, respectively. 553 * 554 */ 555 556void 557apm_suspend(int state) 558{ 559 struct apm_softc *sc = &apm_softc; 560 561 if (!sc->initialized) 562 return; 563 564 switch (state) { 565 case PMST_SUSPEND: 566 if (sc->suspends) 567 return; 568 sc->suspends++; 569 sc->suspend_countdown = apm_suspend_delay; 570 break; 571 case PMST_STANDBY: 572 if (sc->standbys) 573 return; 574 sc->standbys++; 575 sc->standby_countdown = apm_standby_delay; 576 break; 577 default: 578 printf("apm_suspend: Unknown Suspend state 0x%x\n", state); 579 return; 580 } 581 582 apm_op_inprog++; 583 apm_lastreq_notify(); 584} 585 586void 587apm_resume(void) 588{ 589 struct apm_softc *sc = &apm_softc; 590 591 if (!sc) 592 return; 593 594 if (sc->initialized) { 595 apm_execute_hook(hook[APM_HOOK_RESUME]); 596 DEVICE_RESUME(root_bus); 597 } 598} 599 600 601/* get APM information */ 602static int 603apm_get_info(apm_info_t aip) 604{ 605 struct apm_softc *sc = &apm_softc; 606 607 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS; 608 sc->bios.r.ebx = PMDV_ALLDEV; 609 sc->bios.r.ecx = 0; 610 sc->bios.r.edx = 0xffff; /* default to unknown battery time */ 611 612 if (apm_bioscall()) 613 return 1; 614 615 aip->ai_infoversion = 1; 616 aip->ai_acline = (sc->bios.r.ebx >> 8) & 0xff; 617 aip->ai_batt_stat = sc->bios.r.ebx & 0xff; 618 aip->ai_batt_life = sc->bios.r.ecx & 0xff; 619 aip->ai_major = (u_int)sc->majorversion; 620 aip->ai_minor = (u_int)sc->minorversion; 621 aip->ai_status = (u_int)sc->active; 622 sc->bios.r.edx &= 0xffff; 623 if (sc->bios.r.edx == 0xffff) /* Time is unknown */ 624 aip->ai_batt_time = -1; 625 else if (sc->bios.r.edx & 0x8000) /* Time is in minutes */ 626 aip->ai_batt_time = (sc->bios.r.edx & 0x7fff) * 60; 627 else /* Time is in seconds */ 628 aip->ai_batt_time = sc->bios.r.edx; 629 630 sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES; 631 sc->bios.r.ebx = 0; 632 sc->bios.r.ecx = 0; 633 sc->bios.r.edx = 0; 634 if (apm_bioscall()) { 635 aip->ai_batteries = -1; /* Unknown */ 636 aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */ 637 } else { 638 aip->ai_batteries = sc->bios.r.ebx & 0xff; 639 aip->ai_capabilities = sc->bios.r.ecx & 0xf; 640 } 641 642 bzero(aip->ai_spare, sizeof aip->ai_spare); 643 644 return 0; 645} 646 647 648/* inform APM BIOS that CPU is idle */ 649void 650apm_cpu_idle(void) 651{ 652 struct apm_softc *sc = &apm_softc; 653 654 if (sc->active) { 655 656 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE; 657 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0; 658 (void) apm_bioscall(); 659 } 660 /* 661 * Some APM implementation halts CPU in BIOS, whenever 662 * "CPU-idle" function are invoked, but swtch() of 663 * FreeBSD halts CPU, therefore, CPU is halted twice 664 * in the sched loop. It makes the interrupt latency 665 * terribly long and be able to cause a serious problem 666 * in interrupt processing. We prevent it by removing 667 * "hlt" operation from swtch() and managed it under 668 * APM driver. 669 */ 670 if (!sc->active || sc->always_halt_cpu) 671 __asm("hlt"); /* wait for interrupt */ 672} 673 674/* inform APM BIOS that CPU is busy */ 675void 676apm_cpu_busy(void) 677{ 678 struct apm_softc *sc = &apm_softc; 679 680 /* 681 * The APM specification says this is only necessary if your BIOS 682 * slows down the processor in the idle task, otherwise it's not 683 * necessary. 684 */ 685 if (sc->slow_idle_cpu && sc->active) { 686 687 sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY; 688 sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0; 689 apm_bioscall(); 690 } 691} 692 693 694/* 695 * APM timeout routine: 696 * 697 * This routine is automatically called by timer once per second. 698 */ 699 700static void 701apm_timeout(void *dummy) 702{ 703 struct apm_softc *sc = &apm_softc; 704 705 if (apm_op_inprog) 706 apm_lastreq_notify(); 707 708 if (sc->standbys && sc->standby_countdown-- <= 0) 709 apm_do_standby(); 710 711 if (sc->suspends && sc->suspend_countdown-- <= 0) 712 apm_do_suspend(); 713 714 if (!sc->bios_busy) 715 apm_processevent(); 716 717 if (sc->active == 1) 718 /* Run slightly more oftan than 1 Hz */ 719 apm_timeout_ch = timeout(apm_timeout, NULL, hz - 1 ); 720} 721 722/* enable APM BIOS */ 723static void 724apm_event_enable(void) 725{ 726 struct apm_softc *sc = &apm_softc; 727 728#ifdef APM_DEBUG 729 printf("called apm_event_enable()\n"); 730#endif 731 if (sc->initialized) { 732 sc->active = 1; 733 apm_timeout(sc); 734 } 735} 736 737/* disable APM BIOS */ 738static void 739apm_event_disable(void) 740{ 741 struct apm_softc *sc = &apm_softc; 742 743#ifdef APM_DEBUG 744 printf("called apm_event_disable()\n"); 745#endif 746 if (sc->initialized) { 747 untimeout(apm_timeout, NULL, apm_timeout_ch); 748 sc->active = 0; 749 } 750} 751 752/* halt CPU in scheduling loop */ 753static void 754apm_halt_cpu(void) 755{ 756 struct apm_softc *sc = &apm_softc; 757 758 if (sc->initialized) 759 sc->always_halt_cpu = 1; 760} 761 762/* don't halt CPU in scheduling loop */ 763static void 764apm_not_halt_cpu(void) 765{ 766 struct apm_softc *sc = &apm_softc; 767 768 if (sc->initialized) 769 sc->always_halt_cpu = 0; 770} 771 772/* device driver definitions */ 773 774/* 775 * Create "connection point" 776 */ 777static void 778apm_identify(driver_t *driver, device_t parent) 779{ 780 device_t child; 781 782 child = BUS_ADD_CHILD(parent, 0, "apm", 0); 783 if (child == NULL) 784 panic("apm_identify"); 785} 786 787/* 788 * probe for APM BIOS 789 */ 790static int 791apm_probe(device_t dev) 792{ 793#define APM_KERNBASE KERNBASE 794 struct vm86frame vmf; 795 struct apm_softc *sc = &apm_softc; 796 int disabled, flags; 797 798 if (resource_int_value("apm", 0, "disabled", &disabled) == 0 799 && disabled != 0) 800 return ENXIO; 801 802 device_set_desc(dev, "APM BIOS"); 803 804 if ( device_get_unit(dev) > 0 ) { 805 printf("apm: Only one APM driver supported.\n"); 806 return ENXIO; 807 } 808 809 if (resource_int_value("apm", 0, "flags", &flags) != 0) 810 flags = 0; 811 812 bzero(&vmf, sizeof(struct vm86frame)); /* safety */ 813 bzero(&apm_softc, sizeof(apm_softc)); 814 vmf.vmf_ah = APM_BIOS; 815 vmf.vmf_al = APM_INSTCHECK; 816 vmf.vmf_bx = 0; 817 if (vm86_intcall(APM_INT, &vmf)) 818 return ENXIO; /* APM not found */ 819 if (vmf.vmf_bx != 0x504d) { 820 printf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx); 821 return ENXIO; 822 } 823 if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) { 824 printf("apm: protected mode connections are not supported\n"); 825 return ENXIO; 826 } 827 828 apm_version = vmf.vmf_ax; 829 sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0); 830 sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0); 831 sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0); 832 833 vmf.vmf_ah = APM_BIOS; 834 vmf.vmf_al = APM_DISCONNECT; 835 vmf.vmf_bx = 0; 836 vm86_intcall(APM_INT, &vmf); /* disconnect, just in case */ 837 838 if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) { 839 vmf.vmf_ah = APM_BIOS; 840 vmf.vmf_al = APM_PROT32CONNECT; 841 vmf.vmf_bx = 0; 842 if (vm86_intcall(APM_INT, &vmf)) { 843 printf("apm: 32-bit connection error.\n"); 844 return (ENXIO); 845 } 846 sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE; 847 sc->bios.seg.code32.limit = 0xffff; 848 sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE; 849 sc->bios.seg.code16.limit = 0xffff; 850 sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE; 851 sc->bios.seg.data.limit = 0xffff; 852 sc->bios.entry = vmf.vmf_ebx; 853 sc->connectmode = APM_PROT32CONNECT; 854 } else { 855 /* use 16-bit connection */ 856 vmf.vmf_ah = APM_BIOS; 857 vmf.vmf_al = APM_PROT16CONNECT; 858 vmf.vmf_bx = 0; 859 if (vm86_intcall(APM_INT, &vmf)) { 860 printf("apm: 16-bit connection error.\n"); 861 return (ENXIO); 862 } 863 sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE; 864 sc->bios.seg.code16.limit = 0xffff; 865 sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE; 866 sc->bios.seg.data.limit = 0xffff; 867 sc->bios.entry = vmf.vmf_bx; 868 sc->connectmode = APM_PROT16CONNECT; 869 } 870 return(0); 871} 872 873 874/* 875 * return 0 if the user will notice and handle the event, 876 * return 1 if the kernel driver should do so. 877 */ 878static int 879apm_record_event(struct apm_softc *sc, u_int event_type) 880{ 881 struct apm_event_info *evp; 882 883 if ((sc->sc_flags & SCFLAG_OPEN) == 0) 884 return 1; /* no user waiting */ 885 if (sc->event_count == APM_NEVENTS) 886 return 1; /* overflow */ 887 if (sc->event_filter[event_type] == 0) 888 return 1; /* not registered */ 889 evp = &sc->event_list[sc->event_ptr]; 890 sc->event_count++; 891 sc->event_ptr++; 892 sc->event_ptr %= APM_NEVENTS; 893 evp->type = event_type; 894 evp->index = ++apm_evindex; 895 selwakeup(&sc->sc_rsel); 896 return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */ 897} 898 899/* Process APM event */ 900static void 901apm_processevent(void) 902{ 903 int apm_event; 904 struct apm_softc *sc = &apm_softc; 905 906#ifdef APM_DEBUG 907# define OPMEV_DEBUGMESSAGE(symbol) case symbol: \ 908 printf("Received APM Event: " #symbol "\n"); 909#else 910# define OPMEV_DEBUGMESSAGE(symbol) case symbol: 911#endif 912 do { 913 apm_event = apm_getevent(); 914 switch (apm_event) { 915 OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ); 916 if (apm_op_inprog == 0) { 917 apm_op_inprog++; 918 if (apm_record_event(sc, apm_event)) { 919 apm_suspend(PMST_STANDBY); 920 } 921 } 922 break; 923 OPMEV_DEBUGMESSAGE(PMEV_USERSTANDBYREQ); 924 if (apm_op_inprog == 0) { 925 apm_op_inprog++; 926 if (apm_record_event(sc, apm_event)) { 927 apm_suspend(PMST_STANDBY); 928 } 929 } 930 break; 931 OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ); 932 apm_lastreq_notify(); 933 if (apm_op_inprog == 0) { 934 apm_op_inprog++; 935 if (apm_record_event(sc, apm_event)) { 936 apm_do_suspend(); 937 } 938 } 939 return; /* XXX skip the rest */ 940 OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ); 941 apm_lastreq_notify(); 942 if (apm_op_inprog == 0) { 943 apm_op_inprog++; 944 if (apm_record_event(sc, apm_event)) { 945 apm_do_suspend(); 946 } 947 } 948 return; /* XXX skip the rest */ 949 OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND); 950 apm_do_suspend(); 951 break; 952 OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME); 953 apm_record_event(sc, apm_event); 954 apm_resume(); 955 break; 956 OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME); 957 apm_record_event(sc, apm_event); 958 apm_resume(); 959 break; 960 OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME); 961 apm_record_event(sc, apm_event); 962 apm_resume(); 963 break; 964 OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW); 965 if (apm_record_event(sc, apm_event)) { 966 apm_battery_low(); 967 apm_suspend(PMST_SUSPEND); 968 } 969 break; 970 OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE); 971 apm_record_event(sc, apm_event); 972 break; 973 OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME); 974 apm_record_event(sc, apm_event); 975 inittodr(0); /* adjust time to RTC */ 976 break; 977 OPMEV_DEBUGMESSAGE(PMEV_CAPABILITIESCHANGE); 978 apm_record_event(sc, apm_event); 979 break; 980 case PMEV_NOEVENT: 981 break; 982 default: 983 printf("Unknown Original APM Event 0x%x\n", apm_event); 984 break; 985 } 986 } while (apm_event != PMEV_NOEVENT); 987} 988 989/* 990 * Attach APM: 991 * 992 * Initialize APM driver 993 */ 994 995static int 996apm_attach(device_t dev) 997{ 998 struct apm_softc *sc = &apm_softc; 999 int flags; 1000 int drv_version; 1001 1002 if (resource_int_value("apm", 0, "flags", &flags) != 0) 1003 flags = 0; 1004 1005 if (flags & 0x20) 1006 statclock_disable = 1; 1007 1008 sc->initialized = 0; 1009 1010 /* Must be externally enabled */ 1011 sc->active = 0; 1012 1013 /* Always call HLT in idle loop */ 1014 sc->always_halt_cpu = 1; 1015 1016 /* print bootstrap messages */ 1017#ifdef APM_DEBUG 1018 printf("apm: APM BIOS version %04x\n", apm_version); 1019 printf("apm: Code16 0x%08x, Data 0x%08x\n", 1020 sc->bios.seg.code16.base, sc->bios.seg.data.base); 1021 printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n", 1022 sc->bios.entry, is_enabled(sc->slow_idle_cpu), 1023 is_enabled(!sc->disabled)); 1024 printf("apm: CS_limit=0x%x, DS_limit=0x%x\n", 1025 sc->bios.seg.code16.limit, sc->bios.seg.data.limit); 1026#endif /* APM_DEBUG */ 1027 1028 /* 1029 * In one test, apm bios version was 1.02; an attempt to register 1030 * a 1.04 driver resulted in a 1.00 connection! Registering a 1031 * 1.02 driver resulted in a 1.02 connection. 1032 */ 1033 drv_version = apm_version > 0x102 ? 0x102 : apm_version; 1034 for (; drv_version > 0x100; drv_version--) 1035 if (apm_driver_version(drv_version) == 0) 1036 break; 1037 sc->minorversion = ((drv_version & 0x00f0) >> 4) * 10 + 1038 ((drv_version & 0x000f) >> 0); 1039 sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 + 1040 ((apm_version & 0x0f00) >> 8); 1041 1042 sc->intversion = INTVERSION(sc->majorversion, sc->minorversion); 1043 1044#ifdef APM_DEBUG 1045 if (sc->intversion >= INTVERSION(1, 1)) 1046 printf("apm: Engaged control %s\n", is_enabled(!sc->disengaged)); 1047#endif 1048 1049 printf("apm: found APM BIOS v%ld.%ld, connected at v%d.%d\n", 1050 ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8), 1051 ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0), 1052 sc->majorversion, sc->minorversion); 1053 1054#ifdef APM_DEBUG 1055 printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu)); 1056#endif 1057 1058 /* enable power management */ 1059 if (sc->disabled) { 1060 if (apm_enable_disable_pm(1)) { 1061#ifdef APM_DEBUG 1062 printf("apm: *Warning* enable function failed! [%x]\n", 1063 (sc->bios.r.eax >> 8) & 0xff); 1064#endif 1065 } 1066 } 1067 1068 /* engage power managment (APM 1.1 or later) */ 1069 if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) { 1070 if (apm_engage_disengage_pm(1)) { 1071#ifdef APM_DEBUG 1072 printf("apm: *Warning* engage function failed err=[%x]", 1073 (sc->bios.r.eax >> 8) & 0xff); 1074 printf(" (Docked or using external power?).\n"); 1075#endif 1076 } 1077 } 1078 1079 /* default suspend hook */ 1080 sc->sc_suspend.ah_fun = apm_default_suspend; 1081 sc->sc_suspend.ah_arg = sc; 1082 sc->sc_suspend.ah_name = "default suspend"; 1083 sc->sc_suspend.ah_order = APM_MAX_ORDER; 1084 1085 /* default resume hook */ 1086 sc->sc_resume.ah_fun = apm_default_resume; 1087 sc->sc_resume.ah_arg = sc; 1088 sc->sc_resume.ah_name = "default resume"; 1089 sc->sc_resume.ah_order = APM_MIN_ORDER; 1090 1091 apm_hook_establish(APM_HOOK_SUSPEND, &sc->sc_suspend); 1092 apm_hook_establish(APM_HOOK_RESUME , &sc->sc_resume); 1093 1094 /* Power the system off using APM */ 1095 EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL, 1096 SHUTDOWN_PRI_LAST); 1097 1098 sc->initialized = 1; 1099 1100 make_dev(&apm_cdevsw, 0, 0, 5, 0660, "apm"); 1101 make_dev(&apm_cdevsw, 8, 0, 5, 0660, "apmctl"); 1102 return 0; 1103} 1104 1105static int 1106apmopen(dev_t dev, int flag, int fmt, struct proc *p) 1107{ 1108 struct apm_softc *sc = &apm_softc; 1109 int ctl = APMDEV(dev); 1110 1111 if (!sc->initialized) 1112 return (ENXIO); 1113 1114 switch (ctl) { 1115 case APMDEV_CTL: 1116 if (!(flag & FWRITE)) 1117 return EINVAL; 1118 if (sc->sc_flags & SCFLAG_OCTL) 1119 return EBUSY; 1120 sc->sc_flags |= SCFLAG_OCTL; 1121 bzero(sc->event_filter, sizeof sc->event_filter); 1122 break; 1123 case APMDEV_NORMAL: 1124 sc->sc_flags |= SCFLAG_ONORMAL; 1125 break; 1126 default: 1127 return ENXIO; 1128 break; 1129 } 1130 return 0; 1131} 1132 1133static int 1134apmclose(dev_t dev, int flag, int fmt, struct proc *p) 1135{ 1136 struct apm_softc *sc = &apm_softc; 1137 int ctl = APMDEV(dev); 1138 1139 switch (ctl) { 1140 case APMDEV_CTL: 1141 apm_lastreq_rejected(); 1142 sc->sc_flags &= ~SCFLAG_OCTL; 1143 bzero(sc->event_filter, sizeof sc->event_filter); 1144 break; 1145 case APMDEV_NORMAL: 1146 sc->sc_flags &= ~SCFLAG_ONORMAL; 1147 break; 1148 } 1149 if ((sc->sc_flags & SCFLAG_OPEN) == 0) { 1150 sc->event_count = 0; 1151 sc->event_ptr = 0; 1152 } 1153 return 0; 1154} 1155 1156static int 1157apmioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p) 1158{ 1159 struct apm_softc *sc = &apm_softc; 1160 struct apm_bios_arg *args; 1161 int error = 0; 1162 int ret; 1163 int newstate; 1164 1165 if (!sc->initialized) 1166 return (ENXIO); 1167#ifdef APM_DEBUG 1168 printf("APM ioctl: cmd = 0x%x\n", cmd); 1169#endif 1170 switch (cmd) { 1171 case APMIO_SUSPEND: 1172 if (!(flag & FWRITE)) 1173 return (EPERM); 1174 if (sc->active) 1175 apm_suspend(PMST_SUSPEND); 1176 else 1177 error = EINVAL; 1178 break; 1179 1180 case APMIO_STANDBY: 1181 if (!(flag & FWRITE)) 1182 return (EPERM); 1183 if (sc->active) 1184 apm_suspend(PMST_STANDBY); 1185 else 1186 error = EINVAL; 1187 break; 1188 1189 case APMIO_GETINFO_OLD: 1190 { 1191 struct apm_info info; 1192 apm_info_old_t aiop; 1193 1194 if (apm_get_info(&info)) 1195 error = ENXIO; 1196 aiop = (apm_info_old_t)addr; 1197 aiop->ai_major = info.ai_major; 1198 aiop->ai_minor = info.ai_minor; 1199 aiop->ai_acline = info.ai_acline; 1200 aiop->ai_batt_stat = info.ai_batt_stat; 1201 aiop->ai_batt_life = info.ai_batt_life; 1202 aiop->ai_status = info.ai_status; 1203 } 1204 break; 1205 case APMIO_GETINFO: 1206 if (apm_get_info((apm_info_t)addr)) 1207 error = ENXIO; 1208 break; 1209 case APMIO_ENABLE: 1210 if (!(flag & FWRITE)) 1211 return (EPERM); 1212 apm_event_enable(); 1213 break; 1214 case APMIO_DISABLE: 1215 if (!(flag & FWRITE)) 1216 return (EPERM); 1217 apm_event_disable(); 1218 break; 1219 case APMIO_HALTCPU: 1220 if (!(flag & FWRITE)) 1221 return (EPERM); 1222 apm_halt_cpu(); 1223 break; 1224 case APMIO_NOTHALTCPU: 1225 if (!(flag & FWRITE)) 1226 return (EPERM); 1227 apm_not_halt_cpu(); 1228 break; 1229 case APMIO_DISPLAY: 1230 if (!(flag & FWRITE)) 1231 return (EPERM); 1232 newstate = *(int *)addr; 1233 if (apm_display(newstate)) 1234 error = ENXIO; 1235 break; 1236 case APMIO_BIOS: 1237 if (!(flag & FWRITE)) 1238 return (EPERM); 1239 /* XXX compatibility with the old interface */ 1240 args = (struct apm_bios_arg *)addr; 1241 sc->bios.r.eax = args->eax; 1242 sc->bios.r.ebx = args->ebx; 1243 sc->bios.r.ecx = args->ecx; 1244 sc->bios.r.edx = args->edx; 1245 sc->bios.r.esi = args->esi; 1246 sc->bios.r.edi = args->edi; 1247 if ((ret = apm_bioscall())) { 1248 /* 1249 * Return code 1 means bios call was unsuccessful. 1250 * Error code is stored in %ah. 1251 * Return code -1 means bios call was unsupported 1252 * in the APM BIOS version. 1253 */ 1254 if (ret == -1) { 1255 error = EINVAL; 1256 } 1257 } else { 1258 /* 1259 * Return code 0 means bios call was successful. 1260 * We need only %al and can discard %ah. 1261 */ 1262 sc->bios.r.eax &= 0xff; 1263 } 1264 args->eax = sc->bios.r.eax; 1265 args->ebx = sc->bios.r.ebx; 1266 args->ecx = sc->bios.r.ecx; 1267 args->edx = sc->bios.r.edx; 1268 args->esi = sc->bios.r.esi; 1269 args->edi = sc->bios.r.edi; 1270 break; 1271 default: 1272 error = EINVAL; 1273 break; 1274 } 1275 1276 /* for /dev/apmctl */ 1277 if (APMDEV(dev) == APMDEV_CTL) { 1278 struct apm_event_info *evp; 1279 int i; 1280 1281 error = 0; 1282 switch (cmd) { 1283 case APMIO_NEXTEVENT: 1284 if (!sc->event_count) { 1285 error = EAGAIN; 1286 } else { 1287 evp = (struct apm_event_info *)addr; 1288 i = sc->event_ptr + APM_NEVENTS - sc->event_count; 1289 i %= APM_NEVENTS; 1290 *evp = sc->event_list[i]; 1291 sc->event_count--; 1292 } 1293 break; 1294 case APMIO_REJECTLASTREQ: 1295 if (apm_lastreq_rejected()) { 1296 error = EINVAL; 1297 } 1298 break; 1299 default: 1300 error = EINVAL; 1301 break; 1302 } 1303 } 1304 1305 return error; 1306} 1307 1308static int 1309apmwrite(dev_t dev, struct uio *uio, int ioflag) 1310{ 1311 struct apm_softc *sc = &apm_softc; 1312 u_int event_type; 1313 int error; 1314 u_char enabled; 1315 1316 if (APMDEV(dev) != APMDEV_CTL) 1317 return(ENODEV); 1318 if (uio->uio_resid != sizeof(u_int)) 1319 return(E2BIG); 1320 1321 if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio))) 1322 return(error); 1323 1324 if (event_type < 0 || event_type >= APM_NPMEV) 1325 return(EINVAL); 1326 1327 if (sc->event_filter[event_type] == 0) { 1328 enabled = 1; 1329 } else { 1330 enabled = 0; 1331 } 1332 sc->event_filter[event_type] = enabled; 1333#ifdef APM_DEBUG 1334 printf("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled)); 1335#endif 1336 1337 return uio->uio_resid; 1338} 1339 1340static int 1341apmpoll(dev_t dev, int events, struct proc *p) 1342{ 1343 struct apm_softc *sc = &apm_softc; 1344 int revents = 0; 1345 1346 if (events & (POLLIN | POLLRDNORM)) { 1347 if (sc->event_count) { 1348 revents |= events & (POLLIN | POLLRDNORM); 1349 } else { 1350 selrecord(p, &sc->sc_rsel); 1351 } 1352 } 1353 1354 return (revents); 1355} 1356 1357static device_method_t apm_methods[] = { 1358 /* Device interface */ 1359 DEVMETHOD(device_identify, apm_identify), 1360 DEVMETHOD(device_probe, apm_probe), 1361 DEVMETHOD(device_attach, apm_attach), 1362 1363 { 0, 0 } 1364}; 1365 1366static driver_t apm_driver = { 1367 "apm", 1368 apm_methods, 1369 1, /* no softc (XXX) */ 1370}; 1371 1372static devclass_t apm_devclass; 1373 1374DRIVER_MODULE(apm, nexus, apm_driver, apm_devclass, 0, 0); 1375