#define APM_DEBUG 1 /* * LP (Laptop Package) * * Copyright (c) 1994 by HOSOKAWA, Tatsumi * * 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 1.6 1994/11/07 04:23:58 phk Exp $ */ #include "apm.h" #if NAPM > 0 #include #include "conf.h" #include #include #include #include #include #include #include #include #include "i386/isa/isa.h" #include "i386/isa/isa_device.h" #include #include #include #include #include #include "apm_setup.h" /* static data */ static int apm_initialized = 0, active = 0, halt_cpu = 1; static u_int minorversion, majorversion; static u_int cs32_base, cs16_base, ds_base; static u_int cs_limit, ds_limit; static u_int cs_entry; static u_int intversion; static int idle_cpu, disabled, disengaged; #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; /* 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; int apm_errno; inline int apm_int(u_long *eax,u_long *ebx,u_long *ecx) { u_long cf; __asm ("pushl %%ebp pushl %%edx xorl %3,%3 lcall _apm_addr jnc 1f incl %3 1: 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(int enable) { u_long eax,ebx,ecx; eax = (APM_BIOS<<8) | APM_ENABLEDISABLEPM; if (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() { u_long eax,ebx,ecx,i; #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(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(void) { u_long eax,ebx,ecx; eax = (APM_BIOS<<8) | APM_GETPMEVENT; 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; } /* APM Battery low handler */ static void apm_battery_low(void) { printf("\007\007 * * * BATTERY IS LOW * * * \007\007"); } static struct timeval suspend_time; static int apm_default_resume(void) { u_int second, minute, hour; struct timeval resume_time; inittodr(0); /* adjust time to RTC */ microtime(&resume_time); 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) { int pl; microtime(&suspend_time); apm_suspend_system(); return 0; } /* get APM information */ static int apm_get_info(apm_info_t aip) { u_long eax,ebx,ecx; eax = (APM_BIOS<<8)|APM_GETPWSTATUS; ebx = PMDV_ALLDEV; 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)majorversion; aip->ai_minor = (u_int)minorversion; return 0; } static void apm_processevent(void); /* inform APM BIOS that CPU is idle */ void apm_cpu_idle(void) { if (idle_cpu) { if (active) { __asm ("movw $0x5305, %ax; lcall _apm_addr"); } } /* * 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 (!active || halt_cpu) { __asm("sti ; hlt"); /* wait for interrupt */ } } /* inform APM BIOS that CPU is busy */ void apm_cpu_busy(void) { if (idle_cpu && active) { __asm("movw $0x5306, %ax; lcall _apm_addr"); } } /* * APM timeout routine: * * This routine is automatically called by timer once per second. */ static void apm_timeout(void *arg1) { apm_processevent(); timeout(apm_timeout, NULL, hz ); /* 1 Hz */ } /* enable APM BIOS */ static void apm_event_enable(void) { #ifdef APM_DEBUG printf("called apm_event_enable()\n"); #endif if (apm_initialized) { active = 1; timeout(apm_timeout, NULL, 2 * hz); } } /* disable APM BIOS */ static void apm_event_disable(void) { #ifdef APM_DEBUG printf("called apm_event_disable()\n"); #endif if (apm_initialized) { untimeout(apm_timeout, NULL); active = 0; } } /* halt CPU in scheduling loop */ static void apm_halt_cpu(void) { if (apm_initialized) { halt_cpu = 1; } } /* don't halt CPU in scheduling loop */ static void apm_not_halt_cpu(void) { if (apm_initialized) { halt_cpu = 0; } } /* device driver definitions */ int apmprobe (struct isa_device *); 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. */ int apmprobe(struct isa_device *dvp) { switch (apm_version) { case APMINI_CANTFIND: /* silent */ return 0; case APMINI_NOT32BIT: printf("apm%d: 32bit connection is not supported.\n", dvp->id_unit); return 0; case APMINI_CONNECTERR: printf("apm%d: 32-bit connection error.\n", dvp->id_unit); return 0; } if ((apm_version & 0xff00) != 0x0100) return 0; if ((apm_version & 0x00f0) >= 0x00a0) return 0; if ((apm_version & 0x000f) >= 0x000a) return 0; return -1; } /* Process APM event */ static void apm_processevent(void) { 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(); if (apm_event == PMEV_NOEVENT) break; switch (apm_event) { OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ); apm_default_suspend(); break; OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ); apm_default_suspend(); break; OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ); apm_default_suspend(); break; OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND); apm_default_suspend(); break; OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME); apm_default_resume(); break; OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME); apm_default_resume(); break; OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME); apm_default_resume(); break; OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW); apm_battery_low(); apm_default_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) * * Now, unless I'm mad, (not quite ruled out yet), the APM-1.1 spec is bogus: * * Appendix C says under the header "APM 1.0/APM 1.1 Modal BIOS Behavior" * that "When an APM Driver connects with an APM 1.1 BIOS, the APM 1.1 BIOS * will default to an APM 1.0 connection. After an APM Driver calls the APM * Driver Version function, specifying that it supports APM 1.1, and [sic!] * APM BIOS will change its behavior to an APM 1.1 connection. If the APM * BIOS is an APM 1.0 BIOS, the APM Driver Version function call will fail, * and the connection will remain an APM 1.0 connection." * * OK so I can establish a 1.0 connection, and then tell that I'm a 1.1 * and maybe then the BIOS will tell that it too is a 1.1. * Fine. * Now how will I ever get the segment-limits for instance ? There is no * way I can see that I can get a 1.1 response back from an "APM Protected * Mode 32-bit Interface Connect" function ??? * * Who made this, Intel and Microsoft ? -- How did you guess ! * * /phk */ int apmattach(struct isa_device *dvp) { /* setup APM parameters */ cs32_base = (apm_cs32_base << 4) + KERNBASE; cs16_base = (apm_cs16_base << 4) + KERNBASE; ds_base = (apm_ds_base << 4) + KERNBASE; cs_limit = apm_cs_limit; ds_limit = apm_ds_limit; cs_entry = apm_cs_entry; idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0); disabled = ((apm_flags & APM_DISABLED) != 0); disengaged = ((apm_flags & APM_DISENGAGED) != 0); /* print bootstrap messages */ #ifdef APM_DEBUG printf(" found APM BIOS version %04x\n", apm_version); printf("apm%d: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n", dvp->id_unit, cs32_base, cs16_base, ds_base); printf("apm%d: Code entry 0x%08x, Idling CPU %s, Management %s\n", dvp->id_unit, cs_entry, is_enabled(idle_cpu), is_enabled(!disabled)); printf("apm%d: CS_limit=%x, DS_limit=%x\n", dvp->id_unit, cs_limit,ds_limit); #endif /* APM_DEBUG */ cs_limit = 0xffff; ds_limit = 0xffff; /* setup GDT */ setup_apm_gdt(cs32_base, cs16_base, ds_base, cs_limit, ds_limit); /* setup entry point 48bit pointer */ apm_addr.segment = GSEL(GAPMCODE32_SEL, SEL_KPL); apm_addr.offset = cs_entry; /* Try to kick bios into 1.1 mode */ apm_driver_version(); minorversion = ((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0); majorversion = ((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8); intversion = INTVERSION(majorversion, minorversion); if (intversion >= INTVERSION(1, 1)) { printf("apm%d: Engaged control %s\n", dvp->id_unit, is_enabled(!disengaged)); } printf(" found APM BIOS version %d.%d\n", majorversion, minorversion); printf("apm%d: Idling CPU %s\n", dvp->id_unit, is_enabled(idle_cpu)); /* enable power management */ if (disabled) { if (apm_enable_disable_pm(1)) { printf("Warning: APM enable function failed! [%x]\n", apm_errno); } } /* engage power managment (APM 1.1 or later) */ if (intversion >= INTVERSION(1, 1) && disengaged) { if (apm_engage_disengage_pm(1)) { printf("Warning: APM engage function failed [%x]\n", apm_errno); } } apm_initialized = 1; apm_event_enable(); return 0; } int apmopen(dev_t dev, int flag, int fmt, struct proc *p) { if (!apm_initialized) { return ENXIO; } if (minor(dev)) return (ENXIO); return 0; } int apmclose(dev_t dev, int flag, int fmt, struct proc *p) { return 0; } int apmioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p) { int error = 0; int pl; #ifdef APM_DEBUG printf("APM ioctl: minor = %d, cmd = 0x%x\n", minor(dev), cmd); #endif pl = splhigh(); if (minor(dev) != 0) { return ENXIO; } if (!apm_initialized) { return ENXIO; } switch (cmd) { case APMIO_SUSPEND: apm_default_suspend(); 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; default: error = EINVAL; break; } splx(pl); return error; } #endif /* NAPM > 0 */