freebsd-skq/sys/i386/bios/apm.c
1994-11-07 04:23:58 +00:00

620 lines
13 KiB
C

#define APM_DEBUG 1
/*
* LP (Laptop Package)
*
* Copyright (c) 1994 by HOSOKAWA, Tatsumi <hosokawa@mt.cs.keio.ac.jp>
*
* This software may be used, modified, copied, and distributed, in
* both source and binary form provided that the above copyright and
* these terms are retained. Under no circumstances is the author
* responsible for the proper functioning of this software, nor does
* the author assume any responsibility for damages incurred with its
* use.
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.5 1994/10/02 17:40:38 phk Exp $
*/
#include "apm.h"
#if NAPM > 0
#include <sys/param.h>
#include "conf.h"
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include "i386/isa/isa.h"
#include "i386/isa/isa_device.h"
#include <machine/apm_bios.h>
#include <machine/segments.h>
#include <machine/clock.h>
#include <vm/vm.h>
#include <sys/syslog.h>
#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);
ssdtosd(gdt_segs + GAPMCODE16_SEL, gdt + GAPMCODE16_SEL);
ssdtosd(gdt_segs + GAPMDATA_SEL , gdt + GAPMDATA_SEL );
}
/* 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 */