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Add some comments on the APM specs, and make the APM 'idle/busy'

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functions follow them.
This commit is contained in:
Nate Williams 1996-03-19 16:56:56 +00:00
parent 454dc1433b
commit 94ed0b7b90
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=14715
2 changed files with 50 additions and 38 deletions
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44
sys/i386/apm/apm.c
View File

@ -13,7 +13,7 @@
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.34 1996/03/19 04:49:13 nate Exp $
* $Id: apm.c,v 1.35 1996/03/19 16:48:38 nate Exp $
*/
#include "apm.h"
@ -52,13 +52,14 @@ static void apm_resume __P((void));
/* static data */
struct apm_softc {
int initialized, active, halt_cpu;
int initialized, active;
int always_halt_cpu, slow_idle_cpu;
int disabled, disengaged;
u_int minorversion, majorversion;
u_int cs32_base, cs16_base, ds_base;
u_int cs_limit, ds_limit;
u_int cs_entry;
u_int intversion;
int idle_cpu, disabled, disengaged;
struct apmhook sc_suspend;
struct apmhook sc_resume;
void *sc_devfs_token;
@ -499,14 +500,12 @@ apm_cpu_idle(void)
{
struct apm_softc *sc = &apm_softc;
if (sc->idle_cpu) {
if (sc->active) {
u_long eax, ebx, ecx;
if (sc->active) {
u_long eax, ebx, ecx;
eax = (APM_BIOS <<8) | APM_CPUIDLE;
ecx = ebx = 0;
apm_int(&eax, &ebx, &ecx);
}
eax = (APM_BIOS <<8) | APM_CPUIDLE;
ecx = ebx = 0;
apm_int(&eax, &ebx, &ecx);
}
/*
* Some APM implementation halts CPU in BIOS, whenever
@ -518,7 +517,7 @@ apm_cpu_idle(void)
* "hlt" operation from swtch() and managed it under
* APM driver.
*/
if (!sc->active || sc->halt_cpu) {
if (!sc->active || sc->always_halt_cpu) {
__asm("hlt"); /* wait for interrupt */
}
}
@ -529,10 +528,15 @@ apm_cpu_busy(void)
{
struct apm_softc *sc = &apm_softc;
if (sc->idle_cpu && sc->active) {
/*
* The APM specification says this is only necessary if your BIOS
* slows down the processor in the idle task, otherwise it's not
* necessary.
*/
if (sc->slow_idle_cpu && sc->active) {
u_long eax, ebx, ecx;
eax = (APM_BIOS <<8) | APM_CPUIDLE;
eax = (APM_BIOS <<8) | APM_CPUBUSY;
ecx = ebx = 0;
apm_int(&eax, &ebx, &ecx);
}
@ -587,7 +591,7 @@ static void
apm_halt_cpu(struct apm_softc *sc)
{
if (sc->initialized) {
sc->halt_cpu = 1;
sc->always_halt_cpu = 1;
}
}
@ -596,7 +600,7 @@ static void
apm_not_halt_cpu(struct apm_softc *sc)
{
if (sc->initialized) {
sc->halt_cpu = 0;
sc->always_halt_cpu = 0;
}
}
@ -721,8 +725,10 @@ apmattach(struct isa_device *dvp)
sc->ds_limit = apm_ds_limit;
sc->cs_entry = apm_cs_entry;
sc->halt_cpu = 1;
sc->idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
/* Always call HLT in idle loop */
sc->always_halt_cpu = 1;
sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
sc->disabled = ((apm_flags & APM_DISABLED) != 0);
sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
@ -732,7 +738,7 @@ apmattach(struct isa_device *dvp)
printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
sc->cs32_base, sc->cs16_base, sc->ds_base);
printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
sc->cs_entry, is_enabled(sc->idle_cpu),
sc->cs_entry, is_enabled(sc->slow_idle_cpu),
is_enabled(!sc->disabled));
printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
#endif /* APM_DEBUG */
@ -764,7 +770,7 @@ apmattach(struct isa_device *dvp)
printf(" found APM BIOS version %d.%d\n",
sc->majorversion, sc->minorversion);
printf("apm: Idling CPU %s\n", is_enabled(sc->idle_cpu));
printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
/* enable power management */
if (sc->disabled) {

44
sys/i386/bios/apm.c
View File

@ -13,7 +13,7 @@
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*
* $Id: apm.c,v 1.34 1996/03/19 04:49:13 nate Exp $
* $Id: apm.c,v 1.35 1996/03/19 16:48:38 nate Exp $
*/
#include "apm.h"
@ -52,13 +52,14 @@ static void apm_resume __P((void));
/* static data */
struct apm_softc {
int initialized, active, halt_cpu;
int initialized, active;
int always_halt_cpu, slow_idle_cpu;
int disabled, disengaged;
u_int minorversion, majorversion;
u_int cs32_base, cs16_base, ds_base;
u_int cs_limit, ds_limit;
u_int cs_entry;
u_int intversion;
int idle_cpu, disabled, disengaged;
struct apmhook sc_suspend;
struct apmhook sc_resume;
void *sc_devfs_token;
@ -499,14 +500,12 @@ apm_cpu_idle(void)
{
struct apm_softc *sc = &apm_softc;
if (sc->idle_cpu) {
if (sc->active) {
u_long eax, ebx, ecx;
if (sc->active) {
u_long eax, ebx, ecx;
eax = (APM_BIOS <<8) | APM_CPUIDLE;
ecx = ebx = 0;
apm_int(&eax, &ebx, &ecx);
}
eax = (APM_BIOS <<8) | APM_CPUIDLE;
ecx = ebx = 0;
apm_int(&eax, &ebx, &ecx);
}
/*
* Some APM implementation halts CPU in BIOS, whenever
@ -518,7 +517,7 @@ apm_cpu_idle(void)
* "hlt" operation from swtch() and managed it under
* APM driver.
*/
if (!sc->active || sc->halt_cpu) {
if (!sc->active || sc->always_halt_cpu) {
__asm("hlt"); /* wait for interrupt */
}
}
@ -529,10 +528,15 @@ apm_cpu_busy(void)
{
struct apm_softc *sc = &apm_softc;
if (sc->idle_cpu && sc->active) {
/*
* The APM specification says this is only necessary if your BIOS
* slows down the processor in the idle task, otherwise it's not
* necessary.
*/
if (sc->slow_idle_cpu && sc->active) {
u_long eax, ebx, ecx;
eax = (APM_BIOS <<8) | APM_CPUIDLE;
eax = (APM_BIOS <<8) | APM_CPUBUSY;
ecx = ebx = 0;
apm_int(&eax, &ebx, &ecx);
}
@ -587,7 +591,7 @@ static void
apm_halt_cpu(struct apm_softc *sc)
{
if (sc->initialized) {
sc->halt_cpu = 1;
sc->always_halt_cpu = 1;
}
}
@ -596,7 +600,7 @@ static void
apm_not_halt_cpu(struct apm_softc *sc)
{
if (sc->initialized) {
sc->halt_cpu = 0;
sc->always_halt_cpu = 0;
}
}
@ -721,8 +725,10 @@ apmattach(struct isa_device *dvp)
sc->ds_limit = apm_ds_limit;
sc->cs_entry = apm_cs_entry;
sc->halt_cpu = 1;
sc->idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
/* Always call HLT in idle loop */
sc->always_halt_cpu = 1;
sc->slow_idle_cpu = ((apm_flags & APM_CPUIDLE_SLOW) != 0);
sc->disabled = ((apm_flags & APM_DISABLED) != 0);
sc->disengaged = ((apm_flags & APM_DISENGAGED) != 0);
@ -732,7 +738,7 @@ apmattach(struct isa_device *dvp)
printf("apm: Code32 0x%08x, Code16 0x%08x, Data 0x%08x\n",
sc->cs32_base, sc->cs16_base, sc->ds_base);
printf("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
sc->cs_entry, is_enabled(sc->idle_cpu),
sc->cs_entry, is_enabled(sc->slow_idle_cpu),
is_enabled(!sc->disabled));
printf("apm: CS_limit=%x, DS_limit=%x\n", sc->cs_limit, sc->ds_limit);
#endif /* APM_DEBUG */
@ -764,7 +770,7 @@ apmattach(struct isa_device *dvp)
printf(" found APM BIOS version %d.%d\n",
sc->majorversion, sc->minorversion);
printf("apm: Idling CPU %s\n", is_enabled(sc->idle_cpu));
printf("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
/* enable power management */
if (sc->disabled) {