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For AIM, have cpu_idle() set MSR_POW when the powerpc_pow_enabled

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variable is set. On my Mac Mini this puts the CPU in NAP mode when
the kernel is idle and, any technical or environmental reasons
aside, avoids that I have to listen to the fan all day :-)
This commit is contained in:
Marcel Moolenaar 2008-03-07 22:27:06 +00:00
parent d6f5929710
commit 8a109fa3d8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=176919
4 changed files with 16 additions and 11 deletions
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3
sys/powerpc/aim/locore.S
View File

@ -89,9 +89,6 @@ GLOBAL(esym)
GLOBAL(ofmsr)
.long 0, 0, 0, 0, 0 /* msr/sprg0-3 used in Open Firmware */
GLOBAL(powersave)
.long 0
#define INTSTK 16384 /* 16K interrupt stack */
#define INTRCNT_COUNT 256 /* max(HROWPIC_IRQMAX,OPENPIC_IRQMAX) */
GLOBAL(intrnames)

12
sys/powerpc/aim/machdep.c
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@ -107,6 +107,7 @@ __FBSDID("$FreeBSD$");
#include <machine/cpu.h>
#include <machine/elf.h>
#include <machine/fpu.h>
#include <machine/hid.h>
#include <machine/kdb.h>
#include <machine/md_var.h>
#include <machine/metadata.h>
@ -737,15 +738,22 @@ cpu_halt(void)
void
cpu_idle(void)
{
/* TODO: Insert code to halt (until next interrupt) */
uint32_t msr;
msr = mfmsr();
#ifdef INVARIANTS
if ((mfmsr() & PSL_EE) != PSL_EE) {
if ((msr & PSL_EE) != PSL_EE) {
struct thread *td = curthread;
printf("td msr %x\n", td->td_md.md_saved_msr);
panic("ints disabled in idleproc!");
}
#endif
if (powerpc_pow_enabled) {
__asm __volatile("sync");
mtmsr(msr | PSL_POW);
isync();
}
}
/*

2
sys/powerpc/include/md_var.h
View File

@ -44,6 +44,8 @@ extern vm_offset_t kstack0_phys;
extern u_long ns_per_tick;
extern int powerpc_pow_enabled;
#if defined(_KERNEL) || defined(_STANDALONE)
#define CACHELINESIZE 32
#endif

10
sys/powerpc/powerpc/cpu.c
View File

@ -70,6 +70,8 @@
#include <machine/md_var.h>
#include <machine/spr.h>
int powerpc_pow_enabled;
struct cputab {
const char *name;
uint16_t version;
@ -183,9 +185,7 @@ cpu_setup(u_int cpuid)
/* Select DOZE mode. */
hid0 &= ~(HID0_DOZE | HID0_NAP | HID0_SLEEP);
hid0 |= HID0_DOZE | HID0_DPM;
#ifdef notyet
powersave = 1;
#endif
powerpc_pow_enabled = 1;
break;
case MPC7448:
@ -203,9 +203,7 @@ cpu_setup(u_int cpuid)
/* Select NAP mode. */
hid0 &= ~(HID0_DOZE | HID0_NAP | HID0_SLEEP);
hid0 |= HID0_NAP | HID0_DPM;
#ifdef notyet
powersave = 0; /* but don't use it */
#endif
powerpc_pow_enabled = 1;
break;
default: