Extend timer driver API to report also minimal and maximal supported period

lengths. Make MI wrapper code to validate periods in request. Make kernel
clock management code to honor these hardware limitations while choosing hz,
stathz and profhz values.

1 files changed, 11 insertions, 5 deletions

diff --git a/sys/dev/acpica/acpi_hpet.c b/sys/dev/acpica/acpi_hpet.c
index 95f2b32..a789418 100644
--- a/sys/dev/acpica/acpi_hpet.c
+++ b/sys/dev/acpica/acpi_hpet.c
@@ -154,15 +154,16 @@ hpet_start(struct eventtimer *et,
 		t->div = (sc->freq * (period->frac >> 32)) >> 32;
 		if (period->sec != 0)
 			t->div += sc->freq * period->sec;
-		if (first == NULL)
-			first = period;
 	} else {
 		t->mode = 2;
 		t->div = 0;
 	}
-	fdiv = (sc->freq * (first->frac >> 32)) >> 32;
-	if (first->sec != 0)
-		fdiv += sc->freq * first->sec;
+	if (first != NULL) {
+		fdiv = (sc->freq * (first->frac >> 32)) >> 32;
+		if (first->sec != 0)
+			fdiv += sc->freq * first->sec;
+	} else
+		fdiv = t->div;
 	t->last = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
 	if (t->mode == 1 && (t->caps & HPET_TCAP_PER_INT)) {
 		t->caps |= HPET_TCNF_TYPE;
@@ -583,6 +584,11 @@ hpet_attach(device_t dev)
 		if ((t->caps & HPET_TCAP_PER_INT) == 0)
 			t->et.et_quality -= 10;
 		t->et.et_frequency = sc->freq;
+		t->et.et_min_period.sec = 0;
+		t->et.et_min_period.frac = 0x00004000LL << 32;
+		t->et.et_max_period.sec = 0xffffffff / sc->freq;
+		t->et.et_max_period.frac =
+		    ((0xffffffffLL << 32) / sc->freq) << 32;
 		t->et.et_start = hpet_start;
 		t->et.et_stop = hpet_stop;
 		t->et.et_priv = &sc->t[i];