PERFORCE change 79399 for review
Peter Wemm
peter at FreeBSD.org
Fri Jul 1 18:42:54 GMT 2005
http://perforce.freebsd.org/chv.cgi?CH=79399
Change 79399 by peter at peter_overcee on 2005/07/01 18:41:52
integ -b i386_hammer (notably the i8254 simple timecounter)
Affected files ...
.. //depot/projects/hammer/sys/amd64/amd64/dump_machdep.c#23 integrate
.. //depot/projects/hammer/sys/amd64/amd64/identcpu.c#43 integrate
.. //depot/projects/hammer/sys/amd64/amd64/initcpu.c#13 integrate
.. //depot/projects/hammer/sys/amd64/amd64/local_apic.c#55 integrate
.. //depot/projects/hammer/sys/amd64/amd64/machdep.c#137 integrate
.. //depot/projects/hammer/sys/amd64/amd64/mp_machdep.c#101 integrate
.. //depot/projects/hammer/sys/amd64/amd64/trap.c#69 integrate
.. //depot/projects/hammer/sys/amd64/include/md_var.h#33 integrate
.. //depot/projects/hammer/sys/amd64/include/pmap.h#56 integrate
.. //depot/projects/hammer/sys/amd64/isa/clock.c#42 integrate
Differences ...
==== //depot/projects/hammer/sys/amd64/amd64/dump_machdep.c#23 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/amd64/identcpu.c#43 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/amd64/initcpu.c#13 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/amd64/local_apic.c#55 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/amd64/machdep.c#137 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/amd64/mp_machdep.c#101 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/amd64/trap.c#69 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/include/md_var.h#33 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/include/pmap.h#56 (text+ko) ====
==== //depot/projects/hammer/sys/amd64/isa/clock.c#42 (text+ko) ====
@@ -127,6 +127,7 @@
static u_char timer2_state;
static unsigned i8254_get_timecount(struct timecounter *tc);
+static unsigned i8254_simple_get_timecount(struct timecounter *tc);
static void set_timer_freq(u_int freq, int intr_freq);
static struct timecounter i8254_timecounter = {
@@ -518,10 +519,15 @@
{
int new_timer0_max_count;
+ i8254_timecounter.tc_frequency = freq;
mtx_lock_spin(&clock_lock);
timer_freq = freq;
new_timer0_max_count = hardclock_max_count = TIMER_DIV(intr_freq);
- if (new_timer0_max_count != timer0_max_count) {
+ if (using_lapic_timer) {
+ outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
+ outb(TIMER_CNTR0, 0);
+ outb(TIMER_CNTR0, 0);
+ } else if (new_timer0_max_count != timer0_max_count) {
timer0_max_count = new_timer0_max_count;
outb(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16BIT);
outb(TIMER_CNTR0, timer0_max_count & 0xff);
@@ -575,7 +581,6 @@
}
set_timer_freq(timer_freq, hz);
- i8254_timecounter.tc_frequency = timer_freq;
tc_init(&i8254_timecounter);
init_TSC();
@@ -728,15 +733,21 @@
/*
* If we aren't using the local APIC timer to drive the kernel
* clocks, setup the interrupt handler for the 8254 timer 0 so
- * that it can drive hardclock().
+ * that it can drive hardclock(). Otherwise, change the 8254
+ * timecounter to user a simpler algorithm.
*/
- if (!using_lapic_timer) {
+ if (!using_lapic_timer || 1) {
intr_add_handler("clk", 0, (driver_intr_t *)clkintr, NULL,
INTR_TYPE_CLK | INTR_FAST, NULL);
i8254_intsrc = intr_lookup_source(0);
if (i8254_intsrc != NULL)
i8254_pending =
i8254_intsrc->is_pic->pic_source_pending;
+ } else {
+ i8254_timecounter.tc_get_timecount =
+ i8254_simple_get_timecount;
+ i8254_timecounter.tc_counter_mask = 0xffff;
+ set_timer_freq(timer_freq, hz);
}
/* Initialize RTC. */
@@ -804,10 +815,8 @@
*/
freq = timer_freq;
error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
- if (error == 0 && req->newptr != NULL) {
+ if (error == 0 && req->newptr != NULL)
set_timer_freq(freq, hz);
- i8254_timecounter.tc_frequency = freq;
- }
return (error);
}
@@ -815,6 +824,24 @@
0, sizeof(u_int), sysctl_machdep_i8254_freq, "IU", "");
static unsigned
+i8254_simple_get_timecount(struct timecounter *tc)
+{
+ u_int count;
+ u_int high, low;
+
+ mtx_lock_spin(&clock_lock);
+
+ /* Select timer0 and latch counter value. */
+ outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH);
+
+ low = inb(TIMER_CNTR0);
+ high = inb(TIMER_CNTR0);
+ count = 0xffff - ((high << 8) | low);
+ mtx_unlock_spin(&clock_lock);
+ return (count);
+}
+
+static unsigned
i8254_get_timecount(struct timecounter *tc)
{
u_int count;
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