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Diffstat (limited to 'cpu/i386/timer.c')
-rw-r--r--cpu/i386/timer.c50
1 files changed, 25 insertions, 25 deletions
diff --git a/cpu/i386/timer.c b/cpu/i386/timer.c
index a23cd6e..486d927 100644
--- a/cpu/i386/timer.c
+++ b/cpu/i386/timer.c
@@ -46,28 +46,28 @@ unsigned long get_system_ticks(void)
int timer_init(void)
{
system_ticks = 0;
-
+
irq_install_handler(0, timer_isr, NULL);
-
- /* initialize timer 0 and 2
- *
+
+ /* initialize timer 0 and 2
+ *
* Timer 0 is used to increment system_tick 1000 times/sec
* Timer 1 was used for DRAM refresh in early PC's
* Timer 2 is used to drive the speaker
* (to stasrt a beep: write 3 to port 0x61,
* to stop it again: write 0)
*/
-
- outb(PIT_CMD_CTR0|PIT_CMD_BOTH|PIT_CMD_MODE2, PIT_BASE + PIT_COMMAND);
+
+ outb(PIT_CMD_CTR0|PIT_CMD_BOTH|PIT_CMD_MODE2, PIT_BASE + PIT_COMMAND);
outb(TIMER0_VALUE&0xff, PIT_BASE + PIT_T0);
outb(TIMER0_VALUE>>8, PIT_BASE + PIT_T0);
- outb(PIT_CMD_CTR2|PIT_CMD_BOTH|PIT_CMD_MODE3, PIT_BASE + PIT_COMMAND);
+ outb(PIT_CMD_CTR2|PIT_CMD_BOTH|PIT_CMD_MODE3, PIT_BASE + PIT_COMMAND);
outb(TIMER2_VALUE&0xff, PIT_BASE + PIT_T2);
outb(TIMER2_VALUE>>8, PIT_BASE + PIT_T2);
timer_init_done = 1;
-
+
return 0;
}
@@ -87,7 +87,7 @@ ulong get_timer (ulong base)
return (system_ticks - base);
}
-void set_timer (ulong t)
+void set_timer (ulong t)
{
system_ticks = t;
}
@@ -102,20 +102,20 @@ static u16 read_pit(void)
/* this is not very exact */
void udelay (unsigned long usec)
-{
+{
int counter;
int wraps;
-
+
if (!timer_init_done) {
return;
}
counter = read_pit();
wraps = usec/1000;
usec = usec%1000;
-
+
usec*=1194;
usec/=1000;
- usec+=counter;
+ usec+=counter;
if (usec > 1194) {
usec-=1194;
wraps++;
@@ -123,26 +123,26 @@ void udelay (unsigned long usec)
while (1) {
int new_count = read_pit();
-
+
if (((new_count < usec) && !wraps) || wraps < 0) {
break;
}
-
+
if (new_count > counter) {
wraps--;
}
counter = new_count;
}
-
+
}
#if 0
/* this is a version with debug output */
void _udelay (unsigned long usec)
-{
+{
int counter;
int wraps;
-
+
int usec1, usec2, usec3;
int wraps1, wraps2, wraps3, wraps4;
int ctr1, ctr2, ctr3, nct1, nct2;
@@ -155,13 +155,13 @@ void _udelay (unsigned long usec)
ctr1 = counter;
wraps = usec/1000;
usec = usec%1000;
-
+
usec2 = usec;
wraps1 = wraps;
-
+
usec*=1194;
usec/=1000;
- usec+=counter;
+ usec+=counter;
if (usec > 1194) {
usec-=1194;
wraps++;
@@ -169,7 +169,7 @@ void _udelay (unsigned long usec)
usec3 = usec;
wraps2 = wraps;
-
+
ctr2 = wraps3 = nct1 = 4711;
ctr3 = wraps4 = nct2 = 4711;
i=0;
@@ -179,7 +179,7 @@ void _udelay (unsigned long usec)
if ((new_count < usec && !wraps) || wraps < 0) {
break;
}
-
+
if (new_count > counter) {
wraps--;
}
@@ -192,10 +192,10 @@ void _udelay (unsigned long usec)
wraps4 = wraps;
nct2 = new_count;
}
-
+
counter = new_count;
}
-
+
printf("udelay(%d)\n", usec1);
printf("counter %d\n", ctr1);
printf("1: wraps %d, usec %d\n", wraps1, usec2);