xv6

commit 6861140a667cd7219cf9bc1e051faadfc8c46c6f
parent 3d145283a25ed9dcd8e0544e3db9d6733ab7d8b7
Author: rsc <rsc>
Date:   Fri, 10 Aug 2007 17:05:46 +0000

replace bogus loops with slightly less bogus loops.

Diffstat:
M
lapic.c
 | 
8
+++-----

1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/lapic.c b/lapic.c
@@ -201,17 +201,15 @@ lapic_startap(uchar apicid, int v)
   lapic_write(LAPIC_ICRHI, crhi);
   lapic_write(LAPIC_ICRLO, LAPIC_FIELD|APIC_LEVEL|
                            LAPIC_ASSERT|APIC_INIT);
-
-  while(j++ < 10000) {;}
+  for(j=0; j<10000; j++);  // 200us
   lapic_write(LAPIC_ICRLO, LAPIC_FIELD|APIC_LEVEL|
                            LAPIC_DEASSERT|APIC_INIT);
-
-  while(j++ < 1000000) {;}
+  for(j=0; j<1000000; j++);  // 10ms
 
   // in p9 code, this was i < 2, which is what the spec says on page B-3
   for(i = 0; i < 1; i++){
     lapic_write(LAPIC_ICRHI, crhi);
     lapic_write(LAPIC_ICRLO, LAPIC_FIELD|APIC_EDGE|APIC_STARTUP|(v/4096));
-    while(j++ < 100000) {;}
+    for(j=0; j<10000; j++);  // 200us
   }
 }