xnu-1228.3.13.tar.gz

[apple/xnu.git] / osfmk / ppc / commpage / commpage_asm.s

diff --git a/osfmk/ppc/commpage/commpage_asm.s b/osfmk/ppc/commpage/commpage_asm.s
index b372b979ed5a55dc2627e17d182b9ebff9eccc61..d3ea83c249c9614beef5b5a2afe32cdd42dbc570 100644 (file)
--- a/osfmk/ppc/commpage/commpage_asm.s
+++ b/osfmk/ppc/commpage/commpage_asm.s
@@ -1,23 +1,29 @@
 /*
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 
 #include <sys/appleapiopts.h>
@@ -74,7 +80,7 @@ Ldata:
  *     ***********************************************
  *
  *     Update the gettimeofday() shared data on the commpages, as follows:
- *             _COMM_PAGE_TIMESTAMP = a BSD-style pair of uint_32's for secs and usecs
+ *             _COMM_PAGE_TIMESTAMP = the clock offset at timebase (seconds)
  *             _COMM_PAGE_TIMEBASE = the timebase at which the timestamp was valid
  *             _COMM_PAGE_SEC_PER_TICK = multiply timebase ticks by this to get seconds (double)
  *     The convention is that if the timebase is 0, the data is invalid.  Because other
@@ -94,8 +100,8 @@ Ldata:
  *     When called:
  *             r3 = upper half of timebase (timebase is disabled if 0)
  *             r4 = lower half of timebase
- *             r5 = seconds part of timestamp
- *             r6 = useconds part of timestamp
+ *             r5 = upper half of timestamp
+ *             r6 = lower half of timestamp
  *             r7 = divisor (ie, timebase ticks per sec)
  *     We set up:
  *             r8 = ptr to our static data (kkBinary0, kkDouble1, kkTicksPerSec)
@@ -106,7 +112,7 @@ Ldata:
  */
  
         .align 5
-LEXT(commpage_set_timestamp)                           // void commpage_set_timestamp(tbr,secs,usecs,divisor)
+LEXT(commpage_set_timestamp)                           // void commpage_set_timestamp(tbr,secs,divisor)
         mfmsr  r11                                                     // get MSR
         ori            r2,r11,MASK(MSR_FP)                     // turn FP on
         mtmsr  r2
@@ -155,7 +161,7 @@ LEXT(commpage_set_timestamp)                                // void commpage_set_timestamp(tbr,secs,usecs,di
         lfd            f3,kkTicksPerSec(r8)            // float new ticks_per_sec + 2**52
         lfd            f4,kkDouble1(r8)                        // f4 <- double(1.0)
         mffs   f5                                                      // save caller's FPSCR
-        mtfsfi 7,0                                                     // clear Inexeact Exception bit, set round-to-nearest
+        mtfsfi 7,1                                                     // clear Inexeact Exception bit, set round-to-zero
         fsub   f3,f3,f2                                        // get ticks_per_sec
         fdiv   f3,f4,f3                                        // divide 1 by ticks_per_sec to get SEC_PER_TICK
         stfd   f3,_COMM_PAGE_SEC_PER_TICK(r9)