/*
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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.
+ *
+ * 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
* 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>
* * C O M M P A G E _ S E T _ T I M E S T A M P *
* ***********************************************
*
- * Update the gettimeofday() shared data on the commpage, as follows:
- * _COMM_PAGE_TIMESTAMP = a BSD-style pair of uint_32's for secs and usecs
+ * Update the gettimeofday() shared data on the commpages, as follows:
+ * _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
* 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)
- * r9 = ptr to comm page in kernel map
+ * r9 = ptr to 32-bit commpage in kernel map
+ * r10 = ptr to 64-bit commpage in kernel map
*
* --> Interrupts must be disabled and rtclock locked when called. <--
*/
.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
or. r0,r3,r4 // is timebase 0? (thus disabled)
lis r8,hi16(Ldata) // point to our data
- lis r9,ha16(EXT(commPagePtr)) // get ptr to address of commpage in kernel map
+ lis r9,ha16(EXT(commPagePtr32)) // get ptrs to address of commpages in kernel map
+ lis r10,ha16(EXT(commPagePtr64))
stfd f1,rzSaveF1(r1) // save a FPR in the red zone
ori r8,r8,lo16(Ldata)
- lwz r9,lo16(EXT(commPagePtr))(r9) // r9 <- commPagePtr
+ lwz r9,lo16(EXT(commPagePtr32))(r9) // r9 <- 32-bit commpage ptr
+ lwz r10,lo16(EXT(commPagePtr64))(r10) // r10 <- 64-bit commpage ptr
lfd f1,kkBinary0(r8) // get fixed 0s
li r0,_COMM_PAGE_BASE_ADDRESS // get va in user space of commpage
- cmpwi cr1,r9,0 // is commpage allocated yet?
- sub r9,r9,r0 // r9 <- commpage address, biased by user va
- beq-- cr1,3f // skip if not allocated
- stfd f1,_COMM_PAGE_TIMEBASE(r9) // turn off the timestamp (atomically)
+ cmpwi cr1,r9,0 // is 32-bit commpage allocated yet?
+ cmpwi cr6,r10,0 // is 64-bit commpage allocated yet?
+ sub r9,r9,r0 // r9 <- 32-bit commpage address, biased by user va
+ sub r10,r10,r0 // r10<- 64-bit commpage address
+ beq-- cr1,3f // skip if 32-bit commpage not allocated (64-bit won't be either)
+ bne++ cr6,1f // skip if 64-bit commpage is allocated
+ mr r10,r9 // if no 64-bit commpage, point to 32-bit version with r10 too
+1:
+ stfd f1,_COMM_PAGE_TIMEBASE(r9) // turn off the 32-bit-commpage timestamp (atomically)
+ stfd f1,_COMM_PAGE_TIMEBASE(r10) // and the 64-bit one too
eieio // make sure all CPUs see it is off
beq 3f // all we had to do is turn off timestamp
stw r3,rzNewTimeBase(r1) // store new timebase so we can lfd
stw r4,rzNewTimeBase+4(r1)
cmpw r0,r7 // do we need to recompute _COMM_PAGE_SEC_PER_TICK?
- stw r5,_COMM_PAGE_TIMESTAMP(r9) // store the new timestamp
+ stw r5,_COMM_PAGE_TIMESTAMP(r9) // store the new timestamp in the 32-bit page
stw r6,_COMM_PAGE_TIMESTAMP+4(r9)
+ stw r5,_COMM_PAGE_TIMESTAMP(r10)// and the 64-bit commpage
+ stw r6,_COMM_PAGE_TIMESTAMP+4(r10)
lfd f1,rzNewTimeBase(r1) // get timebase in a FPR so we can store atomically
beq++ 2f // same ticks_per_sec, no need to recompute
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)
+ stfd f3,_COMM_PAGE_SEC_PER_TICK(r10)
mtfsf 0xFF,f5 // restore FPSCR
lfd f2,rzSaveF2(r1) // restore FPRs
lfd f3,rzSaveF3(r1)
2: // f1 == new timestamp
eieio // wait until the stores take
stfd f1,_COMM_PAGE_TIMEBASE(r9) // then turn the timestamp back on (atomically)
+ stfd f1,_COMM_PAGE_TIMEBASE(r10) // both
3: // here once all fields updated
lfd f1,rzSaveF1(r1) // restore last FPR
mtmsr r11 // turn FP back off
projects / apple / xnu.git / blobdiff