/*
- * 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@
*/
#define ASSEMBLER
#include <machine/cpu_capabilities.h>
#include <machine/commpage.h>
-#define USEC_PER_SEC 1000000
-
-
/* The red zone is used to move data between GPRs and FPRs: */
#define rzTicks -8 // elapsed ticks since timestamp (double)
.text
.align 2
- .globl EXT(gettimeofday_32)
- .globl EXT(gettimeofday_64)
// *********************************
// in user mode, usually without having to make a system call. We do not deal with
// the timezone. The kernel maintains the following values in the comm page:
//
-// _COMM_PAGE_TIMESTAMP = a BSD-style pair of uint_32's for seconds and microseconds
+// _COMM_PAGE_TIMESTAMP = 64 bit seconds timestamp
//
// _COMM_PAGE_TIMEBASE = the timebase at which the timestamp was valid
//
//
// r3 = ptr to user's timeval structure (should not be null)
-gettimeofday_32: // int gettimeofday_32(timeval *tp);
+gettimeofday_32: // int gettimeofday(timeval *tp);
0:
lwz r5,_COMM_PAGE_TIMEBASE+0(0) // r5,r6 = TBR at timestamp
lwz r6,_COMM_PAGE_TIMEBASE+4(0)
- lwz r7,_COMM_PAGE_TIMESTAMP+0(0) // r7 = timestamp seconds
- lwz r8,_COMM_PAGE_TIMESTAMP+4(0) // r8 = timestamp microseconds
+ lwz r8,_COMM_PAGE_TIMESTAMP+4(0) // r8 = timestamp 32 bit seconds
lfd f1,_COMM_PAGE_SEC_PER_TICK(0)
1:
mftbu r10 // r10,r11 = current timebase
lwz r0,_COMM_PAGE_TIMEBASE+0(0) // then load data a 2nd time
lwz r12,_COMM_PAGE_TIMEBASE+4(0)
- lwz r2,_COMM_PAGE_TIMESTAMP+0(0)
lwz r9,_COMM_PAGE_TIMESTAMP+4(0)
cmplw cr6,r5,r0 // did we read a consistent set?
cmplw cr7,r6,r12
beq- 3f // timestamp is disabled so return bad status
- cmplw cr1,r2,r7
cmplw cr5,r9,r8
crand cr0_eq,cr6_eq,cr7_eq
- crand cr1_eq,cr1_eq,cr5_eq
- crand cr0_eq,cr0_eq,cr1_eq
+ crand cr0_eq,cr0_eq,cr5_eq
bne- 0b // loop until we have a consistent set of data
subfc r11,r6,r11 // compute ticks since timestamp
lwz r9,_COMM_PAGE_2_TO_52(0) // get exponent for (2**52)
subfe r10,r5,r10 // complete 64-bit subtract
- lfd f2,_COMM_PAGE_2_TO_52(0) // f3 <- (2**52)
+ lfd f2,_COMM_PAGE_2_TO_52(0) // f2 <- (2**52)
srwi. r0,r10,2 // if more than 2**34 ticks have elapsed...
stw r11,rzTicks+4(r1) // store elapsed ticks into red zone
or r10,r10,r9 // convert long-long in (r10,r11) into double
bne- 3f // ...call kernel to reprime timestamp
stw r10,rzTicks(r1) // complete double
- lis r12,hi16(USEC_PER_SEC)
- ori r12,r12,lo16(USEC_PER_SEC)
-
+
+ mffs f7
+ mtfsfi 7,1
lfd f3,rzTicks(r1) // get elapsed ticks since timestamp + 2**52
fsub f4,f3,f2 // subtract 2**52 and normalize
fmul f5,f4,f1 // f5 <- elapsed seconds since timestamp
fmul f6,f6,f3 // f6 <- fractional elapsed useconds
fctiwz f6,f6 // convert useconds to integer
stfd f6,rzUSeconds(r1) // store useconds into red zone
+ mtfsf 0xff,f7
lwz r5,rzSeconds+4(r1) // r5 <- seconds since timestamp
- lwz r6,rzUSeconds+4(r1) // r6 <- useconds since timestamp
- add r7,r7,r5 // add elapsed seconds to timestamp seconds
- add r8,r8,r6 // ditto useconds
+ lwz r7,rzUSeconds+4(r1) // r7 <- useconds since timestamp
+ add r6,r8,r5 // add elapsed seconds to timestamp seconds
- cmplw r8,r12 // r8 >= USEC_PER_SEC ?
- blt 2f // no
- addi r7,r7,1 // add 1 to secs
- sub r8,r8,r12 // subtract USEC_PER_SEC from usecs
-2:
- stw r7,0(r3) // store secs//usecs into user's timeval
- stw r8,4(r3)
+ stw r6,0(r3) // store secs//usecs into user's timeval
+ stw r7,4(r3)
li r3,0 // return success
blr
3: // too long since last timestamp or this code is disabled
li r3,1 // return bad status so our caller will make syscall
blr
- COMMPAGE_DESCRIPTOR(gettimeofday_32,_COMM_PAGE_GETTIMEOFDAY,0,k64Bit,kCommPageSYNC)
+ COMMPAGE_DESCRIPTOR(gettimeofday_32,_COMM_PAGE_GETTIMEOFDAY,0,k64Bit,kCommPageSYNC+kCommPage32)
-// *********************************
-// * G E T T I M E O F D A Y _ 6 4 *
-// *********************************
+// ***************************************
+// * G E T T I M E O F D A Y _ G 5 _ 3 2 *
+// ***************************************
+//
+// This routine is called in 32-bit mode on 64-bit processors. A timeval is a struct of
+// a long seconds and int useconds, so its size depends on mode.
+
+gettimeofday_g5_32: // int gettimeofday(timeval *tp);
+0:
+ ld r6,_COMM_PAGE_TIMEBASE(0) // r6 = TBR at timestamp
+ ld r8,_COMM_PAGE_TIMESTAMP(0) // r8 = timestamp (seconds)
+ lfd f1,_COMM_PAGE_SEC_PER_TICK(0)
+ mftb r10 // r10 = get current timebase
+ lwsync // create a barrier if MP (patched to NOP if UP)
+ ld r11,_COMM_PAGE_TIMEBASE(0) // then get data a 2nd time
+ ld r12,_COMM_PAGE_TIMESTAMP(0)
+ cmpdi cr1,r6,0 // is the timestamp disabled?
+ cmpld cr6,r6,r11 // did we read a consistent set?
+ cmpld cr7,r8,r12
+ beq-- cr1,3f // exit if timestamp disabled
+ crand cr6_eq,cr7_eq,cr6_eq
+ sub r11,r10,r6 // compute elapsed ticks from timestamp
+ bne-- cr6,0b // loop until we have a consistent set of data
+
+ srdi. r0,r11,35 // has it been more than 2**35 ticks since last timestamp?
+ std r11,rzTicks(r1) // put ticks in redzone where we can "lfd" it
+ bne-- 3f // timestamp too old, so reprime
+
+ mffs f7
+ mtfsfi 7,1
+ lfd f3,rzTicks(r1) // get elapsed ticks since timestamp (fixed pt)
+ fcfid f4,f3 // float the tick count
+ fmul f5,f4,f1 // f5 <- elapsed seconds since timestamp
+ lfd f3,_COMM_PAGE_10_TO_6(0) // get 10**6
+ fctidz f6,f5 // convert integer seconds to fixed pt
+ stfd f6,rzSeconds(r1) // save fixed pt integer seconds in red zone
+ fcfid f6,f6 // float the integer seconds
+ fsub f6,f5,f6 // f6 <- fractional part of elapsed seconds
+ fmul f6,f6,f3 // f6 <- fractional elapsed useconds
+ fctidz f6,f6 // convert useconds to fixed pt integer
+ stfd f6,rzUSeconds(r1) // store useconds into red zone
+ mtfsf 0xff,f7
+
+ lwz r5,rzSeconds+4(r1) // r5 <- seconds since timestamp
+ lwz r7,rzUSeconds+4(r1) // r7 <- useconds since timestamp
+ add r6,r8,r5 // add elapsed seconds to timestamp seconds
+
+ stw r6,0(r3) // store secs//usecs into user's timeval
+ stw r7,4(r3)
+ li r3,0 // return success
+ blr
+3: // too long since last timestamp or this code is disabled
+ li r3,1 // return bad status so our caller will make syscall
+ blr
+
+ COMMPAGE_DESCRIPTOR(gettimeofday_g5_32,_COMM_PAGE_GETTIMEOFDAY,k64Bit,0,kCommPageSYNC+kCommPage32)
+
+
+// ***************************************
+// * G E T T I M E O F D A Y _ G 5 _ 6 4 *
+// ***************************************
+//
+// This routine is called in 64-bit mode on 64-bit processors. A timeval is a struct of
+// a long seconds and int useconds, so its size depends on mode.
-gettimeofday_64: // int gettimeofday_64(timeval *tp);
+gettimeofday_g5_64: // int gettimeofday(timeval *tp);
0:
ld r6,_COMM_PAGE_TIMEBASE(0) // r6 = TBR at timestamp
- ld r8,_COMM_PAGE_TIMESTAMP(0) // r8 = timestamp (seconds,useconds)
+ ld r8,_COMM_PAGE_TIMESTAMP(0) // r8 = timestamp (seconds)
lfd f1,_COMM_PAGE_SEC_PER_TICK(0)
mftb r10 // r10 = get current timebase
lwsync // create a barrier if MP (patched to NOP if UP)
std r11,rzTicks(r1) // put ticks in redzone where we can "lfd" it
bne-- 3f // timestamp too old, so reprime
+ mffs f7
+ mtfsfi 7,1
lfd f3,rzTicks(r1) // get elapsed ticks since timestamp (fixed pt)
fcfid f4,f3 // float the tick count
fmul f5,f4,f1 // f5 <- elapsed seconds since timestamp
fmul f6,f6,f3 // f6 <- fractional elapsed useconds
fctidz f6,f6 // convert useconds to fixed pt integer
stfd f6,rzUSeconds(r1) // store useconds into red zone
+ mtfsf 0xff,f7
- lis r12,hi16(USEC_PER_SEC) // r12 <- 10**6
- srdi r7,r8,32 // extract seconds from doubleword timestamp
lwz r5,rzSeconds+4(r1) // r5 <- seconds since timestamp
- ori r12,r12,lo16(USEC_PER_SEC)
- lwz r6,rzUSeconds+4(r1) // r6 <- useconds since timestamp
- add r7,r7,r5 // add elapsed seconds to timestamp seconds
- add r8,r8,r6 // ditto useconds
+ lwz r7,rzUSeconds+4(r1) // r7 <- useconds since timestamp
+ add r6,r8,r5 // add elapsed seconds to timestamp seconds
- cmplw r8,r12 // r8 >= USEC_PER_SEC ?
- blt 2f // no
- addi r7,r7,1 // add 1 to secs
- sub r8,r8,r12 // subtract USEC_PER_SEC from usecs
-2:
- stw r7,0(r3) // store secs//usecs into user's timeval
- stw r8,4(r3)
+ std r6,0(r3) // store secs//usecs into user's timeval
+ stw r7,8(r3)
li r3,0 // return success
blr
3: // too long since last timestamp or this code is disabled
li r3,1 // return bad status so our caller will make syscall
blr
- COMMPAGE_DESCRIPTOR(gettimeofday_64,_COMM_PAGE_GETTIMEOFDAY,k64Bit,0,kCommPageSYNC)
+ COMMPAGE_DESCRIPTOR(gettimeofday_g5_64,_COMM_PAGE_GETTIMEOFDAY,k64Bit,0,kCommPageSYNC+kCommPage64)
projects / apple / xnu.git / blobdiff