xnu-792.12.6.tar.gz

[apple/xnu.git] / osfmk / i386 / commpage / commpage_gettimeofday.s

diff --git a/osfmk/i386/commpage/commpage_gettimeofday.s b/osfmk/i386/commpage/commpage_gettimeofday.s
index 55bfd27bab4b10879c91edadf2f896132edda863..782ec8e2eee063aae734519eb020f5f4a7a5a723 100644 (file)
--- a/osfmk/i386/commpage/commpage_gettimeofday.s
+++ b/osfmk/i386/commpage/commpage_gettimeofday.s
@@ -1,129 +1,42 @@
 /*
 /*

- * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_LICENSE_OSREFERENCE_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 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.
- * 
- * @APPLE_LICENSE_HEADER_END@
+ * 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.
+ *
+ * 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
+ * Please see the License for the specific language governing rights and 
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_OSREFERENCE_HEADER_END@

  */
 
 #include <sys/appleapiopts.h>
 #include <machine/cpu_capabilities.h>
 #include <machine/commpage.h>
 
  */
 
 #include <sys/appleapiopts.h>
 #include <machine/cpu_capabilities.h>
 #include <machine/commpage.h>
 

-#define NSEC_PER_SEC   1000*1000*1000
-#define NSEC_PER_USEC  1000
-

         .text
         .align  2, 0x90
 
 Lgettimeofday:
         .text
         .align  2, 0x90
 
 Lgettimeofday:

-       push    %ebp
-       mov     %esp,%ebp
-       push    %esi
-       push    %edi
-       push    %ebx
-
-0:
-       cmp     $0,_COMM_PAGE_TIMEENABLE
-       je      4f
-       mov     _COMM_PAGE_TIMEBASE,%esi
-       mov     _COMM_PAGE_TIMEBASE+4,%edi
-       mov     _COMM_PAGE_TIMESTAMP,%ebx
-
-       mov     $ _COMM_PAGE_NANOTIME,%eax
-       call    *%eax           /* get ns in %edx:%eax */
-
-       cmp     _COMM_PAGE_TIMEBASE,%esi
-       jne     0b
-       cmp     _COMM_PAGE_TIMEBASE+4,%edi
-       jne     0b
-       cmp     $0,_COMM_PAGE_TIMEENABLE
-       je      4f
-       
-       mov     $ NSEC_PER_SEC,%ecx
-       sub     %esi,%eax
-       sbb     %edi,%edx
-       div     %ecx
-       add     %eax,%ebx
-
-       mov     $ NSEC_PER_USEC,%ecx
-       mov     %edx,%eax
-       xor     %edx,%edx
-       div     %ecx
-
-       mov     8(%ebp),%ecx
-       mov     %ebx,(%ecx)
-       mov     %eax,4(%ecx)
-       xor     %eax,%eax
-
-3:
-       pop     %ebx
-       pop     %edi
-       pop     %esi
-       pop     %ebp
+       int     $0x3

        ret
        ret

-4:                             /* fail */
-       movl    $1,%eax
-       jmp     3b

 
        COMMPAGE_DESCRIPTOR(gettimeofday,_COMM_PAGE_GETTIMEOFDAY,0,0)
 
        COMMPAGE_DESCRIPTOR(gettimeofday,_COMM_PAGE_GETTIMEOFDAY,0,0)

-
-
-       .code64
-        .text
-        .align  2, 0x90
-
-Lgettimeofday_64:                      // %rdi = ptr to timeval
-       pushq   %rbp                    // set up a frame for backtraces
-       movq    %rsp,%rbp
-       movq    %rdi,%r9                // save ptr to timeval
-       movq    $_COMM_PAGE_32_TO_64(_COMM_PAGE_TIMEBASE),%r10
-0:
-       cmpl    $0,_TIMEENABLE(%r10)    // is data valid? (test _COMM_PAGE_TIMEENABLE)
-       jz      4f                      // no
-       movq    _TIMEBASE(%r10),%r11    // get _COMM_PAGE_TIMEBASE
-       movq    $_COMM_PAGE_32_TO_64(_COMM_PAGE_NANOTIME),%rax
-       call    *%rax                   // get %rax <- nanotime(), preserving %r9, %r10 and %r11
-       movl    _TIMESTAMP(%r10),%r8d   // get _COMM_PAGE_TIMESTAMP
-       cmpq    _TIMEBASE(%r10),%r11    // has _COMM_PAGE_TIMEBASE changed?
-       jne     0b                      // loop until we have consistent data
-       cmpl    $0,_TIMEENABLE(%r10)    // is data valid? (test _COMM_PAGE_TIMEENABLE)
-       jz      4f                      // no
-       
-       movl    $ NSEC_PER_SEC,%ecx
-       subq    %r11,%rax               // generate nanoseconds since timestamp
-       movq    %rax,%rdx
-       shrq    $32,%rdx                // get high half of delta in %edx
-       divl    %ecx                    // %eax <- seconds since timestamp, %edx <- nanoseconds
-       addl    %eax,%r8d               // add seconds elapsed to timestamp seconds
-
-       movl    $ NSEC_PER_USEC,%ecx
-       movl    %edx,%eax
-       xorl    %edx,%edx
-       divl    %ecx                    // divide residual ns by 1000 to get residual us in %eax
-       
-       movq    %r8,(%r9)               // store 64-bit seconds into timeval
-       movl    %eax,8(%r9)             // store 32-bit useconds into timeval
-       xorl    %eax,%eax               // return 0 for success
-3:
-       popq    %rbp
-       ret
-4:                                     // fail
-       movl    $1,%eax
-       jmp     3b
-
-       COMMPAGE_DESCRIPTOR(gettimeofday_64,_COMM_PAGE_GETTIMEOFDAY,0,0)