1 kumpf 1.1 ;%2005////////////////////////////////////////////////////////////////////////
 2           ;
 3           ; Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
 4           ; Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
 5           ; Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
 6           ; IBM Corp.; EMC Corporation, The Open Group.
 7           ; Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
 8           ; IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
 9           ; Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
10           ; EMC Corporation; VERITAS Software Corporation; The Open Group.
11           ;
12           ; Permission is hereby granted, free of charge, to any person obtaining a copy
13           ; of this software and associated documentation files (the "Software"), to
14           ; deal in the Software without restriction, including without limitation the
15           ; rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
16           ; sell copies of the Software, and to permit persons to whom the Software is
17           ; furnished to do so, subject to the following conditions:
18           ; 
19           ; THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
20           ; ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
21           ; "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
22 kumpf 1.1 ; LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
23           ; PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
24           ; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25           ; ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26           ; WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27           ;
28           ;==============================================================================
29           ;
30           ; Author: Roger Kumpf, Hewlett-Packard Company (roger_kumpf@hp.com)
31           ;
32           ;%/////////////////////////////////////////////////////////////////////////////
33           
34           ;
35           ; LoadAndClearWord_HPUX_PARISC_ACC.s:
36           ; HP-UX PA-RISC assembly language routine for spinlock support.
37           ;
38           
39               .code
40           #ifdef __LP64__
41               .level 2.0W
42           #else
43 kumpf 1.1     .level 1.1
44           #endif
45               .export LoadAndClearWord,entry,priv_lev=3,rtnval=gr
46               .proc
47           
48           LoadAndClearWord
49               .callinfo no_calls
50               .enter
51           
52           ; create a 16 byte aligned pointer to the load+clear word area
53               addi        15,%arg0,%arg2  ; add 15 to the pointer to round up
54           
55           #ifdef __LP64__
56               depdi       0,63,4,%arg2    ; mask the lower 4 bits (64-bit)
57           #else
58               depi        0,31,4,%arg2    ; mask the lower 4 bits (32-bit)
59           #endif
60           
61           #ifdef __LP64__
62               bve       (%r2)          ; return 0 if already locked, else !0
63           #else
64 kumpf 1.1     bv        (%r2)          ; return 0 if already locked, else !0
65           #endif
66               ldcws,co  (%arg2),%ret0  ; (in branch delay slot)
67                                   ; load and clear (coherent) the spinlock word
68           
69           ; This code is never executed.  This endless loop reduces the
70           ; prefetching after mispredicted bv on pre PA 8700 processors.
71           ; Leave this dead code here to improve performance.
72           
73           load_and_clear_loop
74                 b load_and_clear_loop
75                 nop
76                .leave
77                .procend