1 karl  1.2 ;%2006////////////////////////////////////////////////////////////////////////

 2 kumpf 1.1 ;
 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 karl  1.2 ; Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
12           ; EMC Corporation; Symantec Corporation; The Open Group.

13 kumpf 1.1 ;
14           ; Permission is hereby granted, free of charge, to any person obtaining a copy
15           ; of this software and associated documentation files (the "Software"), to
16           ; deal in the Software without restriction, including without limitation the
17           ; rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
18           ; sell copies of the Software, and to permit persons to whom the Software is
19           ; furnished to do so, subject to the following conditions:

20 karl  1.2 ;  

21 kumpf 1.1 ; THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
22           ; ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
23           ; "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
24           ; LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
25           ; PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
26           ; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
27           ; ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28           ; WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
29           ;
30           ;==============================================================================
31           ;
32           ; Author: Roger Kumpf, Hewlett-Packard Company (roger_kumpf@hp.com)
33           ;
34           ;%/////////////////////////////////////////////////////////////////////////////
35           
36           ;
37           ; LoadAndClearWord_HPUX_PARISC_ACC.s:
38           ; HP-UX PA-RISC assembly language routine for spinlock support.
39           ;
40           
41               .code
42 kumpf 1.1 #ifdef __LP64__
43               .level 2.0W
44           #else
45               .level 1.1
46           #endif
47               .export LoadAndClearWord,entry,priv_lev=3,rtnval=gr
48               .proc
49           
50           LoadAndClearWord
51               .callinfo no_calls
52               .enter
53           
54           ; create a 16 byte aligned pointer to the load+clear word area
55               addi        15,%arg0,%arg2  ; add 15 to the pointer to round up
56           
57           #ifdef __LP64__
58               depdi       0,63,4,%arg2    ; mask the lower 4 bits (64-bit)
59           #else
60               depi        0,31,4,%arg2    ; mask the lower 4 bits (32-bit)
61           #endif
62           
63 kumpf 1.1 #ifdef __LP64__
64               bve       (%r2)          ; return 0 if already locked, else !0
65           #else
66               bv        (%r2)          ; return 0 if already locked, else !0
67           #endif
68               ldcws,co  (%arg2),%ret0  ; (in branch delay slot)
69                                   ; load and clear (coherent) the spinlock word
70           
71           ; This code is never executed.  This endless loop reduces the
72           ; prefetching after mispredicted bv on pre PA 8700 processors.
73           ; Leave this dead code here to improve performance.
74           
75           load_and_clear_loop
76                 b load_and_clear_loop
77                 nop
78                .leave
79                .procend