WebSVN – HelenOS-historic – Diff – /SPARTAN/trunk/arch/ia32/src/atomic.S


#
# Copyright (C) 2001-2004 Jakub Jermar
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
 
.text
 
.global atomic_inc
atomic_inc:
	pushl %ebx
	movl 8(%esp),%ebx
#ifdef __SMP__	
	lock incl (%ebx)
#else
	incl (%ebx)
#endif		
	popl %ebx
	ret
 
.global atomic_dec
atomic_dec:
	pushl %ebx
	movl 8(%esp),%ebx
#ifdef __SMP__	
	lock decl (%ebx)
#else
	decl (%ebx)
#endif
	popl %ebx
	ret
	
 
#ifdef __SMP__
 
 
.global test_and_set
.global spinlock_arch
 
test_and_set:
	pushl %ebx
    
	movl 8(%esp),%ebx
	movl $1,%eax
	xchgl %eax,(%ebx)	# xchg implicitly turns on the LOCK signal
    
	popl %ebx
	ret
 
 
#
# This is a bus-and-hyperthreading-friendly implementation of spinlock 
#
spinlock_arch:
	pushl %eax
	pushl %ebx
	
	movl 12(%esp),%ebx
 
0:	
	#ifdef __HT__
	pause			# Pentium 4's with HT love this instruction
	#endif
	movl (%ebx),%eax
	testl %eax,%eax
	jnz 0b			# lightweight looping while it is locked
	incl %eax
	xchgl %eax,(%ebx)	# now use the atomic operation
	testl %eax,%eax
	jnz 0b
 
	popl %ebx
	popl %eax
	ret
	
#endif
 

Rev 1	Rev 111
1	#	1	#
2	# Copyright (C) 2001-2004 Jakub Jermar	2	# Copyright (C) 2001-2004 Jakub Jermar
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	13	# documentation and/or other materials provided with the distribution.
14	# - The name of the author may not be used to endorse or promote products	14	# - The name of the author may not be used to endorse or promote products
15	# derived from this software without specific prior written permission.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
29	.text	29	.text
30		30
31	.global atomic_inc	31	.global atomic_inc
32	atomic_inc:	32	atomic_inc:
33	pushl %ebx	33	pushl %ebx
34	movl 8(%esp),%ebx	34	movl 8(%esp),%ebx
-		35	#ifdef __SMP__
35	lock incl (%ebx)	36	lock incl (%ebx)
-		37	#else
-		38	incl (%ebx)
-		39	#endif
36	popl %ebx	40	popl %ebx
37	ret	41	ret
38		42
39	.global atomic_dec	43	.global atomic_dec
40	atomic_dec:	44	atomic_dec:
41	pushl %ebx	45	pushl %ebx
42	movl 8(%esp),%ebx	46	movl 8(%esp),%ebx
-		47	#ifdef __SMP__
43	lock decl (%ebx)	48	lock decl (%ebx)
-		49	#else
-		50	decl (%ebx)
-		51	#endif
44	popl %ebx	52	popl %ebx
45	ret	53	ret
46		54
47		55
48	#ifdef __SMP__	56	#ifdef __SMP__
49		57
50		58
51	.global test_and_set	59	.global test_and_set
52	.global spinlock_arch	60	.global spinlock_arch
53		61
54	test_and_set:	62	test_and_set:
55	pushl %ebx	63	pushl %ebx
56		64
57	movl 8(%esp),%ebx	65	movl 8(%esp),%ebx
58	movl $1,%eax	66	movl $1,%eax
59	xchgl %eax,(%ebx) # xchg implicitly turns on the LOCK signal	67	xchgl %eax,(%ebx) # xchg implicitly turns on the LOCK signal
60		68
61	popl %ebx	69	popl %ebx
62	ret	70	ret
63		71
64		72
65	#	73	#
66	# This is a bus-and-hyperthreading-friendly implementation of spinlock	74	# This is a bus-and-hyperthreading-friendly implementation of spinlock
67	#	75	#
68	spinlock_arch:	76	spinlock_arch:
69	pushl %eax	77	pushl %eax
70	pushl %ebx	78	pushl %ebx
71		79
72	movl 12(%esp),%ebx	80	movl 12(%esp),%ebx
73		81
74	0:	82	0:
75	#ifdef __HT__	83	#ifdef __HT__
76	pause # Pentium 4's with HT love this instruction	84	pause # Pentium 4's with HT love this instruction
77	#endif	85	#endif
78	movl (%ebx),%eax	86	movl (%ebx),%eax
79	testl %eax,%eax	87	testl %eax,%eax
80	jnz 0b # lightweight looping while it is locked	88	jnz 0b # lightweight looping while it is locked
81	incl %eax	89	incl %eax
82	xchgl %eax,(%ebx) # now use the atomic operation	90	xchgl %eax,(%ebx) # now use the atomic operation
83	testl %eax,%eax	91	testl %eax,%eax
84	jnz 0b	92	jnz 0b
85		93
86	popl %ebx	94	popl %ebx
87	popl %eax	95	popl %eax
88	ret	96	ret
89		97
90	#endif	98	#endif
91		99

Subversion Repositories HelenOS-historic

(root)/SPARTAN/trunk/arch/ia32/src/atomic.S – Rev 1 → 111