xref: /titanic_44/usr/src/uts/sun4u/sys/pci/pci_axq.h (revision 48a4016cae8aa2b8b3d8b258eb22e0c781912bed)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright (c) 2001 by Sun Microsystems, Inc.
24  * All rights reserved.
25  */
26 
27 #ifndef	_SYS_PCI_AXQ_H
28 #define	_SYS_PCI_AXQ_H
29 
30 #include <sys/types.h>
31 #include <sys/atomic.h>
32 
33 #ifdef	__cplusplus
34 extern "C" {
35 #endif
36 
37 #define	PIO_LIMIT_ENTER(p)	{ \
38 				int n;\
39 				for (;;) {\
40 					do {\
41 						n = p->pbm_pio_counter;\
42 					} while (n <= 0);\
43 					if (atomic_dec_32_nv(\
44 					    (uint_t *)&p->pbm_pio_counter)\
45 					    == (n - 1))\
46 						break;\
47 					atomic_inc_32(\
48 					    (uint_t *)&p->pbm_pio_counter);\
49 				}\
50 				}
51 
52 
53 
54 #define	PIO_LIMIT_EXIT(p)	atomic_inc_32((uint_t *)&p->pbm_pio_counter);
55 
56 extern void pci_axq_setup(ddi_map_req_t *mp, pbm_t *pbm_p);
57 extern void pci_axq_pio_limit(pbm_t *pbm_p);
58 
59 #ifdef	__cplusplus
60 }
61 #endif
62 
63 #endif	/* _SYS_PCI_AXQ_H */
64