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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31 
  32 #include <sys/types.h>
  33 #include <sys/atomic.h>
  34 
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38 
  39 #define PIO_LIMIT_ENTER(p)      { \
  40                                 int n;\
  41                                 for (;;) {\
  42                                         do {\
  43                                                 n = p->pbm_pio_counter;\
  44                                         } while (n <= 0);\
  45                                         if (atomic_add_32_nv(\
  46                                             (uint_t *)&p->pbm_pio_counter, -1)\
  47                                             == (n - 1))\
  48                                                 break;\
  49                                         atomic_add_32(\
  50                                             (uint_t *)&p->pbm_pio_counter, 1);\
  51                                 }\
  52                                 }
  53 
  54 
  55 
  56 #define PIO_LIMIT_EXIT(p)       atomic_add_32((uint_t *)&p->pbm_pio_counter, 1);
  57 
  58 extern void pci_axq_setup(ddi_map_req_t *mp, pbm_t *pbm_p);
  59 extern void pci_axq_pio_limit(pbm_t *pbm_p);
  60 
  61 #ifdef  __cplusplus
  62 }
  63 #endif
  64 
  65 #endif  /* _SYS_PCI_AXQ_H */