usr/src/uts/intel/asm/bitmap.h

   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 2005 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
  26  */
  27
  28 #ifndef _ASM_BITMAP_H
  29 #define _ASM_BITMAP_H
  30
  31 #include <sys/ccompile.h>
  32 #include <sys/types.h>
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38
  39 #if defined(__amd64)
  40 #define __SUF   "q"
  41 #elif defined(__i386)
  42 #define __SUF   "l"
  43 #else
  44 #error "port me"
  45 #endif
  46
  47 extern __GNU_INLINE int
  48 highbit(ulong_t i)
  49 {
  50         long value;
  51         uint8_t zf;
  52
  53         __asm__(
  54             "bsr" __SUF " %2,%0;"
  55             "setz %1"
  56             : "=r" (value), "=q" (zf)
  57             : "mr" (i)
  58             : "cc");
  59
  60         return (zf ? 0 : (value + 1));
  61 }
  62
  63 extern __GNU_INLINE int
  64 lowbit(ulong_t i)
  65 {
  66         long value;
  67         uint8_t zf;
  68
  69         __asm__(
  70             "bsf" __SUF " %2,%0;"
  71             "setz %1"
  72             : "=r" (value), "=q" (zf)
  73             : "mr" (i)
  74             : "cc");
  75
  76         return (zf ? 0 : (value + 1));
  77 }
  78
  79 extern __GNU_INLINE uint_t
  80 atomic_btr32(uint32_t *memory, uint_t bitnum)
  81 {
  82         uint8_t value;
  83
  84         __asm__ __volatile__(
  85             "lock;"
  86             "btrl %2,%0;"
  87             "setc %1"
  88             : "+m" (*memory), "=r" (value)
  89             : "ir" (bitnum)
  90             : "cc");
  91
  92         return ((uint_t)value);
  93 }
  94
  95 #undef __SUF
  96
  97
  98 #ifdef  __cplusplus
  99 }
 100 #endif
 101
 102 #endif  /* _ASM_BITMAP_H */