The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/mchain.h

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    1 /*-
    2  * Copyright (c) 2000, 2001 Boris Popov
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *    This product includes software developed by Boris Popov.
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/5.4/sys/sys/mchain.h 145335 2005-04-20 19:11:07Z cvs2svn $
   33  */
   34 #ifndef _SYS_MCHAIN_H_
   35 #define _SYS_MCHAIN_H_
   36 
   37 #include <machine/endian.h>
   38 
   39 #ifndef _KERNEL
   40 /*
   41  * This macros probably belongs to the endian.h
   42  */
   43 #if (BYTE_ORDER == LITTLE_ENDIAN)
   44 
   45 #define htoles(x)       ((u_int16_t)(x))
   46 #define letohs(x)       ((u_int16_t)(x))
   47 #define htolel(x)       ((u_int32_t)(x))
   48 #define letohl(x)       ((u_int32_t)(x))
   49 #define htoleq(x)       ((int64_t)(x))
   50 #define letohq(x)       ((int64_t)(x))
   51 
   52 #define htobes(x)       (__htons(x))
   53 #define betohs(x)       (__ntohs(x))
   54 #define htobel(x)       (__htonl(x))
   55 #define betohl(x)       (__ntohl(x))
   56 
   57 static __inline int64_t
   58 htobeq(int64_t x)
   59 {
   60         return (int64_t)__htonl((u_int32_t)(x >> 32)) |
   61             (int64_t)__htonl((u_int32_t)(x & 0xffffffff)) << 32;
   62 }
   63 
   64 static __inline int64_t
   65 betohq(int64_t x)
   66 {
   67         return (int64_t)__ntohl((u_int32_t)(x >> 32)) |
   68             (int64_t)__ntohl((u_int32_t)(x & 0xffffffff)) << 32;
   69 }
   70 
   71 #else   /* (BYTE_ORDER == LITTLE_ENDIAN) */
   72 
   73 #error "Macros for Big-Endians are incomplete"
   74 
   75 /*
   76 #define htoles(x)       ((u_int16_t)(x))
   77 #define letohs(x)       ((u_int16_t)(x))
   78 #define htolel(x)       ((u_int32_t)(x))
   79 #define letohl(x)       ((u_int32_t)(x))
   80 */
   81 #endif  /* (BYTE_ORDER == LITTLE_ENDIAN) */
   82 #endif  /* _KERNEL */
   83 
   84 
   85 #ifdef _KERNEL
   86 
   87 /*
   88  * Type of copy for mb_{put|get}_mem()
   89  */
   90 #define MB_MSYSTEM      0               /* use bcopy() */
   91 #define MB_MUSER        1               /* use copyin()/copyout() */
   92 #define MB_MINLINE      2               /* use an inline copy loop */
   93 #define MB_MZERO        3               /* bzero(), mb_put_mem only */
   94 #define MB_MCUSTOM      4               /* use an user defined function */
   95 
   96 struct mbuf;
   97 struct mbchain;
   98 
   99 typedef int mb_copy_t(struct mbchain *mbp, c_caddr_t src, caddr_t dst, size_t len);
  100 
  101 struct mbchain {
  102         struct mbuf *   mb_top;         /* head of mbufs chain */
  103         struct mbuf *   mb_cur;         /* current mbuf */
  104         int             mb_mleft;       /* free space in the current mbuf */
  105         int             mb_count;       /* total number of bytes */
  106         mb_copy_t *     mb_copy;        /* user defined copy function */
  107         void *          mb_udata;       /* user data */
  108 };
  109 
  110 struct mdchain {
  111         struct mbuf *   md_top;         /* head of mbufs chain */
  112         struct mbuf *   md_cur;         /* current mbuf */
  113         u_char *        md_pos;         /* offset in the current mbuf */
  114 };
  115 
  116 int  mb_init(struct mbchain *mbp);
  117 void mb_initm(struct mbchain *mbp, struct mbuf *m);
  118 void mb_done(struct mbchain *mbp);
  119 struct mbuf *mb_detach(struct mbchain *mbp);
  120 int  mb_fixhdr(struct mbchain *mbp);
  121 caddr_t mb_reserve(struct mbchain *mbp, int size);
  122 
  123 int  mb_put_uint8(struct mbchain *mbp, u_int8_t x);
  124 int  mb_put_uint16be(struct mbchain *mbp, u_int16_t x);
  125 int  mb_put_uint16le(struct mbchain *mbp, u_int16_t x);
  126 int  mb_put_uint32be(struct mbchain *mbp, u_int32_t x);
  127 int  mb_put_uint32le(struct mbchain *mbp, u_int32_t x);
  128 int  mb_put_int64be(struct mbchain *mbp, int64_t x);
  129 int  mb_put_int64le(struct mbchain *mbp, int64_t x);
  130 int  mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type);
  131 int  mb_put_mbuf(struct mbchain *mbp, struct mbuf *m);
  132 int  mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size);
  133 
  134 int  md_init(struct mdchain *mdp);
  135 void md_initm(struct mdchain *mbp, struct mbuf *m);
  136 void md_done(struct mdchain *mdp);
  137 void md_append_record(struct mdchain *mdp, struct mbuf *top);
  138 int  md_next_record(struct mdchain *mdp);
  139 int  md_get_uint8(struct mdchain *mdp, u_int8_t *x);
  140 int  md_get_uint16(struct mdchain *mdp, u_int16_t *x);
  141 int  md_get_uint16le(struct mdchain *mdp, u_int16_t *x);
  142 int  md_get_uint16be(struct mdchain *mdp, u_int16_t *x);
  143 int  md_get_uint32(struct mdchain *mdp, u_int32_t *x);
  144 int  md_get_uint32be(struct mdchain *mdp, u_int32_t *x);
  145 int  md_get_uint32le(struct mdchain *mdp, u_int32_t *x);
  146 int  md_get_int64(struct mdchain *mdp, int64_t *x);
  147 int  md_get_int64be(struct mdchain *mdp, int64_t *x);
  148 int  md_get_int64le(struct mdchain *mdp, int64_t *x);
  149 int  md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type);
  150 int  md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **m);
  151 int  md_get_uio(struct mdchain *mdp, struct uio *uiop, int size);
  152 
  153 #endif  /* ifdef _KERNEL */
  154 
  155 #endif  /* !_SYS_MCHAIN_H_ */

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