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  * $FreeBSD$
   33  */
   34 #ifndef _SYS_MCHAIN_H_
   35 #define _SYS_MCHAIN_H_
   36 
   37 #include <machine/endian.h>
   38 
   39 /*
   40  * This macros probably belongs to the endian.h
   41  */
   42 #if (BYTE_ORDER == LITTLE_ENDIAN)
   43 
   44 #define htoles(x)       ((u_int16_t)(x))
   45 #define letohs(x)       ((u_int16_t)(x))
   46 #define htolel(x)       ((u_int32_t)(x))
   47 #define letohl(x)       ((u_int32_t)(x))
   48 #define htoleq(x)       ((int64_t)(x))
   49 #define letohq(x)       ((int64_t)(x))
   50 
   51 #define htobes(x)       (htons(x))
   52 #define betohs(x)       (ntohs(x))
   53 #define htobel(x)       (htonl(x))
   54 #define betohl(x)       (ntohl(x))
   55 
   56 static __inline int64_t
   57 htobeq(int64_t x)
   58 {
   59         return (int64_t)htonl((u_int32_t)(x >> 32)) |
   60             (int64_t)htonl((u_int32_t)(x & 0xffffffff)) << 32;
   61 }
   62 
   63 static __inline int64_t
   64 betohq(int64_t x)
   65 {
   66         return (int64_t)ntohl((u_int32_t)(x >> 32)) |
   67             (int64_t)ntohl((u_int32_t)(x & 0xffffffff)) << 32;
   68 }
   69 
   70 #else   /* (BYTE_ORDER == LITTLE_ENDIAN) */
   71 
   72 #error "Macros for Big-Endians are incomplete"
   73 
   74 /*
   75 #define htoles(x)       ((u_int16_t)(x))
   76 #define letohs(x)       ((u_int16_t)(x))
   77 #define htolel(x)       ((u_int32_t)(x))
   78 #define letohl(x)       ((u_int32_t)(x))
   79 */
   80 #endif  /* (BYTE_ORDER == LITTLE_ENDIAN) */
   81 
   82 
   83 #ifdef _KERNEL
   84 
   85 /*
   86  * Type of copy for mb_{put|get}_mem()
   87  */
   88 #define MB_MSYSTEM      0               /* use bcopy() */
   89 #define MB_MUSER        1               /* use copyin()/copyout() */
   90 #define MB_MINLINE      2               /* use an inline copy loop */
   91 #define MB_MZERO        3               /* bzero(), mb_put_mem only */
   92 #define MB_MCUSTOM      4               /* use an user defined function */
   93 
   94 struct mbuf;
   95 struct mbchain;
   96 
   97 typedef int mb_copy_t(struct mbchain *mbp, c_caddr_t src, caddr_t dst, int len);
   98 
   99 struct mbchain {
  100         struct mbuf *   mb_top;         /* head of mbufs chain */
  101         struct mbuf *   mb_cur;         /* current mbuf */
  102         int             mb_mleft;       /* free space in the current mbuf */
  103         int             mb_count;       /* total number of bytes */
  104         mb_copy_t *     mb_copy;        /* user defined copy function */
  105         void *          mb_udata;       /* user data */
  106 };
  107 
  108 struct mdchain {
  109         struct mbuf *   md_top;         /* head of mbufs chain */
  110         struct mbuf *   md_cur;         /* current mbuf */
  111         u_char *        md_pos;         /* offset in the current mbuf */
  112 };
  113 
  114 int  mb_init(struct mbchain *mbp);
  115 void mb_initm(struct mbchain *mbp, struct mbuf *m);
  116 void mb_done(struct mbchain *mbp);
  117 struct mbuf *mb_detach(struct mbchain *mbp);
  118 int  mb_fixhdr(struct mbchain *mbp);
  119 caddr_t mb_reserve(struct mbchain *mbp, int size);
  120 
  121 int  mb_put_uint8(struct mbchain *mbp, u_int8_t x);
  122 int  mb_put_uint16be(struct mbchain *mbp, u_int16_t x);
  123 int  mb_put_uint16le(struct mbchain *mbp, u_int16_t x);
  124 int  mb_put_uint32be(struct mbchain *mbp, u_int32_t x);
  125 int  mb_put_uint32le(struct mbchain *mbp, u_int32_t x);
  126 int  mb_put_int64be(struct mbchain *mbp, int64_t x);
  127 int  mb_put_int64le(struct mbchain *mbp, int64_t x);
  128 int  mb_put_mem(struct mbchain *mbp, c_caddr_t source, int size, int type);
  129 int  mb_put_mbuf(struct mbchain *mbp, struct mbuf *m);
  130 int  mb_put_uio(struct mbchain *mbp, struct uio *uiop, int size);
  131 
  132 int  md_init(struct mdchain *mdp);
  133 void md_initm(struct mdchain *mbp, struct mbuf *m);
  134 void md_done(struct mdchain *mdp);
  135 void md_append_record(struct mdchain *mdp, struct mbuf *top);
  136 int  md_next_record(struct mdchain *mdp);
  137 int  md_get_uint8(struct mdchain *mdp, u_int8_t *x);
  138 int  md_get_uint16(struct mdchain *mdp, u_int16_t *x);
  139 int  md_get_uint16le(struct mdchain *mdp, u_int16_t *x);
  140 int  md_get_uint16be(struct mdchain *mdp, u_int16_t *x);
  141 int  md_get_uint32(struct mdchain *mdp, u_int32_t *x);
  142 int  md_get_uint32be(struct mdchain *mdp, u_int32_t *x);
  143 int  md_get_uint32le(struct mdchain *mdp, u_int32_t *x);
  144 int  md_get_int64(struct mdchain *mdp, int64_t *x);
  145 int  md_get_int64be(struct mdchain *mdp, int64_t *x);
  146 int  md_get_int64le(struct mdchain *mdp, int64_t *x);
  147 int  md_get_mem(struct mdchain *mdp, caddr_t target, int size, int type);
  148 int  md_get_mbuf(struct mdchain *mdp, int size, struct mbuf **m);
  149 int  md_get_uio(struct mdchain *mdp, struct uio *uiop, int size);
  150 
  151 #endif  /* ifdef _KERNEL */
  152 
  153 #endif  /* !_SYS_MCHAIN_H_ */

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