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      1 /*	$NetBSD: shmifvar.h,v 1.12 2024/09/02 05:12:53 ozaki-r Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2009, 2010 Antti Kantee.  All Rights Reserved.
      5  *
      6  * Development of this software was supported by The Nokia Foundation.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     20  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     23  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  * SUCH DAMAGE.
     28  */
     29 
     30 #ifndef _RUMP_NET_SHMIFVAR_H_
     31 #define _RUMP_NET_SHMIFVAR_H_
     32 
     33 #define SHMIF_MAGIC 0xca11d054
     34 #define SHMIF_VERSION 3
     35 
     36 struct shmif_mem {
     37 	uint32_t shm_magic;
     38 	uint32_t shm_version;
     39 
     40 	uint64_t shm_gen;
     41 
     42 	uint32_t shm_first;
     43 	uint32_t shm_last;
     44 
     45 	uint32_t shm_lock;
     46 	uint32_t shm_spare[1];
     47 
     48 	uint8_t shm_data[0];
     49 };
     50 
     51 #define IFMEM_DATA	(offsetof(struct shmif_mem, shm_data))
     52 #define IFMEM_WAKEUP	(offsetof(struct shmif_mem, shm_version))
     53 
     54 struct shmif_pkthdr {
     55 	uint32_t sp_len;
     56 
     57 	uint32_t sp_sec;
     58 	uint32_t sp_usec;
     59 
     60 	uint64_t sp_sender;
     61 };
     62 
     63 #define BUSMEM_SIZE (1024*1024U)
     64 #define BUSMEM_DATASIZE (BUSMEM_SIZE - sizeof(struct shmif_mem))
     65 
     66 #define LOCK_UNLOCKED	0
     67 #define LOCK_LOCKED	1
     68 #define LOCK_COOLDOWN	1001
     69 
     70 #if 0
     71 #ifdef _KERNEL
     72 #include <rump/rumpuser.h>
     73 #define DPRINTF(x) rumpuser_dprintf x
     74 #else
     75 #include <stdio.h>
     76 #define DPRINTF(x) printf x
     77 #endif
     78 #else
     79 #define DPRINTF(x)
     80 #endif
     81 
     82 uint32_t	shmif_advance(uint32_t, uint32_t);
     83 uint32_t	shmif_busread(struct shmif_mem *,
     84 			      void *, uint32_t, size_t, bool *);
     85 void		shmif_advancefirst(struct shmif_mem *, uint32_t, size_t);
     86 uint32_t	shmif_buswrite(struct shmif_mem *, uint32_t,
     87 			       void *, size_t, bool *);
     88 uint32_t	shmif_nextpktoff(struct shmif_mem *, uint32_t);
     89 
     90 #endif
     91