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/*
* Linux 2.6.32 and later Kernel module for VMware MVP Hypervisor Support
*
* Copyright (C) 2010-2012 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; see the file COPYING. If not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#line 5
/**
* @file
*
* @brief Generic shared memory transport API.
*/
#ifndef _COMM_TRANSP_H_
#define _COMM_TRANSP_H_
#define INCLUDE_ALLOW_PV
#define INCLUDE_ALLOW_MODULE
#define INCLUDE_ALLOW_MONITOR
#define INCLUDE_ALLOW_GPL
#include "include_check.h"
/*
* Common shared memory identifier.
* External handle that makes sense to both hypervisor and guest.
*/
#define COMM_TRANSP_ID_8_ANY ((unsigned char)-1)
#define COMM_TRANSP_ID_32_ANY ((unsigned int)-1)
#define COMM_TRANSP_ID_64_ANY ((unsigned long long)-1)
typedef struct CommTranspID {
union {
unsigned char d8[8];
unsigned int d32[2];
unsigned long long d64;
};
} CommTranspID;
/* Basic initialization arguments. */
typedef enum CommTranspInitMode {
COMM_TRANSP_INIT_CREATE = 0x0,
COMM_TRANSP_INIT_ATTACH = 0x1
} CommTranspInitMode;
typedef struct CommTranspInitArgs {
unsigned int capacity; // Shared memory capacity.
unsigned int type; // Type / implementation using this area.
CommTranspID id; // ID (name) of shared memory area.
CommTranspInitMode mode; // Init mode (above).
} CommTranspInitArgs;
/**
* @brief Generate a type id from description (protocol) string. This function
* uses djb2, a string hashing algorithm by Dan Bernstein.
* (see http://www.cse.yorku.ca/~oz/hash.html)
* @param str string to hash
* @return 32-bit hash value
*/
static inline unsigned int
CommTransp_GetType(const char *str)
{
unsigned int hash = 5381;
int c;
while ((c = *str++)) {
hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
}
return hash;
}
#endif // _COMM_TRANSP_H_
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