kernel_samsung_msm8974/arch/arm/mvp/pvtcpkm/comm_transp.h

/*
 * Linux 2.6.32 and later Kernel module for VMware MVP PVTCP Server
 *
 * Copyright (C) 2010-2013 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_ */