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/usr/include/xen/sys/privcmd.h is in libxen-dev 4.6.5-0ubuntu1.4.

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/******************************************************************************
 * privcmd.h
 * 
 * Interface to /proc/xen/privcmd.
 * 
 * Copyright (c) 2003-2005, K A Fraser
 * 
 * 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; or, when distributed
 * separately from the Linux kernel or incorporated into other
 * software packages, subject to the following license:
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef __LINUX_PUBLIC_PRIVCMD_H__
#define __LINUX_PUBLIC_PRIVCMD_H__

#include <linux/types.h>

#ifndef __user
#define __user
#endif

typedef struct privcmd_hypercall
{
	__u64 op;
	__u64 arg[5];
} privcmd_hypercall_t;

typedef struct privcmd_mmap_entry {
	__u64 va;
	__u64 mfn;
	__u64 npages;
} privcmd_mmap_entry_t; 

typedef struct privcmd_mmap {
	int num;
	domid_t dom; /* target domain */
	privcmd_mmap_entry_t __user *entry;
} privcmd_mmap_t; 

typedef struct privcmd_mmapbatch {
	int num;     /* number of pages to populate */
	domid_t dom; /* target domain */
	__u64 addr;  /* virtual address */
	xen_pfn_t __user *arr; /* array of mfns - top nibble set on err */
} privcmd_mmapbatch_t; 

#define PRIVCMD_MMAPBATCH_MFN_ERROR     0xf0000000U
#define PRIVCMD_MMAPBATCH_PAGED_ERROR   0x80000000U

typedef struct privcmd_mmapbatch_v2 {
	unsigned int num; /* number of pages to populate */
	domid_t dom;      /* target domain */
	__u64 addr;       /* virtual address */
	const xen_pfn_t __user *arr; /* array of mfns */
	int __user *err;  /* array of error codes */
} privcmd_mmapbatch_v2_t;

/*
 * @cmd: IOCTL_PRIVCMD_HYPERCALL
 * @arg: &privcmd_hypercall_t
 * Return: Value returned from execution of the specified hypercall.
 */
#define IOCTL_PRIVCMD_HYPERCALL					\
	_IOC(_IOC_NONE, 'P', 0, sizeof(privcmd_hypercall_t))
#define IOCTL_PRIVCMD_MMAP					\
	_IOC(_IOC_NONE, 'P', 2, sizeof(privcmd_mmap_t))
#define IOCTL_PRIVCMD_MMAPBATCH					\
	_IOC(_IOC_NONE, 'P', 3, sizeof(privcmd_mmapbatch_t))
#define IOCTL_PRIVCMD_MMAPBATCH_V2				\
	_IOC(_IOC_NONE, 'P', 4, sizeof(privcmd_mmapbatch_v2_t))

#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */