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/*
* include/linux/userfaultfd.h
*
* Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
* Copyright (C) 2015 Red Hat, Inc.
*
*/
#ifndef _LINUX_USERFAULTFD_H
#define _LINUX_USERFAULTFD_H
#include <linux/types.h>
#define UFFD_API ((__u64)0xAA)
/* FIXME: add "|UFFD_FEATURE_WP" to UFFD_API_FEATURES after implementing it */
#define UFFD_API_FEATURES (UFFD_FEATURE_WRITE_BIT)
#define UFFD_API_IOCTLS \
((__u64)1 << _UFFDIO_REGISTER | \
(__u64)1 << _UFFDIO_UNREGISTER | \
(__u64)1 << _UFFDIO_API)
#define UFFD_API_RANGE_IOCTLS \
((__u64)1 << _UFFDIO_WAKE)
/*
* Valid ioctl command number range with this API is from 0x00 to
* 0x3F. UFFDIO_API is the fixed number, everything else can be
* changed by implementing a different UFFD_API. If sticking to the
* same UFFD_API more ioctl can be added and userland will be aware of
* which ioctl the running kernel implements through the ioctl command
* bitmask written by the UFFDIO_API.
*/
#define _UFFDIO_REGISTER (0x00)
#define _UFFDIO_UNREGISTER (0x01)
#define _UFFDIO_WAKE (0x02)
#define _UFFDIO_API (0x3F)
/* userfaultfd ioctl ids */
#define UFFDIO 0xAA
#define UFFDIO_API _IOWR(UFFDIO, _UFFDIO_API, \
struct uffdio_api)
#define UFFDIO_REGISTER _IOWR(UFFDIO, _UFFDIO_REGISTER, \
struct uffdio_register)
#define UFFDIO_UNREGISTER _IOR(UFFDIO, _UFFDIO_UNREGISTER, \
struct uffdio_range)
#define UFFDIO_WAKE _IOR(UFFDIO, _UFFDIO_WAKE, \
struct uffdio_range)
/*
* Valid bits below PAGE_SHIFT in the userfault address read through
* the read() syscall.
*/
#define UFFD_BIT_WRITE (1<<0) /* this was a write fault, MISSING or WP */
#define UFFD_BIT_WP (1<<1) /* handle_userfault() reason VM_UFFD_WP */
#define UFFD_BITS 2 /* two above bits used for UFFD_BIT_* mask */
/*
* Features reported in uffdio_api.features field
*/
#define UFFD_FEATURE_WRITE_BIT (1<<0) /* Corresponds to UFFD_BIT_WRITE */
#define UFFD_FEATURE_WP_BIT (1<<1) /* Corresponds to UFFD_BIT_WP */
struct uffdio_api {
/* userland asks for an API number */
__u64 api;
/* kernel answers below with the available features for the API */
__u64 features;
__u64 ioctls;
};
struct uffdio_range {
__u64 start;
__u64 len;
};
struct uffdio_register {
struct uffdio_range range;
#define UFFDIO_REGISTER_MODE_MISSING ((__u64)1<<0)
#define UFFDIO_REGISTER_MODE_WP ((__u64)1<<1)
__u64 mode;
/*
* kernel answers which ioctl commands are available for the
* range, keep at the end as the last 8 bytes aren't read.
*/
__u64 ioctls;
};
#endif /* _LINUX_USERFAULTFD_H */
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