84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
![]() |
/*
|
||
|
* 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_BIT_WP" to UFFD_API_BITS after implementing it */
|
||
|
#define UFFD_API_BITS (UFFD_BIT_WRITE)
|
||
|
#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 */
|
||
|
|
||
|
struct uffdio_api {
|
||
|
/* userland asks for an API number */
|
||
|
__u64 api;
|
||
|
|
||
|
/* kernel answers below with the available features for the API */
|
||
|
__u64 bits;
|
||
|
__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 */
|