auto + l4( (  fB- _I|+* /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * include/linux/userfaultfd.h * * Copyright (C) 2007 Davide Libenzi * Copyright (C) 2015 Red Hat, Inc. * */ #ifndef _LINUX_USERFAULTFD_H #define _LINUX_USERFAULTFD_H #include /* ioctls for /dev/userfaultfd */ #define USERFAULTFD_IOC 0xAA #define USERFAULTFD_IOC_NEW _IO(USERFAULTFD_IOC, 0x00) /* * If the UFFDIO_API is upgraded someday, the UFFDIO_UNREGISTER and * UFFDIO_WAKE ioctls should be defined as _IOW and not as _IOR. In * userfaultfd.h we assumed the kernel was reading (instead _IOC_READ * means the userland is reading). */ #define UFFD_API ((__u64)0xAA) #define UFFD_API_REGISTER_MODES (UFFDIO_REGISTER_MODE_MISSING | \ UFFDIO_REGISTER_MODE_WP | \ UFFDIO_REGISTER_MODE_MINOR) #define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP | \ UFFD_FEATURE_EVENT_FORK | \ UFFD_FEATURE_EVENT_REMAP | \ UFFD_FEATURE_EVENT_REMOVE | \ UFFD_FEATURE_EVENT_UNMAP | \ UFFD_FEATURE_MISSING_HUGETLBFS | \ UFFD_FEATURE_MISSING_SHMEM | \ UFFD_FEATURE_SIGBUS | \ UFFD_FEATURE_THREAD_ID | \ UFFD_FEATURE_MINOR_HUGETLBFS | \ UFFD_FEATURE_MINOR_SHMEM | \ UFFD_FEATURE_EXACT_ADDRESS | \ UFFD_FEATURE_WP_HUGETLBFS_SHMEM | \ UFFD_FEATURE_WP_UNPOPULATED | \ UFFD_FEATURE_POISON) #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 | \ (__u64)1 << _UFFDIO_COPY | \ (__u64)1 << _UFFDIO_ZEROPAGE | \ (__u64)1 << _UFFDIO_WRITEPROTECT | \ (__u64)1 << _UFFDIO_CONTINUE | \ (__u64)1 << _UFFDIO_POISON) #define UFFD_API_RANGE_IOCTLS_BASIC \ ((__u64)1 << _UFFDIO_WAKE | \ (__u64)1 << _UFFDIO_COPY | \ (__u64)1 << _UFFDIO_WRITEPROTECT | \ (__u64)1 << _UFFDIO_CONTINUE | \ (__u64)1 << _UFFDIO_POISON) /* * 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_COPY (0x03) #define _UFFDIO_ZEROPAGE (0x04) #define _UFFDIO_WRITEPROTECT (0x06) #define _UFFDIO_CONTINUE (0x07) #define _UFFDIO_POISON (0x08) #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) #define UFFDIO_COPY _IOWR(UFFDIO, _UFFDIO_COPY, \ struct uffdio_copy) #define UFFDIO_ZEROPAGE _IOWR(UFFDIO, _UFFDIO_ZEROPAGE, \ struct uffdio_zeropage) #define UFFDIO_WRITEPROTECT _IOWR(UFFDIO, _UFFDIO_WRITEPROTECT, \ struct uffdio_writeprotect) #define UFFDIO_CONTINUE _IOWR(UFFDIO, _UFFDIO_CONTINUE, \ struct uffdio_continue) #define UFFDIO_POISON _IOWR(UFFDIO, _UFFDIO_POISON, \ struct uffdio_poison) /* read() structure */ struct uffd_msg { __u8 event; __u8 reserved1; __u16 reserved2; __u32 reserved3; union { struct { __u64 flags; __u64 address; union { __u32 ptid; } feat; } pagefault; struct { __u32 ufd; } fork; struct { __u64 from; __u64 to; __u64 len; } remap; struct { __u64 start; __u64 end; } remove; struct { /* unused reserved fields */ __u64 reserved1; __u64 reserved2; __u64 reserved3; } reserved; } arg; } __packed; /* * Start at 0x