| 1 | /* $NetBSD: uaccess.h,v 1.2 2014/03/18 18:20:42 riastradh Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2013 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Taylor R. Campbell. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #ifndef _ASM_UACCESS_H_ |
| 33 | #define _ASM_UACCESS_H_ |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/systm.h> |
| 37 | |
| 38 | /* XXX This is a cop-out. */ |
| 39 | #define VERIFY_READ 0 |
| 40 | #define VERIFY_WRITE 1 |
| 41 | static inline bool |
| 42 | access_ok(int verify_op __unused, const void *uaddr __unused, |
| 43 | size_t nbytes __unused) |
| 44 | { |
| 45 | return true; |
| 46 | } |
| 47 | |
| 48 | #define __copy_from_user copy_from_user |
| 49 | #define __copy_to_user copy_to_user |
| 50 | |
| 51 | static inline int |
| 52 | copy_from_user(void *kernel_addr, const void *user_addr, size_t len) |
| 53 | { |
| 54 | /* XXX errno NetBSD->Linux */ |
| 55 | return -copyin(user_addr, kernel_addr, len); |
| 56 | } |
| 57 | |
| 58 | static inline int |
| 59 | copy_to_user(void *user_addr, const void *kernel_addr, size_t len) |
| 60 | { |
| 61 | /* XXX errno NetBSD->Linux */ |
| 62 | return -copyout(kernel_addr, user_addr, len); |
| 63 | } |
| 64 | |
| 65 | #define get_user(KERNEL_LOC, USER_ADDR) \ |
| 66 | copy_from_user(&(KERNEL_LOC), (USER_ADDR), sizeof(KERNEL_LOC)) |
| 67 | |
| 68 | #define put_user(KERNEL_LOC, USER_ADDR) \ |
| 69 | copy_to_user((USER_ADDR), &(KERNEL_LOC), sizeof(KERNEL_LOC)) |
| 70 | |
| 71 | #if 0 |
| 72 | /* |
| 73 | * XXX These `inatomic' versions are a cop out, but they should do for |
| 74 | * now -- they are used only in fast paths which can't fault but which |
| 75 | * can fall back to slower paths that arrange things so faulting is OK. |
| 76 | */ |
| 77 | |
| 78 | static inline int |
| 79 | __copy_from_user_inatomic(void *kernel_addr __unused, |
| 80 | const void *user_addr __unused, size_t len __unused) |
| 81 | { |
| 82 | return -EFAULT; |
| 83 | } |
| 84 | |
| 85 | static inline int |
| 86 | __copy_to_user_inatomic(void *user_addr __unused, |
| 87 | const void *kernel_addr __unused, size_t len __unused) |
| 88 | { |
| 89 | return -EFAULT; |
| 90 | } |
| 91 | #endif /* 0 */ |
| 92 | |
| 93 | static inline int |
| 94 | __copy_from_user_inatomic_nocache(void *kernel_addr __unused, |
| 95 | const void *user_addr __unused, size_t len __unused) |
| 96 | { |
| 97 | return -EFAULT; |
| 98 | } |
| 99 | |
| 100 | #endif /* _ASM_UACCESS_H_ */ |
| 101 | |