projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 1da177e4 | 2 | /* |
| c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <[email protected]> |
| 1da177e4 | 4 | * |
| e38e0cfa | 5 | * Misc memory accessors |
| 1da177e4 LT |
6 | */ |
| 7 | ||
| d81a6d71 | 8 | #include <linux/export.h> |
| 6cbbfe1c | 9 | #include <linux/io.h> |
| 976412fb | 10 | #include <linux/uaccess.h> |
| 9004acc7 | 11 | #include <sound/core.h> |
| 1da177e4 | 12 | |
| 1da177e4 LT |
13 | /** |
| 14 | * copy_to_user_fromio - copy data from mmio-space to user-space | |
| 15 | * @dst: the destination pointer on user-space | |
| 16 | * @src: the source pointer on mmio | |
| 17 | * @count: the data size to copy in bytes | |
| 18 | * | |
| 19 | * Copies the data from mmio-space to user-space. | |
| 20 | * | |
| eb7c06e8 | 21 | * Return: Zero if successful, or non-zero on failure. |
| 1da177e4 LT |
22 | */ |
| 23 | int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count) | |
| 24 | { | |
| 25 | #if defined(__i386__) || defined(CONFIG_SPARC32) | |
| 4d23359b | 26 | return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0; |
| 1da177e4 LT |
27 | #else |
| 28 | char buf[256]; | |
| 29 | while (count) { | |
| 30 | size_t c = count; | |
| 31 | if (c > sizeof(buf)) | |
| 32 | c = sizeof(buf); | |
| 33 | memcpy_fromio(buf, (void __iomem *)src, c); | |
| 34 | if (copy_to_user(dst, buf, c)) | |
| 35 | return -EFAULT; | |
| 36 | count -= c; | |
| 37 | dst += c; | |
| 38 | src += c; | |
| 39 | } | |
| 40 | return 0; | |
| 41 | #endif | |
| 42 | } | |
| c0d3fb39 TI |
43 | EXPORT_SYMBOL(copy_to_user_fromio); |
| 44 | ||
| 1da177e4 LT |
45 | /** |
| 46 | * copy_from_user_toio - copy data from user-space to mmio-space | |
| 47 | * @dst: the destination pointer on mmio-space | |
| 48 | * @src: the source pointer on user-space | |
| 49 | * @count: the data size to copy in bytes | |
| 50 | * | |
| 51 | * Copies the data from user-space to mmio-space. | |
| 52 | * | |
| eb7c06e8 | 53 | * Return: Zero if successful, or non-zero on failure. |
| 1da177e4 LT |
54 | */ |
| 55 | int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count) | |
| 56 | { | |
| 57 | #if defined(__i386__) || defined(CONFIG_SPARC32) | |
| 4d23359b | 58 | return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0; |
| 1da177e4 LT |
59 | #else |
| 60 | char buf[256]; | |
| 61 | while (count) { | |
| 62 | size_t c = count; | |
| 63 | if (c > sizeof(buf)) | |
| 64 | c = sizeof(buf); | |
| 65 | if (copy_from_user(buf, src, c)) | |
| 66 | return -EFAULT; | |
| 67 | memcpy_toio(dst, buf, c); | |
| 68 | count -= c; | |
| 69 | dst += c; | |
| 70 | src += c; | |
| 71 | } | |
| 72 | return 0; | |
| 73 | #endif | |
| 74 | } | |
| c0d3fb39 | 75 | EXPORT_SYMBOL(copy_from_user_toio); |