| | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| | 2 | /* |
| | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| | 4 | * |
| | 5 | * Misc memory accessors |
| | 6 | */ |
| | 7 | |
| | 8 | #include <linux/export.h> |
| | 9 | #include <linux/io.h> |
| | 10 | #include <linux/uaccess.h> |
| | 11 | #include <sound/core.h> |
| | 12 | |
| | 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 | * |
| | 21 | * Return: Zero if successful, or non-zero on failure. |
| | 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) |
| | 26 | return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0; |
| | 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 | } |
| | 43 | EXPORT_SYMBOL(copy_to_user_fromio); |
| | 44 | |
| | 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 | * |
| | 53 | * Return: Zero if successful, or non-zero on failure. |
| | 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) |
| | 58 | return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0; |
| | 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 | } |
| | 75 | EXPORT_SYMBOL(copy_from_user_toio); |
projects / linux-2.6-block.git / blame_incremental