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75 lines
1.8 KiB
75 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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* |
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* Misc memory accessors |
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*/ |
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#include <linux/export.h> |
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#include <linux/io.h> |
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#include <linux/uaccess.h> |
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#include <sound/core.h> |
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/** |
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* copy_to_user_fromio - copy data from mmio-space to user-space |
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* @dst: the destination pointer on user-space |
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* @src: the source pointer on mmio |
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* @count: the data size to copy in bytes |
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* |
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* Copies the data from mmio-space to user-space. |
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* |
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* Return: Zero if successful, or non-zero on failure. |
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*/ |
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int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count) |
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{ |
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#if defined(__i386__) || defined(CONFIG_SPARC32) |
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return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0; |
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#else |
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char buf[256]; |
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while (count) { |
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size_t c = count; |
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if (c > sizeof(buf)) |
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c = sizeof(buf); |
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memcpy_fromio(buf, (void __iomem *)src, c); |
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if (copy_to_user(dst, buf, c)) |
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return -EFAULT; |
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count -= c; |
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dst += c; |
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src += c; |
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} |
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return 0; |
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#endif |
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} |
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EXPORT_SYMBOL(copy_to_user_fromio); |
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/** |
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* copy_from_user_toio - copy data from user-space to mmio-space |
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* @dst: the destination pointer on mmio-space |
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* @src: the source pointer on user-space |
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* @count: the data size to copy in bytes |
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* |
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* Copies the data from user-space to mmio-space. |
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* |
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* Return: Zero if successful, or non-zero on failure. |
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*/ |
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int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count) |
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{ |
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#if defined(__i386__) || defined(CONFIG_SPARC32) |
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return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0; |
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#else |
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char buf[256]; |
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while (count) { |
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size_t c = count; |
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if (c > sizeof(buf)) |
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c = sizeof(buf); |
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if (copy_from_user(buf, src, c)) |
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return -EFAULT; |
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memcpy_toio(dst, buf, c); |
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count -= c; |
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dst += c; |
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src += c; |
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} |
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return 0; |
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#endif |
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} |
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EXPORT_SYMBOL(copy_from_user_toio);
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