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