mirror of https://gitee.com/openkylin/linux.git
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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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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