// 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);