FreeBSD/Linux Kernel Cross Reference
sys/lib/iomap_copy.c

     /*
      * Copyright 2006 PathScale, Inc.  All Rights Reserved.
      *
      * This file is free software; you can redistribute it and/or modify
      * it under the terms of version 2 of the GNU General Public License
      * as published by the Free Software Foundation.
      *
      * This program is distributed in the hope that it will be useful,
      * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software Foundation,
     * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
     */
    
    #include <linux/export.h>
    #include <linux/io.h>
    
    /**
     * __iowrite32_copy - copy data to MMIO space, in 32-bit units
     * @to: destination, in MMIO space (must be 32-bit aligned)
     * @from: source (must be 32-bit aligned)
     * @count: number of 32-bit quantities to copy
     *
     * Copy data from kernel space to MMIO space, in units of 32 bits at a
     * time.  Order of access is not guaranteed, nor is a memory barrier
     * performed afterwards.
     */
    void __attribute__((weak)) __iowrite32_copy(void __iomem *to,
                                                const void *from,
                                                size_t count)
    {
            u32 __iomem *dst = to;
            const u32 *src = from;
            const u32 *end = src + count;
    
            while (src < end)
                    __raw_writel(*src++, dst++);
    }
    EXPORT_SYMBOL_GPL(__iowrite32_copy);
    
    /**
     * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units
     * @to: destination, in MMIO space (must be 64-bit aligned)
     * @from: source (must be 64-bit aligned)
     * @count: number of 64-bit quantities to copy
     *
     * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a
     * time.  Order of access is not guaranteed, nor is a memory barrier
     * performed afterwards.
     */
    void __attribute__((weak)) __iowrite64_copy(void __iomem *to,
                                                const void *from,
                                                size_t count)
    {
    #ifdef CONFIG_64BIT
            u64 __iomem *dst = to;
            const u64 *src = from;
            const u64 *end = src + count;
    
            while (src < end)
                    __raw_writeq(*src++, dst++);
    #else
            __iowrite32_copy(to, from, count * 2);
    #endif
    }
    
    EXPORT_SYMBOL_GPL(__iowrite64_copy);

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