cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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qib_pio_copy.c (2273B)

      1/*
      2 * Copyright (c) 2009 QLogic Corporation. All rights reserved.
      3 *
      4 * This software is available to you under a choice of one of two
      5 * licenses.  You may choose to be licensed under the terms of the GNU
      6 * General Public License (GPL) Version 2, available from the file
      7 * COPYING in the main directory of this source tree, or the
      8 * OpenIB.org BSD license below:
      9 *
     10 *     Redistribution and use in source and binary forms, with or
     11 *     without modification, are permitted provided that the following
     12 *     conditions are met:
     13 *
     14 *      - Redistributions of source code must retain the above
     15 *        copyright notice, this list of conditions and the following
     16 *        disclaimer.
     17 *
     18 *      - Redistributions in binary form must reproduce the above
     19 *        copyright notice, this list of conditions and the following
     20 *        disclaimer in the documentation and/or other materials
     21 *        provided with the distribution.
     22 *
     23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     30 * SOFTWARE.
     31 */
     32
     33#include "qib.h"
     34
     35/**
     36 * qib_pio_copy - copy data to MMIO space, in multiples of 32-bits
     37 * @to: destination, in MMIO space (must be 64-bit aligned)
     38 * @from: source (must be 64-bit aligned)
     39 * @count: number of 32-bit quantities to copy
     40 *
     41 * Copy data from kernel space to MMIO space, in multiples of 32 bits at a
     42 * time.  Order of access is not guaranteed, nor is a memory barrier
     43 * performed afterwards.
     44 */
     45void qib_pio_copy(void __iomem *to, const void *from, size_t count)
     46{
     47#ifdef CONFIG_64BIT
     48	u64 __iomem *dst = to;
     49	const u64 *src = from;
     50	const u64 *end = src + (count >> 1);
     51
     52	while (src < end)
     53		__raw_writeq(*src++, dst++);
     54	if (count & 1)
     55		__raw_writel(*(const u32 *)src, dst);
     56#else
     57	u32 __iomem *dst = to;
     58	const u32 *src = from;
     59	const u32 *end = src + count;
     60
     61	while (src < end)
     62		__raw_writel(*src++, dst++);
     63#endif
     64}