src/cpu/utils.hh

   1 /*
   2  * Copyright (c) 2017-2018 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are
  16  * met: redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer;
  18  * redistributions in binary form must reproduce the above copyright
  19  * notice, this list of conditions and the following disclaimer in the
  20  * documentation and/or other materials provided with the distribution;
  21  * neither the name of the copyright holders nor the names of its
  22  * contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #ifndef __CPU_UTILS_HH__
  39 #define __CPU_UTILS_HH__
  40
  41 #include "base/types.hh"
  42
  43 /**
  44  * Calculates the offset of a given address wrt aligned fixed-size blocks.
  45  * @param addr Input address.
  46  * @param block_size Block size in bytes.
  47  * @return Offset of the given address in bytes.
  48  */
  49 inline Addr
  50 addrBlockOffset(Addr addr, Addr block_size)
  51 {
  52     return addr & (block_size - 1);
  53 }
  54
  55 /**
  56  * Returns the address of the closest aligned fixed-size block to the given
  57  * address.
  58  * @param addr Input address.
  59  * @param block_size Block size in bytes.
  60  * @return Address of the closest aligned block.
  61  */
  62 inline Addr
  63 addrBlockAlign(Addr addr, Addr block_size)
  64 {
  65     return addr & ~(block_size - 1);
  66 }
  67
  68 /**
  69  * Returns true if the given memory access (address, size) needs to be
  70  * fragmented across aligned fixed-size blocks.
  71  * @param addr Address of the memory access.
  72  * @param size Size of the memory access.
  73  * @param block_size Block size in bytes.
  74  * @return True if the memory access needs to be fragmented.
  75  */
  76 inline bool
  77 transferNeedsBurst(Addr addr, unsigned int size, unsigned int block_size)
  78 {
  79     return (addrBlockOffset(addr, block_size) + size) > block_size;
  80 }
  81
  82 /**
  83  * Test if there is any active element in an enablement range.
  84  */
  85 inline bool
  86 isAnyActiveElement(const std::vector<bool>::const_iterator& it_start,
  87                    const std::vector<bool>::const_iterator& it_end)
  88 {
  89     auto it_tmp = it_start;
  90     for (;it_tmp != it_end && !(*it_tmp); ++it_tmp);
  91     return (it_tmp != it_end);
  92 }
  93
  94 #endif // __CPU_UTILS_HH__