mirror of
https://github.com/NVIDIA/open-gpu-kernel-modules.git
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121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
/*
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* SPDX-FileCopyrightText: Copyright (c) 1993-2021 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/******************************* DisplayPort *******************************\
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* *
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* Module: dp_guid.h *
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* GUID struct and builder class *
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* *
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\***************************************************************************/
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#ifndef INCLUDED_DP_GUID_H
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#define INCLUDED_DP_GUID_H
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#include "dp_internal.h"
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#include "dp_timer.h"
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namespace DisplayPort
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{
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#define DPCD_GUID_SIZE 16
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struct GUID
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{
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NvU8 data[DPCD_GUID_SIZE];
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GUID()
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{
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dpMemZero(&data, sizeof(data));
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}
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bool isGuidZero()
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{
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for (unsigned i = 0 ; i < DPCD_GUID_SIZE; i++)
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if (data[i])
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return false;
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return true;
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}
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bool operator == (const GUID & other) const
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{
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for (unsigned i = 0 ; i < DPCD_GUID_SIZE; i++)
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if (data[i] != other.data[i])
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return false;
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return true;
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}
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bool operator != (const GUID & other) const
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{
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return !((*this) == other);
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}
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void copyFrom(const NvU8 * buffer)
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{
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dpMemCopy(&this->data[0], buffer, sizeof data);
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}
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// XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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// Two Xs per byte, plus four dashes and a NUL byte.
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typedef char StringBuffer[DPCD_GUID_SIZE*2 + 5];
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char * toString(StringBuffer & buffer) const
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{
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char *p = &buffer[0];
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for (unsigned i = 0; i < DPCD_GUID_SIZE; i++) {
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dpByteToHexChar(p, data[i]);
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p += 2;
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if (i == 3 || i == 5 || i == 7 || i == 9)
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*p++ = '-';
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}
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*p++ = '\0';
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DP_ASSERT(p == buffer + sizeof(buffer));
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return buffer;
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}
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};
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class GUIDBuilder
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{
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NvU32 salt;
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NvU32 previousRandom;
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Timer * source;
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//
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// Linear congruential random number generator
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// Seed values chosen from numerical methods
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//
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NvU32 random();
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public:
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GUIDBuilder(Timer * source, NvU32 salt);
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void makeGuid(GUID & guid);
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};
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}
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#endif //INCLUDED_DP_GUID_H
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