src/cpu.h

   1 /*
   2  * This file is part of OpenTTD.
   3  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   4  * OpenTTD 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.
   5  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   6  */
   7
   8 /** @file cpu.h Functions related to CPU specific instructions. */
   9
  10 #ifndef CPU_H
  11 #define CPU_H
  12
  13 /**
  14  * Get the tick counter from the CPU (high precision timing).
  15  * @return The count.
  16  */
  17 uint64 ottd_rdtsc();
  18
  19 /**
  20  * Get the CPUID information from the CPU.
  21  * @param info The retrieved info. All zeros on architectures without CPUID.
  22  * @param type The information this instruction should retrieve.
  23  */
  24 void ottd_cpuid(int info[4], int type);
  25
  26 /**
  27  * Check whether the current CPU has the given flag.
  28  * @param type  The type to be passing to cpuid (usually 1).
  29  * @param index The index in the returned info array.
  30  * @param bit   The bit index that needs to be set.
  31  * @return The value of the bit, or false when there is no CPUID or the type is not available.
  32  */
  33 bool HasCPUIDFlag(uint type, uint index, uint bit);
  34
  35 #endif /* CPU_H */