138 lines
4.5 KiB
C++
138 lines
4.5 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file cpu.cpp OS/CPU/compiler dependent CPU specific calls. */
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#include "stdafx.h"
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#include "core/bitmath_func.hpp"
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#include "safeguards.h"
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#undef RDTSC_AVAILABLE
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/* rdtsc for MSC_VER, uses simple inline assembly, or _rdtsc
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* from external win64.asm because VS2005 does not support inline assembly */
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#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) && !defined(RDTSC_AVAILABLE)
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#include <intrin.h>
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uint64 ottd_rdtsc()
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{
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return __rdtsc();
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}
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#define RDTSC_AVAILABLE
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#endif
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/* rdtsc for OS/2. Hopefully this works, who knows */
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#if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE)
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unsigned __int64 ottd_rdtsc();
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# pragma aux ottd_rdtsc = 0x0F 0x31 value [edx eax] parm nomemory modify exact [edx eax] nomemory;
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# define RDTSC_AVAILABLE
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#endif
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/* rdtsc for all other *nix-en (hopefully). Use GCC syntax */
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#if (defined(__i386__) || defined(__x86_64__)) && !defined(RDTSC_AVAILABLE)
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uint64 ottd_rdtsc()
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{
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uint32 high, low;
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__asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high));
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return ((uint64)high << 32) | low;
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}
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# define RDTSC_AVAILABLE
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#endif
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/* rdtsc for PPC which has this not */
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#if (defined(__POWERPC__) || defined(__powerpc__)) && !defined(RDTSC_AVAILABLE)
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uint64 ottd_rdtsc()
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{
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uint32 high = 0, high2 = 0, low;
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/* PPC does not have rdtsc, so we cheat by reading the two 32-bit time-counters
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* it has, 'Move From Time Base (Upper)'. Since these are two reads, in the
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* very unlikely event that the lower part overflows to the upper part while we
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* read it; we double-check and reread the registers */
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asm volatile (
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"mftbu %0\n"
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"mftb %1\n"
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"mftbu %2\n"
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"cmpw %3,%4\n"
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"bne- $-16\n"
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: "=r" (high), "=r" (low), "=r" (high2)
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: "0" (high), "2" (high2)
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);
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return ((uint64)high << 32) | low;
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}
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# define RDTSC_AVAILABLE
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#endif
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/* In all other cases we have no support for rdtsc. No major issue,
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* you just won't be able to profile your code with TIC()/TOC() */
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#if !defined(RDTSC_AVAILABLE)
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#warning "(non-fatal) No support for rdtsc(), you won't be able to profile with TIC/TOC"
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uint64 ottd_rdtsc() {return 0;}
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#endif
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/**
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* Definitions for CPU detection:
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*
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* MSVC offers cpu information while gcc only implements in gcc 4.8
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* __builtin_cpu_supports and friends
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* http://msdn.microsoft.com/library/vstudio/hskdteyh%28v=vs.100%29.aspx
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* http://gcc.gnu.org/onlinedocs/gcc/X86-Built-in-Functions.html
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*
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* Other platforms/architectures don't have CPUID, so zero the info and then
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* most (if not all) of the features are set as if they do not exist.
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*/
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#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
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void ottd_cpuid(int info[4], int type)
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{
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__cpuid(info, type);
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}
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#elif defined(__x86_64__) || defined(__i386)
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void ottd_cpuid(int info[4], int type)
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{
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#if defined(__i386) && defined(__PIC__)
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/* The easy variant would be just cpuid, however... ebx is being used by the GOT (Global Offset Table)
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* in case of PIC;
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* clobbering ebx is no alternative: some compiler versions don't like this
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* and will issue an error message like
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* "can't find a register in class 'BREG' while reloading 'asm'"
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*/
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__asm__ __volatile__ (
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"xchgl %%ebx, %1 \n\t"
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"cpuid \n\t"
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"xchgl %%ebx, %1 \n\t"
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: "=a" (info[0]), "=r" (info[1]), "=c" (info[2]), "=d" (info[3])
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/* It is safe to write "=r" for (info[1]) as in case that PIC is enabled for i386,
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* the compiler will not choose EBX as target register (but something else).
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*/
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: "a" (type)
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);
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#else
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__asm__ __volatile__ (
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"cpuid \n\t"
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: "=a" (info[0]), "=b" (info[1]), "=c" (info[2]), "=d" (info[3])
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: "a" (type)
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);
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#endif /* i386 PIC */
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}
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#else
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void ottd_cpuid(int info[4], int type)
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{
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info[0] = info[1] = info[2] = info[3] = 0;
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}
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#endif
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bool HasCPUIDFlag(uint type, uint index, uint bit)
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{
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int cpu_info[4] = {-1};
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ottd_cpuid(cpu_info, 0);
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uint max_info_type = cpu_info[0];
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if (max_info_type < type) return false;
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ottd_cpuid(cpu_info, type);
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return HasBit(cpu_info[index], bit);
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}
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