225 lines
5.8 KiB
C
225 lines
5.8 KiB
C
/* EINA - EFL data type library
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* Copyright (C) 2007-2008 Jorge Luis Zapata Muga
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library;
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* if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef EFL_HAVE_THREADS
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# ifdef _WIN32
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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# elif defined (__sun) || defined(__GNU__) || defined(__CYGWIN__)
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# include <unistd.h>
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# elif defined (__FreeBSD__) || defined (__OpenBSD__) || \
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defined (__NetBSD__) || defined (__DragonFly__) || defined (__MacOSX__) || \
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(defined (__MACH__) && defined (__APPLE__))
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# include <unistd.h>
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# include <sys/param.h>
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# include <sys/sysctl.h>
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# elif defined (__linux__) || defined(__GLIBC__)
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# include <sched.h>
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# endif
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# ifdef EFL_HAVE_POSIX_THREADS
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# include <pthread.h>
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# endif
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# define TH_MAX 8
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include "eina_cpu.h"
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/*============================================================================*
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* Local *
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*============================================================================*/
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/* FIXME this ifdefs should be replaced */
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#if defined(__i386__) || defined(__x86_64__)
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/* We save ebx and restore it to be PIC compatible */
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static inline void _x86_cpuid(int op, int *a, int *b, int *c, int *d)
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{
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__asm__ volatile (
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#if defined(__x86_64__)
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"pushq %%rbx \n\t" /* save %ebx */
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#else
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"pushl %%ebx \n\t" /* save %ebx */
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#endif
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"cpuid \n\t"
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"movl %%ebx, %1 \n\t" /* save what cpuid just put in %ebx */
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#if defined(__x86_64__)
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"popq %%rbx \n\t" /* restore the old %ebx */
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#else
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"popl %%ebx \n\t" /* restore the old %ebx */
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#endif
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: "=a" (*a), "=r" (*b), "=c" (*c), "=d" (*d)
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: "a" (op)
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: "cc");
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}
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static
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void _x86_simd(Eina_Cpu_Features *features)
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{
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int a, b, c, d;
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_x86_cpuid(1, &a, &b, &c, &d);
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/*
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* edx
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* 18 = PN (Processor Number)
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* 19 = CLFlush (Cache Line Flush)
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* 23 = MMX
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* 25 = SSE
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* 26 = SSE2
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* 28 = HTT (Hyper Threading)
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* ecx
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* 0 = SSE3
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*/
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if ((d >> 23) & 1)
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*features |= EINA_CPU_MMX;
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if ((d >> 25) & 1)
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*features |= EINA_CPU_SSE;
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if ((d >> 26) & 1)
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*features |= EINA_CPU_SSE2;
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if (c & 1)
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*features |= EINA_CPU_SSE3;
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}
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#endif
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/*============================================================================*
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* Global *
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*============================================================================*/
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/*============================================================================*
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* API *
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*============================================================================*/
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/* FIXME the features checks should be called when this function is called?
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* or make it static by doing eina_cpu_init() and return a local var
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*/
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/**
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*
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* @return
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*/
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EAPI Eina_Cpu_Features eina_cpu_features_get(void)
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{
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Eina_Cpu_Features ecf = 0;
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#if defined(__i386__) || defined(__x86_64__)
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_x86_simd(&ecf);
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#endif
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return ecf;
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}
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static int _cpu_count = -1;
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static int
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_eina_cpu_count_internal(void)
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{
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#ifdef EFL_HAVE_THREADS
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# if defined (_WIN32)
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SYSTEM_INFO sysinfo;
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GetSystemInfo(&sysinfo);
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return sysinfo.dwNumberOfProcessors;
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# elif defined (__sun) || defined(__GNU__) || defined(__CYGWIN__)
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/*
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* _SC_NPROCESSORS_ONLN: number of processors that are online, that
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is available when sysconf is called. The number
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of cpu can change by admins.
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* _SC_NPROCESSORS_CONF: maximum number of processors that are available
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to the current OS instance. That number can be
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change after a reboot.
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* _SC_NPROCESSORS_MAX : maximum number of processors that are on the
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motherboard.
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*/
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return sysconf(_SC_NPROCESSORS_ONLN);
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# elif defined (__FreeBSD__) || defined (__OpenBSD__) || \
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defined (__NetBSD__) || defined (__DragonFly__) || defined (__MacOSX__) || \
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(defined (__MACH__) && defined (__APPLE__))
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int mib[4];
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int cpus;
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size_t len = sizeof(cpus);
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mib[0] = CTL_HW;
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#ifdef HW_AVAILCPU
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mib[1] = HW_AVAILCPU;
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#else
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mib[1] = HW_NCPU;
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#endif
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sysctl(mib, 2, &cpus, &len, NULL, 0);
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if (cpus < 1)
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cpus = 1;
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return cpus;
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# elif defined (__linux__) || defined(__GLIBC__)
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cpu_set_t cpu;
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int i;
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static int cpus = 0;
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if (cpus != 0)
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return cpus;
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CPU_ZERO(&cpu);
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if (sched_getaffinity(0, sizeof(cpu), &cpu) != 0)
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{
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fprintf(stderr, "[Eina] could not get cpu affinity: %s\n",
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strerror(errno));
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return 1;
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}
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for (i = 0; i < TH_MAX; i++)
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{
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if (CPU_ISSET(i, &cpu))
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cpus = i + 1;
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else
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break;
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}
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return cpus;
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# else
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# error "eina_cpu_count() error: Platform not supported"
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# endif
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#else
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return 1;
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#endif
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}
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EAPI int eina_cpu_count(void)
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{
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return _cpu_count;
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}
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void eina_cpu_count_internal(void)
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{
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if (getenv("EINA_CPU_FAKE"))
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_cpu_count = atoi(getenv("EINA_CPU_FAKE"));
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else
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_cpu_count = _eina_cpu_count_internal();
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}
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