/*
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* Copyright (C) 2011 Gilles Chanteperdrix <gch@xenomai.org>.
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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 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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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <string.h>
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#include <unistd.h>
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#include <limits.h>
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#include <cobalt/wrappers.h>
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#include <cobalt/ticks.h>
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#include <asm/xenomai/syscall.h>
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#include <asm/xenomai/tsc.h>
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#include <asm/xenomai/features.h>
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#include <asm/xenomai/uapi/fptest.h>
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#include "internal.h"
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struct __xn_full_tscinfo __xn_tscinfo = {
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.kinfo = {
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.counter = NULL,
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},
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};
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void cobalt_arch_check_features(struct cobalt_featinfo *finfo)
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{
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unsigned long phys_addr;
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unsigned page_size;
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int err, fd;
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void *addr;
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if (!cobalt_use_legacy_tsc())
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return;
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if (__xn_tscinfo.kinfo.counter != NULL)
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return;
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err = XENOMAI_SYSCALL2(sc_cobalt_archcall,
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XENOMAI_SYSARCH_TSCINFO, &__xn_tscinfo.kinfo);
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if (err)
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early_panic("missing TSC emulation: %s",
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strerror(-err));
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fd = __STD(open("/dev/mem", O_RDONLY | O_SYNC));
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if (fd == -1)
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early_panic("failed open(/dev/mem): %s", strerror(errno));
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page_size = sysconf(_SC_PAGESIZE);
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phys_addr = (unsigned long)__xn_tscinfo.kinfo.counter;
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addr = __STD(mmap(NULL, page_size, PROT_READ, MAP_SHARED,
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fd, phys_addr & ~(page_size - 1)));
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if (addr == MAP_FAILED)
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early_panic("failed mmap(/dev/mem): %s", strerror(errno));
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__xn_tscinfo.kinfo.counter =
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((volatile unsigned *)
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((char *) addr + (phys_addr & (page_size - 1))));
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__STD(close(fd));
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}
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int cobalt_fp_detect(void)
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{
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char buffer[1024];
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int features = 0;
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FILE *fp;
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fp = fopen("/proc/cpuinfo", "r");
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if (fp == NULL)
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return 0;
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while (fgets(buffer, sizeof(buffer), fp)) {
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if(strncmp(buffer, "Features", sizeof("Features") - 1))
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continue;
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if (strstr(buffer, "fp")) {
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features |= __COBALT_HAVE_FPU;
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break;
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}
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}
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fclose(fp);
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return features;
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}
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