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      1 /*
      2  * Copyright  2000 SuSE, Inc.
      3  * Copyright  2007 Red Hat, Inc.
      4  *
      5  * Permission to use, copy, modify, distribute, and sell this software and its
      6  * documentation for any purpose is hereby granted without fee, provided that
      7  * the above copyright notice appear in all copies and that both that
      8  * copyright notice and this permission notice appear in supporting
      9  * documentation, and that the name of SuSE not be used in advertising or
     10  * publicity pertaining to distribution of the software without specific,
     11  * written prior permission.  SuSE makes no representations about the
     12  * suitability of this software for any purpose.  It is provided "as is"
     13  * without express or implied warranty.
     14  *
     15  * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
     17  * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     18  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
     19  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     20  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     21  */
     22 #ifdef HAVE_CONFIG_H
     23 #include <config.h>
     24 #endif
     25 
     26 #include "pixman-private.h"
     27 
     28 #if defined(USE_MIPS_DSPR2) || defined(USE_LOONGSON_MMI)
     29 
     30 #include <string.h>
     31 #include <stdlib.h>
     32 
     33 static pixman_bool_t
     34 have_feature (const char *search_string)
     35 {
     36 #if defined (__linux__) /* linux ELF */
     37     /* Simple detection of MIPS features at runtime for Linux.
     38      * It is based on /proc/cpuinfo, which reveals hardware configuration
     39      * to user-space applications.  According to MIPS (early 2010), no similar
     40      * facility is universally available on the MIPS architectures, so it's up
     41      * to individual OSes to provide such.
     42      */
     43     const char *file_name = "/proc/cpuinfo";
     44     char cpuinfo_line[256];
     45     FILE *f = NULL;
     46 
     47     if ((f = fopen (file_name, "r")) == NULL)
     48         return FALSE;
     49 
     50     while (fgets (cpuinfo_line, sizeof (cpuinfo_line), f) != NULL)
     51     {
     52         if (strstr (cpuinfo_line, search_string) != NULL)
     53         {
     54             fclose (f);
     55             return TRUE;
     56         }
     57     }
     58 
     59     fclose (f);
     60 #endif
     61 
     62     /* Did not find string in the proc file, or not Linux ELF. */
     63     return FALSE;
     64 }
     65 
     66 #endif
     67 
     68 pixman_implementation_t *
     69 _pixman_mips_get_implementations (pixman_implementation_t *imp)
     70 {
     71 #ifdef USE_LOONGSON_MMI
     72     /* I really don't know if some Loongson CPUs don't have MMI. */
     73     if (!_pixman_disabled ("loongson-mmi") && have_feature ("Loongson"))
     74 	imp = _pixman_implementation_create_mmx (imp);
     75 #endif
     76 
     77 #ifdef USE_MIPS_DSPR2
     78     if (!_pixman_disabled ("mips-dspr2"))
     79     {
     80 	int already_compiling_everything_for_dspr2 = 0;
     81 #if defined(__mips_dsp) && (__mips_dsp_rev >= 2)
     82 	already_compiling_everything_for_dspr2 = 1;
     83 #endif
     84 	if (already_compiling_everything_for_dspr2 ||
     85 	    /* Only currently available MIPS core that supports DSPr2 is 74K. */
     86 	    have_feature ("MIPS 74K"))
     87 	{
     88 	    imp = _pixman_implementation_create_mips_dspr2 (imp);
     89 	}
     90     }
     91 #endif
     92 
     93     return imp;
     94 }
     95