The Tor Browser: gfx/cairo/libpixman/src/pixman-mips.c@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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

    26 #include "pixman-private.h"

    28 #if defined(USE_MIPS_DSPR2) || defined(USE_LOONGSON_MMI)

    30 #include <string.h>

    31 #include <stdlib.h>

    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;

    47     if ((f = fopen (file_name, "r")) == NULL)

    48         return FALSE;

    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     }

    59     fclose (f);

    60 #endif

    62     /* Did not find string in the proc file, or not Linux ELF. */

    63     return FALSE;

    64 }

    66 #endif

    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

    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

    93     return imp;

    94 }

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