pixman-mips.c revision 1176bdada62cabc6ec4b0308a930e83b679d5d36 
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
33static pixman_bool_t
34have_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
68pixman_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