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1 /*
2  * Copyright © 2019, VideoLAN and dav1d authors
3  * Copyright © 2019, Janne Grunau
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright notice, this
10  *    list of conditions and the following disclaimer.
11  *
12  * 2. Redistributions in binary form must reproduce the above copyright notice,
13  *    this list of conditions and the following disclaimer in the documentation
14  *    and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 
28 #include "config.h"
29 
30 #include "common/attributes.h"
31 
32 #include "src/ppc/cpu.h"
33 
34 #if (defined(HAVE_GETAUXVAL) || defined(HAVE_ELF_AUX_INFO)) && ARCH_PPC64LE
35 #include <sys/auxv.h>
36 #define HAVE_AUX
37 #endif
38 
dav1d_get_cpu_flags_ppc(void)39 COLD unsigned dav1d_get_cpu_flags_ppc(void) {
40     unsigned flags = 0;
41 #if defined(HAVE_GETAUXVAL) && ARCH_PPC64LE
42     unsigned long hw_cap = getauxval(AT_HWCAP);
43     unsigned long hw_cap2 = getauxval(AT_HWCAP2);
44 #elif defined(HAVE_ELF_AUX_INFO) && ARCH_PPC64LE
45     unsigned long hw_cap = 0;
46     unsigned long hw_cap2 = 0;
47     elf_aux_info(AT_HWCAP, &hw_cap, sizeof(hw_cap));
48     elf_aux_info(AT_HWCAP2, &hw_cap2, sizeof(hw_cap2));
49 #endif
50 #ifdef HAVE_AUX
51     flags |= (hw_cap & PPC_FEATURE_HAS_VSX) ? DAV1D_PPC_CPU_FLAG_VSX : 0;
52     flags |= (hw_cap2 & PPC_FEATURE2_ARCH_3_00) ? DAV1D_PPC_CPU_FLAG_PWR9 : 0;
53 #endif
54     return flags;
55 }
56