1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/* Get system-specific information at run-time. Linux/powerpc version.
Copyright (C) 2017-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <sys/auxv.h>
static long linux_sysconf (int name);
static inline long
auxv2sysconf_cache_associativity (unsigned long type)
{
return (__getauxval (type) & 0xffff0000) >> 16;
}
static inline long
auxv2sysconf_cache_linesize (unsigned long type)
{
return __getauxval (type) & 0xffff;
}
/* Get the value of the system variable NAME. */
long int
__sysconf (int name)
{
switch (name)
{
case _SC_LEVEL1_ICACHE_SIZE:
return __getauxval (AT_L1I_CACHESIZE);
case _SC_LEVEL1_ICACHE_ASSOC:
return auxv2sysconf_cache_associativity (AT_L1I_CACHEGEOMETRY);
case _SC_LEVEL1_ICACHE_LINESIZE:
return auxv2sysconf_cache_linesize (AT_L1I_CACHEGEOMETRY);
case _SC_LEVEL1_DCACHE_SIZE:
return __getauxval (AT_L1D_CACHESIZE);
case _SC_LEVEL1_DCACHE_ASSOC:
return auxv2sysconf_cache_associativity (AT_L1D_CACHEGEOMETRY);
case _SC_LEVEL1_DCACHE_LINESIZE:
return auxv2sysconf_cache_linesize (AT_L1D_CACHEGEOMETRY);
case _SC_LEVEL2_CACHE_SIZE:
return __getauxval (AT_L2_CACHESIZE);
case _SC_LEVEL2_CACHE_ASSOC:
return auxv2sysconf_cache_associativity (AT_L2_CACHEGEOMETRY);
case _SC_LEVEL2_CACHE_LINESIZE:
return auxv2sysconf_cache_linesize (AT_L2_CACHEGEOMETRY);
case _SC_LEVEL3_CACHE_SIZE:
return __getauxval (AT_L3_CACHESIZE);
case _SC_LEVEL3_CACHE_ASSOC:
return auxv2sysconf_cache_associativity (AT_L3_CACHEGEOMETRY);
case _SC_LEVEL3_CACHE_LINESIZE:
return auxv2sysconf_cache_linesize (AT_L3_CACHEGEOMETRY);
default:
return linux_sysconf (name);
}
}
/* Now the generic Linux version. */
#undef __sysconf
#define __sysconf static linux_sysconf
#include "../sysconf.c"
|
