diff options
| -rw-r--r-- | sysdeps/unix/sysv/linux/riscv/sysconf.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/riscv/sysconf.c b/sysdeps/unix/sysv/linux/riscv/sysconf.c new file mode 100644 index 0000000000..02b469cc65 --- /dev/null +++ b/sysdeps/unix/sysv/linux/riscv/sysconf.c @@ -0,0 +1,100 @@ +/* Copyright (C) 2020 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 int linux_sysconf (int name); + +static inline bool +getauxval2_einval (unsigned long int type, unsigned long int *result) +{ + if (__getauxval2 (type, result)) + return true; + + __set_errno (EINVAL); + + return false; +} + +static inline long int +sysconf_get_cache_associativity (unsigned long type) +{ + unsigned long int result; + + if (getauxval2_einval (type, &result)) + return (result & 0xffff0000) >> 16; + + return -1; +} + +static inline long int +sysconf_get_cache_linesize (unsigned long type) +{ + unsigned long int result; + + if (getauxval2_einval (type, &result)) + return result & 0xffff; + + return -1; +} + +static inline long int +sysconf_get_cache_size (unsigned long type) +{ + unsigned long int result; + + if (getauxval2_einval (type, &result)) + return result; + + return -1; +} + +/* Get the value of the system variable NAME. */ +long int +__sysconf (int name) +{ + switch (name) + { + case _SC_LEVEL1_ICACHE_SIZE: + return sysconf_get_cache_size (AT_L1I_CACHESIZE); + case _SC_LEVEL1_ICACHE_ASSOC: + return sysconf_get_cache_associativity (AT_L1I_CACHEGEOMETRY); + case _SC_LEVEL1_ICACHE_LINESIZE: + return sysconf_get_cache_linesize (AT_L1I_CACHEGEOMETRY); + case _SC_LEVEL1_DCACHE_SIZE: + return sysconf_get_cache_size (AT_L1D_CACHESIZE); + case _SC_LEVEL1_DCACHE_ASSOC: + return sysconf_get_cache_associativity (AT_L1D_CACHEGEOMETRY); + case _SC_LEVEL1_DCACHE_LINESIZE: + return sysconf_get_cache_linesize (AT_L1D_CACHEGEOMETRY); + case _SC_LEVEL2_CACHE_SIZE: + return sysconf_get_cache_size (AT_L2_CACHESIZE); + case _SC_LEVEL2_CACHE_ASSOC: + return sysconf_get_cache_associativity (AT_L2_CACHEGEOMETRY); + case _SC_LEVEL2_CACHE_LINESIZE: + return sysconf_get_cache_linesize (AT_L2_CACHEGEOMETRY); + default: + return linux_sysconf (name); + } +} + +/* Now the generic Linux version. */ +#undef __sysconf +#define __sysconf static linux_sysconf +#include <sysdeps/unix/sysv/linux/sysconf.c> |