From 15b38ffc104a30f5c02ed33c5983923d5ceae5f8 Mon Sep 17 00:00:00 2001 From: Zong Li Date: Fri, 30 Oct 2020 01:33:38 +0800 Subject: riscv: Get cache information through sysconf Add support to query cache information on RISC-V through sysconf() function. The cache information had been added in AUX vector of RISC-V architecture in Linux kernel v.5.10-rc1. Reviewed-by: Palmer Dabbelt Acked-by: Palmer Dabbelt --- sysdeps/unix/sysv/linux/riscv/sysconf.c | 100 ++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/riscv/sysconf.c 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 + . */ + +#include +#include +#include + +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 -- cgit 1.4.1