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riscv: Get cache information through sysconf

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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 <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Zong Li 2020-10-30 01:33:38 +08:00 committed by DJ Delorie
parent 1f67f23fdf
commit 15b38ffc10
1 changed files with 100 additions and 0 deletions
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sysdeps/unix/sysv/linux/riscv/sysconf.c Normal file
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/* 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>