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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright 2017, Michael Ellerman, IBM Corp. */
#include <elf.h>#include <errno.h>#include <fcntl.h>#include <link.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/stat.h>#include <sys/types.h>#include <sys/wait.h>#include <unistd.h>
#include "utils.h"
#ifndef AT_L1I_CACHESIZE#define AT_L1I_CACHESIZE 40#define AT_L1I_CACHEGEOMETRY 41#define AT_L1D_CACHESIZE 42#define AT_L1D_CACHEGEOMETRY 43#define AT_L2_CACHESIZE 44#define AT_L2_CACHEGEOMETRY 45#define AT_L3_CACHESIZE 46#define AT_L3_CACHEGEOMETRY 47#endif
static void print_size(const char *label, uint32_t val){ printf("%s cache size: %#10x %10dB %10dK\n", label, val, val, val / 1024);}
static void print_geo(const char *label, uint32_t val){ uint16_t assoc;
printf("%s line size: %#10x ", label, val & 0xFFFF);
assoc = val >> 16; if (assoc) printf("%u-way", assoc); else printf("fully");
printf(" associative\n");}
static int test_cache_shape(){ static char buffer[4096]; ElfW(auxv_t) *p; int found;
FAIL_IF(read_auxv(buffer, sizeof(buffer)));
found = 0;
p = find_auxv_entry(AT_L1I_CACHESIZE, buffer); if (p) { found++; print_size("L1I ", (uint32_t)p->a_un.a_val); }
p = find_auxv_entry(AT_L1I_CACHEGEOMETRY, buffer); if (p) { found++; print_geo("L1I ", (uint32_t)p->a_un.a_val); }
p = find_auxv_entry(AT_L1D_CACHESIZE, buffer); if (p) { found++; print_size("L1D ", (uint32_t)p->a_un.a_val); }
p = find_auxv_entry(AT_L1D_CACHEGEOMETRY, buffer); if (p) { found++; print_geo("L1D ", (uint32_t)p->a_un.a_val); }
p = find_auxv_entry(AT_L2_CACHESIZE, buffer); if (p) { found++; print_size("L2 ", (uint32_t)p->a_un.a_val); }
p = find_auxv_entry(AT_L2_CACHEGEOMETRY, buffer); if (p) { found++; print_geo("L2 ", (uint32_t)p->a_un.a_val); }
p = find_auxv_entry(AT_L3_CACHESIZE, buffer); if (p) { found++; print_size("L3 ", (uint32_t)p->a_un.a_val); }
p = find_auxv_entry(AT_L3_CACHEGEOMETRY, buffer); if (p) { found++; print_geo("L3 ", (uint32_t)p->a_un.a_val); }
/* If we found none we're probably on a system where they don't exist */ SKIP_IF(found == 0);
/* But if we found any, we expect to find them all */ FAIL_IF(found != 8);
return 0;}
int main(void){ return test_harness(test_cache_shape, "cache_shape");}