58 lines
2.7 KiB
C
58 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/dce.h"
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#include "libc/nexgen32e/cachesize.h"
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#include "libc/nexgen32e/cpuid4.internal.h"
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static unsigned getcachesize$cpuid4(int type, int level) {
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unsigned i, k;
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static int once;
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static unsigned char kCacheKey[8];
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static unsigned kCacheSize[8];
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if (!once) {
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CPUID4_ITERATE(i, {
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kCacheKey[i] = CPUID4_KEY;
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kCacheSize[i] = CPUID4_CACHE_SIZE_IN_BYTES;
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});
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once = 1;
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}
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k = ((level & 7) << 5) | (type & 31);
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for (i = 0; i < 8; ++i) {
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if (kCacheKey[i] == k) {
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return kCacheSize[i];
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}
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}
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return 0;
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}
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/**
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* Returns CPU cache size.
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*
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* @param type 1=data, 2=instruction, 3=unified
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* @param level starts at 1
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* @return size in bytes, or 0 if unknown
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*/
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unsigned getcachesize(int type, int level) {
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assert(1 <= type && type <= 3);
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assert(level >= 1);
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return getcachesize$cpuid4(type, level);
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}
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