135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/*
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*
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* Copyright 2022 Google LLC
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <arch/cache.h>
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#include <arch/cpuid.h>
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unsigned int dcache_line_bytes(void)
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{
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/*
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* The value returned in EBX[15:8] is in 8-byte increments.
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* Cache line size is EBX[15:8] * 8
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*/
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return (cpuid_ebx(1) & 0xff00) >> 5;
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}
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static inline int cpu_supports_wbnoinvd(void)
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{
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return (cpuid_ebx(0x80000008) >> 9) & 1;
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}
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static inline int cpu_supports_clwb(void)
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{
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return (cpuid_ebx(7) >> 24) & 1;
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}
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static inline int cpu_supports_clflushopt(void)
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{
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return (cpuid_sub_leaf_ebx(7, 0) >> 23) & 1;
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}
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static inline int cpu_supports_clflush(void)
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{
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return (cpuid_ebx(1) >> 19) & 1;
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}
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inline void dcache_invalidate_all(void)
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{
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asm volatile("invd" ::: "memory");
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}
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inline void dcache_clean_invalidate_all(void)
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{
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asm volatile("wbinvd" ::: "memory");
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}
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inline void dcache_clean_all(void)
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{
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if (cpu_supports_wbnoinvd()) {
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asm volatile(
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"sfence\n\t"
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"wbnoinvd\n\t"
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::: "memory");
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} else {
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dcache_clean_invalidate_all();
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}
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}
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void dcache_clean_by_mva(void const *addr, size_t len)
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{
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unsigned long line, linesize;
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linesize = dcache_line_bytes();
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line = (uintptr_t)addr & ~(linesize - 1);
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if (cpu_supports_clwb()) {
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asm volatile("sfence");
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while (line < (uintptr_t)addr + len) {
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asm volatile("clwb (%0)" : : "r"(line) : "memory");
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line += linesize;
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}
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} else {
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dcache_clean_invalidate_by_mva(addr, len);
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}
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}
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void dcache_invalidate_by_mva(void const *addr, size_t len)
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{
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/*
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* x86 doesn't have a "invalidate without clean" for a cache line, fall
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* back to both.
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*/
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dcache_clean_invalidate_by_mva(addr, len);
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}
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void dcache_clean_invalidate_by_mva(void const *addr, size_t len)
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{
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unsigned long line, linesize;
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linesize = dcache_line_bytes();
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line = (uintptr_t)addr & ~(linesize - 1);
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if (cpu_supports_clflushopt()) {
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asm volatile("sfence");
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while (line < (uintptr_t)addr + len) {
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asm volatile("clflushopt (%0)" ::"r"(line) : "memory");
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line += linesize;
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}
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} else if (cpu_supports_clflush()) {
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asm volatile("sfence");
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while (line < (uintptr_t)addr + len) {
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asm volatile("clflush (%0)" : : "r"(line) : "memory");
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line += linesize;
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}
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} else {
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dcache_clean_invalidate_all();
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}
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}
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