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https://github.com/Atmosphere-NX/Atmosphere-libs.git
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61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stratosphere.hpp>
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namespace ams::os::impl {
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inline void FlushDataCacheImpl(const void *addr, size_t size) {
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#if defined(ATMOSPHERE_ARCH_ARM64)
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{
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/* Declare helper variables. */
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uintptr_t cache_type_register = 0;
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uintptr_t cache_line_size = 0;
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const uintptr_t end_addr = reinterpret_cast<uintptr_t>(addr) + size;
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/* Get the cache type register. */
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__asm__ __volatile__("mrs %[cache_type_register], ctr_el0" : [cache_type_register]"=r"(cache_type_register));
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/* Calculate cache line size. */
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cache_line_size = 4 << ((cache_type_register >> 16) & 0xF);
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/* Get the thread local region. */
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auto * const tlr = svc::GetThreadLocalRegion();
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/* Note to the kernel that we're performing cache maintenance, in case we get interrupted while touching cache lines. */
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tlr->cache_maintenance_flag = 1;
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ON_SCOPE_EXIT { tlr->cache_maintenance_flag = 0; };
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/* Iterate, flushing cache lines. */
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for (uintptr_t cur = reinterpret_cast<uintptr_t>(addr) & ~(cache_line_size - 1); cur < end_addr; cur += cache_line_size) {
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__asm__ __volatile__ ("dc civac, %[cur]" :: [cur]"r"(cur));
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}
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/* Insert a memory barrier, now that memory has been flushed. */
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__asm__ __volatile__("dsb sy" ::: "memory");
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}
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#else
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const auto result = svc::FlushProcessDataCache(svc::PseudoHandle::CurrentProcess, reinterpret_cast<uintptr_t>(addr), size);
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R_ASSERT(result);
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AMS_UNUSED(result);
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#endif
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}
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inline void FlushEntireDataCacheImpl() {
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svc::FlushEntireDataCache();
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}
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} |