mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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157 lines
5.7 KiB
C++
157 lines
5.7 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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#include <stratosphere.hpp>
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#include "impl/os_thread_manager.hpp"
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#include "impl/os_shared_memory_impl.hpp"
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namespace ams::os {
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namespace {
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void SetupSharedMemoryType(SharedMemoryType *shared_memory, size_t size, NativeHandle handle, bool managed) {
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/* Set members. */
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shared_memory->handle = handle;
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shared_memory->size = size;
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shared_memory->address = nullptr;
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shared_memory->allocated = false;
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/* Set managed. */
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shared_memory->handle_managed = managed;
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/* Create the critical section. */
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util::ConstructAt(shared_memory->cs_shared_memory);
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}
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}
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Result CreateSharedMemory(SharedMemoryType *shared_memory, size_t size, MemoryPermission my_perm, MemoryPermission other_perm) {
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/* Check pre-conditions. */
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AMS_ASSERT(size > 0);
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AMS_ASSERT(util::IsAligned(size, MemoryPageSize));
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/* Create the memory. */
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NativeHandle handle;
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R_TRY(impl::SharedMemoryImpl::Create(std::addressof(handle), size, my_perm, other_perm));
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/* Setup the object. */
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SetupSharedMemoryType(shared_memory, size, handle, true);
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return ResultSuccess();
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}
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void AttachSharedMemory(SharedMemoryType *shared_memory, size_t size, NativeHandle handle, bool managed) {
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/* Check pre-conditions. */
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AMS_ASSERT(size > 0);
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AMS_ASSERT(util::IsAligned(size, MemoryPageSize));
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AMS_ASSERT(handle != os::InvalidNativeHandle);
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/* Setup the object. */
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SetupSharedMemoryType(shared_memory, size, handle, managed);
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}
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void DestroySharedMemory(SharedMemoryType *shared_memory) {
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/* Unmap the shared memory, if required. */
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if (shared_memory->state == SharedMemoryType::State_Mapped) {
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UnmapSharedMemory(shared_memory);
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}
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/* Check the state. */
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AMS_ASSERT(shared_memory->state == SharedMemoryType::State_Initialized);
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/* Set state to not initialized. */
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shared_memory->state = SharedMemoryType::State_NotInitialized;
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/* Close the handle, if it's managed. */
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if (shared_memory->handle_managed) {
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impl::SharedMemoryImpl::Close(shared_memory->handle);
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}
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shared_memory->handle_managed = false;
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/* Clear members. */
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shared_memory->address = nullptr;
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shared_memory->size = 0;
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shared_memory->handle = os::InvalidNativeHandle;
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/* Destroy the critical section. */
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util::DestroyAt(shared_memory->cs_shared_memory);
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}
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void *MapSharedMemory(SharedMemoryType *shared_memory, MemoryPermission perm) {
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/* Lock the current thread, and then the shared memory. */
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std::scoped_lock thread_lk(util::GetReference(impl::GetCurrentThread()->cs_thread));
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std::scoped_lock lk(util::GetReference(shared_memory->cs_shared_memory));
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/* Ensure we're in a mappable state. */
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AMS_ASSERT(shared_memory->state == SharedMemoryType::State_Initialized);
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/* Try to map. */
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void *mapped_address;
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if (R_FAILED(impl::SharedMemoryImpl::Map(std::addressof(mapped_address), shared_memory->handle, shared_memory->size, perm))) {
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return nullptr;
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}
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/* Set fields now that we've mapped successfully. */
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shared_memory->allocated = true;
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shared_memory->address = mapped_address;
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shared_memory->state = SharedMemoryType::State_Mapped;
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return mapped_address;
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}
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void UnmapSharedMemory(SharedMemoryType *shared_memory) {
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/* Lock the memory. */
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std::scoped_lock lk(util::GetReference(shared_memory->cs_shared_memory));
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/* If the memory isn't mapped, we can't unmap it. */
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if (shared_memory->state != SharedMemoryType::State_Mapped) {
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return;
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}
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/* Unmap the memory. */
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impl::SharedMemoryImpl::Unmap(shared_memory->handle, shared_memory->address, shared_memory->size);
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/* Unmapped memory is necessarily not allocated. */
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if (shared_memory->allocated) {
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shared_memory->allocated = false;
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}
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/* Clear the address. */
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shared_memory->address = nullptr;
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shared_memory->state = SharedMemoryType::State_Initialized;
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}
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void *GetSharedMemoryAddress(const SharedMemoryType *shared_memory) {
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/* Check pre-conditions. */
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AMS_ASSERT(shared_memory->state == SharedMemoryType::State_Initialized || shared_memory->state == SharedMemoryType::State_Mapped);
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return shared_memory->address;
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}
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size_t GetSharedMemorySize(const SharedMemoryType *shared_memory) {
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/* Check pre-conditions. */
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AMS_ASSERT(shared_memory->state == SharedMemoryType::State_Initialized || shared_memory->state == SharedMemoryType::State_Mapped);
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return shared_memory->size;
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}
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NativeHandle GetSharedMemoryHandle(const SharedMemoryType *shared_memory) {
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/* Check pre-conditions. */
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AMS_ASSERT(shared_memory->state == SharedMemoryType::State_Initialized || shared_memory->state == SharedMemoryType::State_Mapped);
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return shared_memory->handle;
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}
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}
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