mirror of https://github.com/yuzu-emu/yuzu.git
107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
// SPDX-FileCopyrightText: 2014 Citra Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "common/assert.h"
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#include "core/core.h"
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#include "core/hle/kernel/k_page_table.h"
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#include "core/hle/kernel/k_scoped_resource_reservation.h"
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#include "core/hle/kernel/k_shared_memory.h"
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#include "core/hle/kernel/k_system_resource.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/svc_results.h"
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namespace Kernel {
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KSharedMemory::KSharedMemory(KernelCore& kernel) : KAutoObjectWithSlabHeapAndContainer{kernel} {}
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KSharedMemory::~KSharedMemory() = default;
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Result KSharedMemory::Initialize(Core::DeviceMemory& device_memory, KProcess* owner_process,
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Svc::MemoryPermission owner_permission,
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Svc::MemoryPermission user_permission, std::size_t size) {
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// Set members.
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m_owner_process = owner_process;
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m_device_memory = std::addressof(device_memory);
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m_owner_permission = owner_permission;
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m_user_permission = user_permission;
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m_size = Common::AlignUp(size, PageSize);
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const size_t num_pages = Common::DivideUp(size, PageSize);
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// Get the resource limit.
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KResourceLimit* reslimit = m_kernel.GetSystemResourceLimit();
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// Reserve memory for ourselves.
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KScopedResourceReservation memory_reservation(reslimit, LimitableResource::PhysicalMemoryMax,
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size);
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R_UNLESS(memory_reservation.Succeeded(), ResultLimitReached);
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// Allocate the memory.
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//! HACK: Open continuous mapping from sysmodule pool.
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auto option = KMemoryManager::EncodeOption(KMemoryManager::Pool::Secure,
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KMemoryManager::Direction::FromBack);
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m_physical_address = m_kernel.MemoryManager().AllocateAndOpenContinuous(num_pages, 1, option);
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R_UNLESS(m_physical_address != 0, ResultOutOfMemory);
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//! Insert the result into our page group.
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m_page_group.emplace(m_kernel,
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std::addressof(m_kernel.GetSystemSystemResource().GetBlockInfoManager()));
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m_page_group->AddBlock(m_physical_address, num_pages);
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// Commit our reservation.
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memory_reservation.Commit();
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// Set our resource limit.
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m_resource_limit = reslimit;
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m_resource_limit->Open();
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// Mark initialized.
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m_is_initialized = true;
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// Clear all pages in the memory.
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for (const auto& block : *m_page_group) {
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std::memset(m_device_memory->GetPointer<void>(block.GetAddress()), 0, block.GetSize());
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}
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R_SUCCEED();
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}
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void KSharedMemory::Finalize() {
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// Close and finalize the page group.
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m_page_group->Close();
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m_page_group->Finalize();
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// Release the memory reservation.
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m_resource_limit->Release(LimitableResource::PhysicalMemoryMax, m_size);
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m_resource_limit->Close();
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}
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Result KSharedMemory::Map(KProcess& target_process, KProcessAddress address, std::size_t map_size,
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Svc::MemoryPermission map_perm) {
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// Validate the size.
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R_UNLESS(m_size == map_size, ResultInvalidSize);
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// Validate the permission.
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const Svc::MemoryPermission test_perm =
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std::addressof(target_process) == m_owner_process ? m_owner_permission : m_user_permission;
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if (test_perm == Svc::MemoryPermission::DontCare) {
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ASSERT(map_perm == Svc::MemoryPermission::Read || map_perm == Svc::MemoryPermission::Write);
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} else {
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R_UNLESS(map_perm == test_perm, ResultInvalidNewMemoryPermission);
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}
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R_RETURN(target_process.GetPageTable().MapPageGroup(
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address, *m_page_group, KMemoryState::Shared, ConvertToKMemoryPermission(map_perm)));
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}
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Result KSharedMemory::Unmap(KProcess& target_process, KProcessAddress address,
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std::size_t unmap_size) {
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// Validate the size.
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R_UNLESS(m_size == unmap_size, ResultInvalidSize);
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R_RETURN(
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target_process.GetPageTable().UnmapPageGroup(address, *m_page_group, KMemoryState::Shared));
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}
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} // namespace Kernel
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