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// SPDX-FileCopyrightText: 2014 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/assert.h"
#include "core/core.h"
#include "core/hle/kernel/k_page_table.h"
#include "core/hle/kernel/k_scoped_resource_reservation.h"
#include "core/hle/kernel/k_shared_memory.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/svc_results.h"
namespace Kernel {
KSharedMemory::KSharedMemory(KernelCore& kernel_) : KAutoObjectWithSlabHeapAndContainer{kernel_} {}
KSharedMemory::~KSharedMemory() {
kernel.GetSystemResourceLimit()->Release(LimitableResource::PhysicalMemory, size);
}
Result KSharedMemory::Initialize(Core::DeviceMemory& device_memory_, KProcess* owner_process_,
KPageGroup&& page_list_, Svc::MemoryPermission owner_permission_,
Svc::MemoryPermission user_permission_, PAddr physical_address_,
std::size_t size_, std::string name_) {
// Set members.
owner_process = owner_process_;
device_memory = &device_memory_;
page_list = std::move(page_list_);
owner_permission = owner_permission_;
user_permission = user_permission_;
physical_address = physical_address_;
size = size_;
name = std::move(name_);
// Get the resource limit.
KResourceLimit* reslimit = kernel.GetSystemResourceLimit();
// Reserve memory for ourselves.
KScopedResourceReservation memory_reservation(reslimit, LimitableResource::PhysicalMemory,
size_);
R_UNLESS(memory_reservation.Succeeded(), ResultLimitReached);
// Commit our reservation.
memory_reservation.Commit();
// Set our resource limit.
resource_limit = reslimit;
resource_limit->Open();
// Mark initialized.
is_initialized = true;
// Clear all pages in the memory.
std::memset(device_memory_.GetPointer(physical_address_), 0, size_);
return ResultSuccess;
}
void KSharedMemory::Finalize() {
// Release the memory reservation.
resource_limit->Release(LimitableResource::PhysicalMemory, size);
resource_limit->Close();
// Perform inherited finalization.
KAutoObjectWithSlabHeapAndContainer<KSharedMemory, KAutoObjectWithList>::Finalize();
}
Result KSharedMemory::Map(KProcess& target_process, VAddr address, std::size_t map_size,
Svc::MemoryPermission permissions) {
const u64 page_count{(map_size + PageSize - 1) / PageSize};
if (page_list.GetNumPages() != page_count) {
UNIMPLEMENTED_MSG("Page count does not match");
}
const Svc::MemoryPermission expected =
&target_process == owner_process ? owner_permission : user_permission;
if (permissions != expected) {
UNIMPLEMENTED_MSG("Permission does not match");
}
return target_process.PageTable().MapPages(address, page_list, KMemoryState::Shared,
ConvertToKMemoryPermission(permissions));
}
Result KSharedMemory::Unmap(KProcess& target_process, VAddr address, std::size_t unmap_size) {
const u64 page_count{(unmap_size + PageSize - 1) / PageSize};
if (page_list.GetNumPages() != page_count) {
UNIMPLEMENTED_MSG("Page count does not match");
}
return target_process.PageTable().UnmapPages(address, page_list, KMemoryState::Shared);
}
} // namespace Kernel
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