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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "core/core.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/memory/page_table.h"
namespace Kernel {
KSharedMemory::KSharedMemory(KernelCore& kernel, Core::DeviceMemory& device_memory)
: Object{kernel}, device_memory{device_memory} {}
KSharedMemory::~KSharedMemory() {
kernel.GetSystemResourceLimit()->Release(LimitableResource::PhysicalMemory, size);
}
std::shared_ptr<KSharedMemory> KSharedMemory::Create(
KernelCore& kernel, Core::DeviceMemory& device_memory, Process* owner_process,
Memory::PageLinkedList&& page_list, Memory::MemoryPermission owner_permission,
Memory::MemoryPermission user_permission, PAddr physical_address, std::size_t size,
std::string name) {
const auto resource_limit = kernel.GetSystemResourceLimit();
KScopedResourceReservation memory_reservation(resource_limit, LimitableResource::PhysicalMemory,
size);
ASSERT(memory_reservation.Succeeded());
std::shared_ptr<KSharedMemory> shared_memory{
std::make_shared<KSharedMemory>(kernel, device_memory)};
shared_memory->owner_process = owner_process;
shared_memory->page_list = std::move(page_list);
shared_memory->owner_permission = owner_permission;
shared_memory->user_permission = user_permission;
shared_memory->physical_address = physical_address;
shared_memory->size = size;
shared_memory->name = name;
memory_reservation.Commit();
return shared_memory;
}
ResultCode KSharedMemory::Map(Process& target_process, VAddr address, std::size_t size,
Memory::MemoryPermission permissions) {
const u64 page_count{(size + Memory::PageSize - 1) / Memory::PageSize};
if (page_list.GetNumPages() != page_count) {
UNIMPLEMENTED_MSG("Page count does not match");
}
const Memory::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, Memory::MemoryState::Shared,
permissions);
}
} // namespace Kernel
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