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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cstring>
#include "common/logging/log.h"
#include "core/memory.h"
#include "core/hle/kernel/memory.h"
#include "core/hle/kernel/shared_memory.h"
namespace Kernel {
SharedMemory::SharedMemory() {}
SharedMemory::~SharedMemory() {}
SharedPtr<SharedMemory> SharedMemory::Create(SharedPtr<Process> owner_process, u32 size, MemoryPermission permissions,
MemoryPermission other_permissions, VAddr address, MemoryRegion region, std::string name) {
SharedPtr<SharedMemory> shared_memory(new SharedMemory);
shared_memory->owner_process = owner_process;
shared_memory->name = std::move(name);
shared_memory->size = size;
shared_memory->permissions = permissions;
shared_memory->other_permissions = other_permissions;
if (address == 0) {
// We need to allocate a block from the Linear Heap ourselves.
// We'll manually allocate some memory from the linear heap in the specified region.
MemoryRegionInfo* memory_region = GetMemoryRegion(region);
auto& linheap_memory = memory_region->linear_heap_memory;
ASSERT_MSG(linheap_memory->size() + size <= memory_region->size, "Not enough space in region to allocate shared memory!");
shared_memory->backing_block = linheap_memory;
shared_memory->backing_block_offset = linheap_memory->size();
// Allocate some memory from the end of the linear heap for this region.
linheap_memory->insert(linheap_memory->end(), size, 0);
memory_region->used += size;
shared_memory->linear_heap_phys_address = Memory::FCRAM_PADDR + memory_region->base + shared_memory->backing_block_offset;
// Refresh the address mappings for the current process.
if (Kernel::g_current_process != nullptr) {
Kernel::g_current_process->vm_manager.RefreshMemoryBlockMappings(linheap_memory.get());
}
} else {
// TODO(Subv): What happens if an application tries to create multiple memory blocks pointing to the same address?
auto& vm_manager = shared_memory->owner_process->vm_manager;
// The memory is already available and mapped in the owner process.
auto vma = vm_manager.FindVMA(address)->second;
// Copy it over to our own storage
shared_memory->backing_block = std::make_shared<std::vector<u8>>(vma.backing_block->data() + vma.offset,
vma.backing_block->data() + vma.offset + size);
// Unmap the existing pages
vm_manager.UnmapRange(address, size);
// Map our own block into the address space
vm_manager.MapMemoryBlock(address, shared_memory->backing_block, 0, size, MemoryState::Shared);
// Reprotect the block with the new permissions
vm_manager.ReprotectRange(address, size, ConvertPermissions(permissions));
}
shared_memory->base_address = address;
return shared_memory;
}
ResultCode SharedMemory::Map(Process* target_process, VAddr address, MemoryPermission permissions,
MemoryPermission other_permissions) {
MemoryPermission own_other_permissions = target_process == owner_process ? this->permissions : this->other_permissions;
// Automatically allocated memory blocks can only be mapped with other_permissions = DontCare
if (base_address == 0 && other_permissions != MemoryPermission::DontCare) {
return ResultCode(ErrorDescription::InvalidCombination, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage);
}
// Error out if the requested permissions don't match what the creator process allows.
if (static_cast<u32>(permissions) & ~static_cast<u32>(own_other_permissions)) {
LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X name=%s, permissions don't match",
GetObjectId(), address, name.c_str());
return ResultCode(ErrorDescription::InvalidCombination, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage);
}
// Heap-backed memory blocks can not be mapped with other_permissions = DontCare
if (base_address != 0 && other_permissions == MemoryPermission::DontCare) {
LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X name=%s, permissions don't match",
GetObjectId(), address, name.c_str());
return ResultCode(ErrorDescription::InvalidCombination, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage);
}
// Error out if the provided permissions are not compatible with what the creator process needs.
if (other_permissions != MemoryPermission::DontCare &&
static_cast<u32>(this->permissions) & ~static_cast<u32>(other_permissions)) {
LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X name=%s, permissions don't match",
GetObjectId(), address, name.c_str());
return ResultCode(ErrorDescription::WrongPermission, ErrorModule::OS, ErrorSummary::WrongArgument, ErrorLevel::Permanent);
}
// TODO(Subv): Check for the Shared Device Mem flag in the creator process.
/*if (was_created_with_shared_device_mem && address != 0) {
return ResultCode(ErrorDescription::InvalidCombination, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage);
}*/
// TODO(Subv): The same process that created a SharedMemory object
// can not map it in its own address space unless it was created with addr=0, result 0xD900182C.
if (address != 0) {
if (address < Memory::HEAP_VADDR || address + size >= Memory::SHARED_MEMORY_VADDR_END) {
LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X name=%s, invalid address",
GetObjectId(), address, name.c_str());
return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::OS,
ErrorSummary::InvalidArgument, ErrorLevel::Usage);
}
}
VAddr target_address = address;
if (base_address == 0 && target_address == 0) {
// Calculate the address at which to map the memory block.
target_address = Memory::PhysicalToVirtualAddress(linear_heap_phys_address);
}
// Map the memory block into the target process
auto result = target_process->vm_manager.MapMemoryBlock(target_address, backing_block, backing_block_offset, size, MemoryState::Shared);
if (result.Failed()) {
LOG_ERROR(Kernel, "cannot map id=%u, target_address=0x%08X name=%s, error mapping to virtual memory",
GetObjectId(), target_address, name.c_str());
return result.Code();
}
return target_process->vm_manager.ReprotectRange(target_address, size, ConvertPermissions(permissions));
}
ResultCode SharedMemory::Unmap(Process* target_process, VAddr address) {
// TODO(Subv): Verify what happens if the application tries to unmap an address that is not mapped to a SharedMemory.
return target_process->vm_manager.UnmapRange(address, size);
}
VMAPermission SharedMemory::ConvertPermissions(MemoryPermission permission) {
u32 masked_permissions = static_cast<u32>(permission) & static_cast<u32>(MemoryPermission::ReadWriteExecute);
return static_cast<VMAPermission>(masked_permissions);
};
u8* SharedMemory::GetPointer(u32 offset) {
return backing_block->data() + backing_block_offset + offset;
}
} // namespace
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