kernel: shared_memory: Refactor for new VMM.
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bunnei
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2 changed files with 59 additions and 221 deletions
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@ -2,149 +2,56 @@
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <utility>
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#include "common/assert.h"
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#include "common/logging/log.h"
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#include "core/hle/kernel/errors.h"
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#include "core/core.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/memory/page_table.h"
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#include "core/hle/kernel/shared_memory.h"
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namespace Kernel {
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SharedMemory::SharedMemory(KernelCore& kernel) : Object{kernel} {}
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SharedMemory::SharedMemory(KernelCore& kernel, Core::DeviceMemory& device_memory)
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: Object{kernel}, device_memory{device_memory} {}
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SharedMemory::~SharedMemory() = default;
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std::shared_ptr<SharedMemory> SharedMemory::Create(KernelCore& kernel, Process* owner_process,
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u64 size, MemoryPermission permissions,
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MemoryPermission other_permissions,
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VAddr address, MemoryRegion region,
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std::shared_ptr<SharedMemory> SharedMemory::Create(
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KernelCore& kernel, Core::DeviceMemory& device_memory, Process* owner_process,
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Memory::PageLinkedList&& page_list, Memory::MemoryPermission owner_permission,
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Memory::MemoryPermission user_permission, PAddr physical_address, std::size_t size,
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std::string name) {
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std::shared_ptr<SharedMemory> shared_memory = std::make_shared<SharedMemory>(kernel);
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std::shared_ptr<SharedMemory> shared_memory{
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std::make_shared<SharedMemory>(kernel, device_memory)};
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shared_memory->owner_process = owner_process;
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shared_memory->name = std::move(name);
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shared_memory->page_list = std::move(page_list);
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shared_memory->owner_permission = owner_permission;
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shared_memory->user_permission = user_permission;
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shared_memory->physical_address = physical_address;
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shared_memory->size = size;
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shared_memory->permissions = permissions;
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shared_memory->other_permissions = other_permissions;
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if (address == 0) {
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shared_memory->backing_block = std::make_shared<Kernel::PhysicalMemory>(size);
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shared_memory->backing_block_offset = 0;
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// Refresh the address mappings for the current process.
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if (kernel.CurrentProcess() != nullptr) {
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kernel.CurrentProcess()->VMManager().RefreshMemoryBlockMappings(
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shared_memory->backing_block.get());
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}
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} else {
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const auto& vm_manager = shared_memory->owner_process->VMManager();
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// The memory is already available and mapped in the owner process.
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const auto vma = vm_manager.FindVMA(address);
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ASSERT_MSG(vm_manager.IsValidHandle(vma), "Invalid memory address");
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ASSERT_MSG(vma->second.backing_block, "Backing block doesn't exist for address");
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// The returned VMA might be a bigger one encompassing the desired address.
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const auto vma_offset = address - vma->first;
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ASSERT_MSG(vma_offset + size <= vma->second.size,
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"Shared memory exceeds bounds of mapped block");
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shared_memory->backing_block = vma->second.backing_block;
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shared_memory->backing_block_offset = vma->second.offset + vma_offset;
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}
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shared_memory->base_address = address;
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shared_memory->name = name;
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return shared_memory;
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}
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std::shared_ptr<SharedMemory> SharedMemory::CreateForApplet(
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KernelCore& kernel, std::shared_ptr<Kernel::PhysicalMemory> heap_block, std::size_t offset,
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u64 size, MemoryPermission permissions, MemoryPermission other_permissions, std::string name) {
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std::shared_ptr<SharedMemory> shared_memory = std::make_shared<SharedMemory>(kernel);
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ResultCode SharedMemory::Map(Process& target_process, VAddr address, std::size_t size,
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Memory::MemoryPermission permission) {
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const u64 page_count{(size + Memory::PageSize - 1) / Memory::PageSize};
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shared_memory->owner_process = nullptr;
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shared_memory->name = std::move(name);
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shared_memory->size = size;
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shared_memory->permissions = permissions;
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shared_memory->other_permissions = other_permissions;
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shared_memory->backing_block = std::move(heap_block);
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shared_memory->backing_block_offset = offset;
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shared_memory->base_address =
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kernel.CurrentProcess()->VMManager().GetHeapRegionBaseAddress() + offset;
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return shared_memory;
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}
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ResultCode SharedMemory::Map(Process& target_process, VAddr address, MemoryPermission permissions,
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MemoryPermission other_permissions) {
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const MemoryPermission own_other_permissions =
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&target_process == owner_process ? this->permissions : this->other_permissions;
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// Automatically allocated memory blocks can only be mapped with other_permissions = DontCare
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if (base_address == 0 && other_permissions != MemoryPermission::DontCare) {
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return ERR_INVALID_MEMORY_PERMISSIONS;
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if (page_list.GetNumPages() != page_count) {
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UNIMPLEMENTED();
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}
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// Error out if the requested permissions don't match what the creator process allows.
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if (static_cast<u32>(permissions) & ~static_cast<u32>(own_other_permissions)) {
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LOG_ERROR(Kernel, "cannot map id={}, address=0x{:X} name={}, permissions don't match",
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GetObjectId(), address, name);
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return ERR_INVALID_MEMORY_PERMISSIONS;
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Memory::MemoryPermission expected =
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&target_process == owner_process ? owner_permission : user_permission;
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if (permission != expected) {
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UNIMPLEMENTED();
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}
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// Error out if the provided permissions are not compatible with what the creator process needs.
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if (other_permissions != MemoryPermission::DontCare &&
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static_cast<u32>(this->permissions) & ~static_cast<u32>(other_permissions)) {
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LOG_ERROR(Kernel, "cannot map id={}, address=0x{:X} name={}, permissions don't match",
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GetObjectId(), address, name);
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return ERR_INVALID_MEMORY_PERMISSIONS;
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}
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VAddr target_address = address;
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// Map the memory block into the target process
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auto result = target_process.VMManager().MapMemoryBlock(
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target_address, backing_block, backing_block_offset, size, MemoryState::Shared);
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if (result.Failed()) {
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LOG_ERROR(
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Kernel,
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"cannot map id={}, target_address=0x{:X} name={}, error mapping to virtual memory",
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GetObjectId(), target_address, name);
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return result.Code();
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}
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return target_process.VMManager().ReprotectRange(target_address, size,
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ConvertPermissions(permissions));
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}
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ResultCode SharedMemory::Unmap(Process& target_process, VAddr address, u64 unmap_size) {
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if (unmap_size != size) {
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LOG_ERROR(Kernel,
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"Invalid size passed to Unmap. Size must be equal to the size of the "
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"memory managed. Shared memory size=0x{:016X}, Unmap size=0x{:016X}",
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size, unmap_size);
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return ERR_INVALID_SIZE;
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}
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// TODO(Subv): Verify what happens if the application tries to unmap an address that is not
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// mapped to a SharedMemory.
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return target_process.VMManager().UnmapRange(address, size);
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}
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VMAPermission SharedMemory::ConvertPermissions(MemoryPermission permission) {
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u32 masked_permissions =
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static_cast<u32>(permission) & static_cast<u32>(MemoryPermission::ReadWriteExecute);
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return static_cast<VMAPermission>(masked_permissions);
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}
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u8* SharedMemory::GetPointer(std::size_t offset) {
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return backing_block->data() + backing_block_offset + offset;
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}
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const u8* SharedMemory::GetPointer(std::size_t offset) const {
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return backing_block->data() + backing_block_offset + offset;
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return target_process.PageTable().MapPages(address, page_list, Memory::MemoryState::Shared,
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permission);
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}
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} // namespace Kernel
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@ -8,8 +8,10 @@
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#include <string>
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#include "common/common_types.h"
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#include "core/device_memory.h"
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#include "core/hle/kernel/memory/memory_block.h"
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#include "core/hle/kernel/memory/page_linked_list.h"
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#include "core/hle/kernel/object.h"
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#include "core/hle/kernel/physical_memory.h"
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#include "core/hle/kernel/process.h"
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#include "core/hle/result.h"
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@ -17,63 +19,21 @@ namespace Kernel {
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class KernelCore;
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/// Permissions for mapped shared memory blocks
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enum class MemoryPermission : u32 {
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None = 0,
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Read = (1u << 0),
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Write = (1u << 1),
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ReadWrite = (Read | Write),
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Execute = (1u << 2),
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ReadExecute = (Read | Execute),
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WriteExecute = (Write | Execute),
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ReadWriteExecute = (Read | Write | Execute),
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DontCare = (1u << 28)
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};
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class SharedMemory final : public Object {
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public:
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explicit SharedMemory(KernelCore& kernel);
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explicit SharedMemory(KernelCore& kernel, Core::DeviceMemory& device_memory);
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~SharedMemory() override;
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/**
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* Creates a shared memory object.
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* @param kernel The kernel instance to create a shared memory instance under.
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* @param owner_process Process that created this shared memory object.
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* @param size Size of the memory block. Must be page-aligned.
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* @param permissions Permission restrictions applied to the process which created the block.
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* @param other_permissions Permission restrictions applied to other processes mapping the
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* block.
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* @param address The address from which to map the Shared Memory.
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* @param region If the address is 0, the shared memory will be allocated in this region of the
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* linear heap.
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* @param name Optional object name, used for debugging purposes.
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*/
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static std::shared_ptr<SharedMemory> Create(KernelCore& kernel, Process* owner_process,
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u64 size, MemoryPermission permissions,
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MemoryPermission other_permissions,
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VAddr address = 0,
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MemoryRegion region = MemoryRegion::BASE,
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static std::shared_ptr<SharedMemory> Create(
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KernelCore& kernel, Core::DeviceMemory& device_memory, Process* owner_process,
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Memory::PageLinkedList&& page_list, Memory::MemoryPermission owner_permission,
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Memory::MemoryPermission user_permission, PAddr physical_address, std::size_t size,
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std::string name = "Unknown");
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/**
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* Creates a shared memory object from a block of memory managed by an HLE applet.
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* @param kernel The kernel instance to create a shared memory instance under.
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* @param heap_block Heap block of the HLE applet.
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* @param offset The offset into the heap block that the SharedMemory will map.
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* @param size Size of the memory block. Must be page-aligned.
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* @param permissions Permission restrictions applied to the process which created the block.
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* @param other_permissions Permission restrictions applied to other processes mapping the
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* block.
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* @param name Optional object name, used for debugging purposes.
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*/
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static std::shared_ptr<SharedMemory> CreateForApplet(
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KernelCore& kernel, std::shared_ptr<Kernel::PhysicalMemory> heap_block, std::size_t offset,
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u64 size, MemoryPermission permissions, MemoryPermission other_permissions,
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std::string name = "Unknown Applet");
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std::string GetTypeName() const override {
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return "SharedMemory";
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}
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std::string GetName() const override {
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return name;
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}
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@ -83,71 +43,42 @@ public:
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return HANDLE_TYPE;
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}
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/// Gets the size of the underlying memory block in bytes.
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u64 GetSize() const {
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return size;
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}
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/**
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* Converts the specified MemoryPermission into the equivalent VMAPermission.
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* @param permission The MemoryPermission to convert.
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*/
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static VMAPermission ConvertPermissions(MemoryPermission permission);
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/**
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* Maps a shared memory block to an address in the target process' address space
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* @param target_process Process on which to map the memory block.
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* @param target_process Process on which to map the memory block
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* @param address Address in system memory to map shared memory block to
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* @param size Size of the shared memory block to map
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* @param permissions Memory block map permissions (specified by SVC field)
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* @param other_permissions Memory block map other permissions (specified by SVC field)
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*/
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ResultCode Map(Process& target_process, VAddr address, MemoryPermission permissions,
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MemoryPermission other_permissions);
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/**
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* Unmaps a shared memory block from the specified address in system memory
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*
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* @param target_process Process from which to unmap the memory block.
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* @param address Address in system memory where the shared memory block is mapped.
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* @param unmap_size The amount of bytes to unmap from this shared memory instance.
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*
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* @return Result code of the unmap operation
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*
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* @pre The given size to unmap must be the same size as the amount of memory managed by
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* the SharedMemory instance itself, otherwise ERR_INVALID_SIZE will be returned.
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*/
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ResultCode Unmap(Process& target_process, VAddr address, u64 unmap_size);
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ResultCode Map(Process& target_process, VAddr address, std::size_t size,
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Memory::MemoryPermission permission);
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/**
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* Gets a pointer to the shared memory block
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* @param offset Offset from the start of the shared memory block to get pointer
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* @return A pointer to the shared memory block from the specified offset
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*/
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u8* GetPointer(std::size_t offset = 0);
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u8* GetPointer(std::size_t offset = 0) {
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return device_memory.GetPointer(physical_address + offset);
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}
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/**
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* Gets a constant pointer to the shared memory block
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* Gets a pointer to the shared memory block
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* @param offset Offset from the start of the shared memory block to get pointer
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* @return A constant pointer to the shared memory block from the specified offset
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* @return A pointer to the shared memory block from the specified offset
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*/
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const u8* GetPointer(std::size_t offset = 0) const;
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const u8* GetPointer(std::size_t offset = 0) const {
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return device_memory.GetPointer(physical_address + offset);
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}
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private:
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/// Backing memory for this shared memory block.
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std::shared_ptr<PhysicalMemory> backing_block;
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/// Offset into the backing block for this shared memory.
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std::size_t backing_block_offset = 0;
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/// Size of the memory block. Page-aligned.
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u64 size = 0;
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/// Permission restrictions applied to the process which created the block.
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MemoryPermission permissions{};
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/// Permission restrictions applied to other processes mapping the block.
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MemoryPermission other_permissions{};
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/// Process that created this shared memory block.
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Process* owner_process;
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/// Address of shared memory block in the owner process if specified.
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VAddr base_address = 0;
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/// Name of shared memory object.
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Core::DeviceMemory& device_memory;
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Process* owner_process{};
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Memory::PageLinkedList page_list;
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Memory::MemoryPermission owner_permission{};
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Memory::MemoryPermission user_permission{};
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PAddr physical_address{};
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std::size_t size{};
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std::string name;
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};
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