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kernel: shared_memory: Refactor for new VMM.

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This commit is contained in:
bunnei 2020-04-08 18:53:52 -04:00
parent a040a15246
commit d0162fc3d7
2 changed files with 59 additions and 221 deletions
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153
src/core/hle/kernel/shared_memory.cpp
View File

@ -2,149 +2,56 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <utility>
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/hle/kernel/errors.h"
#include "core/core.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/memory/page_table.h"
#include "core/hle/kernel/shared_memory.h"
namespace Kernel {
SharedMemory::SharedMemory(KernelCore& kernel) : Object{kernel} {}
SharedMemory::SharedMemory(KernelCore& kernel, Core::DeviceMemory& device_memory)
: Object{kernel}, device_memory{device_memory} {}
SharedMemory::~SharedMemory() = default;
std::shared_ptr<SharedMemory> SharedMemory::Create(KernelCore& kernel, Process* owner_process,
u64 size, MemoryPermission permissions,
MemoryPermission other_permissions,
VAddr address, MemoryRegion region,
std::string name) {
std::shared_ptr<SharedMemory> shared_memory = std::make_shared<SharedMemory>(kernel);
std::shared_ptr<SharedMemory> SharedMemory::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) {
std::shared_ptr<SharedMemory> shared_memory{
std::make_shared<SharedMemory>(kernel, device_memory)};
shared_memory->owner_process = owner_process;
shared_memory->name = std::move(name);
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->permissions = permissions;
shared_memory->other_permissions = other_permissions;
if (address == 0) {
shared_memory->backing_block = std::make_shared<Kernel::PhysicalMemory>(size);
shared_memory->backing_block_offset = 0;
// Refresh the address mappings for the current process.
if (kernel.CurrentProcess() != nullptr) {
kernel.CurrentProcess()->VMManager().RefreshMemoryBlockMappings(
shared_memory->backing_block.get());
}
} else {
const auto& vm_manager = shared_memory->owner_process->VMManager();
// The memory is already available and mapped in the owner process.
const auto vma = vm_manager.FindVMA(address);
ASSERT_MSG(vm_manager.IsValidHandle(vma), "Invalid memory address");
ASSERT_MSG(vma->second.backing_block, "Backing block doesn't exist for address");
// The returned VMA might be a bigger one encompassing the desired address.
const auto vma_offset = address - vma->first;
ASSERT_MSG(vma_offset + size <= vma->second.size,
"Shared memory exceeds bounds of mapped block");
shared_memory->backing_block = vma->second.backing_block;
shared_memory->backing_block_offset = vma->second.offset + vma_offset;
}
shared_memory->base_address = address;
shared_memory->name = name;
return shared_memory;
}
std::shared_ptr<SharedMemory> SharedMemory::CreateForApplet(
KernelCore& kernel, std::shared_ptr<Kernel::PhysicalMemory> heap_block, std::size_t offset,
u64 size, MemoryPermission permissions, MemoryPermission other_permissions, std::string name) {
std::shared_ptr<SharedMemory> shared_memory = std::make_shared<SharedMemory>(kernel);
ResultCode SharedMemory::Map(Process& target_process, VAddr address, std::size_t size,
Memory::MemoryPermission permission) {
const u64 page_count{(size + Memory::PageSize - 1) / Memory::PageSize};
shared_memory->owner_process = nullptr;
shared_memory->name = std::move(name);
shared_memory->size = size;
shared_memory->permissions = permissions;
shared_memory->other_permissions = other_permissions;
shared_memory->backing_block = std::move(heap_block);
shared_memory->backing_block_offset = offset;
shared_memory->base_address =
kernel.CurrentProcess()->VMManager().GetHeapRegionBaseAddress() + offset;
return shared_memory;
}
ResultCode SharedMemory::Map(Process& target_process, VAddr address, MemoryPermission permissions,
MemoryPermission other_permissions) {
const 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 ERR_INVALID_MEMORY_PERMISSIONS;
if (page_list.GetNumPages() != page_count) {
UNIMPLEMENTED();
}
// 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={}, address=0x{:X} name={}, permissions don't match",
GetObjectId(), address, name);
return ERR_INVALID_MEMORY_PERMISSIONS;
Memory::MemoryPermission expected =
&target_process == owner_process ? owner_permission : user_permission;
if (permission != expected) {
UNIMPLEMENTED();
}
// 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={}, address=0x{:X} name={}, permissions don't match",
GetObjectId(), address, name);
return ERR_INVALID_MEMORY_PERMISSIONS;
}
VAddr target_address = address;
// Map the memory block into the target process
auto result = target_process.VMManager().MapMemoryBlock(
target_address, backing_block, backing_block_offset, size, MemoryState::Shared);
if (result.Failed()) {
LOG_ERROR(
Kernel,
"cannot map id={}, target_address=0x{:X} name={}, error mapping to virtual memory",
GetObjectId(), target_address, name);
return result.Code();
}
return target_process.VMManager().ReprotectRange(target_address, size,
ConvertPermissions(permissions));
}
ResultCode SharedMemory::Unmap(Process& target_process, VAddr address, u64 unmap_size) {
if (unmap_size != size) {
LOG_ERROR(Kernel,
"Invalid size passed to Unmap. Size must be equal to the size of the "
"memory managed. Shared memory size=0x{:016X}, Unmap size=0x{:016X}",
size, unmap_size);
return ERR_INVALID_SIZE;
}
// TODO(Subv): Verify what happens if the application tries to unmap an address that is not
// mapped to a SharedMemory.
return target_process.VMManager().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(std::size_t offset) {
return backing_block->data() + backing_block_offset + offset;
}
const u8* SharedMemory::GetPointer(std::size_t offset) const {
return backing_block->data() + backing_block_offset + offset;
return target_process.PageTable().MapPages(address, page_list, Memory::MemoryState::Shared,
permission);
}
} // namespace Kernel

127
src/core/hle/kernel/shared_memory.h
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@ -8,8 +8,10 @@
#include <string>
#include "common/common_types.h"
#include "core/device_memory.h"
#include "core/hle/kernel/memory/memory_block.h"
#include "core/hle/kernel/memory/page_linked_list.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/physical_memory.h"
#include "core/hle/kernel/process.h"
#include "core/hle/result.h"
@ -17,63 +19,21 @@ namespace Kernel {
class KernelCore;
/// Permissions for mapped shared memory blocks
enum class MemoryPermission : u32 {
None = 0,
Read = (1u << 0),
Write = (1u << 1),
ReadWrite = (Read | Write),
Execute = (1u << 2),
ReadExecute = (Read | Execute),
WriteExecute = (Write | Execute),
ReadWriteExecute = (Read | Write | Execute),
DontCare = (1u << 28)
};
class SharedMemory final : public Object {
public:
explicit SharedMemory(KernelCore& kernel);
explicit SharedMemory(KernelCore& kernel, Core::DeviceMemory& device_memory);
~SharedMemory() override;
/**
* Creates a shared memory object.
* @param kernel The kernel instance to create a shared memory instance under.
* @param owner_process Process that created this shared memory object.
* @param size Size of the memory block. Must be page-aligned.
* @param permissions Permission restrictions applied to the process which created the block.
* @param other_permissions Permission restrictions applied to other processes mapping the
* block.
* @param address The address from which to map the Shared Memory.
* @param region If the address is 0, the shared memory will be allocated in this region of the
* linear heap.
* @param name Optional object name, used for debugging purposes.
*/
static std::shared_ptr<SharedMemory> Create(KernelCore& kernel, Process* owner_process,
u64 size, MemoryPermission permissions,
MemoryPermission other_permissions,
VAddr address = 0,
MemoryRegion region = MemoryRegion::BASE,
std::string name = "Unknown");
/**
* Creates a shared memory object from a block of memory managed by an HLE applet.
* @param kernel The kernel instance to create a shared memory instance under.
* @param heap_block Heap block of the HLE applet.
* @param offset The offset into the heap block that the SharedMemory will map.
* @param size Size of the memory block. Must be page-aligned.
* @param permissions Permission restrictions applied to the process which created the block.
* @param other_permissions Permission restrictions applied to other processes mapping the
* block.
* @param name Optional object name, used for debugging purposes.
*/
static std::shared_ptr<SharedMemory> CreateForApplet(
KernelCore& kernel, std::shared_ptr<Kernel::PhysicalMemory> heap_block, std::size_t offset,
u64 size, MemoryPermission permissions, MemoryPermission other_permissions,
std::string name = "Unknown Applet");
static std::shared_ptr<SharedMemory> 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 = "Unknown");
std::string GetTypeName() const override {
return "SharedMemory";
}
std::string GetName() const override {
return name;
}
@ -83,71 +43,42 @@ public:
return HANDLE_TYPE;
}
/// Gets the size of the underlying memory block in bytes.
u64 GetSize() const {
return size;
}
/**
* Converts the specified MemoryPermission into the equivalent VMAPermission.
* @param permission The MemoryPermission to convert.
*/
static VMAPermission ConvertPermissions(MemoryPermission permission);
/**
* Maps a shared memory block to an address in the target process' address space
* @param target_process Process on which to map the memory block.
* @param target_process Process on which to map the memory block
* @param address Address in system memory to map shared memory block to
* @param size Size of the shared memory block to map
* @param permissions Memory block map permissions (specified by SVC field)
* @param other_permissions Memory block map other permissions (specified by SVC field)
*/
ResultCode Map(Process& target_process, VAddr address, MemoryPermission permissions,
MemoryPermission other_permissions);
/**
* Unmaps a shared memory block from the specified address in system memory
*
* @param target_process Process from which to unmap the memory block.
* @param address Address in system memory where the shared memory block is mapped.
* @param unmap_size The amount of bytes to unmap from this shared memory instance.
*
* @return Result code of the unmap operation
*
* @pre The given size to unmap must be the same size as the amount of memory managed by
* the SharedMemory instance itself, otherwise ERR_INVALID_SIZE will be returned.
*/
ResultCode Unmap(Process& target_process, VAddr address, u64 unmap_size);
ResultCode Map(Process& target_process, VAddr address, std::size_t size,
Memory::MemoryPermission permission);
/**
* Gets a pointer to the shared memory block
* @param offset Offset from the start of the shared memory block to get pointer
* @return A pointer to the shared memory block from the specified offset
*/
u8* GetPointer(std::size_t offset = 0);
u8* GetPointer(std::size_t offset = 0) {
return device_memory.GetPointer(physical_address + offset);
}
/**
* Gets a constant pointer to the shared memory block
* Gets a pointer to the shared memory block
* @param offset Offset from the start of the shared memory block to get pointer
* @return A constant pointer to the shared memory block from the specified offset
* @return A pointer to the shared memory block from the specified offset
*/
const u8* GetPointer(std::size_t offset = 0) const;
const u8* GetPointer(std::size_t offset = 0) const {
return device_memory.GetPointer(physical_address + offset);
}
private:
/// Backing memory for this shared memory block.
std::shared_ptr<PhysicalMemory> backing_block;
/// Offset into the backing block for this shared memory.
std::size_t backing_block_offset = 0;
/// Size of the memory block. Page-aligned.
u64 size = 0;
/// Permission restrictions applied to the process which created the block.
MemoryPermission permissions{};
/// Permission restrictions applied to other processes mapping the block.
MemoryPermission other_permissions{};
/// Process that created this shared memory block.
Process* owner_process;
/// Address of shared memory block in the owner process if specified.
VAddr base_address = 0;
/// Name of shared memory object.
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;
};