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hle: kernel: Use host memory allocations for KSlabMemory.

- There are some issues with the current workaround, we will just use host memory until we have a complete kernel memory implementation.
This commit is contained in:
bunnei 2021-05-20 18:15:59 -07:00
parent 7331bb9d8d
commit b4fc2e52a2
4 changed files with 20 additions and 174 deletions

View file

@ -70,14 +70,22 @@ constexpr size_t SlabCountExtraKThread = 160;
template <typename T>
VAddr InitializeSlabHeap(Core::System& system, KMemoryLayout& memory_layout, VAddr address,
size_t num_objects) {
// TODO(bunnei): This is just a place holder. We should initialize the appropriate KSlabHeap for
// kernel object type T with the backing kernel memory pointer once we emulate kernel memory.
const size_t size = Common::AlignUp(sizeof(T) * num_objects, alignof(void*));
VAddr start = Common::AlignUp(address, alignof(T));
// This is intentionally empty. Once KSlabHeap is fully implemented, we can replace this with
// the pointer to emulated memory to pass along. Until then, KSlabHeap will just allocate/free
// host memory.
void* backing_kernel_memory{};
if (size > 0) {
const KMemoryRegion* region = memory_layout.FindVirtual(start + size - 1);
ASSERT(region != nullptr);
ASSERT(region->IsDerivedFrom(KMemoryRegionType_KernelSlab));
T::InitializeSlabHeap(system.Kernel(), system.Memory().GetKernelBuffer(start, size), size);
T::InitializeSlabHeap(system.Kernel(), backing_kernel_memory, size);
}
return start + size;

View file

@ -4,165 +4,33 @@
#pragma once
#include <atomic>
#include "common/assert.h"
#include "common/common_types.h"
namespace Kernel {
namespace impl {
class KernelCore;
class KSlabHeapImpl final : NonCopyable {
public:
struct Node {
Node* next{};
};
constexpr KSlabHeapImpl() = default;
void Initialize(std::size_t size) {
ASSERT(head == nullptr);
obj_size = size;
}
constexpr std::size_t GetObjectSize() const {
return obj_size;
}
Node* GetHead() const {
return head;
}
void* Allocate() {
Node* ret = head.load();
do {
if (ret == nullptr) {
break;
}
} while (!head.compare_exchange_weak(ret, ret->next));
return ret;
}
void Free(void* obj) {
Node* node = static_cast<Node*>(obj);
Node* cur_head = head.load();
do {
node->next = cur_head;
} while (!head.compare_exchange_weak(cur_head, node));
}
private:
std::atomic<Node*> head{};
std::size_t obj_size{};
};
} // namespace impl
class KSlabHeapBase : NonCopyable {
public:
constexpr KSlabHeapBase() = default;
constexpr bool Contains(uintptr_t addr) const {
return start <= addr && addr < end;
}
constexpr std::size_t GetSlabHeapSize() const {
return (end - start) / GetObjectSize();
}
constexpr std::size_t GetObjectSize() const {
return impl.GetObjectSize();
}
constexpr uintptr_t GetSlabHeapAddress() const {
return start;
}
std::size_t GetObjectIndexImpl(const void* obj) const {
return (reinterpret_cast<uintptr_t>(obj) - start) / GetObjectSize();
}
std::size_t GetPeakIndex() const {
return GetObjectIndexImpl(reinterpret_cast<const void*>(peak));
}
void* AllocateImpl() {
return impl.Allocate();
}
void FreeImpl(void* obj) {
// Don't allow freeing an object that wasn't allocated from this heap
ASSERT(Contains(reinterpret_cast<uintptr_t>(obj)));
impl.Free(obj);
}
void InitializeImpl(std::size_t obj_size, void* memory, std::size_t memory_size) {
// Ensure we don't initialize a slab using null memory
ASSERT(memory != nullptr);
// Initialize the base allocator
impl.Initialize(obj_size);
// Set our tracking variables
const std::size_t num_obj = (memory_size / obj_size);
start = reinterpret_cast<uintptr_t>(memory);
end = start + num_obj * obj_size;
peak = start;
// Free the objects
u8* cur = reinterpret_cast<u8*>(end);
for (std::size_t i{}; i < num_obj; i++) {
cur -= obj_size;
impl.Free(cur);
}
}
private:
using Impl = impl::KSlabHeapImpl;
Impl impl;
uintptr_t peak{};
uintptr_t start{};
uintptr_t end{};
};
/// This is a placeholder class to manage slab heaps for kernel objects. For now, we just allocate
/// these with new/delete, but this can be re-implemented later to allocate these in emulated
/// memory.
template <typename T>
class KSlabHeap final : public KSlabHeapBase {
class KSlabHeap final : NonCopyable {
public:
constexpr KSlabHeap() : KSlabHeapBase() {}
KSlabHeap() = default;
void Initialize(void* memory, std::size_t memory_size) {
InitializeImpl(sizeof(T), memory, memory_size);
void Initialize([[maybe_unused]] void* memory, [[maybe_unused]] std::size_t memory_size) {
// Placeholder that should initialize the backing slab heap implementation.
}
T* Allocate() {
T* obj = static_cast<T*>(AllocateImpl());
if (obj != nullptr) {
new (obj) T();
}
return obj;
return new T();
}
T* AllocateWithKernel(KernelCore& kernel) {
T* obj = static_cast<T*>(AllocateImpl());
if (obj != nullptr) {
new (obj) T(kernel);
}
return obj;
return new T(kernel);
}
void Free(T* obj) {
FreeImpl(obj);
}
constexpr std::size_t GetObjectIndex(const T* obj) const {
return GetObjectIndexImpl(obj);
delete obj;
}
};

View file

@ -82,22 +82,6 @@ struct Memory::Impl {
return nullptr;
}
u8* GetKernelBuffer(VAddr start_vaddr, size_t size) {
// TODO(bunnei): This is just a workaround until we have kernel memory layout mapped &
// managed. Until then, we use this to allocate and access kernel memory regions.
auto search = kernel_memory_regions.find(start_vaddr);
if (search != kernel_memory_regions.end()) {
return search->second.get();
}
std::unique_ptr<u8[]> new_memory_region{new u8[size]};
u8* raw_ptr = new_memory_region.get();
kernel_memory_regions[start_vaddr] = std::move(new_memory_region);
return raw_ptr;
}
u8 Read8(const VAddr addr) {
return Read<u8>(addr);
}
@ -727,7 +711,6 @@ struct Memory::Impl {
}
Common::PageTable* current_page_table = nullptr;
std::unordered_map<VAddr, std::unique_ptr<u8[]>> kernel_memory_regions;
Core::System& system;
};
@ -765,10 +748,6 @@ u8* Memory::GetPointer(VAddr vaddr) {
return impl->GetPointer(vaddr);
}
u8* Memory::GetKernelBuffer(VAddr start_vaddr, size_t size) {
return impl->GetKernelBuffer(start_vaddr, size);
}
const u8* Memory::GetPointer(VAddr vaddr) const {
return impl->GetPointer(vaddr);
}

View file

@ -121,15 +121,6 @@ public:
*/
u8* GetPointer(VAddr vaddr);
/**
* Gets a pointer to the start of a kernel heap allocated memory region. Will allocate one if it
* does not already exist.
*
* @param start_vaddr Start virtual address for the memory region.
* @param size Size of the memory region.
*/
u8* GetKernelBuffer(VAddr start_vaddr, size_t size);
template <typename T>
T* GetPointer(VAddr vaddr) {
return reinterpret_cast<T*>(GetPointer(vaddr));