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.
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bunnei
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7331bb9d8d
commit
b4fc2e52a2
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@ -70,14 +70,22 @@ constexpr size_t SlabCountExtraKThread = 160;
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template <typename T>
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VAddr InitializeSlabHeap(Core::System& system, KMemoryLayout& memory_layout, VAddr address,
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size_t num_objects) {
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// TODO(bunnei): This is just a place holder. We should initialize the appropriate KSlabHeap for
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// kernel object type T with the backing kernel memory pointer once we emulate kernel memory.
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const size_t size = Common::AlignUp(sizeof(T) * num_objects, alignof(void*));
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VAddr start = Common::AlignUp(address, alignof(T));
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// This is intentionally empty. Once KSlabHeap is fully implemented, we can replace this with
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// the pointer to emulated memory to pass along. Until then, KSlabHeap will just allocate/free
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// host memory.
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void* backing_kernel_memory{};
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if (size > 0) {
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const KMemoryRegion* region = memory_layout.FindVirtual(start + size - 1);
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ASSERT(region != nullptr);
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ASSERT(region->IsDerivedFrom(KMemoryRegionType_KernelSlab));
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T::InitializeSlabHeap(system.Kernel(), system.Memory().GetKernelBuffer(start, size), size);
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T::InitializeSlabHeap(system.Kernel(), backing_kernel_memory, size);
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}
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return start + size;
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@ -4,165 +4,33 @@
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#pragma once
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#include <atomic>
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#include "common/assert.h"
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#include "common/common_types.h"
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namespace Kernel {
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namespace impl {
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class KernelCore;
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class KSlabHeapImpl final : NonCopyable {
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public:
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struct Node {
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Node* next{};
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};
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constexpr KSlabHeapImpl() = default;
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void Initialize(std::size_t size) {
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ASSERT(head == nullptr);
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obj_size = size;
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}
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constexpr std::size_t GetObjectSize() const {
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return obj_size;
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}
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Node* GetHead() const {
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return head;
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}
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void* Allocate() {
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Node* ret = head.load();
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do {
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if (ret == nullptr) {
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break;
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}
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} while (!head.compare_exchange_weak(ret, ret->next));
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return ret;
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}
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void Free(void* obj) {
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Node* node = static_cast<Node*>(obj);
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Node* cur_head = head.load();
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do {
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node->next = cur_head;
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} while (!head.compare_exchange_weak(cur_head, node));
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}
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private:
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std::atomic<Node*> head{};
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std::size_t obj_size{};
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};
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} // namespace impl
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class KSlabHeapBase : NonCopyable {
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public:
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constexpr KSlabHeapBase() = default;
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constexpr bool Contains(uintptr_t addr) const {
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return start <= addr && addr < end;
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}
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constexpr std::size_t GetSlabHeapSize() const {
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return (end - start) / GetObjectSize();
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}
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constexpr std::size_t GetObjectSize() const {
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return impl.GetObjectSize();
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}
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constexpr uintptr_t GetSlabHeapAddress() const {
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return start;
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}
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std::size_t GetObjectIndexImpl(const void* obj) const {
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return (reinterpret_cast<uintptr_t>(obj) - start) / GetObjectSize();
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}
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std::size_t GetPeakIndex() const {
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return GetObjectIndexImpl(reinterpret_cast<const void*>(peak));
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}
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void* AllocateImpl() {
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return impl.Allocate();
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}
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void FreeImpl(void* obj) {
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// Don't allow freeing an object that wasn't allocated from this heap
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ASSERT(Contains(reinterpret_cast<uintptr_t>(obj)));
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impl.Free(obj);
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}
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void InitializeImpl(std::size_t obj_size, void* memory, std::size_t memory_size) {
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// Ensure we don't initialize a slab using null memory
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ASSERT(memory != nullptr);
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// Initialize the base allocator
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impl.Initialize(obj_size);
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// Set our tracking variables
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const std::size_t num_obj = (memory_size / obj_size);
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start = reinterpret_cast<uintptr_t>(memory);
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end = start + num_obj * obj_size;
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peak = start;
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// Free the objects
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u8* cur = reinterpret_cast<u8*>(end);
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for (std::size_t i{}; i < num_obj; i++) {
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cur -= obj_size;
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impl.Free(cur);
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}
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}
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private:
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using Impl = impl::KSlabHeapImpl;
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Impl impl;
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uintptr_t peak{};
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uintptr_t start{};
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uintptr_t end{};
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};
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/// This is a placeholder class to manage slab heaps for kernel objects. For now, we just allocate
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/// these with new/delete, but this can be re-implemented later to allocate these in emulated
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/// memory.
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template <typename T>
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class KSlabHeap final : public KSlabHeapBase {
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class KSlabHeap final : NonCopyable {
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public:
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constexpr KSlabHeap() : KSlabHeapBase() {}
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KSlabHeap() = default;
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void Initialize(void* memory, std::size_t memory_size) {
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InitializeImpl(sizeof(T), memory, memory_size);
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void Initialize([[maybe_unused]] void* memory, [[maybe_unused]] std::size_t memory_size) {
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// Placeholder that should initialize the backing slab heap implementation.
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}
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T* Allocate() {
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T* obj = static_cast<T*>(AllocateImpl());
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if (obj != nullptr) {
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new (obj) T();
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}
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return obj;
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return new T();
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}
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T* AllocateWithKernel(KernelCore& kernel) {
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T* obj = static_cast<T*>(AllocateImpl());
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if (obj != nullptr) {
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new (obj) T(kernel);
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}
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return obj;
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return new T(kernel);
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}
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void Free(T* obj) {
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FreeImpl(obj);
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}
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constexpr std::size_t GetObjectIndex(const T* obj) const {
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return GetObjectIndexImpl(obj);
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delete obj;
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}
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};
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@ -82,22 +82,6 @@ struct Memory::Impl {
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return nullptr;
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}
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u8* GetKernelBuffer(VAddr start_vaddr, size_t size) {
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// TODO(bunnei): This is just a workaround until we have kernel memory layout mapped &
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// managed. Until then, we use this to allocate and access kernel memory regions.
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auto search = kernel_memory_regions.find(start_vaddr);
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if (search != kernel_memory_regions.end()) {
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return search->second.get();
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}
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std::unique_ptr<u8[]> new_memory_region{new u8[size]};
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u8* raw_ptr = new_memory_region.get();
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kernel_memory_regions[start_vaddr] = std::move(new_memory_region);
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return raw_ptr;
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}
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u8 Read8(const VAddr addr) {
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return Read<u8>(addr);
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}
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@ -727,7 +711,6 @@ struct Memory::Impl {
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}
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Common::PageTable* current_page_table = nullptr;
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std::unordered_map<VAddr, std::unique_ptr<u8[]>> kernel_memory_regions;
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Core::System& system;
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};
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@ -765,10 +748,6 @@ u8* Memory::GetPointer(VAddr vaddr) {
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return impl->GetPointer(vaddr);
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}
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u8* Memory::GetKernelBuffer(VAddr start_vaddr, size_t size) {
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return impl->GetKernelBuffer(start_vaddr, size);
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}
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const u8* Memory::GetPointer(VAddr vaddr) const {
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return impl->GetPointer(vaddr);
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}
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@ -121,15 +121,6 @@ public:
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*/
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u8* GetPointer(VAddr vaddr);
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/**
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* Gets a pointer to the start of a kernel heap allocated memory region. Will allocate one if it
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* does not already exist.
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*
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* @param start_vaddr Start virtual address for the memory region.
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* @param size Size of the memory region.
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*/
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u8* GetKernelBuffer(VAddr start_vaddr, size_t size);
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template <typename T>
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T* GetPointer(VAddr vaddr) {
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return reinterpret_cast<T*>(GetPointer(vaddr));
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