2 files changed, 274 insertions, 0 deletions

diff --git a/src/core/hle/kernel/memory/memory_manager.cpp b/src/core/hle/kernel/memory/memory_manager.cpp
new file mode 100644
index 000000000..9c1bb981b
--- /dev/null
+++ b/src/core/hle/kernel/memory/memory_manager.cpp
@@ -0,0 +1,177 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+
+#include "common/alignment.h"
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "common/scope_exit.h"
+#include "core/hle/kernel/errors.h"
+#include "core/hle/kernel/memory/memory_manager.h"
+#include "core/hle/kernel/memory/page_linked_list.h"
+
+namespace Kernel::Memory {
+
+std::size_t MemoryManager::Impl::Initialize(Pool new_pool, u64 start_address, u64 end_address) {
+    const std::size_t size{end_address - start_address};
+
+    // Calculate metadata sizes
+    const std::size_t ref_count_size{(size / PageSize) * sizeof(u16)};
+    const std::size_t optimize_map_size{(Common::AlignUp((size / PageSize), 64) / 64) *
+                                        sizeof(u64)};
+    const std::size_t manager_size{Common::AlignUp(optimize_map_size + ref_count_size, PageSize)};
+    const std::size_t page_heap_size{PageHeap::CalculateMetadataOverheadSize(size)};
+    const std::size_t total_metadata_size{manager_size + page_heap_size};
+    ASSERT(manager_size <= total_metadata_size);
+    ASSERT(Common::IsAligned(total_metadata_size, PageSize));
+
+    // Setup region
+    pool = new_pool;
+
+    // Initialize the manager's KPageHeap
+    heap.Initialize(start_address, size, page_heap_size);
+
+    // Free the memory to the heap
+    heap.Free(start_address, size / PageSize);
+
+    // Update the heap's used size
+    heap.UpdateUsedSize();
+
+    return total_metadata_size;
+}
+
+void MemoryManager::InitializeManager(Pool pool, u64 start_address, u64 end_address) {
+    ASSERT(pool < Pool::Count);
+    managers[static_cast<std::size_t>(pool)].Initialize(pool, start_address, end_address);
+}
+
+VAddr MemoryManager::AllocateContinuous(std::size_t num_pages, std::size_t align_pages, Pool pool,
+                                        Direction dir) {
+    // Early return if we're allocating no pages
+    if (num_pages == 0) {
+        return {};
+    }
+
+    // Lock the pool that we're allocating from
+    const std::size_t pool_index{static_cast<std::size_t>(pool)};
+    std::lock_guard lock{pool_locks[pool_index]};
+
+    // Choose a heap based on our page size request
+    const s32 heap_index{PageHeap::GetAlignedBlockIndex(num_pages, align_pages)};
+
+    // Loop, trying to iterate from each block
+    // TODO (bunnei): Support multiple managers
+    Impl& chosen_manager{managers[pool_index]};
+    VAddr allocated_block{chosen_manager.AllocateBlock(heap_index)};
+
+    // If we failed to allocate, quit now
+    if (!allocated_block) {
+        return {};
+    }
+
+    // If we allocated more than we need, free some
+    const std::size_t allocated_pages{PageHeap::GetBlockNumPages(heap_index)};
+    if (allocated_pages > num_pages) {
+        chosen_manager.Free(allocated_block + num_pages * PageSize, allocated_pages - num_pages);
+    }
+
+    return allocated_block;
+}
+
+ResultCode MemoryManager::Allocate(PageLinkedList& page_list, std::size_t num_pages, Pool pool,
+                                   Direction dir) {
+    ASSERT(page_list.GetNumPages() == 0);
+
+    // Early return if we're allocating no pages
+    if (num_pages == 0) {
+        return RESULT_SUCCESS;
+    }
+
+    // Lock the pool that we're allocating from
+    const std::size_t pool_index{static_cast<std::size_t>(pool)};
+    std::lock_guard lock{pool_locks[pool_index]};
+
+    // Choose a heap based on our page size request
+    const s32 heap_index{PageHeap::GetBlockIndex(num_pages)};
+    if (heap_index < 0) {
+        return ERR_OUT_OF_MEMORY;
+    }
+
+    // TODO (bunnei): Support multiple managers
+    Impl& chosen_manager{managers[pool_index]};
+
+    // Ensure that we don't leave anything un-freed
+    auto group_guard = detail::ScopeExit([&] {
+        for (const auto& it : page_list.Nodes()) {
+            const std::size_t num_pages{std::min(
+                it.GetNumPages(), (chosen_manager.GetEndAddress() - it.GetAddress()) / PageSize)};
+            chosen_manager.Free(it.GetAddress(), num_pages);
+        }
+    });
+
+    // Keep allocating until we've allocated all our pages
+    for (s32 index{heap_index}; index >= 0 && num_pages > 0; index--) {
+        const std::size_t pages_per_alloc{PageHeap::GetBlockNumPages(index)};
+
+        while (num_pages >= pages_per_alloc) {
+            // Allocate a block
+            VAddr allocated_block{chosen_manager.AllocateBlock(index)};
+            if (allocated_block == 0) {
+                break;
+            }
+
+            // Safely add it to our group
+            {
+                auto block_guard = detail::ScopeExit(
+                    [&] { chosen_manager.Free(allocated_block, pages_per_alloc); });
+
+                if (const ResultCode result{page_list.AddBlock(allocated_block, pages_per_alloc)};
+                    result.IsError()) {
+                    return result;
+                }
+
+                block_guard.Cancel();
+            }
+
+            num_pages -= pages_per_alloc;
+        }
+    }
+
+    // Only succeed if we allocated as many pages as we wanted
+    ASSERT(num_pages >= 0);
+    if (num_pages) {
+        return ERR_OUT_OF_MEMORY;
+    }
+
+    // We succeeded!
+    group_guard.Cancel();
+    return RESULT_SUCCESS;
+}
+
+ResultCode MemoryManager::Free(PageLinkedList& page_list, std::size_t num_pages, Pool pool,
+                               Direction dir) {
+    // Early return if we're freeing no pages
+    if (!num_pages) {
+        return RESULT_SUCCESS;
+    }
+
+    // Lock the pool that we're freeing from
+    const std::size_t pool_index{static_cast<std::size_t>(pool)};
+    std::lock_guard lock{pool_locks[pool_index]};
+
+    // TODO (bunnei): Support multiple managers
+    Impl& chosen_manager{managers[pool_index]};
+
+    // Free all of the pages
+    for (const auto& it : page_list.Nodes()) {
+        const std::size_t num_pages{std::min(
+            it.GetNumPages(), (chosen_manager.GetEndAddress() - it.GetAddress()) / PageSize)};
+        chosen_manager.Free(it.GetAddress(), num_pages);
+    }
+
+    return RESULT_SUCCESS;
+}
+
+} // namespace Kernel::Memory
diff --git a/src/core/hle/kernel/memory/memory_manager.h b/src/core/hle/kernel/memory/memory_manager.h
new file mode 100644
index 000000000..b078d7a5e
--- /dev/null
+++ b/src/core/hle/kernel/memory/memory_manager.h
@@ -0,0 +1,97 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <mutex>
+
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "core/hle/kernel/memory/page_heap.h"
+#include "core/hle/result.h"
+
+namespace Kernel::Memory {
+
+class PageLinkedList;
+
+class MemoryManager final : NonCopyable {
+public:
+    enum class Pool : u32 {
+        Application = 0,
+        Applet = 1,
+        System = 2,
+        SystemNonSecure = 3,
+
+        Count,
+
+        Shift = 4,
+        Mask = (0xF << Shift),
+    };
+
+    enum class Direction : u32 {
+        FromFront = 0,
+        FromBack = 1,
+
+        Shift = 0,
+        Mask = (0xF << Shift),
+    };
+
+    MemoryManager() = default;
+
+    constexpr std::size_t GetSize(Pool pool) const {
+        return managers[static_cast<std::size_t>(pool)].GetSize();
+    }
+
+    void InitializeManager(Pool pool, u64 start_address, u64 end_address);
+    VAddr AllocateContinuous(std::size_t num_pages, std::size_t align_pages, Pool pool,
+                             Direction dir = Direction::FromFront);
+    ResultCode Allocate(PageLinkedList& page_list, std::size_t num_pages, Pool pool,
+                        Direction dir = Direction::FromFront);
+    ResultCode Free(PageLinkedList& page_list, std::size_t num_pages, Pool pool,
+                    Direction dir = Direction::FromFront);
+
+    static constexpr std::size_t MaxManagerCount = 10;
+
+private:
+    class Impl final : NonCopyable {
+    private:
+        using RefCount = u16;
+
+    private:
+        PageHeap heap;
+        Pool pool{};
+
+    public:
+        Impl() = default;
+
+        std::size_t Initialize(Pool new_pool, u64 start_address, u64 end_address);
+
+        VAddr AllocateBlock(s32 index) {
+            return heap.AllocateBlock(index);
+        }
+
+        void Free(VAddr addr, std::size_t num_pages) {
+            heap.Free(addr, num_pages);
+        }
+
+        constexpr std::size_t GetSize() const {
+            return heap.GetSize();
+        }
+
+        constexpr VAddr GetAddress() const {
+            return heap.GetAddress();
+        }
+
+        constexpr VAddr GetEndAddress() const {
+            return heap.GetEndAddress();
+        }
+    };
+
+private:
+    std::array<std::mutex, static_cast<std::size_t>(Pool::Count)> pool_locks;
+    std::array<Impl, MaxManagerCount> managers;
+};
+
+} // namespace Kernel::Memory