3 files changed, 227 insertions, 0 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 4a7589fe8..d149e2ba6 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -157,6 +157,8 @@ add_library(core STATIC
     hle/kernel/handle_table.h
     hle/kernel/hle_ipc.cpp
     hle/kernel/hle_ipc.h
+    hle/kernel/init/init_slab_setup.cpp
+    hle/kernel/init/init_slab_setup.h
     hle/kernel/k_address_arbiter.cpp
     hle/kernel/k_address_arbiter.h
     hle/kernel/k_address_space_info.cpp
diff --git a/src/core/hle/kernel/init/init_slab_setup.cpp b/src/core/hle/kernel/init/init_slab_setup.cpp
new file mode 100644
index 000000000..a290249c7
--- /dev/null
+++ b/src/core/hle/kernel/init/init_slab_setup.cpp
@@ -0,0 +1,183 @@
+// Copyright 2021 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/alignment.h"
+#include "common/assert.h"
+#include "common/common_funcs.h"
+#include "common/common_types.h"
+#include "core/core.h"
+#include "core/hardware_properties.h"
+#include "core/hle/kernel/init/init_slab_setup.h"
+#include "core/hle/kernel/k_memory_layout.h"
+#include "core/hle/kernel/k_memory_manager.h"
+#include "core/hle/kernel/k_system_control.h"
+#include "core/hle/kernel/k_thread.h"
+#include "core/hle/kernel/memory_types.h"
+#include "core/memory.h"
+
+namespace Kernel::Init {
+
+#define SLAB_COUNT(CLASS) g_slab_resource_counts.num_##CLASS
+
+#define FOREACH_SLAB_TYPE(HANDLER, ...) HANDLER(KThread, (SLAB_COUNT(KThread)), ##__VA_ARGS__)
+
+namespace {
+
+#define DEFINE_SLAB_TYPE_ENUM_MEMBER(NAME, COUNT, ...) KSlabType_##NAME,
+
+enum KSlabType : u32 {
+    FOREACH_SLAB_TYPE(DEFINE_SLAB_TYPE_ENUM_MEMBER) KSlabType_Count,
+};
+
+#undef DEFINE_SLAB_TYPE_ENUM_MEMBER
+
+// Constexpr counts.
+constexpr size_t SlabCountKProcess = 80;
+constexpr size_t SlabCountKThread = 800;
+constexpr size_t SlabCountKEvent = 700;
+constexpr size_t SlabCountKInterruptEvent = 100;
+constexpr size_t SlabCountKPort = 256 + 0x20; // Extra 0x20 ports over Nintendo for homebrew.
+constexpr size_t SlabCountKSharedMemory = 80;
+constexpr size_t SlabCountKTransferMemory = 200;
+constexpr size_t SlabCountKCodeMemory = 10;
+constexpr size_t SlabCountKDeviceAddressSpace = 300;
+constexpr size_t SlabCountKSession = 933;
+constexpr size_t SlabCountKLightSession = 100;
+constexpr size_t SlabCountKObjectName = 7;
+constexpr size_t SlabCountKResourceLimit = 5;
+constexpr size_t SlabCountKDebug = Core::Hardware::NUM_CPU_CORES;
+constexpr size_t SlabCountKAlpha = 1;
+constexpr size_t SlabCountKBeta = 6;
+
+constexpr size_t SlabCountExtraKThread = 160;
+
+// Global to hold our resource counts.
+KSlabResourceCounts g_slab_resource_counts = {
+    .num_KProcess = SlabCountKProcess,
+    .num_KThread = SlabCountKThread,
+    .num_KEvent = SlabCountKEvent,
+    .num_KInterruptEvent = SlabCountKInterruptEvent,
+    .num_KPort = SlabCountKPort,
+    .num_KSharedMemory = SlabCountKSharedMemory,
+    .num_KTransferMemory = SlabCountKTransferMemory,
+    .num_KCodeMemory = SlabCountKCodeMemory,
+    .num_KDeviceAddressSpace = SlabCountKDeviceAddressSpace,
+    .num_KSession = SlabCountKSession,
+    .num_KLightSession = SlabCountKLightSession,
+    .num_KObjectName = SlabCountKObjectName,
+    .num_KResourceLimit = SlabCountKResourceLimit,
+    .num_KDebug = SlabCountKDebug,
+    .num_KAlpha = SlabCountKAlpha,
+    .num_KBeta = SlabCountKBeta,
+};
+
+template <typename T>
+VAddr InitializeSlabHeap(Core::System& system, KMemoryLayout& memory_layout, VAddr address,
+                         size_t num_objects) {
+    const size_t size = Common::AlignUp(sizeof(T) * num_objects, alignof(void*));
+    VAddr start = Common::AlignUp(address, alignof(T));
+
+    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);
+    }
+
+    return start + size;
+}
+
+} // namespace
+
+const KSlabResourceCounts& GetSlabResourceCounts() {
+    return g_slab_resource_counts;
+}
+
+void InitializeSlabResourceCounts() {
+    // Note: Nintendo initializes all fields here, but we initialize all constants at compile-time.
+
+    if (KSystemControl::Init::ShouldIncreaseThreadResourceLimit()) {
+        g_slab_resource_counts.num_KThread += SlabCountExtraKThread;
+    }
+}
+
+size_t CalculateSlabHeapGapSize() {
+    return KernelSlabHeapGapsSize;
+}
+
+size_t CalculateTotalSlabHeapSize() {
+    size_t size = 0;
+
+#define ADD_SLAB_SIZE(NAME, COUNT, ...)                                                            \
+    {                                                                                              \
+        size += alignof(NAME);                                                                     \
+        size += Common::AlignUp(sizeof(NAME) * (COUNT), alignof(void*));                           \
+    };
+
+    // Add the size required for each slab.
+    FOREACH_SLAB_TYPE(ADD_SLAB_SIZE)
+
+#undef ADD_SLAB_SIZE
+
+    // Add the reserved size.
+    size += CalculateSlabHeapGapSize();
+
+    return size;
+}
+
+void InitializeSlabHeaps(Core::System& system, KMemoryLayout& memory_layout) {
+    // Get the start of the slab region, since that's where we'll be working.
+    VAddr address = memory_layout.GetSlabRegionAddress();
+
+    // Initialize slab type array to be in sorted order.
+    KSlabType slab_types[KSlabType_Count];
+    for (size_t i = 0; i < Common::Size(slab_types); i++) {
+        slab_types[i] = static_cast<KSlabType>(i);
+    }
+
+    // N shuffles the slab type array with the following simple algorithm.
+    for (size_t i = 0; i < Common::Size(slab_types); i++) {
+        const size_t rnd = KSystemControl::GenerateRandomRange(0, Common::Size(slab_types) - 1);
+        std::swap(slab_types[i], slab_types[rnd]);
+    }
+
+    // Create an array to represent the gaps between the slabs.
+    const size_t total_gap_size = CalculateSlabHeapGapSize();
+    size_t slab_gaps[Common::Size(slab_types)];
+    for (size_t i = 0; i < Common::Size(slab_gaps); i++) {
+        // Note: This is an off-by-one error from Nintendo's intention, because GenerateRandomRange
+        // is inclusive. However, Nintendo also has the off-by-one error, and it's "harmless", so we
+        // will include it ourselves.
+        slab_gaps[i] = KSystemControl::GenerateRandomRange(0, total_gap_size);
+    }
+
+    // Sort the array, so that we can treat differences between values as offsets to the starts of
+    // slabs.
+    for (size_t i = 1; i < Common::Size(slab_gaps); i++) {
+        for (size_t j = i; j > 0 && slab_gaps[j - 1] > slab_gaps[j]; j--) {
+            std::swap(slab_gaps[j], slab_gaps[j - 1]);
+        }
+    }
+
+    for (size_t i = 0; i < Common::Size(slab_types); i++) {
+        // Add the random gap to the address.
+        address += (i == 0) ? slab_gaps[0] : slab_gaps[i] - slab_gaps[i - 1];
+
+#define INITIALIZE_SLAB_HEAP(NAME, COUNT, ...)                                                     \
+    case KSlabType_##NAME:                                                                         \
+        address = InitializeSlabHeap<NAME>(system, memory_layout, address, COUNT);                 \
+        break;
+
+        // Initialize the slabheap.
+        switch (slab_types[i]) {
+            // For each of the slab types, we want to initialize that heap.
+            FOREACH_SLAB_TYPE(INITIALIZE_SLAB_HEAP)
+            // If we somehow get an invalid type, abort.
+        default:
+            UNREACHABLE();
+        }
+    }
+}
+
+} // namespace Kernel::Init
diff --git a/src/core/hle/kernel/init/init_slab_setup.h b/src/core/hle/kernel/init/init_slab_setup.h
new file mode 100644
index 000000000..6418b97ac
--- /dev/null
+++ b/src/core/hle/kernel/init/init_slab_setup.h
@@ -0,0 +1,42 @@
+// Copyright 2021 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+namespace Core {
+class System;
+} // namespace Core
+
+namespace Kernel {
+class KMemoryLayout;
+} // namespace Kernel
+
+namespace Kernel::Init {
+
+struct KSlabResourceCounts {
+    size_t num_KProcess;
+    size_t num_KThread;
+    size_t num_KEvent;
+    size_t num_KInterruptEvent;
+    size_t num_KPort;
+    size_t num_KSharedMemory;
+    size_t num_KTransferMemory;
+    size_t num_KCodeMemory;
+    size_t num_KDeviceAddressSpace;
+    size_t num_KSession;
+    size_t num_KLightSession;
+    size_t num_KObjectName;
+    size_t num_KResourceLimit;
+    size_t num_KDebug;
+    size_t num_KAlpha;
+    size_t num_KBeta;
+};
+
+void InitializeSlabResourceCounts();
+const KSlabResourceCounts& GetSlabResourceCounts();
+
+size_t CalculateTotalSlabHeapSize();
+void InitializeSlabHeaps(Core::System& system, KMemoryLayout& memory_layout);
+
+} // namespace Kernel::Init