1 files changed, 72 insertions, 0 deletions

diff --git a/src/core/hle/kernel/memory.cpp b/src/core/hle/kernel/memory.cpp
index 57e1912d3..e69b121eb 100644
--- a/src/core/hle/kernel/memory.cpp
+++ b/src/core/hle/kernel/memory.cpp
@@ -11,6 +11,7 @@
 #include "common/logging/log.h"
 
 #include "core/hle/config_mem.h"
+#include "core/hle/kernel/memory.h"
 #include "core/hle/kernel/vm_manager.h"
 #include "core/hle/result.h"
 #include "core/hle/shared_page.h"
@@ -19,6 +20,77 @@
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+namespace Kernel {
+
+static MemoryRegionInfo memory_regions[3];
+
+/// Size of the APPLICATION, SYSTEM and BASE memory regions (respectively) for each sytem
+/// memory configuration type.
+static const u32 memory_region_sizes[8][3] = {
+    // Old 3DS layouts
+    {0x04000000, 0x02C00000, 0x01400000}, // 0
+    { /* This appears to be unused. */ }, // 1
+    {0x06000000, 0x00C00000, 0x01400000}, // 2
+    {0x05000000, 0x01C00000, 0x01400000}, // 3
+    {0x04800000, 0x02400000, 0x01400000}, // 4
+    {0x02000000, 0x04C00000, 0x01400000}, // 5
+
+    // New 3DS layouts
+    {0x07C00000, 0x06400000, 0x02000000}, // 6
+    {0x0B200000, 0x02E00000, 0x02000000}, // 7
+};
+
+void MemoryInit(u32 mem_type) {
+    // TODO(yuriks): On the n3DS, all o3DS configurations (<=5) are forced to 6 instead.
+    ASSERT_MSG(mem_type <= 5, "New 3DS memory configuration aren't supported yet!");
+    ASSERT(mem_type != 1);
+
+    // The kernel allocation regions (APPLICATION, SYSTEM and BASE) are laid out in sequence, with
+    // the sizes specified in the memory_region_sizes table.
+    VAddr base = 0;
+    for (int i = 0; i < 3; ++i) {
+        memory_regions[i].base = base;
+        memory_regions[i].size = memory_region_sizes[mem_type][i];
+        memory_regions[i].linear_heap_memory = std::make_shared<std::vector<u8>>();
+
+        base += memory_regions[i].size;
+    }
+
+    // We must've allocated the entire FCRAM by the end
+    ASSERT(base == Memory::FCRAM_SIZE);
+
+    using ConfigMem::config_mem;
+    config_mem.app_mem_type = mem_type;
+    // app_mem_malloc does not always match the configured size for memory_region[0]: in case the
+    // n3DS type override is in effect it reports the size the game expects, not the real one.
+    config_mem.app_mem_alloc = memory_region_sizes[mem_type][0];
+    config_mem.sys_mem_alloc = memory_regions[1].size;
+    config_mem.base_mem_alloc = memory_regions[2].size;
+}
+
+void MemoryShutdown() {
+    for (auto& region : memory_regions) {
+        region.base = 0;
+        region.size = 0;
+        region.linear_heap_memory = nullptr;
+    }
+}
+
+MemoryRegionInfo* GetMemoryRegion(MemoryRegion region) {
+    switch (region) {
+    case MemoryRegion::APPLICATION:
+        return &memory_regions[0];
+    case MemoryRegion::SYSTEM:
+        return &memory_regions[1];
+    case MemoryRegion::BASE:
+        return &memory_regions[2];
+    default:
+        UNREACHABLE();
+    }
+}
+
+}
+
 namespace Memory {
 
 namespace {