From 963a657ad585ac3bb70d8a0f78e35ea54145eacc Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Fri, 20 Aug 2021 08:14:19 -0400
Subject: InitExpHeap

---
 arm9/lib/libnns/src/NNS_FND_expheap.c | 39 +++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'arm9/lib/libnns/src')

diff --git a/arm9/lib/libnns/src/NNS_FND_expheap.c b/arm9/lib/libnns/src/NNS_FND_expheap.c
index 70e3886a..eee4f9ca 100644
--- a/arm9/lib/libnns/src/NNS_FND_expheap.c
+++ b/arm9/lib/libnns/src/NNS_FND_expheap.c
@@ -21,6 +21,16 @@ static inline void* GetMBlockEndAddr(NNSiFndExpHeapMBlockHead* block)
     return AddU32ToPtr(GetMemPtrForMBlock(block), block->blockSize);
 }
 
+static inline void SetAllocMode(NNSiFndExpHeapHead* pExHeapHd, u16 mode)
+{
+    NNSi_FndSetBitValue(pExHeapHd->feature, 0, 1, mode);
+}
+
+static inline NNSiFndExpHeapHead* GetExpHeapHeadPtrFromHeapHead(NNSiFndHeapHead* pHHead)
+{
+    return AddU32ToPtr(pHHead, sizeof(NNSiFndHeapHead));
+}
+
 void GetRegionOfMBlock(NNSiMemRegion* region, NNSiFndExpHeapMBlockHead* block)
 {
     region->start = SubU32ToPtr(block, GetAlignmentForMBlock(block));
@@ -90,3 +100,32 @@ NNSiFndExpHeapMBlockHead* InitMBlock(const NNSiMemRegion* pRegion, u16 signature
     block->pMBHeadNext = NULL;
     return block;
 }
+
+static inline NNSiFndExpHeapMBlockHead* InitFreeMBlock(const NNSiMemRegion* region)
+{
+    return InitMBlock(region, 0x4652);
+}
+
+NNSiFndHeapHead* InitExpHeap(void* startAddress, void* endAddress, u16 optFlag)
+{
+    NNSiFndHeapHead* pHeapHd = (NNSiFndHeapHead*)startAddress;
+    NNSiFndExpHeapHead* pExpHeapHd = GetExpHeapHeadPtrFromHeapHead(pHeapHd);
+    NNSi_FndInitHeapHead(pHeapHd, 0x45585048, AddU32ToPtr(pExpHeapHd, sizeof(NNSiFndExpHeapHead)), endAddress, optFlag);
+    pExpHeapHd->groupID = 0;
+    pExpHeapHd->feature = 0;
+    SetAllocMode(pExpHeapHd, 0);
+
+    NNSiFndExpHeapMBlockHead* pMBHead;
+    NNSiMemRegion region;
+
+    region.start = pHeapHd->heapStart;
+    region.end = pHeapHd->heapEnd;
+    pMBHead = InitFreeMBlock(&region);
+
+    pExpHeapHd->mbFreeList.head = pMBHead;
+    pExpHeapHd->mbFreeList.tail = pMBHead;
+    pExpHeapHd->mbUsedList.head = NULL;
+    pExpHeapHd->mbUsedList.tail = NULL;
+
+    return pHeapHd;
+}
-- 
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