well OK

src/well.c

@@ -0,0 +1,40 @@
+#include "global.h"
+#include "entity.h"
+#include "room.h"
+
+void SetTile(u32 tileIndex, s32 tilePosition, s32 layerIndex);
+s32 GetTileType(s32 tilePosition, s32 layerIndex);
+void sub_08078B48();
+void sub_0805E780();
+
+extern Entity gLinkEntity;
+extern RoomControls gRoomControls;
+extern void (*gUnk_08124C08[])(Entity *);
+
+void sub_080A0E98(Entity* ent)
+{
+    gUnk_08124C08[ent->action](ent);
+}
+
+void sub_080A0EB0(Entity* ent)
+{
+    u32 tilePos;
+
+    ent->action = 1;
+    tilePos = (((ent->x.HALF.HI - gRoomControls.roomOriginX) >> 4) & 0x3F) | ((((ent->y.HALF.HI - gRoomControls.roomOriginY) >> 4) & 0x3F) * 64);
+    ent->field_0x80 = tilePos;
+    SetTile(16509, ent->field_0x80, 1);
+}
+
+void sub_080A0EF0(Entity* ent)
+{
+    s32 tileIndex;
+  
+    tileIndex = GetTileType(ent->field_0x80, 1);
+    if (tileIndex != 16509) {
+        sub_08078B48();
+        gLinkEntity.x.WORD = ent->x.WORD;
+        gLinkEntity.y.HALF.HI = ent->y.HALF.HI + 4;
+        sub_0805E780();
+    }
+}