ptos: vad: Add VAD insertions and create VALLOC VADs

Signed-off-by: Chloe M. <chloe@mensia.org>

service/ptos/mm/vad.c

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2026, Chloe M.
+ * Provided under the BSD-3 clause.
+ *
+ * Description: Virtual address descriptor management
+ * Author:      Chloe M.
+ */
+
+#include <mm/vad.h>
+
+/* Prototypes */
+static LONG VadCmp(MM_VAD *V0, MM_VAD *V1);
+
+/* RBT generation */
+RB_PROTOTYPE(VadTree, _MM_VAD, TreeLink, VadCmp);
+RB_GENERATE(VadTree, _MM_VAD, TreeLink, VadCmp);
+
+static LONG
+VadCmp(MM_VAD *V0, MM_VAD *V1)
+{
+    MM_RANGE *Range0, *Range1;
+
+    Range0 = &V0->Range;
+    Range1 = &V1->Range;
+
+    return (Range0->VirtualBase < Range1->VirtualBase)
+        ? -1
+        : Range0->VirtualBase > Range1->VirtualBase;
+}
+
+VOID
+MmVadTreeInit(MM_VAD_TREE *Tree)
+{
+    if (Tree == NULL) {
+        return;
+    }
+
+    Tree->Elements = 0;
+    RB_INIT(&Tree->Head);
+}
+
+PT_STATUS
+MmVadTreeInsert(MM_VAD_TREE *Tree, MM_VAD *Vad)
+{
+    if (Tree == NULL || Vad == NULL) {
+        return STATUS_INVALID_PARAM;
+    }
+
+    RB_INSERT(VadTree, &Tree->Head, Vad);
+    return STATUS_SUCCESS;
+}