Added function to construct page stack from membory map

include/pageallocator.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "memorymap.h"
 #include "types/physaddr.h"
 #include <stddef.h>
 
@@ -64,3 +65,11 @@ int free_page(struct page_stack_t *stack, physaddr_t location);
  * @return size_t 
  */
 size_t free_page_count(struct page_stack_t *stack);
+
+/**
+ * @brief Push all available pages in `map` onto the stack
+ * 
+ * @param stack 
+ * @param map 
+ */
+int initialize_page_stack(struct page_stack_t *stack, struct memory_map_t *map, size_t page_size);

src/pageallocator.c

@@ -1,4 +1,5 @@
 #include "pageallocator.h"
+#include "types/memorytype.h"
 #include "types/status.h"
 
 physaddr_t reserve_page(struct page_stack_t *stack)
@@ -27,4 +28,26 @@ int free_page(struct page_stack_t *stack, physaddr_t location)
 size_t free_page_count(struct page_stack_t *stack)
 {
     return stack->base_pointer - stack->stack_pointer;
-}
+}
+
+int initialize_page_stack(struct page_stack_t *stack, struct memory_map_t *map, size_t page_size)
+{
+    stack->total_pages = 0;
+    for(int i = 0; i < map->size; i++)
+    {
+        if(map->array[i].type != M_AVAILABLE)
+        {
+            continue;
+        }
+        size_t location = (map->array[i].location + page_size - 1) & ~(page_size - 1);
+        while(location + page_size <= map->array[i].location + map->array[i].size)
+        {
+            if(free_page(stack, location) != S_OK)
+            {
+                return S_OUT_OF_MEMORY;
+            }
+            stack->total_pages++;
+            location += page_size;
+        }
+    }
+}