mm: Add interface for memory allocating functions

Author: coditva

kernel/include/mm/memory_alloc.h

@@ -0,0 +1,42 @@
+#ifndef MEMORY_ALLOC_H_ZPNDLSE1
+#define MEMORY_ALLOC_H_ZPNDLSE1
+
+#include <types.h>
+
+/**
+ * Allocate memory of given size and return its starting address.
+ *
+ * @param   size_t      size of the memory to allocate
+ * @return  void *      address of the memory. NULL if allocation failed
+ */
+void * malloc(size_t);
+
+/**
+ * Reallocate a piece of memory with the new size.
+ *
+ * @param   void *      address of memory to reallocate
+ * @param   size_t      size of the new memory
+ * @return  void *      address of the newly reallocated memory. NULL if
+ *                      reallocation failed.
+ */
+void * realloc(void *, size_t);
+
+/**
+ * Allocates memory for the given number of array elements of the given array
+ * size. The memory is set to 0.
+ *
+ * @param   size_t      size of the array to allocate memory for
+ * @param   size_t      size of each array element
+ * @return  void *      address of the newly allocated memory. NULL if
+ *                      allocation failed.
+ */
+void * calloc(size_t, size_t);
+
+/**
+ * Free a piece of allocated memory.
+ *
+ * @param   void *      address of the allocated memory
+ */
+void free(void *);
+
+#endif /* end of include guard: MEMORY_ALLOC_H_ZPNDLSE1 */