Initial commit

tasks/libmem/mm/alloc_page.h

@@ -0,0 +1,36 @@
+#ifndef __ALLOC_PAGE_H__
+#define __ALLOC_PAGE_H__
+
+#include <memcache/memcache.h>
+
+/* List member to keep track of free and unused physical pages.
+ * Has PAGE_SIZE granularity */
+struct page_area {
+	struct list_head list;
+	unsigned int used;	/* Used or free */
+	unsigned int pfn;	/* Base pfn */
+	unsigned int numpages;	/* Number of pages this region covers */
+	struct mem_cache *cache;/* The cache used when freeing the page area for
+				 * quickly finding where the area is stored. */
+};
+
+struct page_allocator {
+	/* Keep track of page area lists and allocated caches for page areas. */
+	struct list_head page_area_list;
+	/* Caches of page areas that refer to any kind of data */
+	struct list_head dcache_list;
+	/* Caches of page areas that refer to cache pages */
+	struct list_head ccache_list;
+	/* A spare cache to aid when both caches are full */
+	struct mem_cache *spare;
+};
+
+/* Initialises the page allocator */
+void init_page_allocator(unsigned long start, unsigned long end);
+
+/* Page allocation functions */
+void *alloc_page(int quantity);
+void *zalloc_page(int quantity);
+int free_page(void *paddr);
+
+#endif /* __ALLOC_PAGE_H__ */