mm: refactor pmm -> page

kernel-src/include/kernel/page.h

@@ -0,0 +1,57 @@
+#ifndef _PAGE_H
+#define _PAGE_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#define MEMORY_SECTION_COUNT 3
+#define MEMORY_SECTION_1MB 0
+#define MEMORY_SECTION_4GB 1
+#define MEMORY_SECTION_DEFAULT 2
+
+#define PAGE_FLAGS_FREE 1
+#define PAGE_FLAGS_TRUNCATED 2
+#define PAGE_FLAGS_PINNED 4
+#define PAGE_FLAGS_DIRTY 8
+#define PAGE_FLAGS_READY 16
+#define PAGE_FLAGS_ERROR 32
+#define PAGE_FLAGS_VNODE_SYNCING 64
+
+typedef struct page_t {
+	struct vnode_t *backing;
+	uintmax_t offset;
+	struct page_t *hashnext;
+	struct page_t *hashprev;
+	struct page_t *vnodenext;
+	struct page_t *vnodeprev;
+	union {
+		struct {
+			struct page_t *freenext;
+			struct page_t *freeprev;
+		};
+		struct {
+			struct page_t *writenext;
+			struct page_t *writeprev;
+		};
+	};
+	uintmax_t refcount;
+	int flags;
+} page_t;
+
+void *mm_alloc_page(int section);
+page_t *mm_get_page(void *addr);
+void *mm_get_page_address(page_t *);
+void mm_hold_page(void *addr);
+void mm_release_page(void *addr);
+void mm_force_free_page(void *address, size_t count);
+void *mm_alloc_pages(size_t size, int section);
+void mm_release_range(void *addr, size_t size);
+void mm_page_init();
+void mm_get_page_statistics(size_t *total_pages, size_t *free_pages);
+
+extern uintptr_t hhdmbase;
+
+#define MAKE_HHDM(x) (void *)((uintptr_t)x + hhdmbase)
+#define FROM_HHDM(x) (void *)((uintptr_t)x - hhdmbase)
+
+#endif