#define ADDR_TO_PAGE(x) ((uint32_t)(x) >> 12)
#define PAGE_TO_ADDR(x) ((uint32_t)(x) << 12)
+#define PAGE_TO_PTR(x) ((void*)PAGE_TO_ADDR(x))
+
+#define BYTES_TO_PAGES(x) (((uint32_t)(x) + 4095) >> 12)
void init_mem(void);
int alloc_ppage(void);
void free_ppage(int pg);
+/* allocate a number of consecutive pages */
+int alloc_ppages(int count);
+void free_ppages(int pg0, int count);
+
+/* allocate a specific range of pages.
+ * Fails (and returns -1) if any page in the requested range is not free.
+ */
int alloc_ppage_range(int start, int size);
int free_ppage_range(int start, int size);