1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_PFN_H_ 3 #define _LINUX_PFN_H_ 4 5 #ifndef __ASSEMBLY__ 6 #include <linux/types.h> 7 8 /* 9 * pfn_t: encapsulates a page-frame number that is optionally backed 10 * by memmap (struct page). Whether a pfn_t has a 'struct page' 11 * backing is indicated by flags in the high bits of the value. 12 */ 13 typedef struct { 14 u64 val; 15 } pfn_t; 16 #endif 17 18 #define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK) 19 #define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) 20 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 21 #define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT) 22 #define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT)) 23 24 #endif 25