| /* virtconvert.h: virtual/physical/page address conversion |
| * |
| * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #ifndef _ASM_VIRTCONVERT_H |
| #define _ASM_VIRTCONVERT_H |
| |
| /* |
| * Macros used for converting between virtual and physical mappings. |
| */ |
| |
| #ifdef __KERNEL__ |
| |
| #include <asm/setup.h> |
| |
| #ifdef CONFIG_MMU |
| |
| #define phys_to_virt(vaddr) ((void *) ((unsigned long)(vaddr) + PAGE_OFFSET)) |
| #define virt_to_phys(vaddr) ((unsigned long) (vaddr) - PAGE_OFFSET) |
| |
| #else |
| |
| #define phys_to_virt(vaddr) ((void *) (vaddr)) |
| #define virt_to_phys(vaddr) ((unsigned long) (vaddr)) |
| |
| #endif |
| |
| #define virt_to_bus virt_to_phys |
| #define bus_to_virt phys_to_virt |
| |
| #define __page_address(page) (PAGE_OFFSET + (((page) - mem_map) << PAGE_SHIFT)) |
| #define page_to_phys(page) virt_to_phys((void *)__page_address(page)) |
| |
| #endif |
| #endif |
