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linux-next/include/asm-m68k/virtconvert.h
Roman Zippel 12d810c1b8 m68k: discontinuous memory support
Fix support for discontinuous memory

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-31 07:58:14 -07:00

55 lines
1.2 KiB
C

#ifndef __VIRT_CONVERT__
#define __VIRT_CONVERT__
/*
* Macros used for converting between virtual and physical mappings.
*/
#ifdef __KERNEL__
#include <linux/compiler.h>
#include <linux/mmzone.h>
#include <asm/setup.h>
#include <asm/page.h>
/*
* Change virtual addresses to physical addresses and vv.
*/
static inline unsigned long virt_to_phys(void *address)
{
return __pa(address);
}
static inline void *phys_to_virt(unsigned long address)
{
return __va(address);
}
/* Permanent address of a page. */
#ifdef CONFIG_SINGLE_MEMORY_CHUNK
#define page_to_phys(page) \
__pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
#else
#define page_to_phys(_page) ({ \
struct page *__page = _page; \
struct pglist_data *pgdat; \
pgdat = pg_data_table[page_to_nid(__page)]; \
page_to_pfn(__page) << PAGE_SHIFT; \
})
#endif
/*
* IO bus memory addresses are 1:1 with the physical address,
* except on the PCI bus of the Hades.
*/
#ifdef CONFIG_HADES
#define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
#define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
#else
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
#endif
#endif
#endif