12d810c1b8
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>
54 lines
1.2 KiB
C
54 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
|