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/*

 *  linux/include/asm-arm/memory.h

 *

 *  Copyright (C) 2000-2002 Russell King

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 *  Note: this file should not be included by non-asm/.h files

 */

#ifndef __ASM_ARM_MEMORY_H

#define __ASM_ARM_MEMORY_H

#include <linux/config.h>

#include <asm/arch/memory.h>

/*

 * PFNs are used to describe any physical page; this means

 * PFN 0 == physical address 0.

 *

 * This is the PFN of the first RAM page in the kernel

 * direct-mapped view.  We assume this is the first page

 * of RAM in the mem_map as well.

 */

#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)

/*

 * These are *only* valid on the kernel direct mapped RAM memory.

 */

static inline unsigned long virt_to_phys(void *x)

{

        return __virt_to_phys((unsigned long)(x));

}

static inline void *phys_to_virt(unsigned long x)

{

        return (void *)(__phys_to_virt((unsigned long)(x)));

}

#define __pa(x)                 __virt_to_phys((unsigned long)(x))

#define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))

/*

 * Virtual <-> DMA view memory address translations

 * Again, these are *only* valid on the kernel direct mapped RAM

 * memory.  Use of these is *depreciated*.

 */

#define virt_to_bus(x)          (__virt_to_bus((unsigned long)(x)))

#define bus_to_virt(x)          ((void *)(__bus_to_virt((unsigned long)(x))))

/*

 * Conversion between a struct page and a physical address.

 *

 * Note: when converting an unknown physical address to a

 * struct page, the resulting pointer must be validated

 * using VALID_PAGE().  It must return an invalid struct page

 * for any physical address not corresponding to a system

 * RAM address.

 *

 *  page_to_pfn(page)   convert a struct page * to a PFN number

 *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *

 *  pfn_valid(pfn)      indicates whether a PFN number is valid

 *

 *  virt_to_page(k)     convert a _valid_ virtual address to struct page *

 *  virt_addr_valid(k)  indicates whether a virtual address is valid

 */

#ifndef CONFIG_DISCONTIGMEM

#define page_to_pfn(page)       (((page) - mem_map) + PHYS_PFN_OFFSET)

#define pfn_to_page(pfn)        ((mem_map + (pfn)) - PHYS_PFN_OFFSET)

#define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))

#define virt_to_page(kaddr)     (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))

#define virt_addr_valid(kaddr)  ((kaddr) >= PAGE_OFFSET && (kaddr) < (unsigned long)high_memory)

#define PHYS_TO_NID(addr)       (0)

#define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)

#else

/*

 * This is more complex.  We have a set of mem_map arrays spread

 * around in memory.

 */

#define page_to_pfn(page)                                       \

        (((page) - page_zone(page)->zone_mem_map)               \

          + (page_zone(page)->zone_start_paddr >> PAGE_SHIFT))

#define pfn_to_page(pfn)                                        \

        (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))

#define pfn_valid(pfn)                                          \

  ({                                                            \

        unsigned int node = PFN_TO_NID(pfn);                    \

        struct pglist_data *nd = NODE_DATA(node);               \

        ((node < NR_NODES) &&                                   \

         ((pfn - (nd->node_start_paddr >> PAGE_SHIFT)) < nd->node_size));\

   })

#define virt_to_page(kaddr)                                     \

        (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))

#define virt_addr_valid(kaddr)  (KVADDR_TO_NID(kaddr) < NR_NODES)

/*

 * Common discontigmem stuff.

 *  PHYS_TO_NID is used by the ARM kernel/setup.c

 */

#define PHYS_TO_NID(addr)       PFN_TO_NID((addr) >> PAGE_SHIFT)

/*

 * 2.4 compatibility

 *

 * VALID_PAGE returns a non-zero value if given page pointer is valid.

 * This assumes all node's mem_maps are stored within the node they

 * refer to.  This is actually inherently buggy.

 */

#define VALID_PAGE(page) \

({ unsigned int node = KVADDR_TO_NID(page); \

   ((node < NR_NODES) && \

     ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size)); \

})

#endif

/*

 * For BIO.  "will die".  Kill me when bio_to_phys() and bvec_to_phys() die.

 */

#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)

/*

 * We should really eliminate virt_to_bus() here - it's depreciated.

 */

#define page_to_bus(page)       (virt_to_bus(page_address(page)))

#endif