137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*
|
|
* 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
|
|
|
|
#if 0 /* XXX###XXX */
|
|
|
|
#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 *deprecated*.
|
|
*/
|
|
#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
|
|
|
|
/*
|
|
* We should really eliminate virt_to_bus() here - it's deprecated.
|
|
*/
|
|
#define page_to_bus(page) (virt_to_bus(page_address(page)))
|
|
|
|
#endif /* XXX###XXX */
|
|
|
|
#endif /* __ASM_ARM_MEMORY_H */
|