138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
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/*
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* linux/include/asm-arm/memory.h
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*
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* Copyright (C) 2000-2002 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Note: this file should not be included by non-asm/.h files
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*/
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#ifndef __ASM_ARM_MEMORY_H
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#define __ASM_ARM_MEMORY_H
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#if 0 /* XXX###XXX */
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#include <linux/config.h>
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#include <asm/arch/memory.h>
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/*
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* PFNs are used to describe any physical page; this means
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* PFN 0 == physical address 0.
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*
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* This is the PFN of the first RAM page in the kernel
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* direct-mapped view. We assume this is the first page
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* of RAM in the mem_map as well.
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*/
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#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
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/*
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* These are *only* valid on the kernel direct mapped RAM memory.
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*/
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static inline unsigned long virt_to_phys(void *x)
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{
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return __virt_to_phys((unsigned long)(x));
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}
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static inline void *phys_to_virt(unsigned long x)
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{
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return (void *)(__phys_to_virt((unsigned long)(x)));
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}
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#define __pa(x) __virt_to_phys((unsigned long)(x))
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#define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
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/*
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* Virtual <-> DMA view memory address translations
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* Again, these are *only* valid on the kernel direct mapped RAM
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* memory. Use of these is *depreciated*.
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*/
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#define virt_to_bus(x) (__virt_to_bus((unsigned long)(x)))
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#define bus_to_virt(x) ((void *)(__bus_to_virt((unsigned long)(x))))
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/*
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* Conversion between a struct page and a physical address.
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*
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* Note: when converting an unknown physical address to a
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* struct page, the resulting pointer must be validated
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* using VALID_PAGE(). It must return an invalid struct page
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* for any physical address not corresponding to a system
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* RAM address.
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*
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* page_to_pfn(page) convert a struct page * to a PFN number
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* pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
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* pfn_valid(pfn) indicates whether a PFN number is valid
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*
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* virt_to_page(k) convert a _valid_ virtual address to struct page *
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* virt_addr_valid(k) indicates whether a virtual address is valid
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*/
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#ifndef CONFIG_DISCONTIGMEM
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#define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
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#define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
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#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
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#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
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#define virt_addr_valid(kaddr) ((kaddr) >= PAGE_OFFSET && (kaddr) < (unsigned long)high_memory)
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#define PHYS_TO_NID(addr) (0)
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#define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
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#else
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/*
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* This is more complex. We have a set of mem_map arrays spread
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* around in memory.
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*/
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#define page_to_pfn(page) \
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(((page) - page_zone(page)->zone_mem_map) \
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+ (page_zone(page)->zone_start_paddr >> PAGE_SHIFT))
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#define pfn_to_page(pfn) \
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(PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
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#define pfn_valid(pfn) \
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({ \
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unsigned int node = PFN_TO_NID(pfn); \
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struct pglist_data *nd = NODE_DATA(node); \
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((node < NR_NODES) && \
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((pfn - (nd->node_start_paddr >> PAGE_SHIFT)) < nd->node_size));\
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})
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#define virt_to_page(kaddr) \
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(ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
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#define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < NR_NODES)
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/*
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* Common discontigmem stuff.
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* PHYS_TO_NID is used by the ARM kernel/setup.c
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*/
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#define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
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/*
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* 2.4 compatibility
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*
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* VALID_PAGE returns a non-zero value if given page pointer is valid.
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* This assumes all node's mem_maps are stored within the node they
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* refer to. This is actually inherently buggy.
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*/
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#define VALID_PAGE(page) \
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({ unsigned int node = KVADDR_TO_NID(page); \
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((node < NR_NODES) && \
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((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size)); \
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})
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#endif
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/*
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* We should really eliminate virt_to_bus() here - it's depreciated.
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*/
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#define page_to_bus(page) (virt_to_bus(page_address(page)))
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#endif /* XXX###XXX */
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#endif /* __ASM_ARM_MEMORY_H */
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