2 * linux/include/asm-arm/memory.h
4 * Copyright (C) 2000-2002 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Note: this file should not be included by non-asm/.h files
12 #ifndef __ASM_ARM_MEMORY_H
13 #define __ASM_ARM_MEMORY_H
15 #include <linux/config.h>
16 #include <asm/arch/memory.h>
19 * PFNs are used to describe any physical page; this means
20 * PFN 0 == physical address 0.
22 * This is the PFN of the first RAM page in the kernel
23 * direct-mapped view. We assume this is the first page
24 * of RAM in the mem_map as well.
26 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
29 * These are *only* valid on the kernel direct mapped RAM memory.
31 static inline unsigned long virt_to_phys(void *x)
33 return __virt_to_phys((unsigned long)(x));
36 static inline void *phys_to_virt(unsigned long x)
38 return (void *)(__phys_to_virt((unsigned long)(x)));
41 #define __pa(x) __virt_to_phys((unsigned long)(x))
42 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
45 * Virtual <-> DMA view memory address translations
46 * Again, these are *only* valid on the kernel direct mapped RAM
47 * memory. Use of these is *depreciated*.
49 #define virt_to_bus(x) (__virt_to_bus((unsigned long)(x)))
50 #define bus_to_virt(x) ((void *)(__bus_to_virt((unsigned long)(x))))
53 * Conversion between a struct page and a physical address.
55 * Note: when converting an unknown physical address to a
56 * struct page, the resulting pointer must be validated
57 * using VALID_PAGE(). It must return an invalid struct page
58 * for any physical address not corresponding to a system
61 * page_to_pfn(page) convert a struct page * to a PFN number
62 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
63 * pfn_valid(pfn) indicates whether a PFN number is valid
65 * virt_to_page(k) convert a _valid_ virtual address to struct page *
66 * virt_addr_valid(k) indicates whether a virtual address is valid
68 #ifndef CONFIG_DISCONTIGMEM
70 #define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
71 #define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
72 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
74 #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
75 #define virt_addr_valid(kaddr) ((kaddr) >= PAGE_OFFSET && (kaddr) < (unsigned long)high_memory)
77 #define PHYS_TO_NID(addr) (0)
79 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
84 * This is more complex. We have a set of mem_map arrays spread
87 #define page_to_pfn(page) \
88 (((page) - page_zone(page)->zone_mem_map) \
89 + (page_zone(page)->zone_start_paddr >> PAGE_SHIFT))
91 #define pfn_to_page(pfn) \
92 (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
94 #define pfn_valid(pfn) \
96 unsigned int node = PFN_TO_NID(pfn); \
97 struct pglist_data *nd = NODE_DATA(node); \
98 ((node < NR_NODES) && \
99 ((pfn - (nd->node_start_paddr >> PAGE_SHIFT)) < nd->node_size));\
102 #define virt_to_page(kaddr) \
103 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
105 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < NR_NODES)
108 * Common discontigmem stuff.
109 * PHYS_TO_NID is used by the ARM kernel/setup.c
111 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
116 * VALID_PAGE returns a non-zero value if given page pointer is valid.
117 * This assumes all node's mem_maps are stored within the node they
118 * refer to. This is actually inherently buggy.
120 #define VALID_PAGE(page) \
121 ({ unsigned int node = KVADDR_TO_NID(page); \
122 ((node < NR_NODES) && \
123 ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size)); \
129 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
131 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
134 * We should really eliminate virt_to_bus() here - it's depreciated.
136 #define page_to_bus(page) (virt_to_bus(page_address(page)))