1 /* 2 * linux/include/asm-arm/memory.h 3 * 4 * Copyright (C) 2000-2002 Russell King 5 * 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. 9 * 10 * Note: this file should not be included by non-asm/.h files 11 */ 12 #ifndef __ASM_ARM_MEMORY_H 13 #define __ASM_ARM_MEMORY_H 14 15 #if 0 /* XXX###XXX */ 16 17 #include <asm/arch/memory.h> 18 19 /* 20 * PFNs are used to describe any physical page; this means 21 * PFN 0 == physical address 0. 22 * 23 * This is the PFN of the first RAM page in the kernel 24 * direct-mapped view. We assume this is the first page 25 * of RAM in the mem_map as well. 26 */ 27 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 28 29 /* 30 * These are *only* valid on the kernel direct mapped RAM memory. 31 */ 32 static inline unsigned long virt_to_phys(void *x) 33 { 34 return __virt_to_phys((unsigned long)(x)); 35 } 36 37 static inline void *phys_to_virt(unsigned long x) 38 { 39 return (void *)(__phys_to_virt((unsigned long)(x))); 40 } 41 42 #define __pa(x) __virt_to_phys((unsigned long)(x)) 43 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 44 45 /* 46 * Virtual <-> DMA view memory address translations 47 * Again, these are *only* valid on the kernel direct mapped RAM 48 * memory. Use of these is *depreciated*. 49 */ 50 #define virt_to_bus(x) (__virt_to_bus((unsigned long)(x))) 51 #define bus_to_virt(x) ((void *)(__bus_to_virt((unsigned long)(x)))) 52 53 /* 54 * Conversion between a struct page and a physical address. 55 * 56 * Note: when converting an unknown physical address to a 57 * struct page, the resulting pointer must be validated 58 * using VALID_PAGE(). It must return an invalid struct page 59 * for any physical address not corresponding to a system 60 * RAM address. 61 * 62 * page_to_pfn(page) convert a struct page * to a PFN number 63 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 64 * pfn_valid(pfn) indicates whether a PFN number is valid 65 * 66 * virt_to_page(k) convert a _valid_ virtual address to struct page * 67 * virt_addr_valid(k) indicates whether a virtual address is valid 68 */ 69 #ifndef CONFIG_DISCONTIGMEM 70 71 #define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET) 72 #define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET) 73 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 74 75 #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 76 #define virt_addr_valid(kaddr) ((kaddr) >= PAGE_OFFSET && (kaddr) < (unsigned long)high_memory) 77 78 #define PHYS_TO_NID(addr) (0) 79 80 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr) 81 82 #else 83 84 /* 85 * This is more complex. We have a set of mem_map arrays spread 86 * around in memory. 87 */ 88 #define page_to_pfn(page) \ 89 (((page) - page_zone(page)->zone_mem_map) \ 90 + (page_zone(page)->zone_start_paddr >> PAGE_SHIFT)) 91 92 #define pfn_to_page(pfn) \ 93 (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT)) 94 95 #define pfn_valid(pfn) \ 96 ({ \ 97 unsigned int node = PFN_TO_NID(pfn); \ 98 struct pglist_data *nd = NODE_DATA(node); \ 99 ((node < NR_NODES) && \ 100 ((pfn - (nd->node_start_paddr >> PAGE_SHIFT)) < nd->node_size));\ 101 }) 102 103 #define virt_to_page(kaddr) \ 104 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) 105 106 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < NR_NODES) 107 108 /* 109 * Common discontigmem stuff. 110 * PHYS_TO_NID is used by the ARM kernel/setup.c 111 */ 112 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) 113 114 /* 115 * 2.4 compatibility 116 * 117 * VALID_PAGE returns a non-zero value if given page pointer is valid. 118 * This assumes all node's mem_maps are stored within the node they 119 * refer to. This is actually inherently buggy. 120 */ 121 #define VALID_PAGE(page) \ 122 ({ unsigned int node = KVADDR_TO_NID(page); \ 123 ((node < NR_NODES) && \ 124 ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size)); \ 125 }) 126 127 #endif 128 129 /* 130 * We should really eliminate virt_to_bus() here - it's depreciated. 131 */ 132 #define page_to_bus(page) (virt_to_bus(page_address(page))) 133 134 #endif /* XXX###XXX */ 135 136 #endif /* __ASM_ARM_MEMORY_H */ 137