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 <linux/config.h> 18 #include <asm/arch/memory.h> 19 20 /* 21 * PFNs are used to describe any physical page; this means 22 * PFN 0 == physical address 0. 23 * 24 * This is the PFN of the first RAM page in the kernel 25 * direct-mapped view. We assume this is the first page 26 * of RAM in the mem_map as well. 27 */ 28 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 29 30 /* 31 * These are *only* valid on the kernel direct mapped RAM memory. 32 */ 33 static inline unsigned long virt_to_phys(void *x) 34 { 35 return __virt_to_phys((unsigned long)(x)); 36 } 37 38 static inline void *phys_to_virt(unsigned long x) 39 { 40 return (void *)(__phys_to_virt((unsigned long)(x))); 41 } 42 43 #define __pa(x) __virt_to_phys((unsigned long)(x)) 44 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 45 46 /* 47 * Virtual <-> DMA view memory address translations 48 * Again, these are *only* valid on the kernel direct mapped RAM 49 * memory. Use of these is *depreciated*. 50 */ 51 #define virt_to_bus(x) (__virt_to_bus((unsigned long)(x))) 52 #define bus_to_virt(x) ((void *)(__bus_to_virt((unsigned long)(x)))) 53 54 /* 55 * Conversion between a struct page and a physical address. 56 * 57 * Note: when converting an unknown physical address to a 58 * struct page, the resulting pointer must be validated 59 * using VALID_PAGE(). It must return an invalid struct page 60 * for any physical address not corresponding to a system 61 * RAM address. 62 * 63 * page_to_pfn(page) convert a struct page * to a PFN number 64 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 65 * pfn_valid(pfn) indicates whether a PFN number is valid 66 * 67 * virt_to_page(k) convert a _valid_ virtual address to struct page * 68 * virt_addr_valid(k) indicates whether a virtual address is valid 69 */ 70 #ifndef CONFIG_DISCONTIGMEM 71 72 #define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET) 73 #define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET) 74 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 75 76 #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 77 #define virt_addr_valid(kaddr) ((kaddr) >= PAGE_OFFSET && (kaddr) < (unsigned long)high_memory) 78 79 #define PHYS_TO_NID(addr) (0) 80 81 #define VALID_PAGE(page) ((page - mem_map) < max_mapnr) 82 83 #else 84 85 /* 86 * This is more complex. We have a set of mem_map arrays spread 87 * around in memory. 88 */ 89 #define page_to_pfn(page) \ 90 (((page) - page_zone(page)->zone_mem_map) \ 91 + (page_zone(page)->zone_start_paddr >> PAGE_SHIFT)) 92 93 #define pfn_to_page(pfn) \ 94 (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT)) 95 96 #define pfn_valid(pfn) \ 97 ({ \ 98 unsigned int node = PFN_TO_NID(pfn); \ 99 struct pglist_data *nd = NODE_DATA(node); \ 100 ((node < NR_NODES) && \ 101 ((pfn - (nd->node_start_paddr >> PAGE_SHIFT)) < nd->node_size));\ 102 }) 103 104 #define virt_to_page(kaddr) \ 105 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr)) 106 107 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < NR_NODES) 108 109 /* 110 * Common discontigmem stuff. 111 * PHYS_TO_NID is used by the ARM kernel/setup.c 112 */ 113 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT) 114 115 /* 116 * 2.4 compatibility 117 * 118 * VALID_PAGE returns a non-zero value if given page pointer is valid. 119 * This assumes all node's mem_maps are stored within the node they 120 * refer to. This is actually inherently buggy. 121 */ 122 #define VALID_PAGE(page) \ 123 ({ unsigned int node = KVADDR_TO_NID(page); \ 124 ((node < NR_NODES) && \ 125 ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size)); \ 126 }) 127 128 #endif 129 130 /* 131 * We should really eliminate virt_to_bus() here - it's depreciated. 132 */ 133 #define page_to_bus(page) (virt_to_bus(page_address(page))) 134 135 #endif /* XXX###XXX */ 136 137 #endif /* __ASM_ARM_MEMORY_H */ 138