1/* 2 * linux/include/asm-arm26/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/* 16 * User space: 26MB 17 */ 18#define TASK_SIZE (0x01a00000UL) 19 20/* 21 * This decides where the kernel will search for a free chunk of vm 22 * space during mmap's. 23 */ 24#define TASK_UNMAPPED_BASE (TASK_SIZE / 3) 25 26/* 27 * Page offset: 32MB 28 */ 29#define PAGE_OFFSET (0x02000000UL) 30#define PHYS_OFFSET (0x02000000UL) 31 32#define PHYS_TO_NID(addr) (0) 33 34/* 35 * PFNs are used to describe any physical page; this means 36 * PFN 0 == physical address 0. 37 * 38 * This is the PFN of the first RAM page in the kernel 39 * direct-mapped view. We assume this is the first page 40 * of RAM in the mem_map as well. 41 */ 42#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 43 44/* 45 * These are *only* valid on the kernel direct mapped RAM memory. 46 */ 47static inline unsigned long virt_to_phys(void *x) 48{ 49 return (unsigned long)x; 50} 51 52static inline void *phys_to_virt(unsigned long x) 53{ 54 return (void *)((unsigned long)x); 55} 56 57#define __pa(x) (unsigned long)(x) 58#define __va(x) ((void *)(unsigned long)(x)) 59 60/* 61 * Virtual <-> DMA view memory address translations 62 * Again, these are *only* valid on the kernel direct mapped RAM 63 * memory. Use of these is *deprecated*. 64 */ 65#define virt_to_bus(x) ((unsigned long)(x)) 66#define bus_to_virt(x) ((void *)((unsigned long)(x))) 67 68/* 69 * Conversion between a struct page and a physical address. 70 * 71 * Note: when converting an unknown physical address to a 72 * struct page, the resulting pointer must be validated 73 * using VALID_PAGE(). It must return an invalid struct page 74 * for any physical address not corresponding to a system 75 * RAM address. 76 * 77 * page_to_pfn(page) convert a struct page * to a PFN number 78 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page * 79 * pfn_valid(pfn) indicates whether a PFN number is valid 80 * 81 * virt_to_page(k) convert a _valid_ virtual address to struct page * 82 * virt_addr_valid(k) indicates whether a virtual address is valid 83 */ 84#define ARCH_PFN_OFFSET (PHYS_PFN_OFFSET) 85#define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr)) 86 87#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 88#define virt_addr_valid(kaddr) ((int)(kaddr) >= PAGE_OFFSET && (int)(kaddr) < (unsigned long)high_memory) 89 90/* 91 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die. 92 */ 93#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 94 95/* 96 * We should really eliminate virt_to_bus() here - it's deprecated. 97 */ 98#define page_to_bus(page) (page_address(page)) 99 100#include <asm-generic/memory_model.h> 101#endif 102