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>
20 * TASK_SIZE - the maximum size of a user space task.
21 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
23 #define TASK_SIZE (0xbf000000UL)
24 #define TASK_UNMAPPED_BASE (0x40000000UL)
28 * The maximum size of a 26-bit user space task.
30 #define TASK_SIZE_26 (0x04000000UL)
36 #define PAGE_OFFSET (0xc0000000UL)
40 * Physical vs virtual RAM address space conversion. These are
41 * private definitions which should NOT be used outside memory.h
42 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
44 #ifndef __virt_to_phys
45 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
46 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
50 * The module space lives between the addresses given by TASK_SIZE
51 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
53 #define MODULE_END (PAGE_OFFSET)
54 #define MODULE_START (MODULE_END - 16*1048576)
56 #if TASK_SIZE > MODULE_START
57 #error Top of user space clashes with start of module space
63 * The DMA mask corresponding to the maximum bus address allocatable
64 * using GFP_DMA. The default here places no restriction on DMA
65 * allocations. This must be the smallest DMA mask in the system,
66 * so a successful GFP_DMA allocation will always satisfy this.
68 #ifndef ISA_DMA_THRESHOLD
69 #define ISA_DMA_THRESHOLD (0xffffffffULL)
72 #ifndef arch_adjust_zones
73 #define arch_adjust_zones(node,size,holes) do { } while (0)
77 * PFNs are used to describe any physical page; this means
78 * PFN 0 == physical address 0.
80 * This is the PFN of the first RAM page in the kernel
81 * direct-mapped view. We assume this is the first page
82 * of RAM in the mem_map as well.
84 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
87 * These are *only* valid on the kernel direct mapped RAM memory.
88 * Note: Drivers should NOT use these. They are the wrong
89 * translation for translating DMA addresses. Use the driver
90 * DMA support - see dma-mapping.h.
92 static inline unsigned long virt_to_phys(void *x)
94 return __virt_to_phys((unsigned long)(x));
97 static inline void *phys_to_virt(unsigned long x)
99 return (void *)(__phys_to_virt((unsigned long)(x)));
103 * Drivers should NOT use these either.
105 #define __pa(x) __virt_to_phys((unsigned long)(x))
106 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
109 * Virtual <-> DMA view memory address translations
110 * Again, these are *only* valid on the kernel direct mapped RAM
111 * memory. Use of these is *deprecated*.
113 #define virt_to_bus(x) (__virt_to_bus((unsigned long)(x)))
114 #define bus_to_virt(x) ((void *)(__bus_to_virt((unsigned long)(x))))
117 * Conversion between a struct page and a physical address.
119 * Note: when converting an unknown physical address to a
120 * struct page, the resulting pointer must be validated
121 * using VALID_PAGE(). It must return an invalid struct page
122 * for any physical address not corresponding to a system
125 * page_to_pfn(page) convert a struct page * to a PFN number
126 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
127 * pfn_valid(pfn) indicates whether a PFN number is valid
129 * virt_to_page(k) convert a _valid_ virtual address to struct page *
130 * virt_addr_valid(k) indicates whether a virtual address is valid
132 #ifndef CONFIG_DISCONTIGMEM
134 #define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
135 #define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
136 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
138 #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
139 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
141 #define PHYS_TO_NID(addr) (0)
143 #else /* CONFIG_DISCONTIGMEM */
146 * This is more complex. We have a set of mem_map arrays spread
149 #include <linux/numa.h>
151 #define page_to_pfn(page) \
152 (( (page) - page_zone(page)->zone_mem_map) \
153 + page_zone(page)->zone_start_pfn)
154 #define pfn_to_page(pfn) \
155 (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
156 #define pfn_valid(pfn) (PFN_TO_NID(pfn) < MAX_NUMNODES)
158 #define virt_to_page(kaddr) \
159 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
160 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
163 * Common discontigmem stuff.
164 * PHYS_TO_NID is used by the ARM kernel/setup.c
166 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
168 #endif /* !CONFIG_DISCONTIGMEM */
171 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
173 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
176 * Optional device DMA address remapping. Do _not_ use directly!
177 * We should really eliminate virt_to_bus() here - it's deprecated.
179 #ifndef __arch_page_to_dma
180 #define page_to_dma(dev, page) ((dma_addr_t)__virt_to_bus(page_address(page)))
181 #define dma_to_virt(dev, addr) (__bus_to_virt(addr))
182 #define virt_to_dma(dev, addr) (__virt_to_bus(addr))
184 #define page_to_dma(dev, page) (__arch_page_to_dma(dev, page))
185 #define dma_to_virt(dev, addr) (__arch_dma_to_virt(dev, addr))
186 #define virt_to_dma(dev, addr) (__arch_virt_to_dma(dev, addr))