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 * The module space lives between the addresses given by TASK_SIZE
20 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
22 #define MODULE_END (PAGE_OFFSET)
23 #define MODULE_START (MODULE_END - 16*1048576)
25 #if TASK_SIZE > MODULE_START
26 #error Top of user space clashes with start of module space
32 * PFNs are used to describe any physical page; this means
33 * PFN 0 == physical address 0.
35 * This is the PFN of the first RAM page in the kernel
36 * direct-mapped view. We assume this is the first page
37 * of RAM in the mem_map as well.
39 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
42 * These are *only* valid on the kernel direct mapped RAM memory.
43 * Note: Drivers should NOT use these. They are the wrong
44 * translation for translating DMA addresses. Use the driver
45 * DMA support - see dma-mapping.h.
47 static inline unsigned long virt_to_phys(void *x)
49 return __virt_to_phys((unsigned long)(x));
52 static inline void *phys_to_virt(unsigned long x)
54 return (void *)(__phys_to_virt((unsigned long)(x)));
58 * Drivers should NOT use these either.
60 #define __pa(x) __virt_to_phys((unsigned long)(x))
61 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
64 * Virtual <-> DMA view memory address translations
65 * Again, these are *only* valid on the kernel direct mapped RAM
66 * memory. Use of these is *deprecated*.
68 #define virt_to_bus(x) (__virt_to_bus((unsigned long)(x)))
69 #define bus_to_virt(x) ((void *)(__bus_to_virt((unsigned long)(x))))
72 * Conversion between a struct page and a physical address.
74 * Note: when converting an unknown physical address to a
75 * struct page, the resulting pointer must be validated
76 * using VALID_PAGE(). It must return an invalid struct page
77 * for any physical address not corresponding to a system
80 * page_to_pfn(page) convert a struct page * to a PFN number
81 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
82 * pfn_valid(pfn) indicates whether a PFN number is valid
84 * virt_to_page(k) convert a _valid_ virtual address to struct page *
85 * virt_addr_valid(k) indicates whether a virtual address is valid
87 #ifndef CONFIG_DISCONTIGMEM
89 #define page_to_pfn(page) (((page) - mem_map) + PHYS_PFN_OFFSET)
90 #define pfn_to_page(pfn) ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
91 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
93 #define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
94 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
96 #define PHYS_TO_NID(addr) (0)
98 #else /* CONFIG_DISCONTIGMEM */
101 * This is more complex. We have a set of mem_map arrays spread
104 #include <linux/numa.h>
106 #define page_to_pfn(page) \
107 (( (page) - page_zone(page)->zone_mem_map) \
108 + page_zone(page)->zone_start_pfn)
109 #define pfn_to_page(pfn) \
110 (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
111 #define pfn_valid(pfn) (PFN_TO_NID(pfn) < MAX_NUMNODES)
113 #define virt_to_page(kaddr) \
114 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
115 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
118 * Common discontigmem stuff.
119 * PHYS_TO_NID is used by the ARM kernel/setup.c
121 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
123 #endif /* !CONFIG_DISCONTIGMEM */
126 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
128 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
131 * We should really eliminate virt_to_bus() here - it's deprecated.
133 #define page_to_bus(page) (virt_to_bus(page_address(page)))