2 * arch/arm/include/asm/memory.h
4 * Copyright (C) 2000-2002 Russell King
5 * modification for nommu, Hyok S. Choi, 2004
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * Note: this file should not be included by non-asm/.h files
13 #ifndef __ASM_ARM_MEMORY_H
14 #define __ASM_ARM_MEMORY_H
16 #include <linux/compiler.h>
17 #include <linux/const.h>
18 #include <mach/memory.h>
19 #include <asm/sizes.h>
22 * Allow for constants defined here to be used from assembly code
23 * by prepending the UL suffix only with actual C code compilation.
25 #define UL(x) _AC(x, UL)
30 * PAGE_OFFSET - the virtual address of the start of the kernel image
31 * TASK_SIZE - the maximum size of a user space task.
32 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
34 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
35 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
36 #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3)
39 * The maximum size of a 26-bit user space task.
41 #define TASK_SIZE_26 UL(0x04000000)
44 * The module space lives between the addresses given by TASK_SIZE
45 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
47 #define MODULE_END (PAGE_OFFSET)
48 #define MODULE_START (MODULE_END - 16*1048576)
50 #if TASK_SIZE > MODULE_START
51 #error Top of user space clashes with start of module space
55 * The XIP kernel gets mapped at the bottom of the module vm area.
56 * Since we use sections to map it, this macro replaces the physical address
57 * with its virtual address while keeping offset from the base section.
59 #define XIP_VIRT_ADDR(physaddr) (MODULE_START + ((physaddr) & 0x000fffff))
62 * Allow 16MB-aligned ioremap pages
64 #define IOREMAP_MAX_ORDER 24
66 #else /* CONFIG_MMU */
69 * The limitation of user task size can grow up to the end of free ram region.
70 * It is difficult to define and perhaps will never meet the original meaning
71 * of this define that was meant to.
72 * Fortunately, there is no reference for this in noMMU mode, for now.
75 #define TASK_SIZE (CONFIG_DRAM_SIZE)
78 #ifndef TASK_UNMAPPED_BASE
79 #define TASK_UNMAPPED_BASE UL(0x00000000)
83 #define PHYS_OFFSET (CONFIG_DRAM_BASE)
87 #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
91 #define PAGE_OFFSET (PHYS_OFFSET)
95 * The module can be at any place in ram in nommu mode.
97 #define MODULE_END (END_MEM)
98 #define MODULE_START (PHYS_OFFSET)
100 #endif /* !CONFIG_MMU */
103 * Size of DMA-consistent memory region. Must be multiple of 2M,
104 * between 2MB and 14MB inclusive.
106 #ifndef CONSISTENT_DMA_SIZE
107 #define CONSISTENT_DMA_SIZE SZ_2M
111 * Physical vs virtual RAM address space conversion. These are
112 * private definitions which should NOT be used outside memory.h
113 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
115 #ifndef __virt_to_phys
116 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
117 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
121 * Convert a physical address to a Page Frame Number and back
123 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
124 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
129 * The DMA mask corresponding to the maximum bus address allocatable
130 * using GFP_DMA. The default here places no restriction on DMA
131 * allocations. This must be the smallest DMA mask in the system,
132 * so a successful GFP_DMA allocation will always satisfy this.
134 #ifndef ISA_DMA_THRESHOLD
135 #define ISA_DMA_THRESHOLD (0xffffffffULL)
138 #ifndef arch_adjust_zones
139 #define arch_adjust_zones(node,size,holes) do { } while (0)
143 * PFNs are used to describe any physical page; this means
144 * PFN 0 == physical address 0.
146 * This is the PFN of the first RAM page in the kernel
147 * direct-mapped view. We assume this is the first page
148 * of RAM in the mem_map as well.
150 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
153 * These are *only* valid on the kernel direct mapped RAM memory.
154 * Note: Drivers should NOT use these. They are the wrong
155 * translation for translating DMA addresses. Use the driver
156 * DMA support - see dma-mapping.h.
158 static inline unsigned long virt_to_phys(void *x)
160 return __virt_to_phys((unsigned long)(x));
163 static inline void *phys_to_virt(unsigned long x)
165 return (void *)(__phys_to_virt((unsigned long)(x)));
169 * Drivers should NOT use these either.
171 #define __pa(x) __virt_to_phys((unsigned long)(x))
172 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
173 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
176 * Virtual <-> DMA view memory address translations
177 * Again, these are *only* valid on the kernel direct mapped RAM
178 * memory. Use of these is *deprecated* (and that doesn't mean
179 * use the __ prefixed forms instead.) See dma-mapping.h.
181 static inline __deprecated unsigned long virt_to_bus(void *x)
183 return __virt_to_bus((unsigned long)x);
186 static inline __deprecated void *bus_to_virt(unsigned long x)
188 return (void *)__bus_to_virt(x);
192 * Conversion between a struct page and a physical address.
194 * Note: when converting an unknown physical address to a
195 * struct page, the resulting pointer must be validated
196 * using VALID_PAGE(). It must return an invalid struct page
197 * for any physical address not corresponding to a system
200 * page_to_pfn(page) convert a struct page * to a PFN number
201 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
202 * pfn_valid(pfn) indicates whether a PFN number is valid
204 * virt_to_page(k) convert a _valid_ virtual address to struct page *
205 * virt_addr_valid(k) indicates whether a virtual address is valid
207 #ifndef CONFIG_DISCONTIGMEM
209 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
211 #ifndef CONFIG_SPARSEMEM
212 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
215 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
216 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
218 #define PHYS_TO_NID(addr) (0)
220 #else /* CONFIG_DISCONTIGMEM */
223 * This is more complex. We have a set of mem_map arrays spread
226 #include <linux/numa.h>
228 #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
229 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
231 #define pfn_valid(pfn) \
233 unsigned int nid = PFN_TO_NID(pfn); \
234 int valid = nid < MAX_NUMNODES; \
236 pg_data_t *node = NODE_DATA(nid); \
237 valid = (pfn - node->node_start_pfn) < \
238 node->node_spanned_pages; \
243 #define virt_to_page(kaddr) \
244 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
246 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
249 * Common discontigmem stuff.
250 * PHYS_TO_NID is used by the ARM kernel/setup.c
252 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
255 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
256 * and returns the mem_map of that node.
258 #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
261 * Given a page frame number, find the owning node of the memory
262 * and returns the mem_map of that node.
264 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
266 #ifdef NODE_MEM_SIZE_BITS
267 #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
270 * Given a kernel address, find the home node of the underlying memory.
272 #define KVADDR_TO_NID(addr) \
273 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
276 * Given a page frame number, convert it to a node id.
278 #define PFN_TO_NID(pfn) \
279 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
282 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
283 * and returns the index corresponding to the appropriate page in the
286 #define LOCAL_MAP_NR(addr) \
287 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
289 #endif /* NODE_MEM_SIZE_BITS */
291 #endif /* !CONFIG_DISCONTIGMEM */
294 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
296 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
299 * Optional coherency support. Currently used only by selected
300 * Intel XSC3-based systems.
302 #ifndef arch_is_coherent
303 #define arch_is_coherent() 0
308 #include <asm-generic/memory_model.h>