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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 MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
48 #if TASK_SIZE > MODULES_VADDR
49 #error Top of user space clashes with start of module space
53 * The highmem pkmap virtual space shares the end of the module area.
56 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
58 #define MODULES_END (PAGE_OFFSET)
62 * The XIP kernel gets mapped at the bottom of the module vm area.
63 * Since we use sections to map it, this macro replaces the physical address
64 * with its virtual address while keeping offset from the base section.
66 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
69 * Allow 16MB-aligned ioremap pages
71 #define IOREMAP_MAX_ORDER 24
73 #else /* CONFIG_MMU */
76 * The limitation of user task size can grow up to the end of free ram region.
77 * It is difficult to define and perhaps will never meet the original meaning
78 * of this define that was meant to.
79 * Fortunately, there is no reference for this in noMMU mode, for now.
82 #define TASK_SIZE (CONFIG_DRAM_SIZE)
85 #ifndef TASK_UNMAPPED_BASE
86 #define TASK_UNMAPPED_BASE UL(0x00000000)
90 #define PHYS_OFFSET (CONFIG_DRAM_BASE)
94 #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
98 #define PAGE_OFFSET (PHYS_OFFSET)
102 * The module can be at any place in ram in nommu mode.
104 #define MODULES_END (END_MEM)
105 #define MODULES_VADDR (PHYS_OFFSET)
107 #endif /* !CONFIG_MMU */
110 * Size of DMA-consistent memory region. Must be multiple of 2M,
111 * between 2MB and 14MB inclusive.
113 #ifndef CONSISTENT_DMA_SIZE
114 #define CONSISTENT_DMA_SIZE SZ_2M
118 * Physical vs virtual RAM address space conversion. These are
119 * private definitions which should NOT be used outside memory.h
120 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
122 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
123 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
126 * Convert a physical address to a Page Frame Number and back
128 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
129 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
134 * The DMA mask corresponding to the maximum bus address allocatable
135 * using GFP_DMA. The default here places no restriction on DMA
136 * allocations. This must be the smallest DMA mask in the system,
137 * so a successful GFP_DMA allocation will always satisfy this.
139 #ifndef ISA_DMA_THRESHOLD
140 #define ISA_DMA_THRESHOLD (0xffffffffULL)
143 #ifndef arch_adjust_zones
144 #define arch_adjust_zones(node,size,holes) do { } while (0)
145 #elif !defined(CONFIG_ZONE_DMA)
146 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
150 * PFNs are used to describe any physical page; this means
151 * PFN 0 == physical address 0.
153 * This is the PFN of the first RAM page in the kernel
154 * direct-mapped view. We assume this is the first page
155 * of RAM in the mem_map as well.
157 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
160 * These are *only* valid on the kernel direct mapped RAM memory.
161 * Note: Drivers should NOT use these. They are the wrong
162 * translation for translating DMA addresses. Use the driver
163 * DMA support - see dma-mapping.h.
165 static inline unsigned long virt_to_phys(void *x
)
167 return __virt_to_phys((unsigned long)(x
));
170 static inline void *phys_to_virt(unsigned long x
)
172 return (void *)(__phys_to_virt((unsigned long)(x
)));
176 * Drivers should NOT use these either.
178 #define __pa(x) __virt_to_phys((unsigned long)(x))
179 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
180 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
183 * Virtual <-> DMA view memory address translations
184 * Again, these are *only* valid on the kernel direct mapped RAM
185 * memory. Use of these is *deprecated* (and that doesn't mean
186 * use the __ prefixed forms instead.) See dma-mapping.h.
188 #ifndef __virt_to_bus
189 #define __virt_to_bus __virt_to_phys
190 #define __bus_to_virt __phys_to_virt
191 #define __pfn_to_bus(x) ((x) << PAGE_SHIFT)
194 static inline __deprecated
unsigned long virt_to_bus(void *x
)
196 return __virt_to_bus((unsigned long)x
);
199 static inline __deprecated
void *bus_to_virt(unsigned long x
)
201 return (void *)__bus_to_virt(x
);
205 * Conversion between a struct page and a physical address.
207 * Note: when converting an unknown physical address to a
208 * struct page, the resulting pointer must be validated
209 * using VALID_PAGE(). It must return an invalid struct page
210 * for any physical address not corresponding to a system
213 * page_to_pfn(page) convert a struct page * to a PFN number
214 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
215 * pfn_valid(pfn) indicates whether a PFN number is valid
217 * virt_to_page(k) convert a _valid_ virtual address to struct page *
218 * virt_addr_valid(k) indicates whether a virtual address is valid
220 #ifndef CONFIG_DISCONTIGMEM
222 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
224 #ifndef CONFIG_SPARSEMEM
225 #define pfn_valid(pfn) ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
228 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
229 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
231 #define PHYS_TO_NID(addr) (0)
233 #else /* CONFIG_DISCONTIGMEM */
236 * This is more complex. We have a set of mem_map arrays spread
239 #include <linux/numa.h>
241 #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
242 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
244 #define pfn_valid(pfn) \
246 unsigned int nid = PFN_TO_NID(pfn); \
247 int valid = nid < MAX_NUMNODES; \
249 pg_data_t *node = NODE_DATA(nid); \
250 valid = (pfn - node->node_start_pfn) < \
251 node->node_spanned_pages; \
256 #define virt_to_page(kaddr) \
257 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
259 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
262 * Common discontigmem stuff.
263 * PHYS_TO_NID is used by the ARM kernel/setup.c
265 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
268 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
269 * and returns the mem_map of that node.
271 #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
274 * Given a page frame number, find the owning node of the memory
275 * and returns the mem_map of that node.
277 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
279 #ifdef NODE_MEM_SIZE_BITS
280 #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
283 * Given a kernel address, find the home node of the underlying memory.
285 #define KVADDR_TO_NID(addr) \
286 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
289 * Given a page frame number, convert it to a node id.
291 #define PFN_TO_NID(pfn) \
292 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
295 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
296 * and returns the index corresponding to the appropriate page in the
299 #define LOCAL_MAP_NR(addr) \
300 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
302 #endif /* NODE_MEM_SIZE_BITS */
304 #endif /* !CONFIG_DISCONTIGMEM */
307 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
309 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
312 * Optional coherency support. Currently used only by selected
313 * Intel XSC3-based systems.
315 #ifndef arch_is_coherent
316 #define arch_is_coherent() 0
321 #include <asm-generic/memory_model.h>