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 #ifndef CONFIG_THUMB2_KERNEL
48 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
50 /* smaller range for Thumb-2 symbols relocation (2^24)*/
51 #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024)
54 #if TASK_SIZE > MODULES_VADDR
55 #error Top of user space clashes with start of module space
59 * The highmem pkmap virtual space shares the end of the module area.
62 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
64 #define MODULES_END (PAGE_OFFSET)
68 * The XIP kernel gets mapped at the bottom of the module vm area.
69 * Since we use sections to map it, this macro replaces the physical address
70 * with its virtual address while keeping offset from the base section.
72 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
75 * Allow 16MB-aligned ioremap pages
77 #define IOREMAP_MAX_ORDER 24
79 #else /* CONFIG_MMU */
82 * The limitation of user task size can grow up to the end of free ram region.
83 * It is difficult to define and perhaps will never meet the original meaning
84 * of this define that was meant to.
85 * Fortunately, there is no reference for this in noMMU mode, for now.
88 #define TASK_SIZE (CONFIG_DRAM_SIZE)
91 #ifndef TASK_UNMAPPED_BASE
92 #define TASK_UNMAPPED_BASE UL(0x00000000)
96 #define PHYS_OFFSET (CONFIG_DRAM_BASE)
100 #define END_MEM (CONFIG_DRAM_BASE + CONFIG_DRAM_SIZE)
104 #define PAGE_OFFSET (PHYS_OFFSET)
108 * The module can be at any place in ram in nommu mode.
110 #define MODULES_END (END_MEM)
111 #define MODULES_VADDR (PHYS_OFFSET)
113 #endif /* !CONFIG_MMU */
116 * Size of DMA-consistent memory region. Must be multiple of 2M,
117 * between 2MB and 14MB inclusive.
119 #ifndef CONSISTENT_DMA_SIZE
120 #define CONSISTENT_DMA_SIZE SZ_2M
124 * Physical vs virtual RAM address space conversion. These are
125 * private definitions which should NOT be used outside memory.h
126 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
128 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
129 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
132 * Convert a physical address to a Page Frame Number and back
134 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
135 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
140 * The DMA mask corresponding to the maximum bus address allocatable
141 * using GFP_DMA. The default here places no restriction on DMA
142 * allocations. This must be the smallest DMA mask in the system,
143 * so a successful GFP_DMA allocation will always satisfy this.
145 #ifndef ISA_DMA_THRESHOLD
146 #define ISA_DMA_THRESHOLD (0xffffffffULL)
149 #ifndef arch_adjust_zones
150 #define arch_adjust_zones(node,size,holes) do { } while (0)
151 #elif !defined(CONFIG_ZONE_DMA)
152 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
156 * PFNs are used to describe any physical page; this means
157 * PFN 0 == physical address 0.
159 * This is the PFN of the first RAM page in the kernel
160 * direct-mapped view. We assume this is the first page
161 * of RAM in the mem_map as well.
163 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
166 * These are *only* valid on the kernel direct mapped RAM memory.
167 * Note: Drivers should NOT use these. They are the wrong
168 * translation for translating DMA addresses. Use the driver
169 * DMA support - see dma-mapping.h.
171 static inline unsigned long virt_to_phys(void *x)
173 return __virt_to_phys((unsigned long)(x));
176 static inline void *phys_to_virt(unsigned long x)
178 return (void *)(__phys_to_virt((unsigned long)(x)));
182 * Drivers should NOT use these either.
184 #define __pa(x) __virt_to_phys((unsigned long)(x))
185 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
186 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
189 * Virtual <-> DMA view memory address translations
190 * Again, these are *only* valid on the kernel direct mapped RAM
191 * memory. Use of these is *deprecated* (and that doesn't mean
192 * use the __ prefixed forms instead.) See dma-mapping.h.
194 #ifndef __virt_to_bus
195 #define __virt_to_bus __virt_to_phys
196 #define __bus_to_virt __phys_to_virt
197 #define __pfn_to_bus(x) ((x) << PAGE_SHIFT)
200 static inline __deprecated unsigned long virt_to_bus(void *x)
202 return __virt_to_bus((unsigned long)x);
205 static inline __deprecated void *bus_to_virt(unsigned long x)
207 return (void *)__bus_to_virt(x);
211 * Conversion between a struct page and a physical address.
213 * Note: when converting an unknown physical address to a
214 * struct page, the resulting pointer must be validated
215 * using VALID_PAGE(). It must return an invalid struct page
216 * for any physical address not corresponding to a system
219 * page_to_pfn(page) convert a struct page * to a PFN number
220 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
222 * virt_to_page(k) convert a _valid_ virtual address to struct page *
223 * virt_addr_valid(k) indicates whether a virtual address is valid
225 #ifndef CONFIG_DISCONTIGMEM
227 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
229 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
230 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
232 #define PHYS_TO_NID(addr) (0)
234 #else /* CONFIG_DISCONTIGMEM */
237 * This is more complex. We have a set of mem_map arrays spread
240 #include <linux/numa.h>
242 #define arch_pfn_to_nid(pfn) PFN_TO_NID(pfn)
243 #define arch_local_page_offset(pfn, nid) LOCAL_MAP_NR((pfn) << PAGE_SHIFT)
245 #define virt_to_page(kaddr) \
246 (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
248 #define virt_addr_valid(kaddr) (KVADDR_TO_NID(kaddr) < MAX_NUMNODES)
251 * Common discontigmem stuff.
252 * PHYS_TO_NID is used by the ARM kernel/setup.c
254 #define PHYS_TO_NID(addr) PFN_TO_NID((addr) >> PAGE_SHIFT)
257 * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
258 * and returns the mem_map of that node.
260 #define ADDR_TO_MAPBASE(kaddr) NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
263 * Given a page frame number, find the owning node of the memory
264 * and returns the mem_map of that node.
266 #define PFN_TO_MAPBASE(pfn) NODE_MEM_MAP(PFN_TO_NID(pfn))
268 #ifdef NODE_MEM_SIZE_BITS
269 #define NODE_MEM_SIZE_MASK ((1 << NODE_MEM_SIZE_BITS) - 1)
272 * Given a kernel address, find the home node of the underlying memory.
274 #define KVADDR_TO_NID(addr) \
275 (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MEM_SIZE_BITS)
278 * Given a page frame number, convert it to a node id.
280 #define PFN_TO_NID(pfn) \
281 (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MEM_SIZE_BITS - PAGE_SHIFT))
284 * Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
285 * and returns the index corresponding to the appropriate page in the
288 #define LOCAL_MAP_NR(addr) \
289 (((unsigned long)(addr) & NODE_MEM_SIZE_MASK) >> PAGE_SHIFT)
291 #endif /* NODE_MEM_SIZE_BITS */
293 #endif /* !CONFIG_DISCONTIGMEM */
296 * For BIO. "will die". Kill me when bio_to_phys() and bvec_to_phys() die.
298 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
301 * Optional coherency support. Currently used only by selected
302 * Intel XSC3-based systems.
304 #ifndef arch_is_coherent
305 #define arch_is_coherent() 0
310 #include <asm-generic/memory_model.h>