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)
27 #define PHYS_OFFSET PLAT_PHYS_OFFSET
32 * PAGE_OFFSET - the virtual address of the start of the kernel image
33 * TASK_SIZE - the maximum size of a user space task.
34 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
36 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
37 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(0x01000000))
38 #define TASK_UNMAPPED_BASE (UL(CONFIG_PAGE_OFFSET) / 3)
41 * The maximum size of a 26-bit user space task.
43 #define TASK_SIZE_26 UL(0x04000000)
46 * The module space lives between the addresses given by TASK_SIZE
47 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
49 #ifndef CONFIG_THUMB2_KERNEL
50 #define MODULES_VADDR (PAGE_OFFSET - 16*1024*1024)
52 /* smaller range for Thumb-2 symbols relocation (2^24)*/
53 #define MODULES_VADDR (PAGE_OFFSET - 8*1024*1024)
56 #if TASK_SIZE > MODULES_VADDR
57 #error Top of user space clashes with start of module space
61 * The highmem pkmap virtual space shares the end of the module area.
64 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
66 #define MODULES_END (PAGE_OFFSET)
70 * The XIP kernel gets mapped at the bottom of the module vm area.
71 * Since we use sections to map it, this macro replaces the physical address
72 * with its virtual address while keeping offset from the base section.
74 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
77 * Allow 16MB-aligned ioremap pages
79 #define IOREMAP_MAX_ORDER 24
82 * Size of DMA-consistent memory region. Must be multiple of 2M,
83 * between 2MB and 14MB inclusive.
85 #ifndef CONSISTENT_DMA_SIZE
86 #define CONSISTENT_DMA_SIZE SZ_2M
89 #define CONSISTENT_END (0xffe00000UL)
90 #define CONSISTENT_BASE (CONSISTENT_END - CONSISTENT_DMA_SIZE)
92 #else /* CONFIG_MMU */
95 * The limitation of user task size can grow up to the end of free ram region.
96 * It is difficult to define and perhaps will never meet the original meaning
97 * of this define that was meant to.
98 * Fortunately, there is no reference for this in noMMU mode, for now.
101 #define TASK_SIZE (CONFIG_DRAM_SIZE)
104 #ifndef TASK_UNMAPPED_BASE
105 #define TASK_UNMAPPED_BASE UL(0x00000000)
109 #define PHYS_OFFSET UL(CONFIG_DRAM_BASE)
113 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
117 #define PAGE_OFFSET (PHYS_OFFSET)
121 * The module can be at any place in ram in nommu mode.
123 #define MODULES_END (END_MEM)
124 #define MODULES_VADDR (PHYS_OFFSET)
126 #endif /* !CONFIG_MMU */
129 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
132 #ifdef CONFIG_HAVE_TCM
133 #define ITCM_OFFSET UL(0xfffe0000)
134 #define DTCM_OFFSET UL(0xfffe8000)
138 * Physical vs virtual RAM address space conversion. These are
139 * private definitions which should NOT be used outside memory.h
140 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
142 #ifndef __virt_to_phys
143 #define __virt_to_phys(x) ((x) - PAGE_OFFSET + PHYS_OFFSET)
144 #define __phys_to_virt(x) ((x) - PHYS_OFFSET + PAGE_OFFSET)
148 * Convert a physical address to a Page Frame Number and back
150 #define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
151 #define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
154 * Convert a page to/from a physical address
156 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
157 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
162 * The DMA mask corresponding to the maximum bus address allocatable
163 * using GFP_DMA. The default here places no restriction on DMA
164 * allocations. This must be the smallest DMA mask in the system,
165 * so a successful GFP_DMA allocation will always satisfy this.
167 #ifndef ISA_DMA_THRESHOLD
168 #define ISA_DMA_THRESHOLD (0xffffffffULL)
171 #ifndef arch_adjust_zones
172 #define arch_adjust_zones(size,holes) do { } while (0)
173 #elif !defined(CONFIG_ZONE_DMA)
174 #error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
178 * PFNs are used to describe any physical page; this means
179 * PFN 0 == physical address 0.
181 * This is the PFN of the first RAM page in the kernel
182 * direct-mapped view. We assume this is the first page
183 * of RAM in the mem_map as well.
185 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
188 * These are *only* valid on the kernel direct mapped RAM memory.
189 * Note: Drivers should NOT use these. They are the wrong
190 * translation for translating DMA addresses. Use the driver
191 * DMA support - see dma-mapping.h.
193 static inline unsigned long virt_to_phys(const volatile void *x)
195 return __virt_to_phys((unsigned long)(x));
198 static inline void *phys_to_virt(unsigned long x)
200 return (void *)(__phys_to_virt((unsigned long)(x)));
204 * Drivers should NOT use these either.
206 #define __pa(x) __virt_to_phys((unsigned long)(x))
207 #define __va(x) ((void *)__phys_to_virt((unsigned long)(x)))
208 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
211 * Virtual <-> DMA view memory address translations
212 * Again, these are *only* valid on the kernel direct mapped RAM
213 * memory. Use of these is *deprecated* (and that doesn't mean
214 * use the __ prefixed forms instead.) See dma-mapping.h.
216 #ifndef __virt_to_bus
217 #define __virt_to_bus __virt_to_phys
218 #define __bus_to_virt __phys_to_virt
219 #define __pfn_to_bus(x) __pfn_to_phys(x)
220 #define __bus_to_pfn(x) __phys_to_pfn(x)
223 static inline __deprecated unsigned long virt_to_bus(void *x)
225 return __virt_to_bus((unsigned long)x);
228 static inline __deprecated void *bus_to_virt(unsigned long x)
230 return (void *)__bus_to_virt(x);
234 * Conversion between a struct page and a physical address.
236 * Note: when converting an unknown physical address to a
237 * struct page, the resulting pointer must be validated
238 * using VALID_PAGE(). It must return an invalid struct page
239 * for any physical address not corresponding to a system
242 * page_to_pfn(page) convert a struct page * to a PFN number
243 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
245 * virt_to_page(k) convert a _valid_ virtual address to struct page *
246 * virt_addr_valid(k) indicates whether a virtual address is valid
248 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
250 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
251 #define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
254 * Optional coherency support. Currently used only by selected
255 * Intel XSC3-based systems.
257 #ifndef arch_is_coherent
258 #define arch_is_coherent() 0
263 #include <asm-generic/memory_model.h>