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 <linux/types.h>
19 #include <linux/sizes.h>
21 #include <asm/cache.h>
23 #ifdef CONFIG_NEED_MACH_MEMORY_H
24 #include <mach/memory.h>
28 * Allow for constants defined here to be used from assembly code
29 * by prepending the UL suffix only with actual C code compilation.
31 #define UL(x) _AC(x, UL)
33 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
34 #define PAGE_OFFSET UL(CONFIG_PAGE_OFFSET)
39 * TASK_SIZE - the maximum size of a user space task.
40 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
42 #define TASK_SIZE (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
43 #define TASK_UNMAPPED_BASE ALIGN(TASK_SIZE / 3, SZ_16M)
46 * The maximum size of a 26-bit user space task.
48 #define TASK_SIZE_26 (UL(1) << 26)
51 * The module space lives between the addresses given by TASK_SIZE
52 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
54 #ifndef CONFIG_THUMB2_KERNEL
55 #define MODULES_VADDR (PAGE_OFFSET - SZ_16M)
57 /* smaller range for Thumb-2 symbols relocation (2^24)*/
58 #define MODULES_VADDR (PAGE_OFFSET - SZ_8M)
61 #if TASK_SIZE > MODULES_VADDR
62 #error Top of user space clashes with start of module space
66 * The highmem pkmap virtual space shares the end of the module area.
69 #define MODULES_END (PAGE_OFFSET - PMD_SIZE)
71 #define MODULES_END (PAGE_OFFSET)
75 * The XIP kernel gets mapped at the bottom of the module vm area.
76 * Since we use sections to map it, this macro replaces the physical address
77 * with its virtual address while keeping offset from the base section.
79 #define XIP_VIRT_ADDR(physaddr) (MODULES_VADDR + ((physaddr) & 0x000fffff))
82 * Allow 16MB-aligned ioremap pages
84 #define IOREMAP_MAX_ORDER 24
86 #else /* CONFIG_MMU */
89 * The limitation of user task size can grow up to the end of free ram region.
90 * It is difficult to define and perhaps will never meet the original meaning
91 * of this define that was meant to.
92 * Fortunately, there is no reference for this in noMMU mode, for now.
95 #define TASK_SIZE (CONFIG_DRAM_SIZE)
98 #ifndef TASK_UNMAPPED_BASE
99 #define TASK_UNMAPPED_BASE UL(0x00000000)
103 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
107 * The module can be at any place in ram in nommu mode.
109 #define MODULES_END (END_MEM)
110 #define MODULES_VADDR PAGE_OFFSET
112 #define XIP_VIRT_ADDR(physaddr) (physaddr)
114 #endif /* !CONFIG_MMU */
117 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
120 #ifdef CONFIG_HAVE_TCM
121 #define ITCM_OFFSET UL(0xfffe0000)
122 #define DTCM_OFFSET UL(0xfffe8000)
126 * Convert a physical address to a Page Frame Number and back
128 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
129 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
132 * Convert a page to/from a physical address
134 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
135 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
138 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed
139 * around in head.S and proc-*.S are shifted by this amount, in order to
140 * leave spare high bits for systems with physical address extension. This
141 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but
142 * gives us about 38-bits or so.
144 #ifdef CONFIG_ARM_LPAE
145 #define ARCH_PGD_SHIFT L1_CACHE_SHIFT
147 #define ARCH_PGD_SHIFT 0
149 #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1)
152 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
153 * memory. This is used for XIP and NoMMU kernels, or by kernels which
154 * have their own mach/memory.h. Assembly code must always use
155 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
157 #ifndef PLAT_PHYS_OFFSET
158 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
164 * Physical vs virtual RAM address space conversion. These are
165 * private definitions which should NOT be used outside memory.h
166 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
168 * PFNs are used to describe any physical page; this means
169 * PFN 0 == physical address 0.
171 #if defined(__virt_to_phys)
172 #define PHYS_OFFSET PLAT_PHYS_OFFSET
173 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
175 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
177 #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT)
180 * Constants used to force the right instruction encodings and shifts
181 * so that all we need to do is modify the 8-bit constant field.
183 #define __PV_BITS_31_24 0x81000000
184 #define __PV_BITS_7_0 0x81
186 extern unsigned long __pv_phys_pfn_offset;
187 extern u64 __pv_offset;
188 extern void fixup_pv_table(const void *, unsigned long);
189 extern const void *__pv_table_begin, *__pv_table_end;
191 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
192 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
194 #define virt_to_pfn(kaddr) \
195 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
198 #define __pv_stub(from,to,instr,type) \
199 __asm__("@ __pv_stub\n" \
200 "1: " instr " %0, %1, %2\n" \
201 " .pushsection .pv_table,\"a\"\n" \
205 : "r" (from), "I" (type))
207 #define __pv_stub_mov_hi(t) \
208 __asm__ volatile("@ __pv_stub_mov\n" \
210 " .pushsection .pv_table,\"a\"\n" \
214 : "I" (__PV_BITS_7_0))
216 #define __pv_add_carry_stub(x, y) \
217 __asm__ volatile("@ __pv_add_carry_stub\n" \
218 "1: adds %Q0, %1, %2\n" \
219 " adc %R0, %R0, #0\n" \
220 " .pushsection .pv_table,\"a\"\n" \
224 : "r" (x), "I" (__PV_BITS_31_24) \
227 static inline phys_addr_t __virt_to_phys(unsigned long x)
231 if (sizeof(phys_addr_t) == 4) {
232 __pv_stub(x, t, "add", __PV_BITS_31_24);
235 __pv_add_carry_stub(x, t);
240 static inline unsigned long __phys_to_virt(phys_addr_t x)
245 * 'unsigned long' cast discard upper word when
246 * phys_addr_t is 64 bit, and makes sure that inline
247 * assembler expression receives 32 bit argument
248 * in place where 'r' 32 bit operand is expected.
250 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
256 #define PHYS_OFFSET PLAT_PHYS_OFFSET
257 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
259 static inline phys_addr_t __virt_to_phys(unsigned long x)
261 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
264 static inline unsigned long __phys_to_virt(phys_addr_t x)
266 return x - PHYS_OFFSET + PAGE_OFFSET;
269 #define virt_to_pfn(kaddr) \
270 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
276 * These are *only* valid on the kernel direct mapped RAM memory.
277 * Note: Drivers should NOT use these. They are the wrong
278 * translation for translating DMA addresses. Use the driver
279 * DMA support - see dma-mapping.h.
281 static inline phys_addr_t virt_to_phys(const volatile void *x)
283 return __virt_to_phys((unsigned long)(x));
286 static inline void *phys_to_virt(phys_addr_t x)
288 return (void *)__phys_to_virt(x);
292 * Drivers should NOT use these either.
294 #define __pa(x) __virt_to_phys((unsigned long)(x))
295 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
296 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
298 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
301 * These are for systems that have a hardware interconnect supported alias of
302 * physical memory for idmap purposes. Most cases should leave these
305 static inline phys_addr_t __virt_to_idmap(unsigned long x)
307 if (arch_virt_to_idmap)
308 return arch_virt_to_idmap(x);
310 return __virt_to_phys(x);
313 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
316 * Virtual <-> DMA view memory address translations
317 * Again, these are *only* valid on the kernel direct mapped RAM
318 * memory. Use of these is *deprecated* (and that doesn't mean
319 * use the __ prefixed forms instead.) See dma-mapping.h.
321 #ifndef __virt_to_bus
322 #define __virt_to_bus __virt_to_phys
323 #define __bus_to_virt __phys_to_virt
324 #define __pfn_to_bus(x) __pfn_to_phys(x)
325 #define __bus_to_pfn(x) __phys_to_pfn(x)
328 #ifdef CONFIG_VIRT_TO_BUS
329 static inline __deprecated unsigned long virt_to_bus(void *x)
331 return __virt_to_bus((unsigned long)x);
334 static inline __deprecated void *bus_to_virt(unsigned long x)
336 return (void *)__bus_to_virt(x);
341 * Conversion between a struct page and a physical address.
343 * page_to_pfn(page) convert a struct page * to a PFN number
344 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
346 * virt_to_page(k) convert a _valid_ virtual address to struct page *
347 * virt_addr_valid(k) indicates whether a virtual address is valid
349 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
351 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
352 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
353 && pfn_valid(virt_to_pfn(kaddr)))
357 #include <asm-generic/memory_model.h>