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 #define CONSISTENT_END (0xffe00000UL)
88 #else /* CONFIG_MMU */
91 * The limitation of user task size can grow up to the end of free ram region.
92 * It is difficult to define and perhaps will never meet the original meaning
93 * of this define that was meant to.
94 * Fortunately, there is no reference for this in noMMU mode, for now.
97 #define TASK_SIZE (CONFIG_DRAM_SIZE)
100 #ifndef TASK_UNMAPPED_BASE
101 #define TASK_UNMAPPED_BASE UL(0x00000000)
105 #define END_MEM (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
109 * The module can be at any place in ram in nommu mode.
111 #define MODULES_END (END_MEM)
112 #define MODULES_VADDR PAGE_OFFSET
114 #define XIP_VIRT_ADDR(physaddr) (physaddr)
116 #endif /* !CONFIG_MMU */
119 * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
122 #ifdef CONFIG_HAVE_TCM
123 #define ITCM_OFFSET UL(0xfffe0000)
124 #define DTCM_OFFSET UL(0xfffe8000)
128 * Convert a physical address to a Page Frame Number and back
130 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
131 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
134 * Convert a page to/from a physical address
136 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
137 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
140 * Minimum guaranted alignment in pgd_alloc(). The page table pointers passed
141 * around in head.S and proc-*.S are shifted by this amount, in order to
142 * leave spare high bits for systems with physical address extension. This
143 * does not fully accomodate the 40-bit addressing capability of ARM LPAE, but
144 * gives us about 38-bits or so.
146 #ifdef CONFIG_ARM_LPAE
147 #define ARCH_PGD_SHIFT L1_CACHE_SHIFT
149 #define ARCH_PGD_SHIFT 0
151 #define ARCH_PGD_MASK ((1 << ARCH_PGD_SHIFT) - 1)
154 * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
155 * memory. This is used for XIP and NoMMU kernels, or by kernels which
156 * have their own mach/memory.h. Assembly code must always use
157 * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
159 #ifndef PLAT_PHYS_OFFSET
160 #define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
166 * Physical vs virtual RAM address space conversion. These are
167 * private definitions which should NOT be used outside memory.h
168 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
170 * PFNs are used to describe any physical page; this means
171 * PFN 0 == physical address 0.
173 #if defined(__virt_to_phys)
174 #define PHYS_OFFSET PLAT_PHYS_OFFSET
175 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
177 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
179 #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT)
182 * Constants used to force the right instruction encodings and shifts
183 * so that all we need to do is modify the 8-bit constant field.
185 #define __PV_BITS_31_24 0x81000000
186 #define __PV_BITS_7_0 0x81
188 extern unsigned long __pv_phys_pfn_offset;
189 extern u64 __pv_offset;
190 extern void fixup_pv_table(const void *, unsigned long);
191 extern const void *__pv_table_begin, *__pv_table_end;
193 #define PHYS_OFFSET ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
194 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
196 #define virt_to_pfn(kaddr) \
197 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
200 #define __pv_stub(from,to,instr,type) \
201 __asm__("@ __pv_stub\n" \
202 "1: " instr " %0, %1, %2\n" \
203 " .pushsection .pv_table,\"a\"\n" \
207 : "r" (from), "I" (type))
209 #define __pv_stub_mov_hi(t) \
210 __asm__ volatile("@ __pv_stub_mov\n" \
212 " .pushsection .pv_table,\"a\"\n" \
216 : "I" (__PV_BITS_7_0))
218 #define __pv_add_carry_stub(x, y) \
219 __asm__ volatile("@ __pv_add_carry_stub\n" \
220 "1: adds %Q0, %1, %2\n" \
221 " adc %R0, %R0, #0\n" \
222 " .pushsection .pv_table,\"a\"\n" \
226 : "r" (x), "I" (__PV_BITS_31_24) \
229 static inline phys_addr_t __virt_to_phys(unsigned long x)
233 if (sizeof(phys_addr_t) == 4) {
234 __pv_stub(x, t, "add", __PV_BITS_31_24);
237 __pv_add_carry_stub(x, t);
242 static inline unsigned long __phys_to_virt(phys_addr_t x)
247 * 'unsigned long' cast discard upper word when
248 * phys_addr_t is 64 bit, and makes sure that inline
249 * assembler expression receives 32 bit argument
250 * in place where 'r' 32 bit operand is expected.
252 __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
258 #define PHYS_OFFSET PLAT_PHYS_OFFSET
259 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
261 static inline phys_addr_t __virt_to_phys(unsigned long x)
263 return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
266 static inline unsigned long __phys_to_virt(phys_addr_t x)
268 return x - PHYS_OFFSET + PAGE_OFFSET;
271 #define virt_to_pfn(kaddr) \
272 ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
278 * These are *only* valid on the kernel direct mapped RAM memory.
279 * Note: Drivers should NOT use these. They are the wrong
280 * translation for translating DMA addresses. Use the driver
281 * DMA support - see dma-mapping.h.
283 static inline phys_addr_t virt_to_phys(const volatile void *x)
285 return __virt_to_phys((unsigned long)(x));
288 static inline void *phys_to_virt(phys_addr_t x)
290 return (void *)__phys_to_virt(x);
294 * Drivers should NOT use these either.
296 #define __pa(x) __virt_to_phys((unsigned long)(x))
297 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
298 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
300 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
303 * These are for systems that have a hardware interconnect supported alias of
304 * physical memory for idmap purposes. Most cases should leave these
307 static inline phys_addr_t __virt_to_idmap(unsigned long x)
309 if (arch_virt_to_idmap)
310 return arch_virt_to_idmap(x);
312 return __virt_to_phys(x);
315 #define virt_to_idmap(x) __virt_to_idmap((unsigned long)(x))
318 * Virtual <-> DMA view memory address translations
319 * Again, these are *only* valid on the kernel direct mapped RAM
320 * memory. Use of these is *deprecated* (and that doesn't mean
321 * use the __ prefixed forms instead.) See dma-mapping.h.
323 #ifndef __virt_to_bus
324 #define __virt_to_bus __virt_to_phys
325 #define __bus_to_virt __phys_to_virt
326 #define __pfn_to_bus(x) __pfn_to_phys(x)
327 #define __bus_to_pfn(x) __phys_to_pfn(x)
330 #ifdef CONFIG_VIRT_TO_BUS
331 static inline __deprecated unsigned long virt_to_bus(void *x)
333 return __virt_to_bus((unsigned long)x);
336 static inline __deprecated void *bus_to_virt(unsigned long x)
338 return (void *)__bus_to_virt(x);
343 * Conversion between a struct page and a physical address.
345 * page_to_pfn(page) convert a struct page * to a PFN number
346 * pfn_to_page(pfn) convert a _valid_ PFN number to struct page *
348 * virt_to_page(k) convert a _valid_ virtual address to struct page *
349 * virt_addr_valid(k) indicates whether a virtual address is valid
351 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET
353 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
354 #define virt_addr_valid(kaddr) (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
355 && pfn_valid(virt_to_pfn(kaddr)))
359 #include <asm-generic/memory_model.h>