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Linux/arch/arm/include/asm/memory.h

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  1 /*
  2  *  arch/arm/include/asm/memory.h
  3  *
  4  *  Copyright (C) 2000-2002 Russell King
  5  *  modification for nommu, Hyok S. Choi, 2004
  6  *
  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.
 10  *
 11  *  Note: this file should not be included by non-asm/.h files
 12  */
 13 #ifndef __ASM_ARM_MEMORY_H
 14 #define __ASM_ARM_MEMORY_H
 15 
 16 #include <linux/compiler.h>
 17 #include <linux/const.h>
 18 #include <linux/types.h>
 19 #include <linux/sizes.h>
 20 
 21 #include <asm/cache.h>
 22 
 23 #ifdef CONFIG_NEED_MACH_MEMORY_H
 24 #include <mach/memory.h>
 25 #endif
 26 
 27 /*
 28  * Allow for constants defined here to be used from assembly code
 29  * by prepending the UL suffix only with actual C code compilation.
 30  */
 31 #define UL(x) _AC(x, UL)
 32 
 33 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
 34 #define PAGE_OFFSET             UL(CONFIG_PAGE_OFFSET)
 35 
 36 #ifdef CONFIG_MMU
 37 
 38 /*
 39  * TASK_SIZE - the maximum size of a user space task.
 40  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
 41  */
 42 #define TASK_SIZE               (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
 43 #define TASK_UNMAPPED_BASE      ALIGN(TASK_SIZE / 3, SZ_16M)
 44 
 45 /*
 46  * The maximum size of a 26-bit user space task.
 47  */
 48 #define TASK_SIZE_26            (UL(1) << 26)
 49 
 50 /*
 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.
 53  */
 54 #ifndef CONFIG_THUMB2_KERNEL
 55 #define MODULES_VADDR           (PAGE_OFFSET - SZ_16M)
 56 #else
 57 /* smaller range for Thumb-2 symbols relocation (2^24)*/
 58 #define MODULES_VADDR           (PAGE_OFFSET - SZ_8M)
 59 #endif
 60 
 61 #if TASK_SIZE > MODULES_VADDR
 62 #error Top of user space clashes with start of module space
 63 #endif
 64 
 65 /*
 66  * The highmem pkmap virtual space shares the end of the module area.
 67  */
 68 #ifdef CONFIG_HIGHMEM
 69 #define MODULES_END             (PAGE_OFFSET - PMD_SIZE)
 70 #else
 71 #define MODULES_END             (PAGE_OFFSET)
 72 #endif
 73 
 74 /*
 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.
 78  */
 79 #define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
 80 
 81 /*
 82  * Allow 16MB-aligned ioremap pages
 83  */
 84 #define IOREMAP_MAX_ORDER       24
 85 
 86 #define CONSISTENT_END          (0xffe00000UL)
 87 
 88 #else /* CONFIG_MMU */
 89 
 90 /*
 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.
 95  */
 96 #ifndef TASK_SIZE
 97 #define TASK_SIZE               (CONFIG_DRAM_SIZE)
 98 #endif
 99 
100 #ifndef TASK_UNMAPPED_BASE
101 #define TASK_UNMAPPED_BASE      UL(0x00000000)
102 #endif
103 
104 #ifndef END_MEM
105 #define END_MEM                 (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
106 #endif
107 
108 /*
109  * The module can be at any place in ram in nommu mode.
110  */
111 #define MODULES_END             (END_MEM)
112 #define MODULES_VADDR           PAGE_OFFSET
113 
114 #define XIP_VIRT_ADDR(physaddr)  (physaddr)
115 
116 #endif /* !CONFIG_MMU */
117 
118 /*
119  * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
120  * locations
121  */
122 #ifdef CONFIG_HAVE_TCM
123 #define ITCM_OFFSET     UL(0xfffe0000)
124 #define DTCM_OFFSET     UL(0xfffe8000)
125 #endif
126 
127 /*
128  * Convert a physical address to a Page Frame Number and back
129  */
130 #define __phys_to_pfn(paddr)    ((unsigned long)((paddr) >> PAGE_SHIFT))
131 #define __pfn_to_phys(pfn)      ((phys_addr_t)(pfn) << PAGE_SHIFT)
132 
133 /*
134  * Convert a page to/from a physical address
135  */
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)))
138 
139 /*
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.
145  */
146 #ifdef CONFIG_ARM_LPAE
147 #define ARCH_PGD_SHIFT          L1_CACHE_SHIFT
148 #else
149 #define ARCH_PGD_SHIFT          0
150 #endif
151 #define ARCH_PGD_MASK           ((1 << ARCH_PGD_SHIFT) - 1)
152 
153 /*
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.
158  */
159 #ifndef PLAT_PHYS_OFFSET
160 #define PLAT_PHYS_OFFSET        UL(CONFIG_PHYS_OFFSET)
161 #endif
162 
163 #ifndef __ASSEMBLY__
164 
165 /*
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.
169  */
170 #ifndef __virt_to_phys
171 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT
172 
173 /*
174  * Constants used to force the right instruction encodings and shifts
175  * so that all we need to do is modify the 8-bit constant field.
176  */
177 #define __PV_BITS_31_24 0x81000000
178 #define __PV_BITS_7_0   0x81
179 
180 extern u64 __pv_phys_offset;
181 extern u64 __pv_offset;
182 extern void fixup_pv_table(const void *, unsigned long);
183 extern const void *__pv_table_begin, *__pv_table_end;
184 
185 #define PHYS_OFFSET __pv_phys_offset
186 
187 #define __pv_stub(from,to,instr,type)                   \
188         __asm__("@ __pv_stub\n"                         \
189         "1:     " instr "       %0, %1, %2\n"           \
190         "       .pushsection .pv_table,\"a\"\n"         \
191         "       .long   1b\n"                           \
192         "       .popsection\n"                          \
193         : "=r" (to)                                     \
194         : "r" (from), "I" (type))
195 
196 #define __pv_stub_mov_hi(t)                             \
197         __asm__ volatile("@ __pv_stub_mov\n"            \
198         "1:     mov     %R0, %1\n"                      \
199         "       .pushsection .pv_table,\"a\"\n"         \
200         "       .long   1b\n"                           \
201         "       .popsection\n"                          \
202         : "=r" (t)                                      \
203         : "I" (__PV_BITS_7_0))
204 
205 #define __pv_add_carry_stub(x, y)                       \
206         __asm__ volatile("@ __pv_add_carry_stub\n"      \
207         "1:     adds    %Q0, %1, %2\n"                  \
208         "       adc     %R0, %R0, #0\n"                 \
209         "       .pushsection .pv_table,\"a\"\n"         \
210         "       .long   1b\n"                           \
211         "       .popsection\n"                          \
212         : "+r" (y)                                      \
213         : "r" (x), "I" (__PV_BITS_31_24)                \
214         : "cc")
215 
216 static inline phys_addr_t __virt_to_phys(unsigned long x)
217 {
218         phys_addr_t t;
219 
220         if (sizeof(phys_addr_t) == 4) {
221                 __pv_stub(x, t, "add", __PV_BITS_31_24);
222         } else {
223                 __pv_stub_mov_hi(t);
224                 __pv_add_carry_stub(x, t);
225         }
226         return t;
227 }
228 
229 static inline unsigned long __phys_to_virt(phys_addr_t x)
230 {
231         unsigned long t;
232 
233         /*
234          * 'unsigned long' cast discard upper word when
235          * phys_addr_t is 64 bit, and makes sure that inline
236          * assembler expression receives 32 bit argument
237          * in place where 'r' 32 bit operand is expected.
238          */
239         __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
240         return t;
241 }
242 
243 #else
244 
245 #define PHYS_OFFSET     PLAT_PHYS_OFFSET
246 
247 static inline phys_addr_t __virt_to_phys(unsigned long x)
248 {
249         return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
250 }
251 
252 static inline unsigned long __phys_to_virt(phys_addr_t x)
253 {
254         return x - PHYS_OFFSET + PAGE_OFFSET;
255 }
256 
257 #endif
258 #endif
259 
260 /*
261  * PFNs are used to describe any physical page; this means
262  * PFN 0 == physical address 0.
263  *
264  * This is the PFN of the first RAM page in the kernel
265  * direct-mapped view.  We assume this is the first page
266  * of RAM in the mem_map as well.
267  */
268 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
269 
270 /*
271  * These are *only* valid on the kernel direct mapped RAM memory.
272  * Note: Drivers should NOT use these.  They are the wrong
273  * translation for translating DMA addresses.  Use the driver
274  * DMA support - see dma-mapping.h.
275  */
276 static inline phys_addr_t virt_to_phys(const volatile void *x)
277 {
278         return __virt_to_phys((unsigned long)(x));
279 }
280 
281 static inline void *phys_to_virt(phys_addr_t x)
282 {
283         return (void *)__phys_to_virt(x);
284 }
285 
286 /*
287  * Drivers should NOT use these either.
288  */
289 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
290 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
291 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
292 
293 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
294 
295 /*
296  * These are for systems that have a hardware interconnect supported alias of
297  * physical memory for idmap purposes.  Most cases should leave these
298  * untouched.
299  */
300 static inline phys_addr_t __virt_to_idmap(unsigned long x)
301 {
302         if (arch_virt_to_idmap)
303                 return arch_virt_to_idmap(x);
304         else
305                 return __virt_to_phys(x);
306 }
307 
308 #define virt_to_idmap(x)        __virt_to_idmap((unsigned long)(x))
309 
310 /*
311  * Virtual <-> DMA view memory address translations
312  * Again, these are *only* valid on the kernel direct mapped RAM
313  * memory.  Use of these is *deprecated* (and that doesn't mean
314  * use the __ prefixed forms instead.)  See dma-mapping.h.
315  */
316 #ifndef __virt_to_bus
317 #define __virt_to_bus   __virt_to_phys
318 #define __bus_to_virt   __phys_to_virt
319 #define __pfn_to_bus(x) __pfn_to_phys(x)
320 #define __bus_to_pfn(x) __phys_to_pfn(x)
321 #endif
322 
323 #ifdef CONFIG_VIRT_TO_BUS
324 static inline __deprecated unsigned long virt_to_bus(void *x)
325 {
326         return __virt_to_bus((unsigned long)x);
327 }
328 
329 static inline __deprecated void *bus_to_virt(unsigned long x)
330 {
331         return (void *)__bus_to_virt(x);
332 }
333 #endif
334 
335 /*
336  * Conversion between a struct page and a physical address.
337  *
338  *  page_to_pfn(page)   convert a struct page * to a PFN number
339  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
340  *
341  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
342  *  virt_addr_valid(k)  indicates whether a virtual address is valid
343  */
344 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
345 
346 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
347 #define virt_addr_valid(kaddr)  (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
348                                         && pfn_valid(__pa(kaddr) >> PAGE_SHIFT) )
349 
350 #endif
351 
352 #include <asm-generic/memory_model.h>
353 
354 #endif
355 

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