arch/arm/include/asm/memory.h

   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 #ifdef CONFIG_NEED_MACH_MEMORY_H
  22 #include <mach/memory.h>
  23 #endif
  24
  25 /*
  26  * Allow for constants defined here to be used from assembly code
  27  * by prepending the UL suffix only with actual C code compilation.
  28  */
  29 #define UL(x) _AC(x, UL)
  30
  31 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
  32 #define PAGE_OFFSET             UL(CONFIG_PAGE_OFFSET)
  33
  34 #ifdef CONFIG_MMU
  35
  36 /*
  37  * TASK_SIZE - the maximum size of a user space task.
  38  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  39  */
  40 #define TASK_SIZE               (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
  41 #define TASK_UNMAPPED_BASE      ALIGN(TASK_SIZE / 3, SZ_16M)
  42
  43 /*
  44  * The maximum size of a 26-bit user space task.
  45  */
  46 #define TASK_SIZE_26            (UL(1) << 26)
  47
  48 /*
  49  * The module space lives between the addresses given by TASK_SIZE
  50  * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  51  */
  52 #ifndef CONFIG_THUMB2_KERNEL
  53 #define MODULES_VADDR           (PAGE_OFFSET - SZ_16M)
  54 #else
  55 /* smaller range for Thumb-2 symbols relocation (2^24)*/
  56 #define MODULES_VADDR           (PAGE_OFFSET - SZ_8M)
  57 #endif
  58
  59 #if TASK_SIZE > MODULES_VADDR
  60 #error Top of user space clashes with start of module space
  61 #endif
  62
  63 /*
  64  * The highmem pkmap virtual space shares the end of the module area.
  65  */
  66 #ifdef CONFIG_HIGHMEM
  67 #define MODULES_END             (PAGE_OFFSET - PMD_SIZE)
  68 #else
  69 #define MODULES_END             (PAGE_OFFSET)
  70 #endif
  71
  72 /*
  73  * The XIP kernel gets mapped at the bottom of the module vm area.
  74  * Since we use sections to map it, this macro replaces the physical address
  75  * with its virtual address while keeping offset from the base section.
  76  */
  77 #define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
  78
  79 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
  80 /*
  81  * Allow 16MB-aligned ioremap pages
  82  */
  83 #define IOREMAP_MAX_ORDER       24
  84 #endif
  85
  86 #define VECTORS_BASE            UL(0xffff0000)
  87
  88 #else /* CONFIG_MMU */
  89
  90 #ifndef __ASSEMBLY__
  91 extern unsigned long vectors_base;
  92 #define VECTORS_BASE            vectors_base
  93 #endif
  94
  95 /*
  96  * The limitation of user task size can grow up to the end of free ram region.
  97  * It is difficult to define and perhaps will never meet the original meaning
  98  * of this define that was meant to.
  99  * Fortunately, there is no reference for this in noMMU mode, for now.
 100  */
 101 #define TASK_SIZE               UL(0xffffffff)
 102
 103 #ifndef TASK_UNMAPPED_BASE
 104 #define TASK_UNMAPPED_BASE      UL(0x00000000)
 105 #endif
 106
 107 #ifndef END_MEM
 108 #define END_MEM                 (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
 109 #endif
 110
 111 /*
 112  * The module can be at any place in ram in nommu mode.
 113  */
 114 #define MODULES_END             (END_MEM)
 115 #define MODULES_VADDR           PAGE_OFFSET
 116
 117 #define XIP_VIRT_ADDR(physaddr)  (physaddr)
 118
 119 #endif /* !CONFIG_MMU */
 120
 121 #ifdef CONFIG_XIP_KERNEL
 122 #define KERNEL_START            _sdata
 123 #else
 124 #define KERNEL_START            _stext
 125 #endif
 126 #define KERNEL_END              _end
 127
 128 /*
 129  * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
 130  * locations
 131  */
 132 #ifdef CONFIG_HAVE_TCM
 133 #define ITCM_OFFSET     UL(0xfffe0000)
 134 #define DTCM_OFFSET     UL(0xfffe8000)
 135 #endif
 136
 137 /*
 138  * Convert a page to/from a physical address
 139  */
 140 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
 141 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
 142
 143 /*
 144  * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
 145  * memory.  This is used for XIP and NoMMU kernels, and on platforms that don't
 146  * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
 147  * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
 148  */
 149 #define PLAT_PHYS_OFFSET        UL(CONFIG_PHYS_OFFSET)
 150
 151 #ifdef CONFIG_XIP_KERNEL
 152 /*
 153  * When referencing data in RAM from the XIP region in a relative manner
 154  * with the MMU off, we need the relative offset between the two physical
 155  * addresses.  The macro below achieves this, which is:
 156  *    __pa(v_data) - __xip_pa(v_text)
 157  */
 158 #define PHYS_RELATIVE(v_data, v_text) \
 159         (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
 160          ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
 161           CONFIG_XIP_PHYS_ADDR))
 162 #else
 163 #define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
 164 #endif
 165
 166 #ifndef __ASSEMBLY__
 167
 168 /*
 169  * Physical vs virtual RAM address space conversion.  These are
 170  * private definitions which should NOT be used outside memory.h
 171  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 172  *
 173  * PFNs are used to describe any physical page; this means
 174  * PFN 0 == physical address 0.
 175  */
 176
 177 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
 178
 179 /*
 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.
 182  */
 183 #define __PV_BITS_31_24 0x81000000
 184 #define __PV_BITS_7_0   0x81
 185
 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;
 190
 191 #define PHYS_OFFSET     ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
 192 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
 193
 194 #define __pv_stub(from,to,instr,type)                   \
 195         __asm__("@ __pv_stub\n"                         \
 196         "1:     " instr "       %0, %1, %2\n"           \
 197         "       .pushsection .pv_table,\"a\"\n"         \
 198         "       .long   1b\n"                           \
 199         "       .popsection\n"                          \
 200         : "=r" (to)                                     \
 201         : "r" (from), "I" (type))
 202
 203 #define __pv_stub_mov_hi(t)                             \
 204         __asm__ volatile("@ __pv_stub_mov\n"            \
 205         "1:     mov     %R0, %1\n"                      \
 206         "       .pushsection .pv_table,\"a\"\n"         \
 207         "       .long   1b\n"                           \
 208         "       .popsection\n"                          \
 209         : "=r" (t)                                      \
 210         : "I" (__PV_BITS_7_0))
 211
 212 #define __pv_add_carry_stub(x, y)                       \
 213         __asm__ volatile("@ __pv_add_carry_stub\n"      \
 214         "1:     adds    %Q0, %1, %2\n"                  \
 215         "       adc     %R0, %R0, #0\n"                 \
 216         "       .pushsection .pv_table,\"a\"\n"         \
 217         "       .long   1b\n"                           \
 218         "       .popsection\n"                          \
 219         : "+r" (y)                                      \
 220         : "r" (x), "I" (__PV_BITS_31_24)                \
 221         : "cc")
 222
 223 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
 224 {
 225         phys_addr_t t;
 226
 227         if (sizeof(phys_addr_t) == 4) {
 228                 __pv_stub(x, t, "add", __PV_BITS_31_24);
 229         } else {
 230                 __pv_stub_mov_hi(t);
 231                 __pv_add_carry_stub(x, t);
 232         }
 233         return t;
 234 }
 235
 236 static inline unsigned long __phys_to_virt(phys_addr_t x)
 237 {
 238         unsigned long t;
 239
 240         /*
 241          * 'unsigned long' cast discard upper word when
 242          * phys_addr_t is 64 bit, and makes sure that inline
 243          * assembler expression receives 32 bit argument
 244          * in place where 'r' 32 bit operand is expected.
 245          */
 246         __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
 247         return t;
 248 }
 249
 250 #else
 251
 252 #define PHYS_OFFSET     PLAT_PHYS_OFFSET
 253 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
 254
 255 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
 256 {
 257         return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
 258 }
 259
 260 static inline unsigned long __phys_to_virt(phys_addr_t x)
 261 {
 262         return x - PHYS_OFFSET + PAGE_OFFSET;
 263 }
 264
 265 #endif
 266
 267 #define virt_to_pfn(kaddr) \
 268         ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
 269          PHYS_PFN_OFFSET)
 270
 271 #define __pa_symbol_nodebug(x)  __virt_to_phys_nodebug((x))
 272
 273 #ifdef CONFIG_DEBUG_VIRTUAL
 274 extern phys_addr_t __virt_to_phys(unsigned long x);
 275 extern phys_addr_t __phys_addr_symbol(unsigned long x);
 276 #else
 277 #define __virt_to_phys(x)       __virt_to_phys_nodebug(x)
 278 #define __phys_addr_symbol(x)   __pa_symbol_nodebug(x)
 279 #endif
 280
 281 /*
 282  * These are *only* valid on the kernel direct mapped RAM memory.
 283  * Note: Drivers should NOT use these.  They are the wrong
 284  * translation for translating DMA addresses.  Use the driver
 285  * DMA support - see dma-mapping.h.
 286  */
 287 #define virt_to_phys virt_to_phys
 288 static inline phys_addr_t virt_to_phys(const volatile void *x)
 289 {
 290         return __virt_to_phys((unsigned long)(x));
 291 }
 292
 293 #define phys_to_virt phys_to_virt
 294 static inline void *phys_to_virt(phys_addr_t x)
 295 {
 296         return (void *)__phys_to_virt(x);
 297 }
 298
 299 /*
 300  * Drivers should NOT use these either.
 301  */
 302 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 303 #define __pa_symbol(x)          __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
 304 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
 305 #define pfn_to_kaddr(pfn)       __va((phys_addr_t)(pfn) << PAGE_SHIFT)
 306
 307 extern long long arch_phys_to_idmap_offset;
 308
 309 /*
 310  * These are for systems that have a hardware interconnect supported alias
 311  * of physical memory for idmap purposes.  Most cases should leave these
 312  * untouched.  Note: this can only return addresses less than 4GiB.
 313  */
 314 static inline bool arm_has_idmap_alias(void)
 315 {
 316         return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
 317 }
 318
 319 #define IDMAP_INVALID_ADDR ((u32)~0)
 320
 321 static inline unsigned long phys_to_idmap(phys_addr_t addr)
 322 {
 323         if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
 324                 addr += arch_phys_to_idmap_offset;
 325                 if (addr > (u32)~0)
 326                         addr = IDMAP_INVALID_ADDR;
 327         }
 328         return addr;
 329 }
 330
 331 static inline phys_addr_t idmap_to_phys(unsigned long idmap)
 332 {
 333         phys_addr_t addr = idmap;
 334
 335         if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
 336                 addr -= arch_phys_to_idmap_offset;
 337
 338         return addr;
 339 }
 340
 341 static inline unsigned long __virt_to_idmap(unsigned long x)
 342 {
 343         return phys_to_idmap(__virt_to_phys(x));
 344 }
 345
 346 #define virt_to_idmap(x)        __virt_to_idmap((unsigned long)(x))
 347
 348 /*
 349  * Virtual <-> DMA view memory address translations
 350  * Again, these are *only* valid on the kernel direct mapped RAM
 351  * memory.  Use of these is *deprecated* (and that doesn't mean
 352  * use the __ prefixed forms instead.)  See dma-mapping.h.
 353  */
 354 #ifndef __virt_to_bus
 355 #define __virt_to_bus   __virt_to_phys
 356 #define __bus_to_virt   __phys_to_virt
 357 #define __pfn_to_bus(x) __pfn_to_phys(x)
 358 #define __bus_to_pfn(x) __phys_to_pfn(x)
 359 #endif
 360
 361 /*
 362  * Conversion between a struct page and a physical address.
 363  *
 364  *  page_to_pfn(page)   convert a struct page * to a PFN number
 365  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 366  *
 367  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 368  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 369  */
 370 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 371
 372 #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
 373 #define virt_addr_valid(kaddr)  (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
 374                                         && pfn_valid(virt_to_pfn(kaddr)))
 375
 376 #endif
 377
 378 #include <asm-generic/memory_model.h>
 379
 380 #endif