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 setup_vectors_base(void);
  92 extern unsigned long vectors_base;
  93 #define VECTORS_BASE            vectors_base
  94 #endif
  95
  96 /*
  97  * The limitation of user task size can grow up to the end of free ram region.
  98  * It is difficult to define and perhaps will never meet the original meaning
  99  * of this define that was meant to.
 100  * Fortunately, there is no reference for this in noMMU mode, for now.
 101  */
 102 #define TASK_SIZE               UL(0xffffffff)
 103
 104 #ifndef TASK_UNMAPPED_BASE
 105 #define TASK_UNMAPPED_BASE      UL(0x00000000)
 106 #endif
 107
 108 #ifndef END_MEM
 109 #define END_MEM                 (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
 110 #endif
 111
 112 /*
 113  * The module can be at any place in ram in nommu mode.
 114  */
 115 #define MODULES_END             (END_MEM)
 116 #define MODULES_VADDR           PAGE_OFFSET
 117
 118 #define XIP_VIRT_ADDR(physaddr)  (physaddr)
 119
 120 #endif /* !CONFIG_MMU */
 121
 122 #ifdef CONFIG_XIP_KERNEL
 123 #define KERNEL_START            _sdata
 124 #else
 125 #define KERNEL_START            _stext
 126 #endif
 127 #define KERNEL_END              _end
 128
 129 /*
 130  * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
 131  * locations
 132  */
 133 #ifdef CONFIG_HAVE_TCM
 134 #define ITCM_OFFSET     UL(0xfffe0000)
 135 #define DTCM_OFFSET     UL(0xfffe8000)
 136 #endif
 137
 138 /*
 139  * Convert a page to/from a physical address
 140  */
 141 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
 142 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
 143
 144 /*
 145  * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
 146  * memory.  This is used for XIP and NoMMU kernels, and on platforms that don't
 147  * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
 148  * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
 149  */
 150 #define PLAT_PHYS_OFFSET        UL(CONFIG_PHYS_OFFSET)
 151
 152 #ifdef CONFIG_XIP_KERNEL
 153 /*
 154  * When referencing data in RAM from the XIP region in a relative manner
 155  * with the MMU off, we need the relative offset between the two physical
 156  * addresses.  The macro below achieves this, which is:
 157  *    __pa(v_data) - __xip_pa(v_text)
 158  */
 159 #define PHYS_RELATIVE(v_data, v_text) \
 160         (((v_data) - PAGE_OFFSET + PLAT_PHYS_OFFSET) - \
 161          ((v_text) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR) + \
 162           CONFIG_XIP_PHYS_ADDR))
 163 #else
 164 #define PHYS_RELATIVE(v_data, v_text) ((v_data) - (v_text))
 165 #endif
 166
 167 #ifndef __ASSEMBLY__
 168
 169 /*
 170  * Physical vs virtual RAM address space conversion.  These are
 171  * private definitions which should NOT be used outside memory.h
 172  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 173  *
 174  * PFNs are used to describe any physical page; this means
 175  * PFN 0 == physical address 0.
 176  */
 177
 178 #if defined(CONFIG_ARM_PATCH_PHYS_VIRT)
 179
 180 /*
 181  * Constants used to force the right instruction encodings and shifts
 182  * so that all we need to do is modify the 8-bit constant field.
 183  */
 184 #define __PV_BITS_31_24 0x81000000
 185 #define __PV_BITS_7_0   0x81
 186
 187 extern unsigned long __pv_phys_pfn_offset;
 188 extern u64 __pv_offset;
 189 extern void fixup_pv_table(const void *, unsigned long);
 190 extern const void *__pv_table_begin, *__pv_table_end;
 191
 192 #define PHYS_OFFSET     ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
 193 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
 194
 195 #define __pv_stub(from,to,instr,type)                   \
 196         __asm__("@ __pv_stub\n"                         \
 197         "1:     " instr "       %0, %1, %2\n"           \
 198         "       .pushsection .pv_table,\"a\"\n"         \
 199         "       .long   1b\n"                           \
 200         "       .popsection\n"                          \
 201         : "=r" (to)                                     \
 202         : "r" (from), "I" (type))
 203
 204 #define __pv_stub_mov_hi(t)                             \
 205         __asm__ volatile("@ __pv_stub_mov\n"            \
 206         "1:     mov     %R0, %1\n"                      \
 207         "       .pushsection .pv_table,\"a\"\n"         \
 208         "       .long   1b\n"                           \
 209         "       .popsection\n"                          \
 210         : "=r" (t)                                      \
 211         : "I" (__PV_BITS_7_0))
 212
 213 #define __pv_add_carry_stub(x, y)                       \
 214         __asm__ volatile("@ __pv_add_carry_stub\n"      \
 215         "1:     adds    %Q0, %1, %2\n"                  \
 216         "       adc     %R0, %R0, #0\n"                 \
 217         "       .pushsection .pv_table,\"a\"\n"         \
 218         "       .long   1b\n"                           \
 219         "       .popsection\n"                          \
 220         : "+r" (y)                                      \
 221         : "r" (x), "I" (__PV_BITS_31_24)                \
 222         : "cc")
 223
 224 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
 225 {
 226         phys_addr_t t;
 227
 228         if (sizeof(phys_addr_t) == 4) {
 229                 __pv_stub(x, t, "add", __PV_BITS_31_24);
 230         } else {
 231                 __pv_stub_mov_hi(t);
 232                 __pv_add_carry_stub(x, t);
 233         }
 234         return t;
 235 }
 236
 237 static inline unsigned long __phys_to_virt(phys_addr_t x)
 238 {
 239         unsigned long t;
 240
 241         /*
 242          * 'unsigned long' cast discard upper word when
 243          * phys_addr_t is 64 bit, and makes sure that inline
 244          * assembler expression receives 32 bit argument
 245          * in place where 'r' 32 bit operand is expected.
 246          */
 247         __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
 248         return t;
 249 }
 250
 251 #else
 252
 253 #define PHYS_OFFSET     PLAT_PHYS_OFFSET
 254 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
 255
 256 static inline phys_addr_t __virt_to_phys_nodebug(unsigned long x)
 257 {
 258         return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
 259 }
 260
 261 static inline unsigned long __phys_to_virt(phys_addr_t x)
 262 {
 263         return x - PHYS_OFFSET + PAGE_OFFSET;
 264 }
 265
 266 #endif
 267
 268 #define virt_to_pfn(kaddr) \
 269         ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
 270          PHYS_PFN_OFFSET)
 271
 272 #define __pa_symbol_nodebug(x)  __virt_to_phys_nodebug((x))
 273
 274 #ifdef CONFIG_DEBUG_VIRTUAL
 275 extern phys_addr_t __virt_to_phys(unsigned long x);
 276 extern phys_addr_t __phys_addr_symbol(unsigned long x);
 277 #else
 278 #define __virt_to_phys(x)       __virt_to_phys_nodebug(x)
 279 #define __phys_addr_symbol(x)   __pa_symbol_nodebug(x)
 280 #endif
 281
 282 /*
 283  * These are *only* valid on the kernel direct mapped RAM memory.
 284  * Note: Drivers should NOT use these.  They are the wrong
 285  * translation for translating DMA addresses.  Use the driver
 286  * DMA support - see dma-mapping.h.
 287  */
 288 #define virt_to_phys virt_to_phys
 289 static inline phys_addr_t virt_to_phys(const volatile void *x)
 290 {
 291         return __virt_to_phys((unsigned long)(x));
 292 }
 293
 294 #define phys_to_virt phys_to_virt
 295 static inline void *phys_to_virt(phys_addr_t x)
 296 {
 297         return (void *)__phys_to_virt(x);
 298 }
 299
 300 /*
 301  * Drivers should NOT use these either.
 302  */
 303 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 304 #define __pa_symbol(x)          __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
 305 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
 306 #define pfn_to_kaddr(pfn)       __va((phys_addr_t)(pfn) << PAGE_SHIFT)
 307
 308 extern long long arch_phys_to_idmap_offset;
 309
 310 /*
 311  * These are for systems that have a hardware interconnect supported alias
 312  * of physical memory for idmap purposes.  Most cases should leave these
 313  * untouched.  Note: this can only return addresses less than 4GiB.
 314  */
 315 static inline bool arm_has_idmap_alias(void)
 316 {
 317         return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0;
 318 }
 319
 320 #define IDMAP_INVALID_ADDR ((u32)~0)
 321
 322 static inline unsigned long phys_to_idmap(phys_addr_t addr)
 323 {
 324         if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset) {
 325                 addr += arch_phys_to_idmap_offset;
 326                 if (addr > (u32)~0)
 327                         addr = IDMAP_INVALID_ADDR;
 328         }
 329         return addr;
 330 }
 331
 332 static inline phys_addr_t idmap_to_phys(unsigned long idmap)
 333 {
 334         phys_addr_t addr = idmap;
 335
 336         if (IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset)
 337                 addr -= arch_phys_to_idmap_offset;
 338
 339         return addr;
 340 }
 341
 342 static inline unsigned long __virt_to_idmap(unsigned long x)
 343 {
 344         return phys_to_idmap(__virt_to_phys(x));
 345 }
 346
 347 #define virt_to_idmap(x)        __virt_to_idmap((unsigned long)(x))
 348
 349 /*
 350  * Virtual <-> DMA view memory address translations
 351  * Again, these are *only* valid on the kernel direct mapped RAM
 352  * memory.  Use of these is *deprecated* (and that doesn't mean
 353  * use the __ prefixed forms instead.)  See dma-mapping.h.
 354  */
 355 #ifndef __virt_to_bus
 356 #define __virt_to_bus   __virt_to_phys
 357 #define __bus_to_virt   __phys_to_virt
 358 #define __pfn_to_bus(x) __pfn_to_phys(x)
 359 #define __bus_to_pfn(x) __phys_to_pfn(x)
 360 #endif
 361
 362 /*
 363  * Conversion between a struct page and a physical address.
 364  *
 365  *  page_to_pfn(page)   convert a struct page * to a PFN number
 366  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
 367  *
 368  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 369  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 370  */
 371 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 372
 373 #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
 374 #define virt_addr_valid(kaddr)  (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
 375                                         && pfn_valid(virt_to_pfn(kaddr)))
 376
 377 #endif
 378
 379 #include <asm-generic/memory_model.h>
 380
 381 #endif