include/asm-xtensa/fixmap.h

   1 /*
   2  * include/asm-xtensa/fixmap.h
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 2001 - 2005 Tensilica Inc.
   9  */
  10
  11 #ifndef _XTENSA_FIXMAP_H
  12 #define _XTENSA_FIXMAP_H
  13
  14 #include <asm/processor.h>
  15
  16 #ifdef CONFIG_MMU
  17
  18 /*
  19  * Here we define all the compile-time virtual addresses.
  20  */
  21
  22 #if XCHAL_SEG_MAPPABLE_VADDR != 0
  23 # error "Current port requires virtual user space starting at 0"
  24 #endif
  25 #if XCHAL_SEG_MAPPABLE_SIZE < 0x80000000
  26 # error "Current port requires at least 0x8000000 bytes for user space"
  27 #endif
  28
  29 /* Verify instruction/data ram/rom and xlmi don't overlay vmalloc space. */
  30
  31 #define __IN_VMALLOC(addr)                                              \
  32         (((addr) >= VMALLOC_START) && ((addr) < VMALLOC_END))
  33 #define __SPAN_VMALLOC(start,end)                                       \
  34         (((start) < VMALLOC_START) && ((end) >= VMALLOC_END))
  35 #define INSIDE_VMALLOC(start,end)                                       \
  36         (__IN_VMALLOC((start)) || __IN_VMALLOC(end) || __SPAN_VMALLOC((start),(end)))
  37
  38 #if XCHAL_NUM_INSTROM
  39 # if XCHAL_NUM_INSTROM == 1
  40 #  if INSIDE_VMALLOC(XCHAL_INSTROM0_VADDR,XCHAL_INSTROM0_VADDR+XCHAL_INSTROM0_SIZE)
  41 #   error vmalloc range conflicts with instrom0
  42 #  endif
  43 # endif
  44 # if XCHAL_NUM_INSTROM == 2
  45 #  if INSIDE_VMALLOC(XCHAL_INSTROM1_VADDR,XCHAL_INSTROM1_VADDR+XCHAL_INSTROM1_SIZE)
  46 #   error vmalloc range conflicts with instrom1
  47 #  endif
  48 # endif
  49 #endif
  50
  51 #if XCHAL_NUM_INSTRAM
  52 # if XCHAL_NUM_INSTRAM == 1
  53 #  if INSIDE_VMALLOC(XCHAL_INSTRAM0_VADDR,XCHAL_INSTRAM0_VADDR+XCHAL_INSTRAM0_SIZE)
  54 #   error vmalloc range conflicts with instram0
  55 #  endif
  56 # endif
  57 # if XCHAL_NUM_INSTRAM == 2
  58 #  if INSIDE_VMALLOC(XCHAL_INSTRAM1_VADDR,XCHAL_INSTRAM1_VADDR+XCHAL_INSTRAM1_SIZE)
  59 #   error vmalloc range conflicts with instram1
  60 #  endif
  61 # endif
  62 #endif
  63
  64 #if XCHAL_NUM_DATAROM
  65 # if XCHAL_NUM_DATAROM == 1
  66 #  if INSIDE_VMALLOC(XCHAL_DATAROM0_VADDR,XCHAL_DATAROM0_VADDR+XCHAL_DATAROM0_SIZE)
  67 #   error vmalloc range conflicts with datarom0
  68 #  endif
  69 # endif
  70 # if XCHAL_NUM_DATAROM == 2
  71 #  if INSIDE_VMALLOC(XCHAL_DATAROM1_VADDR,XCHAL_DATAROM1_VADDR+XCHAL_DATAROM1_SIZE)
  72 #   error vmalloc range conflicts with datarom1
  73 #  endif
  74 # endif
  75 #endif
  76
  77 #if XCHAL_NUM_DATARAM
  78 # if XCHAL_NUM_DATARAM == 1
  79 #  if INSIDE_VMALLOC(XCHAL_DATARAM0_VADDR,XCHAL_DATARAM0_VADDR+XCHAL_DATARAM0_SIZE)
  80 #   error vmalloc range conflicts with dataram0
  81 #  endif
  82 # endif
  83 # if XCHAL_NUM_DATARAM == 2
  84 #  if INSIDE_VMALLOC(XCHAL_DATARAM1_VADDR,XCHAL_DATARAM1_VADDR+XCHAL_DATARAM1_SIZE)
  85 #   error vmalloc range conflicts with dataram1
  86 #  endif
  87 # endif
  88 #endif
  89
  90 #if XCHAL_NUM_XLMI
  91 # if XCHAL_NUM_XLMI == 1
  92 #  if INSIDE_VMALLOC(XCHAL_XLMI0_VADDR,XCHAL_XLMI0_VADDR+XCHAL_XLMI0_SIZE)
  93 #   error vmalloc range conflicts with xlmi0
  94 #  endif
  95 # endif
  96 # if XCHAL_NUM_XLMI == 2
  97 #  if INSIDE_VMALLOC(XCHAL_XLMI1_VADDR,XCHAL_XLMI1_VADDR+XCHAL_XLMI1_SIZE)
  98 #   error vmalloc range conflicts with xlmi1
  99 #  endif
 100 # endif
 101 #endif
 102
 103 #if (XCHAL_NUM_INSTROM > 2) || \
 104     (XCHAL_NUM_INSTRAM > 2) || \
 105     (XCHAL_NUM_DATARAM > 2) || \
 106     (XCHAL_NUM_DATAROM > 2) || \
 107     (XCHAL_NUM_XLMI    > 2)
 108 # error Insufficient checks on vmalloc above for more than 2 devices
 109 #endif
 110
 111 /*
 112  * USER_VM_SIZE does not necessarily equal TASK_SIZE.  We bumped
 113  * TASK_SIZE down to 0x4000000 to simplify the handling of windowed
 114  * call instructions (currently limited to a range of 1 GByte).  User
 115  * tasks may very well reclaim the VM space from 0x40000000 to
 116  * 0x7fffffff in the future, so we do not want the kernel becoming
 117  * accustomed to having any of its stuff (e.g., page tables) in this
 118  * region.  This VM region is no-man's land for now.
 119  */
 120
 121 #define USER_VM_START           XCHAL_SEG_MAPPABLE_VADDR
 122 #define USER_VM_SIZE            0x80000000
 123
 124 /*  Size of page table:  */
 125
 126 #define PGTABLE_SIZE_BITS       (32 - XCHAL_MMU_MIN_PTE_PAGE_SIZE + 2)
 127 #define PGTABLE_SIZE            (1L << PGTABLE_SIZE_BITS)
 128
 129 /*  All kernel-mappable space:  */
 130
 131 #define KERNEL_ALLMAP_START     (USER_VM_START + USER_VM_SIZE)
 132 #define KERNEL_ALLMAP_SIZE      (XCHAL_SEG_MAPPABLE_SIZE - KERNEL_ALLMAP_START)
 133
 134 /*  Carve out page table at start of kernel-mappable area:  */
 135
 136 #if KERNEL_ALLMAP_SIZE < PGTABLE_SIZE
 137 #error "Gimme some space for page table!"
 138 #endif
 139 #define PGTABLE_START           KERNEL_ALLMAP_START
 140
 141 /*  Remaining kernel-mappable space:  */
 142
 143 #define KERNEL_MAPPED_START     (KERNEL_ALLMAP_START + PGTABLE_SIZE)
 144 #define KERNEL_MAPPED_SIZE      (KERNEL_ALLMAP_SIZE - PGTABLE_SIZE)
 145
 146 #if KERNEL_MAPPED_SIZE < 0x01000000     /* 16 MB is arbitrary for now */
 147 # error "Shouldn't the kernel have at least *some* mappable space?"
 148 #endif
 149
 150 #define MAX_LOW_MEMORY          XCHAL_KSEG_CACHED_SIZE
 151
 152 #endif
 153
 154 /*
 155  *  Some constants used elsewhere, but perhaps only in Xtensa header
 156  *  files, so maybe we can get rid of some and access compile-time HAL
 157  *  directly...
 158  *
 159  *  Note:  We assume that system RAM is located at the very start of the
 160  *         kernel segments !!
 161  */
 162 #define KERNEL_VM_LOW           XCHAL_KSEG_CACHED_VADDR
 163 #define KERNEL_VM_HIGH          XCHAL_KSEG_BYPASS_VADDR
 164 #define KERNEL_SPACE            XCHAL_KSEG_CACHED_VADDR
 165
 166 /*
 167  * Returns the physical/virtual addresses of the kernel space
 168  * (works with the cached kernel segment only, which is the
 169  *  one normally used for kernel operation).
 170  */
 171
 172 /*                      PHYSICAL        BYPASS          CACHED
 173  *
 174  *  bypass vaddr        bypass paddr    *               cached vaddr
 175  *  cached vaddr        cached paddr    bypass vaddr    *
 176  *  bypass paddr        *               bypass vaddr    cached vaddr
 177  *  cached paddr        *               bypass vaddr    cached vaddr
 178  *  other               *               *               *
 179  */
 180
 181 #define PHYSADDR(a)                                                           \
 182 (((unsigned)(a) >= XCHAL_KSEG_BYPASS_VADDR                                    \
 183   && (unsigned)(a) < XCHAL_KSEG_BYPASS_VADDR + XCHAL_KSEG_BYPASS_SIZE) ?      \
 184     (unsigned)(a) - XCHAL_KSEG_BYPASS_VADDR + XCHAL_KSEG_BYPASS_PADDR :       \
 185     ((unsigned)(a) >= XCHAL_KSEG_CACHED_VADDR                                 \
 186      && (unsigned)(a) < XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_CACHED_SIZE) ?   \
 187         (unsigned)(a) - XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_CACHED_PADDR :   \
 188         (unsigned)(a))
 189
 190 #define BYPASS_ADDR(a)                                                        \
 191 (((unsigned)(a) >= XCHAL_KSEG_BYPASS_PADDR                                    \
 192   && (unsigned)(a) < XCHAL_KSEG_BYPASS_PADDR + XCHAL_KSEG_BYPASS_SIZE) ?      \
 193     (unsigned)(a) - XCHAL_KSEG_BYPASS_PADDR + XCHAL_KSEG_BYPASS_VADDR :       \
 194     ((unsigned)(a) >= XCHAL_KSEG_CACHED_PADDR                                 \
 195      && (unsigned)(a) < XCHAL_KSEG_CACHED_PADDR + XCHAL_KSEG_CACHED_SIZE) ?   \
 196         (unsigned)(a) - XCHAL_KSEG_CACHED_PADDR + XCHAL_KSEG_BYPASS_VADDR :   \
 197         ((unsigned)(a) >= XCHAL_KSEG_CACHED_VADDR                             \
 198          && (unsigned)(a) < XCHAL_KSEG_CACHED_VADDR+XCHAL_KSEG_CACHED_SIZE)?  \
 199             (unsigned)(a) - XCHAL_KSEG_CACHED_VADDR+XCHAL_KSEG_BYPASS_VADDR:  \
 200             (unsigned)(a))
 201
 202 #define CACHED_ADDR(a)                                                        \
 203 (((unsigned)(a) >= XCHAL_KSEG_BYPASS_PADDR                                    \
 204   && (unsigned)(a) < XCHAL_KSEG_BYPASS_PADDR + XCHAL_KSEG_BYPASS_SIZE) ?      \
 205     (unsigned)(a) - XCHAL_KSEG_BYPASS_PADDR + XCHAL_KSEG_CACHED_VADDR :       \
 206     ((unsigned)(a) >= XCHAL_KSEG_CACHED_PADDR                                 \
 207      && (unsigned)(a) < XCHAL_KSEG_CACHED_PADDR + XCHAL_KSEG_CACHED_SIZE) ?   \
 208         (unsigned)(a) - XCHAL_KSEG_CACHED_PADDR + XCHAL_KSEG_CACHED_VADDR :   \
 209         ((unsigned)(a) >= XCHAL_KSEG_BYPASS_VADDR                             \
 210          && (unsigned)(a) < XCHAL_KSEG_BYPASS_VADDR+XCHAL_KSEG_BYPASS_SIZE) ? \
 211             (unsigned)(a) - XCHAL_KSEG_BYPASS_VADDR+XCHAL_KSEG_CACHED_VADDR : \
 212             (unsigned)(a))
 213
 214 #define PHYSADDR_IO(a)                                                        \
 215 (((unsigned)(a) >= XCHAL_KIO_BYPASS_VADDR                                     \
 216   && (unsigned)(a) < XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_BYPASS_SIZE) ?        \
 217     (unsigned)(a) - XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_BYPASS_PADDR :         \
 218     ((unsigned)(a) >= XCHAL_KIO_CACHED_VADDR                                  \
 219      && (unsigned)(a) < XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_CACHED_SIZE) ?     \
 220         (unsigned)(a) - XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_CACHED_PADDR :     \
 221         (unsigned)(a))
 222
 223 #define BYPASS_ADDR_IO(a)                                                     \
 224 (((unsigned)(a) >= XCHAL_KIO_BYPASS_PADDR                                     \
 225   && (unsigned)(a) < XCHAL_KIO_BYPASS_PADDR + XCHAL_KIO_BYPASS_SIZE) ?        \
 226     (unsigned)(a) - XCHAL_KIO_BYPASS_PADDR + XCHAL_KIO_BYPASS_VADDR :         \
 227     ((unsigned)(a) >= XCHAL_KIO_CACHED_PADDR                                  \
 228      && (unsigned)(a) < XCHAL_KIO_CACHED_PADDR + XCHAL_KIO_CACHED_SIZE) ?     \
 229         (unsigned)(a) - XCHAL_KIO_CACHED_PADDR + XCHAL_KIO_BYPASS_VADDR :     \
 230         ((unsigned)(a) >= XCHAL_KIO_CACHED_VADDR                              \
 231          && (unsigned)(a) < XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_CACHED_SIZE) ? \
 232             (unsigned)(a) - XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_BYPASS_VADDR : \
 233             (unsigned)(a))
 234
 235 #define CACHED_ADDR_IO(a)                                                     \
 236 (((unsigned)(a) >= XCHAL_KIO_BYPASS_PADDR                                     \
 237   && (unsigned)(a) < XCHAL_KIO_BYPASS_PADDR + XCHAL_KIO_BYPASS_SIZE) ?        \
 238     (unsigned)(a) - XCHAL_KIO_BYPASS_PADDR + XCHAL_KIO_CACHED_VADDR :         \
 239     ((unsigned)(a) >= XCHAL_KIO_CACHED_PADDR                                  \
 240      && (unsigned)(a) < XCHAL_KIO_CACHED_PADDR + XCHAL_KIO_CACHED_SIZE) ?     \
 241         (unsigned)(a) - XCHAL_KIO_CACHED_PADDR + XCHAL_KIO_CACHED_VADDR :     \
 242         ((unsigned)(a) >= XCHAL_KIO_BYPASS_VADDR                              \
 243          && (unsigned)(a) < XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_BYPASS_SIZE) ? \
 244             (unsigned)(a) - XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_CACHED_VADDR : \
 245             (unsigned)(a))
 246
 247 #endif /* _XTENSA_ADDRSPACE_H */
 248
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