arch/cris/include/arch-v32/arch/mmu.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_CRIS_ARCH_MMU_H
   3 #define _ASM_CRIS_ARCH_MMU_H
   4
   5 /* MMU context type. */
   6 typedef struct
   7 {
   8   unsigned int page_id;
   9 } mm_context_t;
  10
  11 /* Kernel memory segments. */
  12 #define KSEG_F 0xf0000000UL
  13 #define KSEG_E 0xe0000000UL
  14 #define KSEG_D 0xd0000000UL
  15 #define KSEG_C 0xc0000000UL
  16 #define KSEG_B 0xb0000000UL
  17 #define KSEG_A 0xa0000000UL
  18 #define KSEG_9 0x90000000UL
  19 #define KSEG_8 0x80000000UL
  20 #define KSEG_7 0x70000000UL
  21 #define KSEG_6 0x60000000UL
  22 #define KSEG_5 0x50000000UL
  23 #define KSEG_4 0x40000000UL
  24 #define KSEG_3 0x30000000UL
  25 #define KSEG_2 0x20000000UL
  26 #define KSEG_1 0x10000000UL
  27 #define KSEG_0 0x00000000UL
  28
  29 /*
  30  * CRISv32 PTE bits:
  31  *
  32  *  Bit:   31     30-13  12-5     4        3       2        1        0
  33  *       +-------+-----+------+--------+-------+--------+-------+---------+
  34  *       | cache | pfn | zero | global | valid | kernel | write | execute |
  35  *       +-------+-----+------+--------+-------+--------+-------+---------+
  36  */
  37
  38 /*
  39  * Defines for accessing the bits. Also define some synonyms for use with
  40  * the software-based defined bits below.
  41  */
  42 #define _PAGE_EXECUTE       (1 << 0)    /* Execution bit. */
  43 #define _PAGE_WE            (1 << 1)    /* Write bit. */
  44 #define _PAGE_SILENT_WRITE  (1 << 1)    /* Same as above. */
  45 #define _PAGE_KERNEL        (1 << 2)    /* Kernel mode page. */
  46 #define _PAGE_VALID         (1 << 3)    /* Page is valid. */
  47 #define _PAGE_SILENT_READ   (1 << 3)    /* Same as above. */
  48 #define _PAGE_GLOBAL        (1 << 4)    /* Global page. */
  49 #define _PAGE_NO_CACHE      (1 << 31)   /* part of the uncached memory map */
  50
  51
  52 /*
  53  * The hardware doesn't care about these bits, but the kernel uses them in
  54  * software.
  55  */
  56 #define _PAGE_PRESENT   (1 << 5)   /* Page is present in memory. */
  57 #define _PAGE_ACCESSED  (1 << 6)   /* Simulated in software using valid bit. */
  58 #define _PAGE_MODIFIED  (1 << 7)   /* Simulated in software using we bit. */
  59 #define _PAGE_READ      (1 << 8)   /* Read enabled. */
  60 #define _PAGE_WRITE     (1 << 9)   /* Write enabled. */
  61
  62 /* Define some higher level generic page attributes. */
  63 #define __READABLE      (_PAGE_READ | _PAGE_SILENT_READ | _PAGE_ACCESSED)
  64 #define __WRITEABLE     (_PAGE_WRITE | _PAGE_SILENT_WRITE | _PAGE_MODIFIED)
  65
  66 #define _PAGE_TABLE     (_PAGE_PRESENT | __READABLE | __WRITEABLE)
  67 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED)
  68
  69 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
  70 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
  71                                  _PAGE_ACCESSED)
  72 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_WRITE | \
  73                                   _PAGE_ACCESSED | _PAGE_EXECUTE)
  74
  75 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | __READABLE)
  76 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE | _PAGE_ACCESSED)
  77
  78 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | __READABLE)
  79 #define PAGE_COPY_EXEC  __pgprot(_PAGE_PRESENT | __READABLE | _PAGE_EXECUTE)
  80 #define PAGE_KERNEL     __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | \
  81                                  _PAGE_PRESENT | __READABLE | __WRITEABLE)
  82 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_GLOBAL | _PAGE_KERNEL | _PAGE_EXECUTE | \
  83                                  _PAGE_PRESENT | __READABLE | __WRITEABLE)
  84 #define PAGE_SIGNAL_TRAMPOLINE __pgprot(_PAGE_GLOBAL | _PAGE_EXECUTE | \
  85                                        _PAGE_PRESENT | __READABLE)
  86
  87 #define _KERNPG_TABLE   (_PAGE_TABLE | _PAGE_KERNEL)
  88
  89 /* CRISv32 can do page protection for execute.
  90  * Write permissions imply read permissions.
  91  * Note that the numbers are in Execute-Write-Read order!
  92  */
  93 #define __P000  PAGE_NONE
  94 #define __P001  PAGE_READONLY
  95 #define __P010  PAGE_COPY
  96 #define __P011  PAGE_COPY
  97 #define __P100  PAGE_READONLY_EXEC
  98 #define __P101  PAGE_READONLY_EXEC
  99 #define __P110  PAGE_COPY_EXEC
 100 #define __P111  PAGE_COPY_EXEC
 101
 102 #define __S000  PAGE_NONE
 103 #define __S001  PAGE_READONLY
 104 #define __S010  PAGE_SHARED
 105 #define __S011  PAGE_SHARED
 106 #define __S100  PAGE_READONLY_EXEC
 107 #define __S101  PAGE_READONLY_EXEC
 108 #define __S110  PAGE_SHARED_EXEC
 109 #define __S111  PAGE_SHARED_EXEC
 110
 111 #endif /* _ASM_CRIS_ARCH_MMU_H */