arch/csky/abiv2/inc/abi/pgtable-bits.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef __ASM_CSKY_PGTABLE_BITS_H
   4 #define __ASM_CSKY_PGTABLE_BITS_H
   5
   6 /* implemented in software */
   7 #define _PAGE_ACCESSED          (1<<7)
   8 #define _PAGE_READ              (1<<8)
   9 #define _PAGE_WRITE             (1<<9)
  10 #define _PAGE_PRESENT           (1<<10)
  11 #define _PAGE_MODIFIED          (1<<11)
  12
  13 /* We borrow bit 7 to store the exclusive marker in swap PTEs. */
  14 #define _PAGE_SWP_EXCLUSIVE     (1<<7)
  15
  16 /* implemented in hardware */
  17 #define _PAGE_GLOBAL            (1<<0)
  18 #define _PAGE_VALID             (1<<1)
  19 #define _PAGE_DIRTY             (1<<2)
  20
  21 #define _PAGE_SO                (1<<5)
  22 #define _PAGE_BUF               (1<<6)
  23 #define _PAGE_CACHE             (1<<3)
  24 #define _CACHE_MASK             _PAGE_CACHE
  25
  26 #define _CACHE_CACHED           (_PAGE_CACHE | _PAGE_BUF)
  27 #define _CACHE_UNCACHED         (0)
  28
  29 #define _PAGE_PROT_NONE         _PAGE_WRITE
  30
  31 /*
  32  * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
  33  * are !pte_none() && !pte_present().
  34  *
  35  * Format of swap PTE:
  36  *     bit          0:    _PAGE_GLOBAL (zero)
  37  *     bit          1:    _PAGE_VALID (zero)
  38  *     bit      2 - 6:    swap type
  39  *     bit          7:    exclusive marker
  40  *     bit          8:    swap offset[0]
  41  *     bit          9:    _PAGE_WRITE (zero)
  42  *     bit         10:    _PAGE_PRESENT (zero)
  43  *     bit    11 - 31:    swap offset[1 - 21]
  44  */
  45 #define __swp_type(x)                   (((x).val >> 2) & 0x1f)
  46 #define __swp_offset(x)                 ((((x).val >> 8) & 0x1) | \
  47                                         (((x).val >> 10) & 0x3ffffe))
  48 #define __swp_entry(type, offset)       ((swp_entry_t) { \
  49                                         ((type & 0x1f) << 2) | \
  50                                         ((offset & 0x1) << 8) | \
  51                                         ((offset & 0x3ffffe) << 10)})
  52
  53 #endif /* __ASM_CSKY_PGTABLE_BITS_H */