arch/riscv/include/asm/pgtable-32.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  */
   5
   6 #ifndef _ASM_RISCV_PGTABLE_32_H
   7 #define _ASM_RISCV_PGTABLE_32_H
   8
   9 #include <asm-generic/pgtable-nopmd.h>
  10 #include <linux/bits.h>
  11 #include <linux/const.h>
  12
  13 /* Size of region mapped by a page global directory */
  14 #define PGDIR_SHIFT     22
  15 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
  16 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  17
  18 #define MAX_POSSIBLE_PHYSMEM_BITS 34
  19
  20 /*
  21  * rv32 PTE format:
  22  * | XLEN-1  10 | 9             8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
  23  *       PFN      reserved for SW   D   A   G   U   X   W   R   V
  24  */
  25 #define _PAGE_PFN_MASK  GENMASK(31, 10)
  26
  27 #define _PAGE_NOCACHE           0
  28 #define _PAGE_IO                0
  29 #define _PAGE_MTMASK            0
  30
  31 /* Set of bits to preserve across pte_modify() */
  32 #define _PAGE_CHG_MASK  (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ |  \
  33                                           _PAGE_WRITE | _PAGE_EXEC |    \
  34                                           _PAGE_USER | _PAGE_GLOBAL))
  35
  36 static const __maybe_unused int pgtable_l4_enabled;
  37 static const __maybe_unused int pgtable_l5_enabled;
  38
  39 #endif /* _ASM_RISCV_PGTABLE_32_H */