LXR linux/arch/m32r/include/asm/pgtable-2level.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_M32R_PGTABLE_2LEVEL_H
   3#define _ASM_M32R_PGTABLE_2LEVEL_H
   4#ifdef __KERNEL__
   5
   6/*
   7 * traditional M32R two-level paging structure:
   8 */
   9
  10#define PGDIR_SHIFT     22
  11#define PTRS_PER_PGD    1024
  12
  13/*
  14 * the M32R is two-level, so we don't really have any
  15 * PMD directory physically.
  16 */
  17#define __PAGETABLE_PMD_FOLDED
  18#define PMD_SHIFT       22
  19#define PTRS_PER_PMD    1
  20
  21#define PTRS_PER_PTE    1024
  22
  23#define pte_ERROR(e) \
  24        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
  25#define pmd_ERROR(e) \
  26        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
  27#define pgd_ERROR(e) \
  28        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  29
  30/*
  31 * The "pgd_xxx()" functions here are trivial for a folded two-level
  32 * setup: the pgd is never bad, and a pmd always exists (as it's folded
  33 * into the pgd entry)
  34 */
  35static inline int pgd_none(pgd_t pgd)   { return 0; }
  36static inline int pgd_bad(pgd_t pgd)    { return 0; }
  37static inline int pgd_present(pgd_t pgd)        { return 1; }
  38#define pgd_clear(xp)                           do { } while (0)
  39
  40/*
  41 * Certain architectures need to do special things when PTEs
  42 * within a page table are directly modified.  Thus, the following
  43 * hook is made available.
  44 */
  45#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
  46#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
  47
  48/*
  49 * (pmds are folded into pgds so this doesn't get actually called,
  50 * but the define is needed for a generic inline function.)
  51 */
  52#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
  53#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
  54
  55#define pgd_page_vaddr(pgd) \
  56((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
  57
  58#ifndef CONFIG_DISCONTIGMEM
  59#define pgd_page(pgd)   (mem_map + ((pgd_val(pgd) >> PAGE_SHIFT) - PFN_BASE))
  60#endif /* !CONFIG_DISCONTIGMEM */
  61
  62static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
  63{
  64        return (pmd_t *) dir;
  65}
  66
  67#define ptep_get_and_clear(mm,addr,xp)  __pte(xchg(&(xp)->pte, 0))
  68#define pte_same(a, b)          (pte_val(a) == pte_val(b))
  69#define pte_page(x)             pfn_to_page(pte_pfn(x))
  70#define pte_none(x)             (!pte_val(x))
  71#define pte_pfn(x)              (pte_val(x) >> PAGE_SHIFT)
  72#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  73#define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
  74
  75#endif /* __KERNEL__ */
  76#endif /* _ASM_M32R_PGTABLE_2LEVEL_H */
  77