arch/m68k/include/asm/sun3_pgalloc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* sun3_pgalloc.h --
   3  * reorganization around 2.3.39, routines moved from sun3_pgtable.h
   4  *
   5  *
   6  * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
   7  *
   8  * moved 1/26/2000 Sam Creasey
   9  */
  10
  11 #ifndef _SUN3_PGALLOC_H
  12 #define _SUN3_PGALLOC_H
  13
  14 #include <asm/tlb.h>
  15
  16 #include <asm-generic/pgalloc.h>        /* for pte_{alloc,free}_one */
  17
  18 extern const char bad_pmd_string[];
  19
  20 #define __pte_free_tlb(tlb,pte,addr)                    \
  21 do {                                                    \
  22         pgtable_pte_page_dtor(pte);                     \
  23         tlb_remove_page((tlb), pte);                    \
  24 } while (0)
  25
  26 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  27 {
  28         pmd_val(*pmd) = __pa((unsigned long)pte);
  29 }
  30
  31 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
  32 {
  33         pmd_val(*pmd) = __pa((unsigned long)page_address(page));
  34 }
  35 #define pmd_pgtable(pmd) pmd_page(pmd)
  36
  37 /*
  38  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  39  * inside the pgd, so has no extra memory associated with it.
  40  */
  41 #define pmd_free(mm, x)                 do { } while (0)
  42
  43 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  44 {
  45         free_page((unsigned long) pgd);
  46 }
  47
  48 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
  49 {
  50      pgd_t *new_pgd;
  51
  52      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  53      memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  54      memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
  55      return new_pgd;
  56 }
  57
  58 #endif /* SUN3_PGALLOC_H */