root/arch/m68k/include/asm/sun3_pgalloc.h

INCLUDED FROM

DEFINITIONS

1. pmd_populate_kernel
2. pmd_populate
3. pgd_free
4. pgd_alloc

   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 pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  21 
  22 #define __pte_free_tlb(tlb,pte,addr)                    \
  23 do {                                                    \
  24         pgtable_pte_page_dtor(pte);                     \
  25         tlb_remove_page((tlb), pte);                    \
  26 } while (0)
  27 
  28 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  29 {
  30         pmd_val(*pmd) = __pa((unsigned long)pte);
  31 }
  32 
  33 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
  34 {
  35         pmd_val(*pmd) = __pa((unsigned long)page_address(page));
  36 }
  37 #define pmd_pgtable(pmd) pmd_page(pmd)
  38 
  39 /*
  40  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  41  * inside the pgd, so has no extra memory associated with it.
  42  */
  43 #define pmd_free(mm, x)                 do { } while (0)
  44 #define __pmd_free_tlb(tlb, x, addr)    do { } while (0)
  45 
  46 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  47 {
  48         free_page((unsigned long) pgd);
  49 }
  50 
  51 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
  52 {
  53      pgd_t *new_pgd;
  54 
  55      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  56      memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  57      memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
  58      return new_pgd;
  59 }
  60 
  61 #define pgd_populate(mm, pmd, pte) BUG()
  62 
  63 #endif /* SUN3_PGALLOC_H */