linux/arch/m68k/include/asm/sun3_pgalloc.h
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   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>
  17
  18extern const char bad_pmd_string[];
  19
  20#define __pte_free_tlb(tlb,pte,addr)                    \
  21do {                                                    \
  22        pgtable_pte_page_dtor(pte);                     \
  23        tlb_remove_page((tlb), pte);                    \
  24} while (0)
  25
  26static 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
  31static 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
  36/*
  37 * allocating and freeing a pmd is trivial: the 1-entry pmd is
  38 * inside the pgd, so has no extra memory associated with it.
  39 */
  40#define pmd_free(mm, x)                 do { } while (0)
  41
  42static inline pgd_t * pgd_alloc(struct mm_struct *mm)
  43{
  44     pgd_t *new_pgd;
  45
  46     new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  47     memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  48     memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
  49     return new_pgd;
  50}
  51
  52#endif /* SUN3_PGALLOC_H */
  53