LXR linux/arch/m68k/include/asm/sun3

   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
  16extern const char bad_pmd_string[];
  17
  18#define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  19
  20
  21static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  22{
  23        free_page((unsigned long) pte);
  24}
  25
  26static inline void pte_free(struct mm_struct *mm, pgtable_t page)
  27{
  28        pgtable_page_dtor(page);
  29        __free_page(page);
  30}
  31
  32#define __pte_free_tlb(tlb,pte,addr)                    \
  33do {                                                    \
  34        pgtable_page_dtor(pte);                         \
  35        tlb_remove_page((tlb), pte);                    \
  36} while (0)
  37
  38static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  39                                          unsigned long address)
  40{
  41        unsigned long page = __get_free_page(GFP_KERNEL);
  42
  43        if (!page)
  44                return NULL;
  45
  46        memset((void *)page, 0, PAGE_SIZE);
  47        return (pte_t *) (page);
  48}
  49
  50static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  51                                        unsigned long address)
  52{
  53        struct page *page = alloc_pages(GFP_KERNEL, 0);
  54
  55        if (page == NULL)
  56                return NULL;
  57
  58        clear_highpage(page);
  59        if (!pgtable_page_ctor(page)) {
  60                __free_page(page);
  61                return NULL;
  62        }
  63        return page;
  64
  65}
  66
  67static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  68{
  69        pmd_val(*pmd) = __pa((unsigned long)pte);
  70}
  71
  72static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
  73{
  74        pmd_val(*pmd) = __pa((unsigned long)page_address(page));
  75}
  76#define pmd_pgtable(pmd) pmd_page(pmd)
  77
  78/*
  79 * allocating and freeing a pmd is trivial: the 1-entry pmd is
  80 * inside the pgd, so has no extra memory associated with it.
  81 */
  82#define pmd_free(mm, x)                 do { } while (0)
  83#define __pmd_free_tlb(tlb, x, addr)    do { } while (0)
  84
  85static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  86{
  87        free_page((unsigned long) pgd);
  88}
  89
  90static inline pgd_t * pgd_alloc(struct mm_struct *mm)
  91{
  92     pgd_t *new_pgd;
  93
  94     new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  95     memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  96     memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
  97     return new_pgd;
  98}
  99
 100#define pgd_populate(mm, pmd, pte) BUG()
 101
 102#endif /* SUN3_PGALLOC_H */
 103