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 extern const char bad_pmd_string[];
  17
  18 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  19
  20
  21 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  22 {
  23         free_page((unsigned long) pte);
  24 }
  25
  26 static 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)                    \
  33 do {                                                    \
  34         pgtable_page_dtor(pte);                         \
  35         tlb_remove_page((tlb), pte);                    \
  36 } while (0)
  37
  38 static 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
  50 static 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
  67 static 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
  72 static 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
  85 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  86 {
  87         free_page((unsigned long) pgd);
  88 }
  89
  90 static 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 */