arch/m68k/include/asm/mcf_pgalloc.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef M68K_MCF_PGALLOC_H
   3 #define M68K_MCF_PGALLOC_H
   4
   5 #include <asm/tlb.h>
   6 #include <asm/tlbflush.h>
   7
   8 extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
   9 {
  10         free_page((unsigned long) pte);
  11 }
  12
  13 extern const char bad_pmd_string[];
  14
  15 extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
  16 {
  17         unsigned long page = __get_free_page(GFP_DMA);
  18
  19         if (!page)
  20                 return NULL;
  21
  22         memset((void *)page, 0, PAGE_SIZE);
  23         return (pte_t *) (page);
  24 }
  25
  26 extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
  27 {
  28         return (pmd_t *) pgd;
  29 }
  30
  31 #define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
  32         (unsigned long)(page_address(page)))
  33
  34 #define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
  35
  36 #define pmd_pgtable(pmd) pmd_page(pmd)
  37
  38 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
  39                                   unsigned long address)
  40 {
  41         pgtable_pte_page_dtor(page);
  42         __free_page(page);
  43 }
  44
  45 static inline struct page *pte_alloc_one(struct mm_struct *mm)
  46 {
  47         struct page *page = alloc_pages(GFP_DMA, 0);
  48         pte_t *pte;
  49
  50         if (!page)
  51                 return NULL;
  52         if (!pgtable_pte_page_ctor(page)) {
  53                 __free_page(page);
  54                 return NULL;
  55         }
  56
  57         pte = kmap(page);
  58         if (pte) {
  59                 clear_page(pte);
  60                 __flush_page_to_ram(pte);
  61                 flush_tlb_kernel_page(pte);
  62                 nocache_page(pte);
  63         }
  64         kunmap(page);
  65
  66         return page;
  67 }
  68
  69 static inline void pte_free(struct mm_struct *mm, struct page *page)
  70 {
  71         pgtable_pte_page_dtor(page);
  72         __free_page(page);
  73 }
  74
  75 /*
  76  * In our implementation, each pgd entry contains 1 pmd that is never allocated
  77  * or freed.  pgd_present is always 1, so this should never be called. -NL
  78  */
  79 #define pmd_free(mm, pmd) BUG()
  80
  81 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  82 {
  83         free_page((unsigned long) pgd);
  84 }
  85
  86 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  87 {
  88         pgd_t *new_pgd;
  89
  90         new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
  91         if (!new_pgd)
  92                 return NULL;
  93         memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  94         memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
  95         return new_pgd;
  96 }
  97
  98 #endif /* M68K_MCF_PGALLOC_H */