LXR linux/arch/m68k/include/asm/mcf

   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
   8extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
   9{
  10        free_page((unsigned long) pte);
  11}
  12
  13extern const char bad_pmd_string[];
  14
  15extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  16        unsigned long address)
  17{
  18        unsigned long page = __get_free_page(GFP_DMA);
  19
  20        if (!page)
  21                return NULL;
  22
  23        memset((void *)page, 0, PAGE_SIZE);
  24        return (pte_t *) (page);
  25}
  26
  27extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
  28{
  29        return (pmd_t *) pgd;
  30}
  31
  32#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
  33#define pmd_alloc_one(mm, address)      ({ BUG(); ((pmd_t *)2); })
  34
  35#define pte_alloc_one_fast(mm, addr) pte_alloc_one(mm, addr)
  36
  37#define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
  38        (unsigned long)(page_address(page)))
  39
  40#define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
  41
  42#define pmd_pgtable(pmd) pmd_page(pmd)
  43
  44static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
  45                                  unsigned long address)
  46{
  47        pgtable_page_dtor(page);
  48        __free_page(page);
  49}
  50
  51#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
  52
  53static inline struct page *pte_alloc_one(struct mm_struct *mm,
  54        unsigned long address)
  55{
  56        struct page *page = alloc_pages(GFP_DMA, 0);
  57        pte_t *pte;
  58
  59        if (!page)
  60                return NULL;
  61        if (!pgtable_page_ctor(page)) {
  62                __free_page(page);
  63                return NULL;
  64        }
  65
  66        pte = kmap(page);
  67        if (pte) {
  68                clear_page(pte);
  69                __flush_page_to_ram(pte);
  70                flush_tlb_kernel_page(pte);
  71                nocache_page(pte);
  72        }
  73        kunmap(page);
  74
  75        return page;
  76}
  77
  78static inline void pte_free(struct mm_struct *mm, struct page *page)
  79{
  80        pgtable_page_dtor(page);
  81        __free_page(page);
  82}
  83
  84/*
  85 * In our implementation, each pgd entry contains 1 pmd that is never allocated
  86 * or freed.  pgd_present is always 1, so this should never be called. -NL
  87 */
  88#define pmd_free(mm, pmd) BUG()
  89
  90static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  91{
  92        free_page((unsigned long) pgd);
  93}
  94
  95static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  96{
  97        pgd_t *new_pgd;
  98
  99        new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
 100        if (!new_pgd)
 101                return NULL;
 102        memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
 103        memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
 104        return new_pgd;
 105}
 106
 107#define pgd_populate(mm, pmd, pte) BUG()
 108
 109#endif /* M68K_MCF_PGALLOC_H */
 110