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{
  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
  26extern 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, pte) (pmd_val(*pmd) = (unsigned long)(pte))
  32
  33#define pmd_populate_kernel pmd_populate
  34
  35static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pgtable,
  36                                  unsigned long address)
  37{
  38        struct page *page = virt_to_page(pgtable);
  39
  40        pgtable_pte_page_dtor(page);
  41        __free_page(page);
  42}
  43
  44static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
  45{
  46        struct page *page = alloc_pages(GFP_DMA, 0);
  47        pte_t *pte;
  48
  49        if (!page)
  50                return NULL;
  51        if (!pgtable_pte_page_ctor(page)) {
  52                __free_page(page);
  53                return NULL;
  54        }
  55
  56        pte = page_address(page);
  57        clear_page(pte);
  58
  59        return pte;
  60}
  61
  62static inline void pte_free(struct mm_struct *mm, pgtable_t pgtable)
  63{
  64        struct page *page = virt_to_page(pgtable);
  65
  66        pgtable_pte_page_dtor(page);
  67        __free_page(page);
  68}
  69
  70/*
  71 * In our implementation, each pgd entry contains 1 pmd that is never allocated
  72 * or freed.  pgd_present is always 1, so this should never be called. -NL
  73 */
  74#define pmd_free(mm, pmd) BUG()
  75
  76static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  77{
  78        free_page((unsigned long) pgd);
  79}
  80
  81static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  82{
  83        pgd_t *new_pgd;
  84
  85        new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
  86        if (!new_pgd)
  87                return NULL;
  88        memcpy(new_pgd, swapper_pg_dir, PTRS_PER_PGD * sizeof(pgd_t));
  89        memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
  90        return new_pgd;
  91}
  92
  93#endif /* M68K_MCF_PGALLOC_H */
  94