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        __free_page(page);
  48}
  49
  50#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
  51
  52static inline struct page *pte_alloc_one(struct mm_struct *mm,
  53        unsigned long address)
  54{
  55        struct page *page = alloc_pages(GFP_DMA, 0);
  56        pte_t *pte;
  57
  58        if (!page)
  59                return NULL;
  60        if (!pgtable_page_ctor(page)) {
  61                __free_page(page);
  62                return NULL;
  63        }
  64
  65        pte = kmap(page);
  66        if (pte) {
  67                clear_page(pte);
  68                __flush_page_to_ram(pte);
  69                flush_tlb_kernel_page(pte);
  70                nocache_page(pte);
  71        }
  72        kunmap(page);
  73
  74        return page;
  75}
  76
  77extern inline void pte_free(struct mm_struct *mm, struct page *page)
  78{
  79        __free_page(page);
  80}
  81
  82/*
  83 * In our implementation, each pgd entry contains 1 pmd that is never allocated
  84 * or freed.  pgd_present is always 1, so this should never be called. -NL
  85 */
  86#define pmd_free(mm, pmd) BUG()
  87
  88static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  89{
  90        free_page((unsigned long) pgd);
  91}
  92
  93static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  94{
  95        pgd_t *new_pgd;
  96
  97        new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
  98        if (!new_pgd)
  99                return NULL;
 100        memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
 101        memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
 102        return new_pgd;
 103}
 104
 105#define pgd_populate(mm, pmd, pte) BUG()
 106
 107#endif /* M68K_MCF_PGALLOC_H */
 108