LXR linux/arch/xtensa/include/asm/pgalloc.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * include/asm-xtensa/pgalloc.h
   4 *
   5 * Copyright (C) 2001-2007 Tensilica Inc.
   6 */
   7
   8#ifndef _XTENSA_PGALLOC_H
   9#define _XTENSA_PGALLOC_H
  10
  11#ifdef CONFIG_MMU
  12#include <linux/highmem.h>
  13#include <linux/slab.h>
  14
  15#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
  16#define __HAVE_ARCH_PTE_ALLOC_ONE
  17#include <asm-generic/pgalloc.h>
  18
  19/*
  20 * Allocating and freeing a pmd is trivial: the 1-entry pmd is
  21 * inside the pgd, so has no extra memory associated with it.
  22 */
  23
  24#define pmd_populate_kernel(mm, pmdp, ptep)                                  \
  25        (pmd_val(*(pmdp)) = ((unsigned long)ptep))
  26#define pmd_populate(mm, pmdp, page)                                         \
  27        (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
  28
  29static inline pgd_t*
  30pgd_alloc(struct mm_struct *mm)
  31{
  32        return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
  33}
  34
  35static inline void ptes_clear(pte_t *ptep)
  36{
  37        int i;
  38
  39        for (i = 0; i < PTRS_PER_PTE; i++)
  40                pte_clear(NULL, 0, ptep + i);
  41}
  42
  43static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
  44{
  45        pte_t *ptep;
  46
  47        ptep = (pte_t *)__pte_alloc_one_kernel(mm);
  48        if (!ptep)
  49                return NULL;
  50        ptes_clear(ptep);
  51        return ptep;
  52}
  53
  54static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
  55{
  56        struct page *page;
  57
  58        page = __pte_alloc_one(mm, GFP_PGTABLE_USER);
  59        if (!page)
  60                return NULL;
  61        ptes_clear(page_address(page));
  62        return page;
  63}
  64
  65#endif /* CONFIG_MMU */
  66
  67#endif /* _XTENSA_PGALLOC_H */
  68