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Linux/arch/xtensa/include/asm/pgalloc.h

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  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 #include <linux/highmem.h>
 12 #include <linux/slab.h>
 13 
 14 /*
 15  * Allocating and freeing a pmd is trivial: the 1-entry pmd is
 16  * inside the pgd, so has no extra memory associated with it.
 17  */
 18 
 19 #define pmd_populate_kernel(mm, pmdp, ptep)                                  \
 20         (pmd_val(*(pmdp)) = ((unsigned long)ptep))
 21 #define pmd_populate(mm, pmdp, page)                                         \
 22         (pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
 23 #define pmd_pgtable(pmd) pmd_page(pmd)
 24 
 25 static inline pgd_t*
 26 pgd_alloc(struct mm_struct *mm)
 27 {
 28         return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
 29 }
 30 
 31 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 32 {
 33         free_page((unsigned long)pgd);
 34 }
 35 
 36 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
 37 {
 38         pte_t *ptep;
 39         int i;
 40 
 41         ptep = (pte_t *)__get_free_page(GFP_KERNEL);
 42         if (!ptep)
 43                 return NULL;
 44         for (i = 0; i < 1024; i++)
 45                 pte_clear(NULL, 0, ptep + i);
 46         return ptep;
 47 }
 48 
 49 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
 50 {
 51         pte_t *pte;
 52         struct page *page;
 53 
 54         pte = pte_alloc_one_kernel(mm);
 55         if (!pte)
 56                 return NULL;
 57         page = virt_to_page(pte);
 58         if (!pgtable_pte_page_ctor(page)) {
 59                 __free_page(page);
 60                 return NULL;
 61         }
 62         return page;
 63 }
 64 
 65 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 66 {
 67         free_page((unsigned long)pte);
 68 }
 69 
 70 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 71 {
 72         pgtable_pte_page_dtor(pte);
 73         __free_page(pte);
 74 }
 75 #define pmd_pgtable(pmd) pmd_page(pmd)
 76 
 77 #endif /* _XTENSA_PGALLOC_H */
 78 

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