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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SH_PGALLOC_H
   3#define __ASM_SH_PGALLOC_H
   4
   5#include <linux/quicklist.h>
   6#include <asm/page.h>
   7
   8#define QUICK_PT 0      /* Other page table pages that are zero on free */
   9
  10extern pgd_t *pgd_alloc(struct mm_struct *);
  11extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  12
  13#if PAGETABLE_LEVELS > 2
  14extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
  15extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address);
  16extern void pmd_free(struct mm_struct *mm, pmd_t *pmd);
  17#endif
  18
  19static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  20                                       pte_t *pte)
  21{
  22        set_pmd(pmd, __pmd((unsigned long)pte));
  23}
  24
  25static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  26                                pgtable_t pte)
  27{
  28        set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
  29}
  30#define pmd_pgtable(pmd) pmd_page(pmd)
  31
  32/*
  33 * Allocate and free page tables.
  34 */
  35static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  36                                          unsigned long address)
  37{
  38        return quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
  39}
  40
  41static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  42                                        unsigned long address)
  43{
  44        struct page *page;
  45        void *pg;
  46
  47        pg = quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
  48        if (!pg)
  49                return NULL;
  50        page = virt_to_page(pg);
  51        if (!pgtable_page_ctor(page)) {
  52                quicklist_free(QUICK_PT, NULL, pg);
  53                return NULL;
  54        }
  55        return page;
  56}
  57
  58static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  59{
  60        quicklist_free(QUICK_PT, NULL, pte);
  61}
  62
  63static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  64{
  65        pgtable_page_dtor(pte);
  66        quicklist_free_page(QUICK_PT, NULL, pte);
  67}
  68
  69#define __pte_free_tlb(tlb,pte,addr)                    \
  70do {                                                    \
  71        pgtable_page_dtor(pte);                         \
  72        tlb_remove_page((tlb), (pte));                  \
  73} while (0)
  74
  75static inline void check_pgt_cache(void)
  76{
  77        quicklist_trim(QUICK_PT, NULL, 25, 16);
  78}
  79
  80#endif /* __ASM_SH_PGALLOC_H */
  81