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{
  37        return quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
  38}
  39
  40static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
  41{
  42        struct page *page;
  43        void *pg;
  44
  45        pg = quicklist_alloc(QUICK_PT, GFP_KERNEL, NULL);
  46        if (!pg)
  47                return NULL;
  48        page = virt_to_page(pg);
  49        if (!pgtable_page_ctor(page)) {
  50                quicklist_free(QUICK_PT, NULL, pg);
  51                return NULL;
  52        }
  53        return page;
  54}
  55
  56static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  57{
  58        quicklist_free(QUICK_PT, NULL, pte);
  59}
  60
  61static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  62{
  63        pgtable_page_dtor(pte);
  64        quicklist_free_page(QUICK_PT, NULL, pte);
  65}
  66
  67#define __pte_free_tlb(tlb,pte,addr)                    \
  68do {                                                    \
  69        pgtable_page_dtor(pte);                         \
  70        tlb_remove_page((tlb), (pte));                  \
  71} while (0)
  72
  73#if CONFIG_PGTABLE_LEVELS > 2
  74#define __pmd_free_tlb(tlb, pmdp, addr)                 \
  75do {                                                    \
  76        struct page *page = virt_to_page(pmdp);         \
  77        pgtable_pmd_page_dtor(page);                    \
  78        tlb_remove_page((tlb), page);                   \
  79} while (0);
  80#endif
  81
  82static inline void check_pgt_cache(void)
  83{
  84        quicklist_trim(QUICK_PT, NULL, 25, 16);
  85}
  86
  87#endif /* __ASM_SH_PGALLOC_H */
  88