linux/arch/parisc/include/asm/pgalloc.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_PGALLOC_H
   3#define _ASM_PGALLOC_H
   4
   5#include <linux/gfp.h>
   6#include <linux/mm.h>
   7#include <linux/threads.h>
   8#include <asm/processor.h>
   9#include <asm/fixmap.h>
  10
  11#include <asm/cache.h>
  12
  13#define __HAVE_ARCH_PMD_ALLOC_ONE
  14#define __HAVE_ARCH_PMD_FREE
  15#define __HAVE_ARCH_PGD_FREE
  16#include <asm-generic/pgalloc.h>
  17
  18/* Allocate the top level pgd (page directory) */
  19static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  20{
  21        pgd_t *pgd;
  22
  23        pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER);
  24        if (unlikely(pgd == NULL))
  25                return NULL;
  26
  27        memset(pgd, 0, PAGE_SIZE << PGD_ORDER);
  28
  29        return pgd;
  30}
  31
  32static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  33{
  34        free_pages((unsigned long)pgd, PGD_ORDER);
  35}
  36
  37#if CONFIG_PGTABLE_LEVELS == 3
  38
  39/* Three Level Page Table Support for pmd's */
  40
  41static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  42{
  43        set_pud(pud, __pud((PxD_FLAG_PRESENT | PxD_FLAG_VALID) +
  44                        (__u32)(__pa((unsigned long)pmd) >> PxD_VALUE_SHIFT)));
  45}
  46
  47static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  48{
  49        pmd_t *pmd;
  50
  51        pmd = (pmd_t *)__get_free_pages(GFP_PGTABLE_KERNEL, PMD_ORDER);
  52        if (likely(pmd))
  53                memset ((void *)pmd, 0, PAGE_SIZE << PMD_ORDER);
  54        return pmd;
  55}
  56
  57static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  58{
  59        free_pages((unsigned long)pmd, PMD_ORDER);
  60}
  61#endif
  62
  63static inline void
  64pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  65{
  66        set_pmd(pmd, __pmd((PxD_FLAG_PRESENT | PxD_FLAG_VALID)
  67                + (__u32)(__pa((unsigned long)pte) >> PxD_VALUE_SHIFT)));
  68}
  69
  70#define pmd_populate(mm, pmd, pte_page) \
  71        pmd_populate_kernel(mm, pmd, page_address(pte_page))
  72
  73#endif
  74