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

   1/*
   2 * OpenRISC Linux
   3 *
   4 * Linux architectural port borrowing liberally from similar works of
   5 * others.  All original copyrights apply as per the original source
   6 * declaration.
   7 *
   8 * OpenRISC implementation:
   9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  11 * et al.
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 */
  18
  19#ifndef __ASM_OPENRISC_PGALLOC_H
  20#define __ASM_OPENRISC_PGALLOC_H
  21
  22#include <asm/page.h>
  23#include <linux/threads.h>
  24#include <linux/mm.h>
  25#include <linux/memblock.h>
  26#include <linux/bootmem.h>
  27
  28extern int mem_init_done;
  29
  30#define pmd_populate_kernel(mm, pmd, pte) \
  31        set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
  32
  33static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  34                                struct page *pte)
  35{
  36        set_pmd(pmd, __pmd(_KERNPG_TABLE +
  37                     ((unsigned long)page_to_pfn(pte) <<
  38                     (unsigned long) PAGE_SHIFT)));
  39}
  40
  41/*
  42 * Allocate and free page tables.
  43 */
  44static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  45{
  46        pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
  47
  48        if (ret) {
  49                memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
  50                memcpy(ret + USER_PTRS_PER_PGD,
  51                       swapper_pg_dir + USER_PTRS_PER_PGD,
  52                       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  53
  54        }
  55        return ret;
  56}
  57
  58#if 0
  59/* FIXME: This seems to be the preferred style, but we are using
  60 * current_pgd (from mm->pgd) to load kernel pages so we need it
  61 * initialized.  This needs to be looked into.
  62 */
  63extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
  64{
  65        return (pgd_t *)get_zeroed_page(GFP_KERNEL);
  66}
  67#endif
  68
  69static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  70{
  71        free_page((unsigned long)pgd);
  72}
  73
  74extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
  75
  76static inline struct page *pte_alloc_one(struct mm_struct *mm,
  77                                         unsigned long address)
  78{
  79        struct page *pte;
  80        pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
  81        if (pte)
  82                clear_page(page_address(pte));
  83        return pte;
  84}
  85
  86static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  87{
  88        free_page((unsigned long)pte);
  89}
  90
  91static inline void pte_free(struct mm_struct *mm, struct page *pte)
  92{
  93        __free_page(pte);
  94}
  95
  96
  97#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
  98#define pmd_pgtable(pmd) pmd_page(pmd)
  99
 100#define check_pgt_cache()          do { } while (0)
 101
 102#endif
 103