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