blob: 05c39ecd2efdcb51e1c5288501b5098217630a23 [file] [log] [blame]
* OpenRISC Linux
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
* OpenRISC implementation:
* Copyright (C) 2003 Matjaz Breskvar <>
* Copyright (C) 2010-2011 Jonas Bonn <>
* et al.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
#include <asm/page.h>
#include <linux/threads.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>
extern int mem_init_done;
#define pmd_populate_kernel(mm, pmd, pte) \
set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
struct page *pte)
set_pmd(pmd, __pmd(_KERNPG_TABLE +
((unsigned long)page_to_pfn(pte) <<
(unsigned long) PAGE_SHIFT)));
* Allocate and free page tables.
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
if (ret) {
memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
memcpy(ret + USER_PTRS_PER_PGD,
swapper_pg_dir + USER_PTRS_PER_PGD,
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
return ret;
#if 0
/* FIXME: This seems to be the preferred style, but we are using
* current_pgd (from mm->pgd) to load kernel pages so we need it
* initialized. This needs to be looked into.
extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
return (pgd_t *)get_zeroed_page(GFP_KERNEL);
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
free_page((unsigned long)pgd);
extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
static inline struct page *pte_alloc_one(struct mm_struct *mm,
unsigned long address)
struct page *pte;
pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
if (pte)
return pte;
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
free_page((unsigned long)pte);
static inline void pte_free(struct mm_struct *mm, struct page *pte)
#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
#define pmd_pgtable(pmd) pmd_page(pmd)
#define check_pgt_cache() do { } while (0)