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		return NULL;
83	clear_page(page_address(pte));
84	if (!pgtable_page_ctor(pte)) {
85		__free_page(pte);
86		return NULL;
87	}
88	return pte;
89}
90
91static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
92{
93	free_page((unsigned long)pte);
94}
95
96static inline void pte_free(struct mm_struct *mm, struct page *pte)
97{
98	pgtable_page_dtor(pte);
99	__free_page(pte);
100}
101
102
103#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
104#define pmd_pgtable(pmd) pmd_page(pmd)
105
106#define check_pgt_cache()          do { } while (0)
107
108#endif
109