1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * OpenRISC Linux
 4 *
 5 * Linux architectural port borrowing liberally from similar works of
 6 * others.  All original copyrights apply as per the original source
 7 * declaration.
 8 *
 9 * OpenRISC implementation:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 * et al.
 
 
 
 
 
13 */
14
15#ifndef __ASM_OPENRISC_PGALLOC_H
16#define __ASM_OPENRISC_PGALLOC_H
17
18#include <asm/page.h>
19#include <linux/threads.h>
20#include <linux/mm.h>
21#include <linux/memblock.h>
22
23#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
24#include <asm-generic/pgalloc.h>
25
26extern int mem_init_done;
27
28#define pmd_populate_kernel(mm, pmd, pte) \
29	set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
30
31static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
32				struct page *pte)
33{
34	set_pmd(pmd, __pmd(_KERNPG_TABLE +
35		     ((unsigned long)page_to_pfn(pte) <<
36		     (unsigned long) PAGE_SHIFT)));
37}
38
39/*
40 * Allocate and free page tables.
41 */
42static inline pgd_t *pgd_alloc(struct mm_struct *mm)
43{
44	pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
45
46	if (ret) {
47		memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
48		memcpy(ret + USER_PTRS_PER_PGD,
49		       swapper_pg_dir + USER_PTRS_PER_PGD,
50		       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
51
52	}
53	return ret;
54}
55
56#if 0
57/* FIXME: This seems to be the preferred style, but we are using
58 * current_pgd (from mm->pgd) to load kernel pages so we need it
59 * initialized.  This needs to be looked into.
60 */
61extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
62{
63	return (pgd_t *)get_zeroed_page(GFP_KERNEL);
64}
65#endif
66
67extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
68
69#define __pte_free_tlb(tlb, pte, addr)				\
70do {								\
71	pagetable_pte_dtor(page_ptdesc(pte));			\
72	tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte)));	\
73} while (0)
74
75#endif

 
  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
 
 
 
 27extern int mem_init_done;
 28
 29#define pmd_populate_kernel(mm, pmd, pte) \
 30	set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
 31
 32static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 33				struct page *pte)
 34{
 35	set_pmd(pmd, __pmd(_KERNPG_TABLE +
 36		     ((unsigned long)page_to_pfn(pte) <<
 37		     (unsigned long) PAGE_SHIFT)));
 38}
 39
 40/*
 41 * Allocate and free page tables.
 42 */
 43static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 44{
 45	pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
 46
 47	if (ret) {
 48		memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
 49		memcpy(ret + USER_PTRS_PER_PGD,
 50		       swapper_pg_dir + USER_PTRS_PER_PGD,
 51		       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
 52
 53	}
 54	return ret;
 55}
 56
 57#if 0
 58/* FIXME: This seems to be the preferred style, but we are using
 59 * current_pgd (from mm->pgd) to load kernel pages so we need it
 60 * initialized.  This needs to be looked into.
 61 */
 62extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
 63{
 64	return (pgd_t *)get_zeroed_page(GFP_KERNEL);
 65}
 66#endif
 67
 68static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 69{
 70	free_page((unsigned long)pgd);
 71}
 72
 73extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
 74
 75static inline struct page *pte_alloc_one(struct mm_struct *mm,
 76					 unsigned long address)
 77{
 78	struct page *pte;
 79	pte = alloc_pages(GFP_KERNEL, 0);
 80	if (!pte)
 81		return NULL;
 82	clear_page(page_address(pte));
 83	if (!pgtable_page_ctor(pte)) {
 84		__free_page(pte);
 85		return NULL;
 86	}
 87	return pte;
 88}
 89
 90static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 91{
 92	free_page((unsigned long)pte);
 93}
 94
 95static inline void pte_free(struct mm_struct *mm, struct page *pte)
 96{
 97	pgtable_page_dtor(pte);
 98	__free_page(pte);
 99}
100
101
102#define __pte_free_tlb(tlb, pte, addr) tlb_remove_page((tlb), (pte))
103#define pmd_pgtable(pmd) pmd_page(pmd)
104
105#define check_pgt_cache()          do { } while (0)
 
 
 
 
106
107#endif