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/* 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
 
 
 
 23extern int mem_init_done;
 24
 25#define pmd_populate_kernel(mm, pmd, pte) \
 26	set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
 27
 28static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 29				struct page *pte)
 30{
 31	set_pmd(pmd, __pmd(_KERNPG_TABLE +
 32		     ((unsigned long)page_to_pfn(pte) <<
 33		     (unsigned long) PAGE_SHIFT)));
 34}
 35
 36/*
 37 * Allocate and free page tables.
 38 */
 39static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 40{
 41	pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
 42
 43	if (ret) {
 44		memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
 45		memcpy(ret + USER_PTRS_PER_PGD,
 46		       swapper_pg_dir + USER_PTRS_PER_PGD,
 47		       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
 48
 49	}
 50	return ret;
 51}
 52
 53#if 0
 54/* FIXME: This seems to be the preferred style, but we are using
 55 * current_pgd (from mm->pgd) to load kernel pages so we need it
 56 * initialized.  This needs to be looked into.
 57 */
 58extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
 59{
 60	return (pgd_t *)get_zeroed_page(GFP_KERNEL);
 61}
 62#endif
 63
 64static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 65{
 66	free_page((unsigned long)pgd);
 67}
 68
 69extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
 70
 71static inline struct page *pte_alloc_one(struct mm_struct *mm)
 72{
 73	struct page *pte;
 74	pte = alloc_pages(GFP_KERNEL, 0);
 75	if (!pte)
 76		return NULL;
 77	clear_page(page_address(pte));
 78	if (!pgtable_pte_page_ctor(pte)) {
 79		__free_page(pte);
 80		return NULL;
 81	}
 82	return pte;
 83}
 84
 85static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 86{
 87	free_page((unsigned long)pte);
 88}
 89
 90static inline void pte_free(struct mm_struct *mm, struct page *pte)
 91{
 92	pgtable_pte_page_dtor(pte);
 93	__free_page(pte);
 94}
 95
 96#define __pte_free_tlb(tlb, pte, addr)	\
 97do {					\
 98	pgtable_pte_page_dtor(pte);	\
 99	tlb_remove_page((tlb), (pte));	\
100} while (0)
101
102#define pmd_pgtable(pmd) pmd_page(pmd)
103
104#endif