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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