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
26 extern int mem_init_done;
27
28 #define pmd_populate_kernel(mm, pmd, pte) \
29 set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
30
31 static 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 */
42 static 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 */
61 extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
62 {
63 return (pgd_t *)get_zeroed_page(GFP_KERNEL);
64 }
65 #endif
66
67 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
68
69 #define __pte_free_tlb(tlb, pte, addr) \
70 do { \
71 pagetable_pte_dtor(page_ptdesc(pte)); \
72 tlb_remove_page_ptdesc((tlb), (page_ptdesc(pte))); \
73 } while (0)
74
75 #endif
76
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