1 /* SPDX-License-Identifier: GPL-2.0-or-later */
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
9 * OpenRISC implementation:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
15 #ifndef __ASM_OPENRISC_PGALLOC_H
16 #define __ASM_OPENRISC_PGALLOC_H
19 #include <linux/threads.h>
21 #include <linux/memblock.h>
23 extern int mem_init_done;
25 #define pmd_populate_kernel(mm, pmd, pte) \
26 set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
28 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
31 set_pmd(pmd, __pmd(_KERNPG_TABLE +
32 ((unsigned long)page_to_pfn(pte) <<
33 (unsigned long) PAGE_SHIFT)));
37 * Allocate and free page tables.
39 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
41 pgd_t *ret = (pgd_t *)__get_free_page(GFP_KERNEL);
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));
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.
58 extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
60 return (pgd_t *)get_zeroed_page(GFP_KERNEL);
64 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
66 free_page((unsigned long)pgd);
69 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
71 static inline struct page *pte_alloc_one(struct mm_struct *mm)
74 pte = alloc_pages(GFP_KERNEL, 0);
77 clear_page(page_address(pte));
78 if (!pgtable_page_ctor(pte)) {
85 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
87 free_page((unsigned long)pte);
90 static inline void pte_free(struct mm_struct *mm, struct page *pte)
92 pgtable_page_dtor(pte);
96 #define __pte_free_tlb(tlb, pte, addr) \
98 pgtable_page_dtor(pte); \
99 tlb_remove_page((tlb), (pte)); \
102 #define pmd_pgtable(pmd) pmd_page(pmd)
104 #define check_pgt_cache() do { } while (0)