1 /* SPDX-License-Identifier: GPL-2.0 */
2 // Copyright (C) 2005-2017 Andes Technology Corporation
3
4 #ifndef _ASMNDS32_PGALLOC_H
5 #define _ASMNDS32_PGALLOC_H
6
7 #include <asm/processor.h>
8 #include <asm/cacheflush.h>
9 #include <asm/tlbflush.h>
10 #include <asm/proc-fns.h>
11
12 #define __HAVE_ARCH_PTE_ALLOC_ONE
13 #include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
14
15 /*
16 * Since we have only two-level page tables, these are trivial
17 */
18 #define pmd_pgtable(pmd) pmd_page(pmd)
19
20 extern pgd_t *pgd_alloc(struct mm_struct *mm);
21 extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
22
pte_alloc_one(struct mm_struct * mm)23 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
24 {
25 pgtable_t pte;
26
27 pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
28 if (pte)
29 cpu_dcache_wb_page((unsigned long)page_address(pte));
30
31 return pte;
32 }
33
34 /*
35 * Populate the pmdp entry with a pointer to the pte. This pmd is part
36 * of the mm address space.
37 *
38 * Ensure that we always set both PMD entries.
39 */
40 static inline void
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * ptep)41 pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
42 {
43 unsigned long pte_ptr = (unsigned long)ptep;
44 unsigned long pmdval;
45
46 BUG_ON(mm != &init_mm);
47
48 /*
49 * The pmd must be loaded with the physical
50 * address of the PTE table
51 */
52 pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
53 set_pmd(pmdp, __pmd(pmdval));
54 }
55
56 static inline void
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t ptep)57 pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
58 {
59 unsigned long pmdval;
60
61 BUG_ON(mm == &init_mm);
62
63 pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
64 set_pmd(pmdp, __pmd(pmdval));
65 }
66
67 #endif
68