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_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
19 #define pmd_free(mm, pmd) do { } while (0)
20 #define pgd_populate(mm, pmd, pte) BUG()
21 #define pmd_pgtable(pmd) pmd_page(pmd)
22
23 extern pgd_t *pgd_alloc(struct mm_struct *mm);
24 extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
25
pte_alloc_one(struct mm_struct * mm)26 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
27 {
28 pgtable_t pte;
29
30 pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
31 if (pte)
32 cpu_dcache_wb_page((unsigned long)page_address(pte));
33
34 return pte;
35 }
36
37 /*
38 * Populate the pmdp entry with a pointer to the pte. This pmd is part
39 * of the mm address space.
40 *
41 * Ensure that we always set both PMD entries.
42 */
43 static inline void
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * ptep)44 pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
45 {
46 unsigned long pte_ptr = (unsigned long)ptep;
47 unsigned long pmdval;
48
49 BUG_ON(mm != &init_mm);
50
51 /*
52 * The pmd must be loaded with the physical
53 * address of the PTE table
54 */
55 pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
56 set_pmd(pmdp, __pmd(pmdval));
57 }
58
59 static inline void
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t ptep)60 pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
61 {
62 unsigned long pmdval;
63
64 BUG_ON(mm == &init_mm);
65
66 pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
67 set_pmd(pmdp, __pmd(pmdval));
68 }
69
70 #endif
71
