1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun // Copyright (C) 2005-2017 Andes Technology Corporation
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun #ifndef _ASMNDS32_PGALLOC_H
5*4882a593Smuzhiyun #define _ASMNDS32_PGALLOC_H
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <asm/processor.h>
8*4882a593Smuzhiyun #include <asm/cacheflush.h>
9*4882a593Smuzhiyun #include <asm/tlbflush.h>
10*4882a593Smuzhiyun #include <asm/proc-fns.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #define __HAVE_ARCH_PTE_ALLOC_ONE
13*4882a593Smuzhiyun #include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun /*
16*4882a593Smuzhiyun * Since we have only two-level page tables, these are trivial
17*4882a593Smuzhiyun */
18*4882a593Smuzhiyun #define pmd_pgtable(pmd) pmd_page(pmd)
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun extern pgd_t *pgd_alloc(struct mm_struct *mm);
21*4882a593Smuzhiyun extern void pgd_free(struct mm_struct *mm, pgd_t * pgd);
22*4882a593Smuzhiyun
pte_alloc_one(struct mm_struct * mm)23*4882a593Smuzhiyun static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun pgtable_t pte;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
28*4882a593Smuzhiyun if (pte)
29*4882a593Smuzhiyun cpu_dcache_wb_page((unsigned long)page_address(pte));
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun return pte;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun /*
35*4882a593Smuzhiyun * Populate the pmdp entry with a pointer to the pte. This pmd is part
36*4882a593Smuzhiyun * of the mm address space.
37*4882a593Smuzhiyun *
38*4882a593Smuzhiyun * Ensure that we always set both PMD entries.
39*4882a593Smuzhiyun */
40*4882a593Smuzhiyun static inline void
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * ptep)41*4882a593Smuzhiyun pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmdp, pte_t * ptep)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun unsigned long pte_ptr = (unsigned long)ptep;
44*4882a593Smuzhiyun unsigned long pmdval;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun BUG_ON(mm != &init_mm);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun /*
49*4882a593Smuzhiyun * The pmd must be loaded with the physical
50*4882a593Smuzhiyun * address of the PTE table
51*4882a593Smuzhiyun */
52*4882a593Smuzhiyun pmdval = __pa(pte_ptr) | _PAGE_KERNEL_TABLE;
53*4882a593Smuzhiyun set_pmd(pmdp, __pmd(pmdval));
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun static inline void
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t ptep)57*4882a593Smuzhiyun pmd_populate(struct mm_struct *mm, pmd_t * pmdp, pgtable_t ptep)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun unsigned long pmdval;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun BUG_ON(mm == &init_mm);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun pmdval = page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE;
64*4882a593Smuzhiyun set_pmd(pmdp, __pmd(pmdval));
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun #endif
68