1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * linux/arch/unicore32/include/asm/pgalloc.h
4 *
5 * Code specific to PKUnity SoC and UniCore ISA
6 *
7 * Copyright (C) 2001-2010 GUAN Xue-tao
8 */
9 #ifndef __UNICORE_PGALLOC_H__
10 #define __UNICORE_PGALLOC_H__
11
12 #include <asm/pgtable-hwdef.h>
13 #include <asm/processor.h>
14 #include <asm/cacheflush.h>
15 #include <asm/tlbflush.h>
16
17 #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
18 #define __HAVE_ARCH_PTE_ALLOC_ONE
19 #include <asm-generic/pgalloc.h>
20
21 #define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
22 #define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_PRESENT)
23
24 extern pgd_t *get_pgd_slow(struct mm_struct *mm);
25 extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
26
27 #define pgd_alloc(mm) get_pgd_slow(mm)
28 #define pgd_free(mm, pgd) free_pgd_slow(mm, pgd)
29
30 /*
31 * Allocate one PTE table.
32 */
33 static inline pte_t *
pte_alloc_one_kernel(struct mm_struct * mm)34 pte_alloc_one_kernel(struct mm_struct *mm)
35 {
36 pte_t *pte = __pte_alloc_one_kernel(mm);
37
38 if (pte)
39 clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
40
41 return pte;
42 }
43
44 static inline pgtable_t
pte_alloc_one(struct mm_struct * mm)45 pte_alloc_one(struct mm_struct *mm)
46 {
47 struct page *pte;
48
49 pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
50 if (!pte)
51 return NULL;
52 if (!PageHighMem(pte))
53 clean_pte_table(page_address(pte));
54 return pte;
55 }
56
__pmd_populate(pmd_t * pmdp,unsigned long pmdval)57 static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
58 {
59 set_pmd(pmdp, __pmd(pmdval));
60 flush_pmd_entry(pmdp);
61 }
62
63 /*
64 * Populate the pmdp entry with a pointer to the pte. This pmd is part
65 * of the mm address space.
66 */
67 static inline void
pmd_populate_kernel(struct mm_struct * mm,pmd_t * pmdp,pte_t * ptep)68 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
69 {
70 unsigned long pte_ptr = (unsigned long)ptep;
71
72 /*
73 * The pmd must be loaded with the physical
74 * address of the PTE table
75 */
76 __pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
77 }
78
79 static inline void
pmd_populate(struct mm_struct * mm,pmd_t * pmdp,pgtable_t ptep)80 pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
81 {
82 __pmd_populate(pmdp,
83 page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
84 }
85 #define pmd_pgtable(pmd) pmd_page(pmd)
86
87 #endif
88
