1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* sun3_pgalloc.h --
3  * reorganization around 2.3.39, routines moved from sun3_pgtable.h
4  *
5  *
6  * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
7  *
8  * moved 1/26/2000 Sam Creasey
9  */
10 
11 #ifndef _SUN3_PGALLOC_H
12 #define _SUN3_PGALLOC_H
13 
14 #include <asm/tlb.h>
15 
16 extern const char bad_pmd_string[];
17 
18 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
19 
20 
21 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
22 {
23         free_page((unsigned long) pte);
24 }
25 
26 static inline void pte_free(struct mm_struct *mm, pgtable_t page)
27 {
28 	pgtable_page_dtor(page);
29         __free_page(page);
30 }
31 
32 #define __pte_free_tlb(tlb,pte,addr)			\
33 do {							\
34 	pgtable_page_dtor(pte);				\
35 	tlb_remove_page((tlb), pte);			\
36 } while (0)
37 
38 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
39 {
40 	unsigned long page = __get_free_page(GFP_KERNEL);
41 
42 	if (!page)
43 		return NULL;
44 
45 	memset((void *)page, 0, PAGE_SIZE);
46 	return (pte_t *) (page);
47 }
48 
49 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
50 {
51         struct page *page = alloc_pages(GFP_KERNEL, 0);
52 
53 	if (page == NULL)
54 		return NULL;
55 
56 	clear_highpage(page);
57 	if (!pgtable_page_ctor(page)) {
58 		__free_page(page);
59 		return NULL;
60 	}
61 	return page;
62 
63 }
64 
65 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
66 {
67 	pmd_val(*pmd) = __pa((unsigned long)pte);
68 }
69 
70 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
71 {
72 	pmd_val(*pmd) = __pa((unsigned long)page_address(page));
73 }
74 #define pmd_pgtable(pmd) pmd_page(pmd)
75 
76 /*
77  * allocating and freeing a pmd is trivial: the 1-entry pmd is
78  * inside the pgd, so has no extra memory associated with it.
79  */
80 #define pmd_free(mm, x)			do { } while (0)
81 #define __pmd_free_tlb(tlb, x, addr)	do { } while (0)
82 
83 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
84 {
85         free_page((unsigned long) pgd);
86 }
87 
88 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
89 {
90      pgd_t *new_pgd;
91 
92      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
93      memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
94      memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
95      return new_pgd;
96 }
97 
98 #define pgd_populate(mm, pmd, pte) BUG()
99 
100 #endif /* SUN3_PGALLOC_H */
101