blob: f868506e3350b0075799a30cc0e42206e7e21212 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* sun3_pgalloc.h --
2 * reorganization around 2.3.39, routines moved from sun3_pgtable.h
3 *
4 *
5 * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
6 *
7 * moved 1/26/2000 Sam Creasey
8 */
9
10#ifndef _SUN3_PGALLOC_H
11#define _SUN3_PGALLOC_H
12
13#include <asm/tlb.h>
14
15/* FIXME - when we get this compiling */
16/* erm, now that it's compiling, what do we do with it? */
17#define _KERNPG_TABLE 0
18
19extern const char bad_pmd_string[];
20
21#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
22
23
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -080024static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025{
26 free_page((unsigned long) pte);
27}
28
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080029static inline void pte_free(struct mm_struct *mm, pgtable_t page)
Linus Torvalds1da177e2005-04-16 15:20:36 -070030{
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080031 pgtable_page_dtor(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 __free_page(page);
33}
34
Benjamin Herrenschmidt9e1b32c2009-07-22 15:44:28 +100035#define __pte_free_tlb(tlb,pte,addr) \
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080036do { \
37 pgtable_page_dtor(pte); \
38 tlb_remove_page((tlb), pte); \
39} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
42 unsigned long address)
43{
44 unsigned long page = __get_free_page(GFP_KERNEL|__GFP_REPEAT);
45
46 if (!page)
47 return NULL;
48
49 memset((void *)page, 0, PAGE_SIZE);
50 return (pte_t *) (page);
51}
52
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080053static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
54 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
56 struct page *page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
57
58 if (page == NULL)
59 return NULL;
60
61 clear_highpage(page);
Kirill A. Shutemovf84c9142013-11-14 14:31:34 -080062 if (!pgtable_page_ctor(page)) {
63 __free_page(page);
64 return NULL;
65 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 return page;
67
68}
69
70static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
71{
72 pmd_val(*pmd) = __pa((unsigned long)pte);
73}
74
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080075static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
77 pmd_val(*pmd) = __pa((unsigned long)page_address(page));
78}
Martin Schwidefsky2f569af2008-02-08 04:22:04 -080079#define pmd_pgtable(pmd) pmd_page(pmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81/*
82 * allocating and freeing a pmd is trivial: the 1-entry pmd is
83 * inside the pgd, so has no extra memory associated with it.
84 */
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -080085#define pmd_free(mm, x) do { } while (0)
Benjamin Herrenschmidt9e1b32c2009-07-22 15:44:28 +100086#define __pmd_free_tlb(tlb, x, addr) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Benjamin Herrenschmidt5e541972008-02-04 22:29:14 -080088static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
90 free_page((unsigned long) pgd);
91}
92
93static inline pgd_t * pgd_alloc(struct mm_struct *mm)
94{
95 pgd_t *new_pgd;
96
97 new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
98 memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
99 memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
100 return new_pgd;
101}
102
103#define pgd_populate(mm, pmd, pte) BUG()
104
105#endif /* SUN3_PGALLOC_H */