1#ifndef __ASM_SH_PGALLOC_H
2#define __ASM_SH_PGALLOC_H
3
4#include <linux/quicklist.h>
5#include <asm/page.h>
6
7#define QUICK_PGD 0	/* We preserve special mappings over free */
8#define QUICK_PT 1	/* Other page table pages that are zero on free */
9
10static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
11				       pte_t *pte)
12{
13	set_pmd(pmd, __pmd((unsigned long)pte));
14}
15
16static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
17				struct page *pte)
18{
19	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
20}
21
22static inline void pgd_ctor(void *x)
23{
24	pgd_t *pgd = x;
25
26	memcpy(pgd + USER_PTRS_PER_PGD,
27	       swapper_pg_dir + USER_PTRS_PER_PGD,
28	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
29}
30
31/*
32 * Allocate and free page tables.
33 */
34static inline pgd_t *pgd_alloc(struct mm_struct *mm)
35{
36	return quicklist_alloc(QUICK_PGD, GFP_KERNEL | __GFP_REPEAT, pgd_ctor);
37}
38
39static inline void pgd_free(pgd_t *pgd)
40{
41	quicklist_free(QUICK_PGD, NULL, pgd);
42}
43
44static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
45					  unsigned long address)
46{
47	return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
48}
49
50static inline struct page *pte_alloc_one(struct mm_struct *mm,
51					 unsigned long address)
52{
53	void *pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
54	return pg ? virt_to_page(pg) : NULL;
55}
56
57static inline void pte_free_kernel(pte_t *pte)
58{
59	quicklist_free(QUICK_PT, NULL, pte);
60}
61
62static inline void pte_free(struct page *pte)
63{
64	quicklist_free_page(QUICK_PT, NULL, pte);
65}
66
67#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
68
69/*
70 * allocating and freeing a pmd is trivial: the 1-entry pmd is
71 * inside the pgd, so has no extra memory associated with it.
72 */
73
74#define pmd_free(x)			do { } while (0)
75#define __pmd_free_tlb(tlb,x)		do { } while (0)
76
77static inline void check_pgt_cache(void)
78{
79	quicklist_trim(QUICK_PGD, NULL, 25, 16);
80	quicklist_trim(QUICK_PT, NULL, 25, 16);
81}
82
83#endif /* __ASM_SH_PGALLOC_H */
84