1 #ifndef _ASM_POWERPC_PGALLOC_32_H
2 #define _ASM_POWERPC_PGALLOC_32_H
3 
4 #include <linux/threads.h>
5 
6 /* For 32-bit, all levels of page tables are just drawn from get_free_page() */
7 #define MAX_PGTABLE_INDEX_SIZE	0
8 
9 extern void __bad_pte(pmd_t *pmd);
10 
11 extern pgd_t *pgd_alloc(struct mm_struct *mm);
12 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
13 
14 /*
15  * We don't have any real pmd's, and this code never triggers because
16  * the pgd will always be present..
17  */
18 /* #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); }) */
19 #define pmd_free(mm, x) 		do { } while (0)
20 #define __pmd_free_tlb(tlb,x,a)		do { } while (0)
21 /* #define pgd_populate(mm, pmd, pte)      BUG() */
22 
23 #ifndef CONFIG_BOOKE
24 
25 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
26 				       pte_t *pte)
27 {
28 	*pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
29 }
30 
31 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
32 				pgtable_t pte_page)
33 {
34 	*pmdp = __pmd((page_to_pfn(pte_page) << PAGE_SHIFT) | _PMD_PRESENT);
35 }
36 
37 #define pmd_pgtable(pmd) pmd_page(pmd)
38 #else
39 
40 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
41 				       pte_t *pte)
42 {
43 	*pmdp = __pmd((unsigned long)pte | _PMD_PRESENT);
44 }
45 
46 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
47 				pgtable_t pte_page)
48 {
49 	*pmdp = __pmd((unsigned long)lowmem_page_address(pte_page) | _PMD_PRESENT);
50 }
51 
52 #define pmd_pgtable(pmd) pmd_page(pmd)
53 #endif
54 
55 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
56 extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
57 
58 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
59 {
60 	free_page((unsigned long)pte);
61 }
62 
63 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
64 {
65 	pgtable_page_dtor(ptepage);
66 	__free_page(ptepage);
67 }
68 
69 static inline void pgtable_free(void *table, unsigned index_size)
70 {
71 	BUG_ON(index_size); /* 32-bit doesn't use this */
72 	free_page((unsigned long)table);
73 }
74 
75 #define check_pgt_cache()	do { } while (0)
76 
77 #ifdef CONFIG_SMP
78 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
79 				    void *table, int shift)
80 {
81 	unsigned long pgf = (unsigned long)table;
82 	BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
83 	pgf |= shift;
84 	tlb_remove_table(tlb, (void *)pgf);
85 }
86 
87 static inline void __tlb_remove_table(void *_table)
88 {
89 	void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
90 	unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
91 
92 	pgtable_free(table, shift);
93 }
94 #else
95 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
96 				    void *table, int shift)
97 {
98 	pgtable_free(table, shift);
99 }
100 #endif
101 
102 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
103 				  unsigned long address)
104 {
105 	tlb_flush_pgtable(tlb, address);
106 	pgtable_page_dtor(table);
107 	pgtable_free_tlb(tlb, page_address(table), 0);
108 }
109 #endif /* _ASM_POWERPC_PGALLOC_32_H */
110