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
9extern void __bad_pte(pmd_t *pmd);
10
11extern pgd_t *pgd_alloc(struct mm_struct *mm);
12extern 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#define pmd_populate_kernel(mm, pmd, pte)	\
25		(pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
26#define pmd_populate(mm, pmd, pte)	\
27		(pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) | _PMD_PRESENT)
28#define pmd_pgtable(pmd) pmd_page(pmd)
29#else
30#define pmd_populate_kernel(mm, pmd, pte)	\
31		(pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
32#define pmd_populate(mm, pmd, pte)	\
33		(pmd_val(*(pmd)) = (unsigned long)lowmem_page_address(pte) | _PMD_PRESENT)
34#define pmd_pgtable(pmd) pmd_page(pmd)
35#endif
36
37extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
38extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
39
40static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
41{
42	free_page((unsigned long)pte);
43}
44
45static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
46{
47	pgtable_page_dtor(ptepage);
48	__free_page(ptepage);
49}
50
51static inline void pgtable_free(void *table, unsigned index_size)
52{
53	BUG_ON(index_size); /* 32-bit doesn't use this */
54	free_page((unsigned long)table);
55}
56
57#define check_pgt_cache()	do { } while (0)
58
59#ifdef CONFIG_SMP
60static inline void pgtable_free_tlb(struct mmu_gather *tlb,
61				    void *table, int shift)
62{
63	unsigned long pgf = (unsigned long)table;
64	BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
65	pgf |= shift;
66	tlb_remove_table(tlb, (void *)pgf);
67}
68
69static inline void __tlb_remove_table(void *_table)
70{
71	void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
72	unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
73
74	pgtable_free(table, shift);
75}
76#else
77static inline void pgtable_free_tlb(struct mmu_gather *tlb,
78				    void *table, int shift)
79{
80	pgtable_free(table, shift);
81}
82#endif
83
84static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
85				  unsigned long address)
86{
87	tlb_flush_pgtable(tlb, address);
88	pgtable_page_dtor(table);
89	pgtable_free_tlb(tlb, page_address(table), 0);
90}
91#endif /* _ASM_POWERPC_PGALLOC_32_H */
92