1 #ifndef __ASM_SH_PGALLOC_H
2 #define __ASM_SH_PGALLOC_H
4 #include <asm/processor.h>
5 #include <linux/threads.h>
6 #include <linux/slab.h>
9 #define pgd_quicklist ((unsigned long *)0)
10 #define pmd_quicklist ((unsigned long *)0)
11 #define pte_quicklist ((unsigned long *)0)
12 #define pgtable_cache_size 0L
14 #define pmd_populate_kernel(mm, pmd, pte) \
15 set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))
17 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
20 set_pmd(pmd, __pmd(_PAGE_TABLE + page_to_phys(pte)));
24 * Allocate and free page tables.
26 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
28 unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t));
29 pgd_t *pgd = (pgd_t *)kmalloc(pgd_size, GFP_KERNEL);
32 memset(pgd, 0, pgd_size);
37 static inline void pgd_free(pgd_t *pgd)
42 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
43 unsigned long address)
47 pte = (pte_t *) __get_free_page(GFP_KERNEL | __GFP_REPEAT);
54 static inline struct page *pte_alloc_one(struct mm_struct *mm,
55 unsigned long address)
59 pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
61 clear_page(page_address(pte));
66 static inline void pte_free_kernel(pte_t *pte)
68 free_page((unsigned long)pte);
71 static inline void pte_free(struct page *pte)
76 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
79 * allocating and freeing a pmd is trivial: the 1-entry pmd is
80 * inside the pgd, so has no extra memory associated with it.
83 #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
84 #define pmd_free(x) do { } while (0)
85 #define __pmd_free_tlb(tlb,x) do { } while (0)
86 #define pgd_populate(mm, pmd, pte) BUG()
88 #if defined(CONFIG_CPU_SH4)
89 #define PG_mapped PG_arch_1
92 * For SH-4, we have our own implementation for ptep_get_and_clear
94 static inline pte_t ptep_get_and_clear(pte_t *ptep)
99 if (!pte_not_present(pte)) {
100 unsigned long pfn = pte_pfn(pte);
101 if (pfn_valid(pfn)) {
102 struct page *page = pfn_to_page(pfn);
103 struct address_space *mapping = page_mapping(page);
104 if (!mapping || !mapping_writably_mapped(mapping))
105 __clear_bit(PG_mapped, &page->flags);
111 static inline pte_t ptep_get_and_clear(pte_t *ptep)
120 * Following functions are same as generic ones.
122 static inline int ptep_test_and_clear_young(pte_t *ptep)
127 set_pte(ptep, pte_mkold(pte));
131 static inline int ptep_test_and_clear_dirty(pte_t *ptep)
136 set_pte(ptep, pte_mkclean(pte));
140 static inline void ptep_set_wrprotect(pte_t *ptep)
142 pte_t old_pte = *ptep;
143 set_pte(ptep, pte_wrprotect(old_pte));
146 static inline void ptep_mkdirty(pte_t *ptep)
148 pte_t old_pte = *ptep;
149 set_pte(ptep, pte_mkdirty(old_pte));
152 #define check_pgt_cache() do { } while (0)
154 #endif /* __ASM_SH_PGALLOC_H */