1 #ifndef __ASM_SH64_PGALLOC_H
2 #define __ASM_SH64_PGALLOC_H
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
9 * include/asm-sh64/pgalloc.h
11 * Copyright (C) 2000, 2001 Paolo Alberelli
12 * Copyright (C) 2003, 2004 Paul Mundt
13 * Copyright (C) 2003, 2004 Richard Curnow
17 #include <linux/threads.h>
20 #define pgd_quicklist (current_cpu_data.pgd_quick)
21 #define pmd_quicklist (current_cpu_data.pmd_quick)
22 #define pte_quicklist (current_cpu_data.pte_quick)
23 #define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)
25 static inline void pgd_init(unsigned long page)
27 unsigned long *pgd = (unsigned long *)page;
28 extern pte_t empty_bad_pte_table[PTRS_PER_PTE];
31 for (i = 0; i < USER_PTRS_PER_PGD; i++)
32 pgd[i] = (unsigned long)empty_bad_pte_table;
36 * Allocate and free page tables. The xxx_kernel() versions are
37 * used to allocate a kernel page table - this turns on ASN bits
41 static inline pgd_t *get_pgd_slow(void)
43 unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t));
44 pgd_t *ret = kmalloc(pgd_size, GFP_KERNEL);
48 static inline pgd_t *get_pgd_fast(void)
52 if ((ret = pgd_quicklist) != NULL) {
53 pgd_quicklist = (unsigned long *)(*ret);
57 ret = (unsigned long *)get_pgd_slow();
60 memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
65 static inline void free_pgd_fast(pgd_t *pgd)
67 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
68 pgd_quicklist = (unsigned long *) pgd;
72 static inline void free_pgd_slow(pgd_t *pgd)
77 extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
78 extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long address_preadjusted);
80 static inline pte_t *get_pte_fast(void)
84 if((ret = (unsigned long *)pte_quicklist) != NULL) {
85 pte_quicklist = (unsigned long *)(*ret);
92 static inline void free_pte_fast(pte_t *pte)
94 *(unsigned long *)pte = (unsigned long) pte_quicklist;
95 pte_quicklist = (unsigned long *) pte;
99 static inline void pte_free_kernel(pte_t *pte)
101 free_page((unsigned long)pte);
104 static inline void pte_free(struct page *pte)
109 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
110 unsigned long address)
114 pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT|__GFP_ZERO);
119 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
123 pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
128 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
131 * allocating and freeing a pmd is trivial: the 1-entry pmd is
132 * inside the pgd, so has no extra memory associated with it.
135 #if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
137 #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
138 #define pmd_free(x) do { } while (0)
139 #define pgd_populate(mm, pmd, pte) BUG()
140 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
141 #define __pmd_free_tlb(tlb,pmd) do { } while (0)
143 #elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
145 static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
148 pmd = (pmd_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
152 static __inline__ void pmd_free(pmd_t *pmd)
154 free_page((unsigned long) pmd);
157 #define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd)
158 #define __pmd_free_tlb(tlb,pmd) pmd_free(pmd)
161 #error "No defined page table size"
164 #define check_pgt_cache() do { } while (0)
165 #define pgd_free(pgd) free_pgd_slow(pgd)
166 #define pgd_alloc(mm) get_pgd_fast()
168 extern int do_check_pgt_cache(int, int);
170 #define pmd_populate_kernel(mm, pmd, pte) \
171 set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) (pte)))
173 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
176 set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) page_address (pte)));
179 #endif /* __ASM_SH64_PGALLOC_H */