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 <asm/processor.h>
18 #include <linux/threads.h>
21 #define pgd_quicklist (current_cpu_data.pgd_quick)
22 #define pmd_quicklist (current_cpu_data.pmd_quick)
23 #define pte_quicklist (current_cpu_data.pte_quick)
24 #define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)
26 static inline void pgd_init(unsigned long page)
28 unsigned long *pgd = (unsigned long *)page;
29 extern pte_t empty_bad_pte_table[PTRS_PER_PTE];
32 for (i = 0; i < USER_PTRS_PER_PGD; i++)
33 pgd[i] = (unsigned long)empty_bad_pte_table;
37 * Allocate and free page tables. The xxx_kernel() versions are
38 * used to allocate a kernel page table - this turns on ASN bits
42 extern __inline__ pgd_t *get_pgd_slow(void)
44 unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t));
45 pgd_t *ret = (pgd_t *)kmalloc(pgd_size, GFP_KERNEL);
49 extern __inline__ pgd_t *get_pgd_fast(void)
53 if ((ret = pgd_quicklist) != NULL) {
54 pgd_quicklist = (unsigned long *)(*ret);
58 ret = (unsigned long *)get_pgd_slow();
61 memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
66 extern __inline__ void free_pgd_fast(pgd_t *pgd)
68 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
69 pgd_quicklist = (unsigned long *) pgd;
73 extern __inline__ void free_pgd_slow(pgd_t *pgd)
78 extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
79 extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long address_preadjusted);
81 extern __inline__ pte_t *get_pte_fast(void)
85 if((ret = (unsigned long *)pte_quicklist) != NULL) {
86 pte_quicklist = (unsigned long *)(*ret);
93 extern __inline__ void free_pte_fast(pte_t *pte)
95 *(unsigned long *)pte = (unsigned long) pte_quicklist;
96 pte_quicklist = (unsigned long *) pte;
100 static inline void pte_free_kernel(pte_t *pte)
102 free_page((unsigned long)pte);
105 static inline void pte_free(struct page *pte)
110 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
111 unsigned long address)
115 pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);
122 static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
126 pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
128 clear_page(page_address(pte));
133 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
136 * allocating and freeing a pmd is trivial: the 1-entry pmd is
137 * inside the pgd, so has no extra memory associated with it.
140 #if defined(CONFIG_SH64_PGTABLE_2_LEVEL)
142 #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
143 #define pmd_free(x) do { } while (0)
144 #define pgd_populate(mm, pmd, pte) BUG()
145 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
146 #define __pmd_free_tlb(tlb,pmd) do { } while (0)
148 #elif defined(CONFIG_SH64_PGTABLE_3_LEVEL)
150 static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
153 pmd = (pmd_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
159 static __inline__ void pmd_free(pmd_t *pmd)
161 free_page((unsigned long) pmd);
164 #define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd)
165 #define __pmd_free_tlb(tlb,pmd) pmd_free(pmd)
168 #error "No defined page table size"
171 #define check_pgt_cache() do { } while (0)
172 #define pgd_free(pgd) free_pgd_slow(pgd)
173 #define pgd_alloc(mm) get_pgd_fast()
175 extern int do_check_pgt_cache(int, int);
177 extern inline void set_pgdir(unsigned long address, pgd_t entry)
179 struct task_struct * p;
182 read_lock(&tasklist_lock);
183 for_each_process(p) {
186 *pgd_offset(p->mm,address) = entry;
188 read_unlock(&tasklist_lock);
189 for (pgd = (pgd_t *)pgd_quicklist; pgd; pgd = (pgd_t *)*(unsigned long *)pgd)
190 pgd[address >> PGDIR_SHIFT] = entry;
193 #define pmd_populate_kernel(mm, pmd, pte) \
194 set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) (pte)))
196 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
199 set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) page_address (pte)));
202 #endif /* __ASM_SH64_PGALLOC_H */