2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1994 - 2001 by Ralf Baechle at alii
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
10 #define _ASM_PGALLOC_H
12 #include <linux/config.h>
16 * - flush_tlb_all() flushes all processes TLB entries
17 * - flush_tlb_mm(mm) flushes the specified mm context TLB entries
18 * - flush_tlb_page(mm, vmaddr) flushes a single page
19 * - flush_tlb_range(mm, start, end) flushes a range of pages
20 * - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
22 extern void local_flush_tlb_all(void);
23 extern void local_flush_tlb_mm(struct mm_struct *mm);
24 extern void local_flush_tlb_range(struct mm_struct *mm, unsigned long start,
26 extern void local_flush_tlb_page(struct vm_area_struct *vma,
31 extern void flush_tlb_all(void);
32 extern void flush_tlb_mm(struct mm_struct *);
33 extern void flush_tlb_range(struct mm_struct *, unsigned long, unsigned long);
34 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
36 #else /* CONFIG_SMP */
38 #define flush_tlb_all() local_flush_tlb_all()
39 #define flush_tlb_mm(mm) local_flush_tlb_mm(mm)
40 #define flush_tlb_range(mm,vmaddr,end) local_flush_tlb_range(mm, vmaddr, end)
41 #define flush_tlb_page(vma,page) local_flush_tlb_page(vma, page)
43 #endif /* CONFIG_SMP */
45 static inline void flush_tlb_pgtables(struct mm_struct *mm,
46 unsigned long start, unsigned long end)
48 /* Nothing to do on MIPS. */
53 * Allocate and free page tables.
56 #define pgd_quicklist (current_cpu_data.pgd_quick)
57 #define pmd_quicklist (current_cpu_data.pmd_quick)
58 #define pte_quicklist (current_cpu_data.pte_quick)
59 #define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)
61 #define pmd_populate(mm, pmd, pte) pmd_set(pmd, pte)
62 #define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd)
64 extern pgd_t *get_pgd_slow(void);
66 static inline pgd_t *get_pgd_fast(void)
70 if((ret = pgd_quicklist) != NULL) {
71 pgd_quicklist = (unsigned long *)(*ret);
77 ret = (unsigned long *) get_pgd_slow();
81 static inline void free_pgd_fast(pgd_t *pgd)
83 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
84 pgd_quicklist = (unsigned long *) pgd;
88 static inline void free_pgd_slow(pgd_t *pgd)
90 free_pages((unsigned long)pgd, 1);
93 static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address)
97 pte = (pte_t *) __get_free_page(GFP_KERNEL);
103 static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
107 if ((ret = (unsigned long *)pte_quicklist) != NULL) {
108 pte_quicklist = (unsigned long *)(*ret);
110 pgtable_cache_size--;
115 extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
117 static inline pte_t *get_pte_fast(void)
121 if((ret = (unsigned long *)pte_quicklist) != NULL) {
122 pte_quicklist = (unsigned long *)(*ret);
124 pgtable_cache_size--;
129 static inline void free_pte_fast(pte_t *pte)
131 *(unsigned long *)pte = (unsigned long) pte_quicklist;
132 pte_quicklist = (unsigned long *) pte;
133 pgtable_cache_size++;
136 static inline void free_pte_slow(pte_t *pte)
138 free_pages((unsigned long)pte, 0);
141 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
145 pmd = (pmd_t *) __get_free_pages(GFP_KERNEL, 1);
147 pmd_init((unsigned long)pmd, (unsigned long)invalid_pte_table);
151 static inline pmd_t *pmd_alloc_one_fast(struct mm_struct *mm, unsigned long address)
155 if ((ret = (unsigned long *)pmd_quicklist) != NULL) {
156 pmd_quicklist = (unsigned long *)(*ret);
158 pgtable_cache_size--;
163 extern pmd_t *get_pmd_slow(pgd_t *pgd, unsigned long address_preadjusted);
165 static inline pmd_t *get_pmd_fast(void)
169 if ((ret = (unsigned long *)pmd_quicklist) != NULL) {
170 pmd_quicklist = (unsigned long *)(*ret);
172 pgtable_cache_size--;
179 static inline void free_pmd_fast(pmd_t *pmd)
181 *(unsigned long *)pmd = (unsigned long) pmd_quicklist;
182 pmd_quicklist = (unsigned long *) pmd;
183 pgtable_cache_size++;
186 static inline void free_pmd_slow(pmd_t *pmd)
188 free_pages((unsigned long)pmd, 1);
191 #define pte_free(pte) free_pte_fast(pte)
192 #define pmd_free(pte) free_pmd_fast(pte)
193 #define pgd_free(pgd) free_pgd_fast(pgd)
194 #define pgd_alloc(mm) get_pgd_fast()
196 extern pte_t kptbl[(PAGE_SIZE << PGD_ORDER)/sizeof(pte_t)];
197 extern pmd_t kpmdtbl[PTRS_PER_PMD];
199 extern int do_check_pgt_cache(int, int);
201 #endif /* _ASM_PGALLOC_H */