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
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
10 #define _ASM_PGALLOC_H
12 #include <linux/config.h>
14 #include <asm/fixmap.h>
18 * - flush_tlb_all() flushes all processes TLB entries
19 * - flush_tlb_mm(mm) flushes the specified mm context TLB entries
20 * - flush_tlb_page(mm, vmaddr) flushes a single page
21 * - flush_tlb_range(mm, start, end) flushes a range of pages
22 * - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
23 * - flush_tlb_one(page) flushes a single kernel page
25 extern void local_flush_tlb_all(void);
26 extern void local_flush_tlb_mm(struct mm_struct *mm);
27 extern void local_flush_tlb_range(struct mm_struct *mm, unsigned long start,
29 extern void local_flush_tlb_page(struct vm_area_struct *vma,
31 extern void local_flush_tlb_one(unsigned long page);
35 extern void flush_tlb_all(void);
36 extern void flush_tlb_mm(struct mm_struct *);
37 extern void flush_tlb_range(struct mm_struct *, unsigned long, unsigned long);
38 extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
40 #else /* CONFIG_SMP */
42 #define flush_tlb_all() local_flush_tlb_all()
43 #define flush_tlb_mm(mm) local_flush_tlb_mm(mm)
44 #define flush_tlb_range(mm,vmaddr,end) local_flush_tlb_range(mm, vmaddr, end)
45 #define flush_tlb_page(vma,page) local_flush_tlb_page(vma, page)
47 #endif /* CONFIG_SMP */
49 static inline void flush_tlb_pgtables(struct mm_struct *mm,
50 unsigned long start, unsigned long end)
52 /* Nothing to do on MIPS. */
57 * Allocate and free page tables.
60 #define pgd_quicklist (current_cpu_data.pgd_quick)
61 #define pmd_quicklist ((unsigned long *)0)
62 #define pte_quicklist (current_cpu_data.pte_quick)
63 #define pgtable_cache_size (current_cpu_data.pgtable_cache_sz)
65 #define pmd_populate(mm, pmd, pte) pmd_set(pmd, pte)
68 * Initialize new page directory with pointers to invalid ptes
70 extern void pgd_init(unsigned long page);
72 static __inline__ pgd_t *get_pgd_slow(void)
74 pgd_t *ret = (pgd_t *)__get_free_pages(GFP_KERNEL, PGD_ORDER), *init;
77 init = pgd_offset(&init_mm, 0);
78 pgd_init((unsigned long)ret);
79 memcpy (ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
80 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
85 static __inline__ pgd_t *get_pgd_fast(void)
89 if((ret = pgd_quicklist) != NULL) {
90 pgd_quicklist = (unsigned long *)(*ret);
94 ret = (unsigned long *)get_pgd_slow();
98 static __inline__ void free_pgd_fast(pgd_t *pgd)
100 *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
101 pgd_quicklist = (unsigned long *) pgd;
102 pgtable_cache_size++;
105 static __inline__ void free_pgd_slow(pgd_t *pgd)
107 free_pages((unsigned long)pgd, PGD_ORDER);
110 static __inline__ pte_t *get_pte_fast(void)
114 if((ret = (unsigned long *)pte_quicklist) != NULL) {
115 pte_quicklist = (unsigned long *)(*ret);
117 pgtable_cache_size--;
122 static __inline__ void free_pte_fast(pte_t *pte)
124 *(unsigned long *)pte = (unsigned long) pte_quicklist;
125 pte_quicklist = (unsigned long *) pte;
126 pgtable_cache_size++;
129 static __inline__ void free_pte_slow(pte_t *pte)
131 free_page((unsigned long)pte);
134 /* We don't use pmd cache, so these are dummy routines */
135 static __inline__ pmd_t *get_pmd_fast(void)
140 static __inline__ void free_pmd_fast(pmd_t *pmd)
144 static __inline__ void free_pmd_slow(pmd_t *pmd)
148 extern void __bad_pte(pmd_t *pmd);
150 static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address)
154 pte = (pte_t *) __get_free_page(GFP_KERNEL);
160 static inline pte_t *pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
164 if ((ret = (unsigned long *)pte_quicklist) != NULL) {
165 pte_quicklist = (unsigned long *)(*ret);
167 pgtable_cache_size--;
172 static __inline__ void pte_free_fast(pte_t *pte)
174 *(unsigned long *)pte = (unsigned long) pte_quicklist;
175 pte_quicklist = (unsigned long *) pte;
176 pgtable_cache_size++;
179 static __inline__ void pte_free_slow(pte_t *pte)
181 free_page((unsigned long)pte);
184 #define pte_free(pte) pte_free_fast(pte)
185 #define pgd_free(pgd) free_pgd_fast(pgd)
186 #define pgd_alloc(mm) get_pgd_fast()
189 * allocating and freeing a pmd is trivial: the 1-entry pmd is
190 * inside the pgd, so has no extra memory associated with it.
192 #define pmd_alloc_one_fast(mm, addr) ({ BUG(); ((pmd_t *)1); })
193 #define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
194 #define pmd_free(x) do { } while (0)
195 #define pgd_populate(mm, pmd, pte) BUG()
197 extern int do_check_pgt_cache(int, int);
199 #endif /* _ASM_PGALLOC_H */