Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __ASM_SH64_PGALLOC_H |
| 2 | #define __ASM_SH64_PGALLOC_H |
| 3 | |
| 4 | /* |
| 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 |
| 7 | * for more details. |
| 8 | * |
| 9 | * include/asm-sh64/pgalloc.h |
| 10 | * |
| 11 | * Copyright (C) 2000, 2001 Paolo Alberelli |
| 12 | * Copyright (C) 2003, 2004 Paul Mundt |
| 13 | * Copyright (C) 2003, 2004 Richard Curnow |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/threads.h> |
| 18 | #include <linux/mm.h> |
| 19 | |
| 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) |
| 24 | |
| 25 | static inline void pgd_init(unsigned long page) |
| 26 | { |
| 27 | unsigned long *pgd = (unsigned long *)page; |
| 28 | extern pte_t empty_bad_pte_table[PTRS_PER_PTE]; |
| 29 | int i; |
| 30 | |
| 31 | for (i = 0; i < USER_PTRS_PER_PGD; i++) |
| 32 | pgd[i] = (unsigned long)empty_bad_pte_table; |
| 33 | } |
| 34 | |
| 35 | /* |
| 36 | * Allocate and free page tables. The xxx_kernel() versions are |
| 37 | * used to allocate a kernel page table - this turns on ASN bits |
| 38 | * if any. |
| 39 | */ |
| 40 | |
Adrian Bunk | ca5ed2f | 2006-01-09 20:54:47 -0800 | [diff] [blame^] | 41 | static inline pgd_t *get_pgd_slow(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | { |
| 43 | unsigned int pgd_size = (USER_PTRS_PER_PGD * sizeof(pgd_t)); |
| 44 | pgd_t *ret = (pgd_t *)kmalloc(pgd_size, GFP_KERNEL); |
| 45 | return ret; |
| 46 | } |
| 47 | |
Adrian Bunk | ca5ed2f | 2006-01-09 20:54:47 -0800 | [diff] [blame^] | 48 | static inline pgd_t *get_pgd_fast(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
| 50 | unsigned long *ret; |
| 51 | |
| 52 | if ((ret = pgd_quicklist) != NULL) { |
| 53 | pgd_quicklist = (unsigned long *)(*ret); |
| 54 | ret[0] = 0; |
| 55 | pgtable_cache_size--; |
| 56 | } else |
| 57 | ret = (unsigned long *)get_pgd_slow(); |
| 58 | |
| 59 | if (ret) { |
| 60 | memset(ret, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); |
| 61 | } |
| 62 | return (pgd_t *)ret; |
| 63 | } |
| 64 | |
Adrian Bunk | ca5ed2f | 2006-01-09 20:54:47 -0800 | [diff] [blame^] | 65 | static inline void free_pgd_fast(pgd_t *pgd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
| 67 | *(unsigned long *)pgd = (unsigned long) pgd_quicklist; |
| 68 | pgd_quicklist = (unsigned long *) pgd; |
| 69 | pgtable_cache_size++; |
| 70 | } |
| 71 | |
Adrian Bunk | ca5ed2f | 2006-01-09 20:54:47 -0800 | [diff] [blame^] | 72 | static inline void free_pgd_slow(pgd_t *pgd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | { |
| 74 | kfree((void *)pgd); |
| 75 | } |
| 76 | |
| 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); |
| 79 | |
Adrian Bunk | ca5ed2f | 2006-01-09 20:54:47 -0800 | [diff] [blame^] | 80 | static inline pte_t *get_pte_fast(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
| 82 | unsigned long *ret; |
| 83 | |
| 84 | if((ret = (unsigned long *)pte_quicklist) != NULL) { |
| 85 | pte_quicklist = (unsigned long *)(*ret); |
| 86 | ret[0] = ret[1]; |
| 87 | pgtable_cache_size--; |
| 88 | } |
| 89 | return (pte_t *)ret; |
| 90 | } |
| 91 | |
Adrian Bunk | ca5ed2f | 2006-01-09 20:54:47 -0800 | [diff] [blame^] | 92 | static inline void free_pte_fast(pte_t *pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
| 94 | *(unsigned long *)pte = (unsigned long) pte_quicklist; |
| 95 | pte_quicklist = (unsigned long *) pte; |
| 96 | pgtable_cache_size++; |
| 97 | } |
| 98 | |
| 99 | static inline void pte_free_kernel(pte_t *pte) |
| 100 | { |
| 101 | free_page((unsigned long)pte); |
| 102 | } |
| 103 | |
| 104 | static inline void pte_free(struct page *pte) |
| 105 | { |
| 106 | __free_page(pte); |
| 107 | } |
| 108 | |
| 109 | static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, |
| 110 | unsigned long address) |
| 111 | { |
| 112 | pte_t *pte; |
| 113 | |
| 114 | pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT|__GFP_ZERO); |
| 115 | |
| 116 | return pte; |
| 117 | } |
| 118 | |
| 119 | static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address) |
| 120 | { |
| 121 | struct page *pte; |
| 122 | |
| 123 | pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0); |
| 124 | |
| 125 | return pte; |
| 126 | } |
| 127 | |
| 128 | #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte)) |
| 129 | |
| 130 | /* |
| 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. |
| 133 | */ |
| 134 | |
| 135 | #if defined(CONFIG_SH64_PGTABLE_2_LEVEL) |
| 136 | |
| 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) |
| 142 | |
| 143 | #elif defined(CONFIG_SH64_PGTABLE_3_LEVEL) |
| 144 | |
| 145 | static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) |
| 146 | { |
| 147 | pmd_t *pmd; |
| 148 | pmd = (pmd_t *) __get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO); |
| 149 | return pmd; |
| 150 | } |
| 151 | |
| 152 | static __inline__ void pmd_free(pmd_t *pmd) |
| 153 | { |
| 154 | free_page((unsigned long) pmd); |
| 155 | } |
| 156 | |
| 157 | #define pgd_populate(mm, pgd, pmd) pgd_set(pgd, pmd) |
| 158 | #define __pmd_free_tlb(tlb,pmd) pmd_free(pmd) |
| 159 | |
| 160 | #else |
| 161 | #error "No defined page table size" |
| 162 | #endif |
| 163 | |
| 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() |
| 167 | |
| 168 | extern int do_check_pgt_cache(int, int); |
| 169 | |
Adrian Bunk | ca5ed2f | 2006-01-09 20:54:47 -0800 | [diff] [blame^] | 170 | static inline void set_pgdir(unsigned long address, pgd_t entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
| 172 | struct task_struct * p; |
| 173 | pgd_t *pgd; |
| 174 | |
| 175 | read_lock(&tasklist_lock); |
| 176 | for_each_process(p) { |
| 177 | if (!p->mm) |
| 178 | continue; |
| 179 | *pgd_offset(p->mm,address) = entry; |
| 180 | } |
| 181 | read_unlock(&tasklist_lock); |
| 182 | for (pgd = (pgd_t *)pgd_quicklist; pgd; pgd = (pgd_t *)*(unsigned long *)pgd) |
| 183 | pgd[address >> PGDIR_SHIFT] = entry; |
| 184 | } |
| 185 | |
| 186 | #define pmd_populate_kernel(mm, pmd, pte) \ |
| 187 | set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) (pte))) |
| 188 | |
| 189 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, |
| 190 | struct page *pte) |
| 191 | { |
| 192 | set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) page_address (pte))); |
| 193 | } |
| 194 | |
| 195 | #endif /* __ASM_SH64_PGALLOC_H */ |