1 /* 2 * S390 version 3 * Copyright IBM Corp. 1999, 2000 4 * Author(s): Hartmut Penner (hp@de.ibm.com) 5 * Martin Schwidefsky (schwidefsky@de.ibm.com) 6 * 7 * Derived from "include/asm-i386/pgalloc.h" 8 * Copyright (C) 1994 Linus Torvalds 9 */ 10 11 #ifndef _S390_PGALLOC_H 12 #define _S390_PGALLOC_H 13 14 #include <linux/threads.h> 15 #include <linux/gfp.h> 16 #include <linux/mm.h> 17 18 unsigned long *crst_table_alloc(struct mm_struct *); 19 void crst_table_free(struct mm_struct *, unsigned long *); 20 21 unsigned long *page_table_alloc(struct mm_struct *); 22 struct page *page_table_alloc_pgste(struct mm_struct *mm); 23 void page_table_free(struct mm_struct *, unsigned long *); 24 void page_table_free_rcu(struct mmu_gather *, unsigned long *, unsigned long); 25 void page_table_free_pgste(struct page *page); 26 extern int page_table_allocate_pgste; 27 28 static inline void clear_table(unsigned long *s, unsigned long val, size_t n) 29 { 30 typedef struct { char _[n]; } addrtype; 31 32 *s = val; 33 n = (n / 256) - 1; 34 asm volatile( 35 " mvc 8(248,%0),0(%0)\n" 36 "0: mvc 256(256,%0),0(%0)\n" 37 " la %0,256(%0)\n" 38 " brct %1,0b\n" 39 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s) 40 : "m" (*(addrtype *) s)); 41 } 42 43 static inline void crst_table_init(unsigned long *crst, unsigned long entry) 44 { 45 clear_table(crst, entry, sizeof(unsigned long)*2048); 46 } 47 48 static inline unsigned long pgd_entry_type(struct mm_struct *mm) 49 { 50 if (mm->context.asce_limit <= (1UL << 31)) 51 return _SEGMENT_ENTRY_EMPTY; 52 if (mm->context.asce_limit <= (1UL << 42)) 53 return _REGION3_ENTRY_EMPTY; 54 return _REGION2_ENTRY_EMPTY; 55 } 56 57 int crst_table_upgrade(struct mm_struct *); 58 void crst_table_downgrade(struct mm_struct *); 59 60 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) 61 { 62 unsigned long *table = crst_table_alloc(mm); 63 if (table) 64 crst_table_init(table, _REGION3_ENTRY_EMPTY); 65 return (pud_t *) table; 66 } 67 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud) 68 69 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) 70 { 71 unsigned long *table = crst_table_alloc(mm); 72 73 if (!table) 74 return NULL; 75 crst_table_init(table, _SEGMENT_ENTRY_EMPTY); 76 if (!pgtable_pmd_page_ctor(virt_to_page(table))) { 77 crst_table_free(mm, table); 78 return NULL; 79 } 80 return (pmd_t *) table; 81 } 82 83 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 84 { 85 pgtable_pmd_page_dtor(virt_to_page(pmd)); 86 crst_table_free(mm, (unsigned long *) pmd); 87 } 88 89 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) 90 { 91 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud); 92 } 93 94 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 95 { 96 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); 97 } 98 99 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 100 { 101 unsigned long *table = crst_table_alloc(mm); 102 103 if (!table) 104 return NULL; 105 if (mm->context.asce_limit == (1UL << 31)) { 106 /* Forking a compat process with 2 page table levels */ 107 if (!pgtable_pmd_page_ctor(virt_to_page(table))) { 108 crst_table_free(mm, table); 109 return NULL; 110 } 111 } 112 return (pgd_t *) table; 113 } 114 115 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 116 { 117 if (mm->context.asce_limit == (1UL << 31)) 118 pgtable_pmd_page_dtor(virt_to_page(pgd)); 119 crst_table_free(mm, (unsigned long *) pgd); 120 } 121 122 static inline void pmd_populate(struct mm_struct *mm, 123 pmd_t *pmd, pgtable_t pte) 124 { 125 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); 126 } 127 128 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) 129 130 #define pmd_pgtable(pmd) \ 131 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE) 132 133 /* 134 * page table entry allocation/free routines. 135 */ 136 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) 137 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm)) 138 139 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) 140 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) 141 142 extern void rcu_table_freelist_finish(void); 143 144 #endif /* _S390_PGALLOC_H */ 145