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