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 *, unsigned long); 22 void page_table_free(struct mm_struct *, unsigned long *); 23 void page_table_free_rcu(struct mmu_gather *, unsigned long *); 24 25 void page_table_reset_pgste(struct mm_struct *, unsigned long, unsigned long, 26 bool init_skey); 27 int set_guest_storage_key(struct mm_struct *mm, unsigned long addr, 28 unsigned long key, bool nq); 29 30 static inline void clear_table(unsigned long *s, unsigned long val, size_t n) 31 { 32 typedef struct { char _[n]; } addrtype; 33 34 *s = val; 35 n = (n / 256) - 1; 36 asm volatile( 37 #ifdef CONFIG_64BIT 38 " mvc 8(248,%0),0(%0)\n" 39 #else 40 " mvc 4(252,%0),0(%0)\n" 41 #endif 42 "0: mvc 256(256,%0),0(%0)\n" 43 " la %0,256(%0)\n" 44 " brct %1,0b\n" 45 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s) 46 : "m" (*(addrtype *) s)); 47 } 48 49 static inline void crst_table_init(unsigned long *crst, unsigned long entry) 50 { 51 clear_table(crst, entry, sizeof(unsigned long)*2048); 52 } 53 54 #ifndef CONFIG_64BIT 55 56 static inline unsigned long pgd_entry_type(struct mm_struct *mm) 57 { 58 return _SEGMENT_ENTRY_EMPTY; 59 } 60 61 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); }) 62 #define pud_free(mm, x) do { } while (0) 63 64 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) 65 #define pmd_free(mm, x) do { } while (0) 66 67 #define pgd_populate(mm, pgd, pud) BUG() 68 #define pud_populate(mm, pud, pmd) BUG() 69 70 #else /* CONFIG_64BIT */ 71 72 static inline unsigned long pgd_entry_type(struct mm_struct *mm) 73 { 74 if (mm->context.asce_limit <= (1UL << 31)) 75 return _SEGMENT_ENTRY_EMPTY; 76 if (mm->context.asce_limit <= (1UL << 42)) 77 return _REGION3_ENTRY_EMPTY; 78 return _REGION2_ENTRY_EMPTY; 79 } 80 81 int crst_table_upgrade(struct mm_struct *, unsigned long limit); 82 void crst_table_downgrade(struct mm_struct *, unsigned long limit); 83 84 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) 85 { 86 unsigned long *table = crst_table_alloc(mm); 87 if (table) 88 crst_table_init(table, _REGION3_ENTRY_EMPTY); 89 return (pud_t *) table; 90 } 91 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud) 92 93 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) 94 { 95 unsigned long *table = crst_table_alloc(mm); 96 97 if (!table) 98 return NULL; 99 crst_table_init(table, _SEGMENT_ENTRY_EMPTY); 100 if (!pgtable_pmd_page_ctor(virt_to_page(table))) { 101 crst_table_free(mm, table); 102 return NULL; 103 } 104 return (pmd_t *) table; 105 } 106 107 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 108 { 109 pgtable_pmd_page_dtor(virt_to_page(pmd)); 110 crst_table_free(mm, (unsigned long *) pmd); 111 } 112 113 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) 114 { 115 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud); 116 } 117 118 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 119 { 120 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); 121 } 122 123 #endif /* CONFIG_64BIT */ 124 125 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 126 { 127 spin_lock_init(&mm->context.list_lock); 128 INIT_LIST_HEAD(&mm->context.pgtable_list); 129 INIT_LIST_HEAD(&mm->context.gmap_list); 130 return (pgd_t *) crst_table_alloc(mm); 131 } 132 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd) 133 134 static inline void pmd_populate(struct mm_struct *mm, 135 pmd_t *pmd, pgtable_t pte) 136 { 137 pmd_val(*pmd) = _SEGMENT_ENTRY + __pa(pte); 138 } 139 140 #define pmd_populate_kernel(mm, pmd, pte) pmd_populate(mm, pmd, pte) 141 142 #define pmd_pgtable(pmd) \ 143 (pgtable_t)(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE) 144 145 /* 146 * page table entry allocation/free routines. 147 */ 148 #define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr)) 149 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr)) 150 151 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte) 152 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte) 153 154 extern void rcu_table_freelist_finish(void); 155 156 #endif /* _S390_PGALLOC_H */ 157