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