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