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