1 /* 2 * include/asm-s390/pgalloc.h 3 * 4 * S390 version 5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Hartmut Penner (hp@de.ibm.com) 7 * Martin Schwidefsky (schwidefsky@de.ibm.com) 8 * 9 * Derived from "include/asm-i386/pgalloc.h" 10 * Copyright (C) 1994 Linus Torvalds 11 */ 12 13 #ifndef _S390_PGALLOC_H 14 #define _S390_PGALLOC_H 15 16 #include <linux/threads.h> 17 #include <linux/gfp.h> 18 #include <linux/mm.h> 19 20 unsigned long *crst_table_alloc(struct mm_struct *); 21 void crst_table_free(struct mm_struct *, unsigned long *); 22 23 unsigned long *page_table_alloc(struct mm_struct *, unsigned long); 24 void page_table_free(struct mm_struct *, unsigned long *); 25 void page_table_free_rcu(struct mmu_gather *, unsigned long *); 26 27 static inline void clear_table(unsigned long *s, unsigned long val, size_t n) 28 { 29 typedef struct { char _[n]; } addrtype; 30 31 *s = val; 32 n = (n / 256) - 1; 33 asm volatile( 34 #ifdef CONFIG_64BIT 35 " mvc 8(248,%0),0(%0)\n" 36 #else 37 " mvc 4(252,%0),0(%0)\n" 38 #endif 39 "0: mvc 256(256,%0),0(%0)\n" 40 " la %0,256(%0)\n" 41 " brct %1,0b\n" 42 : "+a" (s), "+d" (n), "=m" (*(addrtype *) s) 43 : "m" (*(addrtype *) s)); 44 } 45 46 static inline void crst_table_init(unsigned long *crst, unsigned long entry) 47 { 48 clear_table(crst, entry, sizeof(unsigned long)*2048); 49 } 50 51 #ifndef __s390x__ 52 53 static inline unsigned long pgd_entry_type(struct mm_struct *mm) 54 { 55 return _SEGMENT_ENTRY_EMPTY; 56 } 57 58 #define pud_alloc_one(mm,address) ({ BUG(); ((pud_t *)2); }) 59 #define pud_free(mm, x) do { } while (0) 60 61 #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) 62 #define pmd_free(mm, x) do { } while (0) 63 64 #define pgd_populate(mm, pgd, pud) BUG() 65 #define pud_populate(mm, pud, pmd) BUG() 66 67 #else /* __s390x__ */ 68 69 static inline unsigned long pgd_entry_type(struct mm_struct *mm) 70 { 71 if (mm->context.asce_limit <= (1UL << 31)) 72 return _SEGMENT_ENTRY_EMPTY; 73 if (mm->context.asce_limit <= (1UL << 42)) 74 return _REGION3_ENTRY_EMPTY; 75 return _REGION2_ENTRY_EMPTY; 76 } 77 78 int crst_table_upgrade(struct mm_struct *, unsigned long limit); 79 void crst_table_downgrade(struct mm_struct *, unsigned long limit); 80 81 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) 82 { 83 unsigned long *table = crst_table_alloc(mm); 84 if (table) 85 crst_table_init(table, _REGION3_ENTRY_EMPTY); 86 return (pud_t *) table; 87 } 88 #define pud_free(mm, pud) crst_table_free(mm, (unsigned long *) pud) 89 90 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long vmaddr) 91 { 92 unsigned long *table = crst_table_alloc(mm); 93 if (table) 94 crst_table_init(table, _SEGMENT_ENTRY_EMPTY); 95 return (pmd_t *) table; 96 } 97 #define pmd_free(mm, pmd) crst_table_free(mm, (unsigned long *) pmd) 98 99 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) 100 { 101 pgd_val(*pgd) = _REGION2_ENTRY | __pa(pud); 102 } 103 104 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 105 { 106 pud_val(*pud) = _REGION3_ENTRY | __pa(pmd); 107 } 108 109 #endif /* __s390x__ */ 110 111 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 112 { 113 spin_lock_init(&mm->context.list_lock); 114 INIT_LIST_HEAD(&mm->context.pgtable_list); 115 INIT_LIST_HEAD(&mm->context.gmap_list); 116 return (pgd_t *) crst_table_alloc(mm); 117 } 118 #define pgd_free(mm, pgd) crst_table_free(mm, (unsigned long *) pgd) 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, vmaddr)) 135 #define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm, vmaddr)) 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