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