1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * s390x page table definitions and functions 4 * 5 * Copyright (c) 2017 Red Hat Inc 6 * 7 * Authors: 8 * David Hildenbrand <david@redhat.com> 9 */ 10 #ifndef _ASMS390X_PGTABLE_H_ 11 #define _ASMS390X_PGTABLE_H_ 12 13 #include <asm/page.h> 14 #include <alloc_page.h> 15 16 #define ASCE_ORIGIN 0xfffffffffffff000UL 17 #define ASCE_G 0x0000000000000200UL 18 #define ASCE_P 0x0000000000000100UL 19 #define ASCE_S 0x0000000000000080UL 20 #define ASCE_X 0x0000000000000040UL 21 #define ASCE_R 0x0000000000000020UL 22 #define ASCE_DT 0x000000000000000cUL 23 #define ASCE_TL 0x0000000000000003UL 24 25 #define ASCE_DT_REGION1 0x000000000000000cUL 26 #define ASCE_DT_REGION2 0x0000000000000008UL 27 #define ASCE_DT_REGION3 0x0000000000000004UL 28 #define ASCE_DT_SEGMENT 0x0000000000000000UL 29 30 #define REGION_TABLE_ORDER 2 31 #define REGION_TABLE_ENTRIES 2048 32 #define REGION_TABLE_LENGTH 3 33 34 #define REGION1_SHIFT 53 35 #define REGION2_SHIFT 42 36 #define REGION3_SHIFT 31 37 38 #define REGION_ENTRY_ORIGIN 0xfffffffffffff000UL 39 #define REGION_ENTRY_P 0x0000000000000200UL 40 #define REGION_ENTRY_TF 0x00000000000000c0UL 41 #define REGION_ENTRY_I 0x0000000000000020UL 42 #define REGION_ENTRY_TT 0x000000000000000cUL 43 #define REGION_ENTRY_TL 0x0000000000000003UL 44 45 #define REGION_ENTRY_TT_REGION1 0x000000000000000cUL 46 #define REGION_ENTRY_TT_REGION2 0x0000000000000008UL 47 #define REGION_ENTRY_TT_REGION3 0x0000000000000004UL 48 49 #define REGION3_ENTRY_RFAA 0xffffffff80000000UL 50 #define REGION3_ENTRY_AV 0x0000000000010000UL 51 #define REGION3_ENTRY_ACC 0x000000000000f000UL 52 #define REGION3_ENTRY_F 0x0000000000000800UL 53 #define REGION3_ENTRY_FC 0x0000000000000400UL 54 #define REGION3_ENTRY_IEP 0x0000000000000100UL 55 #define REGION3_ENTRY_CR 0x0000000000000010UL 56 57 #define SEGMENT_TABLE_ORDER 2 58 #define SEGMENT_TABLE_ENTRIES 2048 59 #define SEGMENT_TABLE_LENGTH 3 60 #define SEGMENT_SHIFT 20 61 62 #define SEGMENT_ENTRY_ORIGIN 0xfffffffffffff800UL 63 #define SEGMENT_ENTRY_SFAA 0xfffffffffff00000UL 64 #define SEGMENT_ENTRY_AV 0x0000000000010000UL 65 #define SEGMENT_ENTRY_ACC 0x000000000000f000UL 66 #define SEGMENT_ENTRY_F 0x0000000000000800UL 67 #define SEGMENT_ENTRY_FC 0x0000000000000400UL 68 #define SEGMENT_ENTRY_P 0x0000000000000200UL 69 #define SEGMENT_ENTRY_IEP 0x0000000000000100UL 70 #define SEGMENT_ENTRY_I 0x0000000000000020UL 71 #define SEGMENT_ENTRY_CS 0x0000000000000010UL 72 #define SEGMENT_ENTRY_TT 0x000000000000000cUL 73 74 #define SEGMENT_ENTRY_TT_REGION1 0x000000000000000cUL 75 #define SEGMENT_ENTRY_TT_REGION2 0x0000000000000008UL 76 #define SEGMENT_ENTRY_TT_REGION3 0x0000000000000004UL 77 #define SEGMENT_ENTRY_TT_SEGMENT 0x0000000000000000UL 78 79 #define PAGE_TABLE_ORDER 0 80 #define PAGE_TABLE_ENTRIES 256 81 82 #define PAGE_ENTRY_I 0x0000000000000400UL 83 #define PAGE_ENTRY_P 0x0000000000000200UL 84 #define PAGE_ENTRY_IEP 0x0000000000000100UL 85 86 #define PTRS_PER_PGD REGION_TABLE_ENTRIES 87 #define PTRS_PER_P4D REGION_TABLE_ENTRIES 88 #define PTRS_PER_PUD REGION_TABLE_ENTRIES 89 #define PTRS_PER_PMD SEGMENT_TABLE_ENTRIES 90 #define PTRS_PER_PTE PAGE_TABLE_ENTRIES 91 92 #define PGDIR_SHIFT REGION1_SHIFT 93 #define P4D_SHIFT REGION2_SHIFT 94 #define PUD_SHIFT REGION3_SHIFT 95 #define PMD_SHIFT SEGMENT_SHIFT 96 97 #define pgd_none(entry) (pgd_val(entry) & REGION_ENTRY_I) 98 #define p4d_none(entry) (p4d_val(entry) & REGION_ENTRY_I) 99 #define pud_none(entry) (pud_val(entry) & REGION_ENTRY_I) 100 #define pmd_none(entry) (pmd_val(entry) & SEGMENT_ENTRY_I) 101 #define pte_none(entry) (pte_val(entry) & PAGE_ENTRY_I) 102 103 #define pgd_addr(entry) __va(pgd_val(entry) & REGION_ENTRY_ORIGIN) 104 #define p4d_addr(entry) __va(p4d_val(entry) & REGION_ENTRY_ORIGIN) 105 #define pud_addr(entry) __va(pud_val(entry) & REGION_ENTRY_ORIGIN) 106 #define pmd_addr(entry) __va(pmd_val(entry) & SEGMENT_ENTRY_ORIGIN) 107 #define pte_addr(entry) __va(pte_val(entry) & PAGE_MASK) 108 109 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 110 #define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1)) 111 #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) 112 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) 113 #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) 114 115 #define pgd_offset(table, addr) ((pgd_t *)(table) + pgd_index(addr)) 116 #define p4d_offset(pgd, addr) ((p4d_t *)pgd_addr(*(pgd)) + p4d_index(addr)) 117 #define pud_offset(p4d, addr) ((pud_t *)p4d_addr(*(p4d)) + pud_index(addr)) 118 #define pmd_offset(pud, addr) ((pmd_t *)pud_addr(*(pud)) + pmd_index(addr)) 119 #define pte_offset(pmd, addr) ((pte_t *)pmd_addr(*(pmd)) + pte_index(addr)) 120 121 static inline pgd_t *pgd_alloc_one(void) 122 { 123 pgd_t *pgd = alloc_pages(REGION_TABLE_ORDER); 124 int i; 125 126 for (i = 0; i < REGION_TABLE_ENTRIES; i++) 127 pgd_val(pgd[i]) = REGION_ENTRY_TT_REGION1 | REGION_ENTRY_I; 128 return pgd; 129 } 130 131 static inline p4d_t *p4d_alloc_one(void) 132 { 133 p4d_t *p4d = alloc_pages(REGION_TABLE_ORDER); 134 int i; 135 136 for (i = 0; i < REGION_TABLE_ENTRIES; i++) 137 p4d_val(p4d[i]) = REGION_ENTRY_TT_REGION2 | REGION_ENTRY_I; 138 return p4d; 139 } 140 141 static inline p4d_t *p4d_alloc(pgd_t *pgd, unsigned long addr) 142 { 143 if (pgd_none(*pgd)) { 144 p4d_t *p4d = p4d_alloc_one(); 145 pgd_val(*pgd) = __pa(p4d) | REGION_ENTRY_TT_REGION1 | 146 REGION_ENTRY_TL; 147 } 148 return p4d_offset(pgd, addr); 149 } 150 151 static inline pud_t *pud_alloc_one(void) 152 { 153 pud_t *pud = alloc_pages(REGION_TABLE_ORDER); 154 int i; 155 156 for (i = 0; i < REGION_TABLE_ENTRIES; i++) 157 pud_val(pud[i]) = REGION_ENTRY_TT_REGION3 | REGION_ENTRY_I; 158 return pud; 159 } 160 161 static inline pud_t *pud_alloc(p4d_t *p4d, unsigned long addr) 162 { 163 if (p4d_none(*p4d)) { 164 pud_t *pud = pud_alloc_one(); 165 p4d_val(*p4d) = __pa(pud) | REGION_ENTRY_TT_REGION2 | 166 REGION_ENTRY_TL; 167 } 168 return pud_offset(p4d, addr); 169 } 170 171 static inline pmd_t *pmd_alloc_one(void) 172 { 173 pmd_t *pmd = alloc_pages(SEGMENT_TABLE_ORDER); 174 int i; 175 176 for (i = 0; i < SEGMENT_TABLE_ENTRIES; i++) 177 pmd_val(pmd[i]) = SEGMENT_ENTRY_TT_SEGMENT | SEGMENT_ENTRY_I; 178 return pmd; 179 } 180 181 static inline pmd_t *pmd_alloc(pud_t *pud, unsigned long addr) 182 { 183 if (pud_none(*pud)) { 184 pmd_t *pmd = pmd_alloc_one(); 185 pud_val(*pud) = __pa(pmd) | REGION_ENTRY_TT_REGION3 | 186 REGION_ENTRY_TL; 187 } 188 return pmd_offset(pud, addr); 189 } 190 191 static inline pte_t *pte_alloc_one(void) 192 { 193 pte_t *pte = alloc_pages(PAGE_TABLE_ORDER); 194 int i; 195 196 for (i = 0; i < PAGE_TABLE_ENTRIES; i++) 197 pte_val(pte[i]) = PAGE_ENTRY_I; 198 return pte; 199 } 200 201 static inline pte_t *pte_alloc(pmd_t *pmd, unsigned long addr) 202 { 203 if (pmd_none(*pmd)) { 204 pte_t *pte = pte_alloc_one(); 205 pmd_val(*pmd) = __pa(pte) | SEGMENT_ENTRY_TT_SEGMENT; 206 } 207 return pte_offset(pmd, addr); 208 } 209 210 static inline void ipte(unsigned long vaddr, pteval_t *p_pte) 211 { 212 unsigned long table_origin = (unsigned long)p_pte; 213 214 asm volatile( 215 " ipte %0,%1\n" 216 : : "a" (table_origin), "a" (vaddr) : "memory"); 217 } 218 219 void configure_dat(int enable); 220 221 #endif /* _ASMS390X_PGTABLE_H_ */ 222