1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * S390 version 4 * Copyright IBM Corp. 1999, 2000 5 * Author(s): Hartmut Penner (hp@de.ibm.com) 6 */ 7 8 #ifndef _S390_PAGE_H 9 #define _S390_PAGE_H 10 11 #include <linux/const.h> 12 #include <asm/types.h> 13 #include <asm/asm.h> 14 15 #include <vdso/page.h> 16 17 #define PAGE_DEFAULT_ACC _AC(0, UL) 18 /* storage-protection override */ 19 #define PAGE_SPO_ACC 9 20 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 21 22 #define HPAGE_SHIFT 20 23 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 24 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 25 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 26 #define HUGE_MAX_HSTATE 2 27 28 #define ARCH_HAS_SETCLEAR_HUGE_PTE 29 #define ARCH_HAS_HUGE_PTE_TYPE 30 #define ARCH_HAS_PREPARE_HUGEPAGE 31 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH 32 33 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 34 35 #include <asm/setup.h> 36 #ifndef __ASSEMBLY__ 37 38 void __storage_key_init_range(unsigned long start, unsigned long end); 39 40 static inline void storage_key_init_range(unsigned long start, unsigned long end) 41 { 42 if (PAGE_DEFAULT_KEY != 0) 43 __storage_key_init_range(start, end); 44 } 45 46 #define clear_page(page) memset((page), 0, PAGE_SIZE) 47 48 /* 49 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to 50 * bypass caches when copying a page. Especially when copying huge pages 51 * this keeps L1 and L2 data caches alive. 52 */ 53 static inline void copy_page(void *to, void *from) 54 { 55 union register_pair dst, src; 56 57 dst.even = (unsigned long) to; 58 dst.odd = 0x1000; 59 src.even = (unsigned long) from; 60 src.odd = 0xb0001000; 61 62 asm volatile( 63 " mvcl %[dst],%[src]" 64 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair) 65 : : "memory", "cc"); 66 } 67 68 #define clear_user_page(page, vaddr, pg) clear_page(page) 69 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 70 71 #define vma_alloc_zeroed_movable_folio(vma, vaddr) \ 72 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr) 73 74 #ifdef CONFIG_STRICT_MM_TYPECHECKS 75 #define STRICT_MM_TYPECHECKS 76 #endif 77 78 #ifdef STRICT_MM_TYPECHECKS 79 80 typedef struct { unsigned long pgprot; } pgprot_t; 81 typedef struct { unsigned long pgste; } pgste_t; 82 typedef struct { unsigned long pte; } pte_t; 83 typedef struct { unsigned long pmd; } pmd_t; 84 typedef struct { unsigned long pud; } pud_t; 85 typedef struct { unsigned long p4d; } p4d_t; 86 typedef struct { unsigned long pgd; } pgd_t; 87 88 #define DEFINE_PGVAL_FUNC(name) \ 89 static __always_inline unsigned long name ## _val(name ## _t name) \ 90 { \ 91 return name.name; \ 92 } 93 94 #else /* STRICT_MM_TYPECHECKS */ 95 96 typedef unsigned long pgprot_t; 97 typedef unsigned long pgste_t; 98 typedef unsigned long pte_t; 99 typedef unsigned long pmd_t; 100 typedef unsigned long pud_t; 101 typedef unsigned long p4d_t; 102 typedef unsigned long pgd_t; 103 104 #define DEFINE_PGVAL_FUNC(name) \ 105 static __always_inline unsigned long name ## _val(name ## _t name) \ 106 { \ 107 return name; \ 108 } 109 110 #endif /* STRICT_MM_TYPECHECKS */ 111 112 DEFINE_PGVAL_FUNC(pgprot) 113 DEFINE_PGVAL_FUNC(pgste) 114 DEFINE_PGVAL_FUNC(pte) 115 DEFINE_PGVAL_FUNC(pmd) 116 DEFINE_PGVAL_FUNC(pud) 117 DEFINE_PGVAL_FUNC(p4d) 118 DEFINE_PGVAL_FUNC(pgd) 119 120 typedef pte_t *pgtable_t; 121 122 #define __pgprot(x) ((pgprot_t) { (x) } ) 123 #define __pgste(x) ((pgste_t) { (x) } ) 124 #define __pte(x) ((pte_t) { (x) } ) 125 #define __pmd(x) ((pmd_t) { (x) } ) 126 #define __pud(x) ((pud_t) { (x) } ) 127 #define __p4d(x) ((p4d_t) { (x) } ) 128 #define __pgd(x) ((pgd_t) { (x) } ) 129 130 static inline void page_set_storage_key(unsigned long addr, 131 unsigned char skey, int mapped) 132 { 133 if (!mapped) 134 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 135 : : "d" (skey), "a" (addr)); 136 else 137 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 138 } 139 140 static inline unsigned char page_get_storage_key(unsigned long addr) 141 { 142 unsigned char skey; 143 144 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 145 return skey; 146 } 147 148 static inline int page_reset_referenced(unsigned long addr) 149 { 150 int cc; 151 152 asm volatile( 153 " rrbe 0,%[addr]\n" 154 CC_IPM(cc) 155 : CC_OUT(cc, cc) 156 : [addr] "a" (addr) 157 : CC_CLOBBER); 158 return CC_TRANSFORM(cc); 159 } 160 161 /* Bits int the storage key */ 162 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 163 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 164 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 165 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 166 167 struct page; 168 struct folio; 169 void arch_free_page(struct page *page, int order); 170 void arch_alloc_page(struct page *page, int order); 171 172 static inline int devmem_is_allowed(unsigned long pfn) 173 { 174 return 0; 175 } 176 177 #define HAVE_ARCH_FREE_PAGE 178 #define HAVE_ARCH_ALLOC_PAGE 179 180 int arch_make_folio_accessible(struct folio *folio); 181 #define HAVE_ARCH_MAKE_FOLIO_ACCESSIBLE 182 183 struct vm_layout { 184 unsigned long kaslr_offset; 185 unsigned long kaslr_offset_phys; 186 unsigned long identity_base; 187 unsigned long identity_size; 188 }; 189 190 extern struct vm_layout vm_layout; 191 192 #define __kaslr_offset vm_layout.kaslr_offset 193 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys 194 #ifdef CONFIG_RANDOMIZE_IDENTITY_BASE 195 #define __identity_base vm_layout.identity_base 196 #else 197 #define __identity_base 0UL 198 #endif 199 #define ident_map_size vm_layout.identity_size 200 201 static inline unsigned long kaslr_offset(void) 202 { 203 return __kaslr_offset; 204 } 205 206 extern int __kaslr_enabled; 207 static inline int kaslr_enabled(void) 208 { 209 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) 210 return __kaslr_enabled; 211 return 0; 212 } 213 214 #define __PAGE_OFFSET __identity_base 215 #define PAGE_OFFSET __PAGE_OFFSET 216 217 #ifdef __DECOMPRESSOR 218 219 #define __pa_nodebug(x) ((unsigned long)(x)) 220 #define __pa(x) __pa_nodebug(x) 221 #define __pa32(x) __pa(x) 222 #define __va(x) ((void *)(unsigned long)(x)) 223 224 #else /* __DECOMPRESSOR */ 225 226 static inline unsigned long __pa_nodebug(unsigned long x) 227 { 228 if (x < __kaslr_offset) 229 return x - __identity_base; 230 return x - __kaslr_offset + __kaslr_offset_phys; 231 } 232 233 #ifdef CONFIG_DEBUG_VIRTUAL 234 235 unsigned long __phys_addr(unsigned long x, bool is_31bit); 236 237 #else /* CONFIG_DEBUG_VIRTUAL */ 238 239 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit) 240 { 241 return __pa_nodebug(x); 242 } 243 244 #endif /* CONFIG_DEBUG_VIRTUAL */ 245 246 #define __pa(x) __phys_addr((unsigned long)(x), false) 247 #define __pa32(x) __phys_addr((unsigned long)(x), true) 248 #define __va(x) ((void *)((unsigned long)(x) + __identity_base)) 249 250 #endif /* __DECOMPRESSOR */ 251 252 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT) 253 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 254 255 #define phys_to_folio(phys) page_folio(phys_to_page(phys)) 256 #define folio_to_phys(page) pfn_to_phys(folio_pfn(folio)) 257 258 static inline void *pfn_to_virt(unsigned long pfn) 259 { 260 return __va(pfn_to_phys(pfn)); 261 } 262 263 static inline unsigned long virt_to_pfn(const void *kaddr) 264 { 265 return phys_to_pfn(__pa(kaddr)); 266 } 267 268 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 269 270 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 271 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 272 273 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr)))) 274 275 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 276 277 #endif /* !__ASSEMBLY__ */ 278 279 #include <asm-generic/memory_model.h> 280 #include <asm-generic/getorder.h> 281 282 #define AMODE31_SIZE (3 * PAGE_SIZE) 283 284 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024) 285 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE 286 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE) 287 288 #define TEXT_OFFSET 0x100000 289 290 #endif /* _S390_PAGE_H */ 291