1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Copyright IBM Corp. 1999, 2000
5 * Author(s): Hartmut Penner (hp@de.ibm.com)
11 #include <linux/const.h>
12 #include <asm/types.h>
14 #define _PAGE_SHIFT CONFIG_PAGE_SHIFT
15 #define _PAGE_SIZE (_AC(1, UL) << _PAGE_SHIFT)
16 #define _PAGE_MASK (~(_PAGE_SIZE - 1))
18 /* PAGE_SHIFT determines the page size */
19 #define PAGE_SHIFT _PAGE_SHIFT
20 #define PAGE_SIZE _PAGE_SIZE
21 #define PAGE_MASK _PAGE_MASK
22 #define PAGE_DEFAULT_ACC _AC(0, UL)
23 /* storage-protection override */
24 #define PAGE_SPO_ACC 9
25 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
27 #define HPAGE_SHIFT 20
28 #define HPAGE_SIZE (1UL << HPAGE_SHIFT)
29 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
30 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
31 #define HUGE_MAX_HSTATE 2
33 #define ARCH_HAS_SETCLEAR_HUGE_PTE
34 #define ARCH_HAS_HUGE_PTE_TYPE
35 #define ARCH_HAS_PREPARE_HUGEPAGE
36 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH
38 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
40 #include <asm/setup.h>
43 void __storage_key_init_range(unsigned long start, unsigned long end);
45 static inline void storage_key_init_range(unsigned long start, unsigned long end)
47 if (PAGE_DEFAULT_KEY != 0)
48 __storage_key_init_range(start, end);
51 #define clear_page(page) memset((page), 0, PAGE_SIZE)
54 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to
55 * bypass caches when copying a page. Especially when copying huge pages
56 * this keeps L1 and L2 data caches alive.
58 static inline void copy_page(void *to, void *from)
60 union register_pair dst, src;
62 dst.even = (unsigned long) to;
64 src.even = (unsigned long) from;
69 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair)
73 #define clear_user_page(page, vaddr, pg) clear_page(page)
74 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
76 #define vma_alloc_zeroed_movable_folio(vma, vaddr) \
77 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false)
80 * These are used to make use of C type-checking..
83 typedef struct { unsigned long pgprot; } pgprot_t;
84 typedef struct { unsigned long pgste; } pgste_t;
85 typedef struct { unsigned long pte; } pte_t;
86 typedef struct { unsigned long pmd; } pmd_t;
87 typedef struct { unsigned long pud; } pud_t;
88 typedef struct { unsigned long p4d; } p4d_t;
89 typedef struct { unsigned long pgd; } pgd_t;
90 typedef pte_t *pgtable_t;
92 #define pgprot_val(x) ((x).pgprot)
93 #define pgste_val(x) ((x).pgste)
95 static inline unsigned long pte_val(pte_t pte)
100 static inline unsigned long pmd_val(pmd_t pmd)
105 static inline unsigned long pud_val(pud_t pud)
110 static inline unsigned long p4d_val(p4d_t p4d)
115 static inline unsigned long pgd_val(pgd_t pgd)
120 #define __pgste(x) ((pgste_t) { (x) } )
121 #define __pte(x) ((pte_t) { (x) } )
122 #define __pmd(x) ((pmd_t) { (x) } )
123 #define __pud(x) ((pud_t) { (x) } )
124 #define __p4d(x) ((p4d_t) { (x) } )
125 #define __pgd(x) ((pgd_t) { (x) } )
126 #define __pgprot(x) ((pgprot_t) { (x) } )
128 static inline void page_set_storage_key(unsigned long addr,
129 unsigned char skey, int mapped)
132 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0"
133 : : "d" (skey), "a" (addr));
135 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr));
138 static inline unsigned char page_get_storage_key(unsigned long addr)
142 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr));
146 static inline int page_reset_referenced(unsigned long addr)
154 : "=d" (cc) : "a" (addr) : "cc");
158 /* Bits int the storage key */
159 #define _PAGE_CHANGED 0x02 /* HW changed bit */
160 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */
161 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */
162 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */
165 void arch_free_page(struct page *page, int order);
166 void arch_alloc_page(struct page *page, int order);
168 static inline int devmem_is_allowed(unsigned long pfn)
173 #define HAVE_ARCH_FREE_PAGE
174 #define HAVE_ARCH_ALLOC_PAGE
176 #if IS_ENABLED(CONFIG_PGSTE)
177 int arch_make_page_accessible(struct page *page);
178 #define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
182 unsigned long kaslr_offset;
183 unsigned long kaslr_offset_phys;
184 unsigned long identity_base;
185 unsigned long identity_size;
188 extern struct vm_layout vm_layout;
190 #define __kaslr_offset vm_layout.kaslr_offset
191 #define __kaslr_offset_phys vm_layout.kaslr_offset_phys
192 #define __identity_base vm_layout.identity_base
193 #define ident_map_size vm_layout.identity_size
195 static inline unsigned long kaslr_offset(void)
197 return __kaslr_offset;
200 extern int __kaslr_enabled;
201 static inline int kaslr_enabled(void)
203 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE))
204 return __kaslr_enabled;
208 #define __PAGE_OFFSET __identity_base
209 #define PAGE_OFFSET __PAGE_OFFSET
211 #ifdef __DECOMPRESSOR
213 #define __pa_nodebug(x) ((unsigned long)(x))
214 #define __pa(x) __pa_nodebug(x)
215 #define __pa32(x) __pa(x)
216 #define __va(x) ((void *)(unsigned long)(x))
218 #else /* __DECOMPRESSOR */
220 static inline unsigned long __pa_nodebug(unsigned long x)
222 if (x < __kaslr_offset)
223 return x - __identity_base;
224 return x - __kaslr_offset + __kaslr_offset_phys;
227 #ifdef CONFIG_DEBUG_VIRTUAL
229 unsigned long __phys_addr(unsigned long x, bool is_31bit);
231 #else /* CONFIG_DEBUG_VIRTUAL */
233 static inline unsigned long __phys_addr(unsigned long x, bool is_31bit)
235 return __pa_nodebug(x);
238 #endif /* CONFIG_DEBUG_VIRTUAL */
240 #define __pa(x) __phys_addr((unsigned long)(x), false)
241 #define __pa32(x) __phys_addr((unsigned long)(x), true)
242 #define __va(x) ((void *)((unsigned long)(x) + __identity_base))
244 #endif /* __DECOMPRESSOR */
246 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT)
247 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
249 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
250 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
252 static inline void *pfn_to_virt(unsigned long pfn)
254 return __va(pfn_to_phys(pfn));
257 static inline unsigned long virt_to_pfn(const void *kaddr)
259 return phys_to_pfn(__pa(kaddr));
262 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn)
264 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
265 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
267 #define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug((unsigned long)(kaddr))))
269 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
271 #endif /* !__ASSEMBLY__ */
273 #include <asm-generic/memory_model.h>
274 #include <asm-generic/getorder.h>
276 #define AMODE31_SIZE (3 * PAGE_SIZE)
278 #define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
279 #define __START_KERNEL 0x100000
280 #define __NO_KASLR_START_KERNEL CONFIG_KERNEL_IMAGE_BASE
281 #define __NO_KASLR_END_KERNEL (__NO_KASLR_START_KERNEL + KERNEL_IMAGE_SIZE)
283 #endif /* _S390_PAGE_H */