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 14 #define _PAGE_SHIFT 12 15 #define _PAGE_SIZE (_AC(1, UL) << _PAGE_SHIFT) 16 #define _PAGE_MASK (~(_PAGE_SIZE - 1)) 17 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 0 23 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 24 25 #define HPAGE_SHIFT 20 26 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 27 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 28 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 29 #define HUGE_MAX_HSTATE 2 30 31 #define ARCH_HAS_SETCLEAR_HUGE_PTE 32 #define ARCH_HAS_HUGE_PTE_TYPE 33 #define ARCH_HAS_PREPARE_HUGEPAGE 34 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH 35 36 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 37 38 #include <asm/setup.h> 39 #ifndef __ASSEMBLY__ 40 41 void __storage_key_init_range(unsigned long start, unsigned long end); 42 43 static inline void storage_key_init_range(unsigned long start, unsigned long end) 44 { 45 if (PAGE_DEFAULT_KEY != 0) 46 __storage_key_init_range(start, end); 47 } 48 49 #define clear_page(page) memset((page), 0, PAGE_SIZE) 50 51 /* 52 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to 53 * bypass caches when copying a page. Especially when copying huge pages 54 * this keeps L1 and L2 data caches alive. 55 */ 56 static inline void copy_page(void *to, void *from) 57 { 58 union register_pair dst, src; 59 60 dst.even = (unsigned long) to; 61 dst.odd = 0x1000; 62 src.even = (unsigned long) from; 63 src.odd = 0xb0001000; 64 65 asm volatile( 66 " mvcl %[dst],%[src]" 67 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair) 68 : : "memory", "cc"); 69 } 70 71 #define clear_user_page(page, vaddr, pg) clear_page(page) 72 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 73 74 #define alloc_zeroed_user_highpage_movable(vma, vaddr) \ 75 alloc_page_vma(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, vma, vaddr) 76 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE_MOVABLE 77 78 /* 79 * These are used to make use of C type-checking.. 80 */ 81 82 typedef struct { unsigned long pgprot; } pgprot_t; 83 typedef struct { unsigned long pgste; } pgste_t; 84 typedef struct { unsigned long pte; } pte_t; 85 typedef struct { unsigned long pmd; } pmd_t; 86 typedef struct { unsigned long pud; } pud_t; 87 typedef struct { unsigned long p4d; } p4d_t; 88 typedef struct { unsigned long pgd; } pgd_t; 89 typedef pte_t *pgtable_t; 90 91 #define pgprot_val(x) ((x).pgprot) 92 #define pgste_val(x) ((x).pgste) 93 #define pte_val(x) ((x).pte) 94 #define pmd_val(x) ((x).pmd) 95 #define pud_val(x) ((x).pud) 96 #define p4d_val(x) ((x).p4d) 97 #define pgd_val(x) ((x).pgd) 98 99 #define __pgste(x) ((pgste_t) { (x) } ) 100 #define __pte(x) ((pte_t) { (x) } ) 101 #define __pmd(x) ((pmd_t) { (x) } ) 102 #define __pud(x) ((pud_t) { (x) } ) 103 #define __p4d(x) ((p4d_t) { (x) } ) 104 #define __pgd(x) ((pgd_t) { (x) } ) 105 #define __pgprot(x) ((pgprot_t) { (x) } ) 106 107 static inline void page_set_storage_key(unsigned long addr, 108 unsigned char skey, int mapped) 109 { 110 if (!mapped) 111 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 112 : : "d" (skey), "a" (addr)); 113 else 114 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 115 } 116 117 static inline unsigned char page_get_storage_key(unsigned long addr) 118 { 119 unsigned char skey; 120 121 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 122 return skey; 123 } 124 125 static inline int page_reset_referenced(unsigned long addr) 126 { 127 int cc; 128 129 asm volatile( 130 " rrbe 0,%1\n" 131 " ipm %0\n" 132 " srl %0,28\n" 133 : "=d" (cc) : "a" (addr) : "cc"); 134 return cc; 135 } 136 137 /* Bits int the storage key */ 138 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 139 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 140 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 141 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 142 143 struct page; 144 void arch_free_page(struct page *page, int order); 145 void arch_alloc_page(struct page *page, int order); 146 void arch_set_page_dat(struct page *page, int order); 147 void arch_set_page_nodat(struct page *page, int order); 148 int arch_test_page_nodat(struct page *page); 149 void arch_set_page_states(int make_stable); 150 151 static inline int devmem_is_allowed(unsigned long pfn) 152 { 153 return 0; 154 } 155 156 #define HAVE_ARCH_FREE_PAGE 157 #define HAVE_ARCH_ALLOC_PAGE 158 159 #if IS_ENABLED(CONFIG_PGSTE) 160 int arch_make_page_accessible(struct page *page); 161 #define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE 162 #endif 163 164 #endif /* !__ASSEMBLY__ */ 165 166 #define __PAGE_OFFSET 0x0UL 167 #define PAGE_OFFSET 0x0UL 168 169 #define __pa(x) ((unsigned long)(x)) 170 #define __va(x) ((void *)(unsigned long)(x)) 171 172 #define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT) 173 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 174 175 #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) 176 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) 177 178 #define pfn_to_virt(pfn) __va(pfn_to_phys(pfn)) 179 #define virt_to_pfn(kaddr) (phys_to_pfn(__pa(kaddr))) 180 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 181 182 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 183 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 184 185 #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr)) 186 187 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 188 189 #include <asm-generic/memory_model.h> 190 #include <asm-generic/getorder.h> 191 192 #endif /* _S390_PAGE_H */ 193