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) 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 register void *reg2 asm ("2") = to; 59 register unsigned long reg3 asm ("3") = 0x1000; 60 register void *reg4 asm ("4") = from; 61 register unsigned long reg5 asm ("5") = 0xb0001000; 62 asm volatile( 63 " mvcl 2,4" 64 : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5) 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 __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 72 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr) 73 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 74 75 /* 76 * These are used to make use of C type-checking.. 77 */ 78 79 typedef struct { unsigned long pgprot; } pgprot_t; 80 typedef struct { unsigned long pgste; } pgste_t; 81 typedef struct { unsigned long pte; } pte_t; 82 typedef struct { unsigned long pmd; } pmd_t; 83 typedef struct { unsigned long pud; } pud_t; 84 typedef struct { unsigned long p4d; } p4d_t; 85 typedef struct { unsigned long pgd; } pgd_t; 86 typedef pte_t *pgtable_t; 87 88 #define pgprot_val(x) ((x).pgprot) 89 #define pgste_val(x) ((x).pgste) 90 #define pte_val(x) ((x).pte) 91 #define pmd_val(x) ((x).pmd) 92 #define pud_val(x) ((x).pud) 93 #define p4d_val(x) ((x).p4d) 94 #define pgd_val(x) ((x).pgd) 95 96 #define __pgste(x) ((pgste_t) { (x) } ) 97 #define __pte(x) ((pte_t) { (x) } ) 98 #define __pmd(x) ((pmd_t) { (x) } ) 99 #define __pud(x) ((pud_t) { (x) } ) 100 #define __p4d(x) ((p4d_t) { (x) } ) 101 #define __pgd(x) ((pgd_t) { (x) } ) 102 #define __pgprot(x) ((pgprot_t) { (x) } ) 103 104 static inline void page_set_storage_key(unsigned long addr, 105 unsigned char skey, int mapped) 106 { 107 if (!mapped) 108 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 109 : : "d" (skey), "a" (addr)); 110 else 111 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 112 } 113 114 static inline unsigned char page_get_storage_key(unsigned long addr) 115 { 116 unsigned char skey; 117 118 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 119 return skey; 120 } 121 122 static inline int page_reset_referenced(unsigned long addr) 123 { 124 int cc; 125 126 asm volatile( 127 " rrbe 0,%1\n" 128 " ipm %0\n" 129 " srl %0,28\n" 130 : "=d" (cc) : "a" (addr) : "cc"); 131 return cc; 132 } 133 134 /* Bits int the storage key */ 135 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 136 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 137 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 138 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 139 140 struct page; 141 void arch_free_page(struct page *page, int order); 142 void arch_alloc_page(struct page *page, int order); 143 void arch_set_page_dat(struct page *page, int order); 144 void arch_set_page_nodat(struct page *page, int order); 145 int arch_test_page_nodat(struct page *page); 146 void arch_set_page_states(int make_stable); 147 148 static inline int devmem_is_allowed(unsigned long pfn) 149 { 150 return 0; 151 } 152 153 #define HAVE_ARCH_FREE_PAGE 154 #define HAVE_ARCH_ALLOC_PAGE 155 156 #endif /* !__ASSEMBLY__ */ 157 158 #define __PAGE_OFFSET 0x0UL 159 #define PAGE_OFFSET 0x0UL 160 161 #define __pa(x) ((unsigned long)(x)) 162 #define __va(x) ((void *)(unsigned long)(x)) 163 164 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) 165 #define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) 166 #define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 167 168 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 169 #define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 170 171 #define phys_to_pfn(kaddr) ((kaddr) >> PAGE_SHIFT) 172 #define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 173 174 #define phys_to_page(kaddr) pfn_to_page(phys_to_pfn(kaddr)) 175 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 176 177 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 178 179 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 180 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 181 182 #include <asm-generic/memory_model.h> 183 #include <asm-generic/getorder.h> 184 185 #endif /* _S390_PAGE_H */ 186