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 CONFIG_PAGE_SHIFT 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 _AC(0, UL) 23/* storage-protection override */ 24#define PAGE_SPO_ACC 9 25#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 26 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 32 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 37 38#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 39 40#include <asm/setup.h> 41#ifndef __ASSEMBLY__ 42 43void __storage_key_init_range(unsigned long start, unsigned long end); 44 45static inline void storage_key_init_range(unsigned long start, unsigned long end) 46{ 47 if (PAGE_DEFAULT_KEY != 0) 48 __storage_key_init_range(start, end); 49} 50 51#define clear_page(page) memset((page), 0, PAGE_SIZE) 52 53/* 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. 57 */ 58static inline void copy_page(void *to, void *from) 59{ 60 union register_pair dst, src; 61 62 dst.even = (unsigned long) to; 63 dst.odd = 0x1000; 64 src.even = (unsigned long) from; 65 src.odd = 0xb0001000; 66 67 asm volatile( 68 " mvcl %[dst],%[src]" 69 : [dst] "+&d" (dst.pair), [src] "+&d" (src.pair) 70 : : "memory", "cc"); 71} 72 73#define clear_user_page(page, vaddr, pg) clear_page(page) 74#define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 75 76#define vma_alloc_zeroed_movable_folio(vma, vaddr) \ 77 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false) 78 79/* 80 * These are used to make use of C type-checking.. 81 */ 82 83typedef struct { unsigned long pgprot; } pgprot_t; 84typedef struct { unsigned long pgste; } pgste_t; 85typedef struct { unsigned long pte; } pte_t; 86typedef struct { unsigned long pmd; } pmd_t; 87typedef struct { unsigned long pud; } pud_t; 88typedef struct { unsigned long p4d; } p4d_t; 89typedef struct { unsigned long pgd; } pgd_t; 90typedef pte_t *pgtable_t; 91 92#define pgprot_val(x) ((x).pgprot) 93#define pgste_val(x) ((x).pgste) 94 95static inline unsigned long pte_val(pte_t pte) 96{ 97 return pte.pte; 98} 99 100static inline unsigned long pmd_val(pmd_t pmd) 101{ 102 return pmd.pmd; 103} 104 105static inline unsigned long pud_val(pud_t pud) 106{ 107 return pud.pud; 108} 109 110static inline unsigned long p4d_val(p4d_t p4d) 111{ 112 return p4d.p4d; 113} 114 115static inline unsigned long pgd_val(pgd_t pgd) 116{ 117 return pgd.pgd; 118} 119 120#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) } ) 127 128static inline void page_set_storage_key(unsigned long addr, 129 unsigned char skey, int mapped) 130{ 131 if (!mapped) 132 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 133 : : "d" (skey), "a" (addr)); 134 else 135 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 136} 137 138static inline unsigned char page_get_storage_key(unsigned long addr) 139{ 140 unsigned char skey; 141 142 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 143 return skey; 144} 145 146static inline int page_reset_referenced(unsigned long addr) 147{ 148 int cc; 149 150 asm volatile( 151 " rrbe 0,%1\n" 152 " ipm %0\n" 153 " srl %0,28\n" 154 : "=d" (cc) : "a" (addr) : "cc"); 155 return cc; 156} 157 158/* 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 */ 163 164struct page; 165void arch_free_page(struct page *page, int order); 166void arch_alloc_page(struct page *page, int order); 167 168static inline int devmem_is_allowed(unsigned long pfn) 169{ 170 return 0; 171} 172 173#define HAVE_ARCH_FREE_PAGE 174#define HAVE_ARCH_ALLOC_PAGE 175 176#if IS_ENABLED(CONFIG_PGSTE) 177int arch_make_page_accessible(struct page *page); 178#define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE 179#endif 180 181#define __PAGE_OFFSET 0x0UL 182#define PAGE_OFFSET 0x0UL 183 184#define __pa_nodebug(x) ((unsigned long)(x)) 185 186#ifdef __DECOMPRESSOR 187 188#define __pa(x) __pa_nodebug(x) 189#define __pa32(x) __pa(x) 190#define __va(x) ((void *)(unsigned long)(x)) 191 192#else /* __DECOMPRESSOR */ 193 194#ifdef CONFIG_DEBUG_VIRTUAL 195 196unsigned long __phys_addr(unsigned long x, bool is_31bit); 197 198#else /* CONFIG_DEBUG_VIRTUAL */ 199 200static inline unsigned long __phys_addr(unsigned long x, bool is_31bit) 201{ 202 return __pa_nodebug(x); 203} 204 205#endif /* CONFIG_DEBUG_VIRTUAL */ 206 207#define __pa(x) __phys_addr((unsigned long)(x), false) 208#define __pa32(x) __phys_addr((unsigned long)(x), true) 209#define __va(x) ((void *)(unsigned long)(x)) 210 211#endif /* __DECOMPRESSOR */ 212 213#define phys_to_pfn(phys) ((phys) >> PAGE_SHIFT) 214#define pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT) 215 216#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) 217#define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) 218 219static inline void *pfn_to_virt(unsigned long pfn) 220{ 221 return __va(pfn_to_phys(pfn)); 222} 223 224static inline unsigned long virt_to_pfn(const void *kaddr) 225{ 226 return phys_to_pfn(__pa(kaddr)); 227} 228 229#define pfn_to_kaddr(pfn) pfn_to_virt(pfn) 230 231#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 232#define page_to_virt(page) pfn_to_virt(page_to_pfn(page)) 233 234#define virt_addr_valid(kaddr) pfn_valid(phys_to_pfn(__pa_nodebug(kaddr))) 235 236#define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 237 238#endif /* !__ASSEMBLY__ */ 239 240#include <asm-generic/memory_model.h> 241#include <asm-generic/getorder.h> 242 243#endif /* _S390_PAGE_H */ 244