1 /* 2 * S390 version 3 * Copyright IBM Corp. 1999, 2000 4 * Author(s): Hartmut Penner (hp@de.ibm.com) 5 */ 6 7 #ifndef _S390_PAGE_H 8 #define _S390_PAGE_H 9 10 #include <linux/const.h> 11 #include <asm/types.h> 12 13 /* PAGE_SHIFT determines the page size */ 14 #define PAGE_SHIFT 12 15 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) 16 #define PAGE_MASK (~(PAGE_SIZE-1)) 17 #define PAGE_DEFAULT_ACC 0 18 #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4) 19 20 #define HPAGE_SHIFT 20 21 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 22 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 23 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 24 25 #define ARCH_HAS_SETCLEAR_HUGE_PTE 26 #define ARCH_HAS_HUGE_PTE_TYPE 27 #define ARCH_HAS_PREPARE_HUGEPAGE 28 #define ARCH_HAS_HUGEPAGE_CLEAR_FLUSH 29 30 #include <asm/setup.h> 31 #ifndef __ASSEMBLY__ 32 33 static inline void storage_key_init_range(unsigned long start, unsigned long end) 34 { 35 #if PAGE_DEFAULT_KEY 36 __storage_key_init_range(start, end); 37 #endif 38 } 39 40 #define clear_page(page) memset((page), 0, PAGE_SIZE) 41 42 /* 43 * copy_page uses the mvcl instruction with 0xb0 padding byte in order to 44 * bypass caches when copying a page. Especially when copying huge pages 45 * this keeps L1 and L2 data caches alive. 46 */ 47 static inline void copy_page(void *to, void *from) 48 { 49 register void *reg2 asm ("2") = to; 50 register unsigned long reg3 asm ("3") = 0x1000; 51 register void *reg4 asm ("4") = from; 52 register unsigned long reg5 asm ("5") = 0xb0001000; 53 asm volatile( 54 " mvcl 2,4" 55 : "+d" (reg2), "+d" (reg3), "+d" (reg4), "+d" (reg5) 56 : : "memory", "cc"); 57 } 58 59 #define clear_user_page(page, vaddr, pg) clear_page(page) 60 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 61 62 #define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \ 63 alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr) 64 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE 65 66 /* 67 * These are used to make use of C type-checking.. 68 */ 69 70 typedef struct { unsigned long pgprot; } pgprot_t; 71 typedef struct { unsigned long pgste; } pgste_t; 72 typedef struct { unsigned long pte; } pte_t; 73 typedef struct { unsigned long pmd; } pmd_t; 74 typedef struct { unsigned long pud; } pud_t; 75 typedef struct { unsigned long pgd; } pgd_t; 76 typedef pte_t *pgtable_t; 77 78 #define pgprot_val(x) ((x).pgprot) 79 #define pgste_val(x) ((x).pgste) 80 #define pte_val(x) ((x).pte) 81 #define pmd_val(x) ((x).pmd) 82 #define pud_val(x) ((x).pud) 83 #define pgd_val(x) ((x).pgd) 84 85 #define __pgste(x) ((pgste_t) { (x) } ) 86 #define __pte(x) ((pte_t) { (x) } ) 87 #define __pmd(x) ((pmd_t) { (x) } ) 88 #define __pud(x) ((pud_t) { (x) } ) 89 #define __pgd(x) ((pgd_t) { (x) } ) 90 #define __pgprot(x) ((pgprot_t) { (x) } ) 91 92 static inline void page_set_storage_key(unsigned long addr, 93 unsigned char skey, int mapped) 94 { 95 if (!mapped) 96 asm volatile(".insn rrf,0xb22b0000,%0,%1,8,0" 97 : : "d" (skey), "a" (addr)); 98 else 99 asm volatile("sske %0,%1" : : "d" (skey), "a" (addr)); 100 } 101 102 static inline unsigned char page_get_storage_key(unsigned long addr) 103 { 104 unsigned char skey; 105 106 asm volatile("iske %0,%1" : "=d" (skey) : "a" (addr)); 107 return skey; 108 } 109 110 static inline int page_reset_referenced(unsigned long addr) 111 { 112 unsigned int ipm; 113 114 asm volatile( 115 " rrbe 0,%1\n" 116 " ipm %0\n" 117 : "=d" (ipm) : "a" (addr) : "cc"); 118 return !!(ipm & 0x20000000); 119 } 120 121 /* Bits int the storage key */ 122 #define _PAGE_CHANGED 0x02 /* HW changed bit */ 123 #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ 124 #define _PAGE_FP_BIT 0x08 /* HW fetch protection bit */ 125 #define _PAGE_ACC_BITS 0xf0 /* HW access control bits */ 126 127 struct page; 128 void arch_free_page(struct page *page, int order); 129 void arch_alloc_page(struct page *page, int order); 130 void arch_set_page_states(int make_stable); 131 132 static inline int devmem_is_allowed(unsigned long pfn) 133 { 134 return 0; 135 } 136 137 #define HAVE_ARCH_FREE_PAGE 138 #define HAVE_ARCH_ALLOC_PAGE 139 140 #endif /* !__ASSEMBLY__ */ 141 142 #define __PAGE_OFFSET 0x0UL 143 #define PAGE_OFFSET 0x0UL 144 #define __pa(x) (unsigned long)(x) 145 #define __va(x) (void *)(unsigned long)(x) 146 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 147 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 148 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 149 150 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 151 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 152 153 #include <asm-generic/memory_model.h> 154 #include <asm-generic/getorder.h> 155 156 #endif /* _S390_PAGE_H */ 157