| 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 */ |