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
storage_key_init_range(unsigned long start,unsigned long end)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 */
copy_page(void * to,void * from)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
page_set_storage_key(unsigned long addr,unsigned char skey,int mapped)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
page_get_storage_key(unsigned long addr)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
page_reset_referenced(unsigned long addr)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
devmem_is_allowed(unsigned long pfn)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