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
33static 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 */
47static 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
70typedef struct { unsigned long pgprot; } pgprot_t;
71typedef struct { unsigned long pgste; } pgste_t;
72typedef struct { unsigned long pte; } pte_t;
73typedef struct { unsigned long pmd; } pmd_t;
74typedef struct { unsigned long pud; } pud_t;
75typedef struct { unsigned long pgd; } pgd_t;
76typedef 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
92static 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
102static 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
110static 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
127struct page;
128void arch_free_page(struct page *page, int order);
129void arch_alloc_page(struct page *page, int order);
130void arch_set_page_states(int make_stable);
131
132static 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