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Linux kernel mirror (for testing)
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1/* $Id: page.h,v 1.39 2002/02/09 19:49:31 davem Exp $ */
2
3#ifndef _SPARC64_PAGE_H
4#define _SPARC64_PAGE_H
5
6#include <linux/const.h>
7
8#if defined(CONFIG_SPARC64_PAGE_SIZE_8KB)
9#define PAGE_SHIFT 13
10#elif defined(CONFIG_SPARC64_PAGE_SIZE_64KB)
11#define PAGE_SHIFT 16
12#elif defined(CONFIG_SPARC64_PAGE_SIZE_512KB)
13#define PAGE_SHIFT 19
14#elif defined(CONFIG_SPARC64_PAGE_SIZE_4MB)
15#define PAGE_SHIFT 22
16#else
17#error No page size specified in kernel configuration
18#endif
19
20#define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT)
21#define PAGE_MASK (~(PAGE_SIZE-1))
22
23/* Flushing for D-cache alias handling is only needed if
24 * the page size is smaller than 16K.
25 */
26#if PAGE_SHIFT < 14
27#define DCACHE_ALIASING_POSSIBLE
28#endif
29
30#if defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
31#define HPAGE_SHIFT 22
32#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K)
33#define HPAGE_SHIFT 19
34#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
35#define HPAGE_SHIFT 16
36#endif
37
38#ifdef CONFIG_HUGETLB_PAGE
39#define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT)
40#define HPAGE_MASK (~(HPAGE_SIZE - 1UL))
41#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
42#define ARCH_HAS_SETCLEAR_HUGE_PTE
43#define ARCH_HAS_HUGETLB_PREFAULT_HOOK
44#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
45#endif
46
47#ifndef __ASSEMBLY__
48
49extern void _clear_page(void *page);
50#define clear_page(X) _clear_page((void *)(X))
51struct page;
52extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
53#define copy_page(X,Y) memcpy((void *)(X), (void *)(Y), PAGE_SIZE)
54extern void copy_user_page(void *to, void *from, unsigned long vaddr, struct page *topage);
55
56/* Unlike sparc32, sparc64's parameter passing API is more
57 * sane in that structures which as small enough are passed
58 * in registers instead of on the stack. Thus, setting
59 * STRICT_MM_TYPECHECKS does not generate worse code so
60 * let's enable it to get the type checking.
61 */
62
63#define STRICT_MM_TYPECHECKS
64
65#ifdef STRICT_MM_TYPECHECKS
66/* These are used to make use of C type-checking.. */
67typedef struct { unsigned long pte; } pte_t;
68typedef struct { unsigned long iopte; } iopte_t;
69typedef struct { unsigned int pmd; } pmd_t;
70typedef struct { unsigned int pgd; } pgd_t;
71typedef struct { unsigned long pgprot; } pgprot_t;
72
73#define pte_val(x) ((x).pte)
74#define iopte_val(x) ((x).iopte)
75#define pmd_val(x) ((x).pmd)
76#define pgd_val(x) ((x).pgd)
77#define pgprot_val(x) ((x).pgprot)
78
79#define __pte(x) ((pte_t) { (x) } )
80#define __iopte(x) ((iopte_t) { (x) } )
81#define __pmd(x) ((pmd_t) { (x) } )
82#define __pgd(x) ((pgd_t) { (x) } )
83#define __pgprot(x) ((pgprot_t) { (x) } )
84
85#else
86/* .. while these make it easier on the compiler */
87typedef unsigned long pte_t;
88typedef unsigned long iopte_t;
89typedef unsigned int pmd_t;
90typedef unsigned int pgd_t;
91typedef unsigned long pgprot_t;
92
93#define pte_val(x) (x)
94#define iopte_val(x) (x)
95#define pmd_val(x) (x)
96#define pgd_val(x) (x)
97#define pgprot_val(x) (x)
98
99#define __pte(x) (x)
100#define __iopte(x) (x)
101#define __pmd(x) (x)
102#define __pgd(x) (x)
103#define __pgprot(x) (x)
104
105#endif /* (STRICT_MM_TYPECHECKS) */
106
107typedef struct page *pgtable_t;
108
109#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_32BIT) ? \
110 (_AC(0x0000000070000000,UL)) : \
111 (_AC(0xfffff80000000000,UL) + (1UL << 32UL)))
112
113#include <asm-generic/memory_model.h>
114
115#endif /* !(__ASSEMBLY__) */
116
117/* to align the pointer to the (next) page boundary */
118#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
119
120/* We used to stick this into a hard-coded global register (%g4)
121 * but that does not make sense anymore.
122 */
123#define PAGE_OFFSET _AC(0xFFFFF80000000000,UL)
124
125#ifndef __ASSEMBLY__
126
127#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
128#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
129
130#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
131
132#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr)>>PAGE_SHIFT)
133
134#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
135
136#define virt_to_phys __pa
137#define phys_to_virt __va
138
139#endif /* !(__ASSEMBLY__) */
140
141#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
142 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
143
144#include <asm-generic/page.h>
145
146#endif /* _SPARC64_PAGE_H */