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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1#ifndef _PARISC_PAGE_H
2#define _PARISC_PAGE_H
3
4#ifdef __KERNEL__
5
6#if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
7# define PAGE_SHIFT 12
8#elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
9# define PAGE_SHIFT 14
10#elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
11# define PAGE_SHIFT 16
12#else
13# error "unknown default kernel page size"
14#endif
15#define PAGE_SIZE (1UL << PAGE_SHIFT)
16#define PAGE_MASK (~(PAGE_SIZE-1))
17
18
19#ifndef __ASSEMBLY__
20
21#include <asm/types.h>
22#include <asm/cache.h>
23
24#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
25#define copy_page(to,from) copy_user_page_asm((void *)(to), (void *)(from))
26
27struct page;
28
29void copy_user_page_asm(void *to, void *from);
30void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
31 struct page *pg);
32void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
33
34/*
35 * These are used to make use of C type-checking..
36 */
37#define STRICT_MM_TYPECHECKS
38#ifdef STRICT_MM_TYPECHECKS
39typedef struct { unsigned long pte;
40#if !defined(CONFIG_64BIT)
41 unsigned long future_flags;
42 /* XXX: it's possible to remove future_flags and change BITS_PER_PTE_ENTRY
43 to 2, but then strangely the identical 32bit kernel boots on a
44 c3000(pa20), but not any longer on a 715(pa11).
45 Still investigating... HelgeD.
46 */
47#endif
48} pte_t; /* either 32 or 64bit */
49
50/* NOTE: even on 64 bits, these entries are __u32 because we allocate
51 * the pmd and pgd in ZONE_DMA (i.e. under 4GB) */
52typedef struct { __u32 pmd; } pmd_t;
53typedef struct { __u32 pgd; } pgd_t;
54typedef struct { unsigned long pgprot; } pgprot_t;
55
56#define pte_val(x) ((x).pte)
57/* These do not work lvalues, so make sure we don't use them as such. */
58#define pmd_val(x) ((x).pmd + 0)
59#define pgd_val(x) ((x).pgd + 0)
60#define pgprot_val(x) ((x).pgprot)
61
62#define __pte(x) ((pte_t) { (x) } )
63#define __pmd(x) ((pmd_t) { (x) } )
64#define __pgd(x) ((pgd_t) { (x) } )
65#define __pgprot(x) ((pgprot_t) { (x) } )
66
67#define __pmd_val_set(x,n) (x).pmd = (n)
68#define __pgd_val_set(x,n) (x).pgd = (n)
69
70#else
71/*
72 * .. while these make it easier on the compiler
73 */
74typedef unsigned long pte_t;
75typedef __u32 pmd_t;
76typedef __u32 pgd_t;
77typedef unsigned long pgprot_t;
78
79#define pte_val(x) (x)
80#define pmd_val(x) (x)
81#define pgd_val(x) (x)
82#define pgprot_val(x) (x)
83
84#define __pte(x) (x)
85#define __pmd(x) (x)
86#define __pgd(x) (x)
87#define __pgprot(x) (x)
88
89#define __pmd_val_set(x,n) (x) = (n)
90#define __pgd_val_set(x,n) (x) = (n)
91
92#endif /* STRICT_MM_TYPECHECKS */
93
94
95typedef struct __physmem_range {
96 unsigned long start_pfn;
97 unsigned long pages; /* PAGE_SIZE pages */
98} physmem_range_t;
99
100extern physmem_range_t pmem_ranges[];
101extern int npmem_ranges;
102
103#endif /* !__ASSEMBLY__ */
104
105/* WARNING: The definitions below must match exactly to sizeof(pte_t)
106 * etc
107 */
108#ifdef CONFIG_64BIT
109#define BITS_PER_PTE_ENTRY 3
110#define BITS_PER_PMD_ENTRY 2
111#define BITS_PER_PGD_ENTRY 2
112#else
113#define BITS_PER_PTE_ENTRY 3
114#define BITS_PER_PMD_ENTRY 2
115#define BITS_PER_PGD_ENTRY BITS_PER_PMD_ENTRY
116#endif
117#define PGD_ENTRY_SIZE (1UL << BITS_PER_PGD_ENTRY)
118#define PMD_ENTRY_SIZE (1UL << BITS_PER_PMD_ENTRY)
119#define PTE_ENTRY_SIZE (1UL << BITS_PER_PTE_ENTRY)
120
121/* to align the pointer to the (next) page boundary */
122#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
123
124
125#define LINUX_GATEWAY_SPACE 0
126
127/* This governs the relationship between virtual and physical addresses.
128 * If you alter it, make sure to take care of our various fixed mapping
129 * segments in fixmap.h */
130#ifdef CONFIG_64BIT
131#define __PAGE_OFFSET (0x40000000) /* 1GB */
132#else
133#define __PAGE_OFFSET (0x10000000) /* 256MB */
134#endif
135
136#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
137
138/* The size of the gateway page (we leave lots of room for expansion) */
139#define GATEWAY_PAGE_SIZE 0x4000
140
141/* The start of the actual kernel binary---used in vmlinux.lds.S
142 * Leave some space after __PAGE_OFFSET for detecting kernel null
143 * ptr derefs */
144#define KERNEL_BINARY_TEXT_START (__PAGE_OFFSET + 0x100000)
145
146/* These macros don't work for 64-bit C code -- don't allow in C at all */
147#ifdef __ASSEMBLY__
148# define PA(x) ((x)-__PAGE_OFFSET)
149# define VA(x) ((x)+__PAGE_OFFSET)
150#endif
151#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
152#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
153
154#ifndef CONFIG_DISCONTIGMEM
155#define pfn_valid(pfn) ((pfn) < max_mapnr)
156#endif /* CONFIG_DISCONTIGMEM */
157
158#ifdef CONFIG_HUGETLB_PAGE
159#define HPAGE_SHIFT 22 /* 4MB (is this fixed?) */
160#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
161#define HPAGE_MASK (~(HPAGE_SIZE - 1))
162#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
163#endif
164
165#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
166
167#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
168#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
169
170#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
171 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
172
173#include <asm-generic/memory_model.h>
174#include <asm-generic/page.h>
175
176#endif /* __KERNEL__ */
177
178#endif /* _PARISC_PAGE_H */